Uniden Two Way Radio MHS550 User Manual
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Table of Contents  
Maritime Radio Services Operation.............................................2  
FCC/Industry Canada Information ...............................................ꢀ  
A Quick Start Guide for the MHS550 ...........................................6  
Marine Band..............................................................................6  
FRS Band..................................................................................7  
Weather Band ...........................................................................8  
AM Band ...................................................................................8  
FM Band....................................................................................9  
Aircraft Band .............................................................................9  
Scanning Introduction ............................................................... 10  
Normal.................................................................................... 10  
TripleWatch ............................................................................ 11  
FCC RF Exposure Information .................................................. 1ꢀ  
Lithium Ion Battery Pack Warning............................................ 13  
What’s Included.......................................................................... 14  
Introduction................................................................................. 15  
Features........................................................................................15  
MHS550 Controls........................................................................ 17  
Radio Charger Cradle................................................................. ꢀ0  
LCD Displays .............................................................................. ꢀ1  
VHF Marine Band................................................................... ꢀ1  
Family Radio Service (FRS) Band ......................................... ꢀ1  
AM Band ................................................................................ ꢀ1  
FM Band................................................................................. ꢀꢀ  
Aircraft Band .......................................................................... ꢀꢀ  
Indicator Meanings......................................................................ꢀꢀ  
Owner’s Manual Conventions....................................................ꢀ3  
Indicator Sounds .........................................................................ꢀ4  
Batteries .......................................................................................ꢀ4  
Installing the Lithium Ion Battery Pack....................................ꢀ5  
Uniden MHS550 Radio Owner’s Manual  
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Using the Alkaline Battery Pack ..............................................ꢀ5  
Battery Life and Indication......................................................ꢀ6  
Alkaline Batteries and Radio Performance .............................ꢀ7  
Mounting the Charging Cradle...................................................ꢀ7  
To Mount the Cradle on a Counter Top ...................................ꢀ7  
Mounting on a Wall .................................................................ꢀ7  
Attaching the Belt Clip................................................................ꢀ8  
Basic Operation, Controls, and Settup Options.......................ꢀ9  
Operation - Marine and Weather Bands ....................................ꢀ9  
Selecting a Channel................................................................30  
Setting the Transmitting Power Level......................................30  
Transmitting.............................................................................31  
Operation - Family Radio Service Band....................................3ꢀ  
Operation - AM Band..................................................................3ꢀ  
Operation - FM Band ...................................................................33  
Operation - Aircraft Band............................................................33  
Using the Radio Menu Options ..................................................34  
Accessing the Menus..................................................................35  
USA/CAN/INT (U.I.C.).............................................................35  
Lamp (Backlight) Adjust ..........................................................36  
Adjusting Display Contrast......................................................37  
Setting Dual or TripleWatch (Tri Watch)..................................37  
Setting the Key Beep ..............................................................38  
Adding FIPS Codes.................................................................38  
Changing Channel Names......................................................40  
Restoring Default Names........................................................40  
Setting CTCSS Codes ............................................................41  
Setting Frequency Steps.........................................................43  
AM Band..............................................................................43  
FM Band..............................................................................43  
Setting FM Muting...................................................................44  
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Uniden MHS550 Radio Owner’s Manual  
Other Options ..............................................................................44  
Setting the Key Lock ...............................................................44  
Manually Selecting  
Coast Guard/Distress/Hailing Channels..................................45  
Storing a Channel or Frequency in Memory ...........................46  
Selecting and Using the  
Weather Channel and Weather Alert (WX/ALERT) ...................47  
Using the TripleWatch or DualWatch Mode ............................48  
Scanning - the Basics and Beyond............................................49  
Normal Scanning.....................................................................51  
TripleWatch and DualWatch Scanning....................................5ꢀ  
Both Watches and Weather Channel......................................53  
Scanning (Memory Preset Station Tuning) in the  
AM, FM, and Aircraft Bands ....................................................54  
Examples of Mode Applications ................................................55  
Accessory Options - Using the External  
Speaker/Mic Jack ..................................................................55  
Care and Maintenance ................................................................56  
Troubleshooting ..........................................................................56  
Reference Section.......................................................................58  
Specifications........................................................................58  
USA Channel Frequencies ..................................................60  
Canadian Channel Frequencies..........................................6ꢀ  
International Channel Frequencies ....................................64  
NOAA Channels and Frequencies.......................................66  
FRS Channels and Frequencies ..........................................66  
CTCSS Channels and Frequencies .....................................66  
DCS Codes.............................................................................66  
Three Year Limited Warranty......................................................67  
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A Quick Start Guide for the MHS550  
Follow these steps to get going!  
Marine Band  
1. Rotate VOLUME until the display lights. The Power  
On tone sounds. The default display starts with the  
VHF Marine Band and displays USA Channel 16, at a  
5 watt power level, and DISTRESS is displayed in the  
LCD message line area.  
ꢀ. Press ▲ or ▼ to change channels. The marine  
channels begin with 01 in Canada and 01A in the  
USA, and continue in a closed loop, through 88A in  
the USA and 88 in Canada.  
06 Safety  
05A VTS/Com  
03A CG Only  
01A VTS/Com  
88A Commerc  
88 Mar Opr  
87 Mar Opr  
A
Memory  
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Uniden MHS550 Radio Owner’s Manual  
3. Before you transmit, press and hold BAND/1/2.5/5W  
to select a power level. Then press ▲ or ▼ to select  
a channel.  
4. Press PTT (the Push To Talk button) on the side of  
the radio to transmit. Release to stop transmitting.  
BAND  
To change bands, follow these steps.  
FRS Band  
1. Briefly press BAND/1/2.5/5W. The radio changes to  
the FRS Band.  
ꢀ. Use ▲ or ▼ to select one of the 14 FRS channels.  
3. You can choose to leave the CTCSS coding disabled  
(default) in which case OFF appears to the right of the  
channel selected. Or, you can press MENU to select  
and activate a CTCSS code for the chosen channel.  
See Using the Menu options for the FRS Band on  
Page 35.  
Note: Selecting and assigning one of the 142 Privacy  
Codes (CTCSS/DCS) to the operating FRS channel  
lets you and another radio communicate without  
interference from others in your area who might being  
using the identical FRS channel. Without enabling the  
CTCSS code feature, you and others in your group  
might also hear everyone else in the area on that  
same channel.  
Uniden MHS550 Radio Owner’s Manual  
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4. To transmit, press PTT. TRANSMITTING appears in  
the message line of the LCD screen.  
Note: Do not press PTT and turn on power at the  
same time. The radio sounds the PTT error tone and  
RELEASE PTT appears in the LCD message line.  
See Page 35 to select various menu options for this  
band using the FRS MENU screen.  
Weather Band  
1. Press WX/ALERT to  
switch to the weather  
channels. Ten channels  
are designated as  
weather channels.  
All carry the same  
information. One  
will provide the best  
reception for your particular area.  
ꢀ. Use ▲ or ▼ to cycle through the ten channels until  
you locate the one with the best reception.  
3. Press WX/ALERT again to return to the band in use  
prior to switching to the weather channels.  
AM Band  
1. Briefly press BAND/  
1/2.5/5W to change  
to the AM Broadcast  
band. The default LCD  
screen shows the  
frequency, the USA  
frequency step setting  
and the power level  
icon.  
2. Press either ▲ or ▼ to change frequency by 10KHz  
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Uniden MHS550 Radio Owner’s Manual  
(500, 510, 5ꢀ0 KHz, etc) until you reach the desired  
station. In Europe, the step is 9kHz.  
Note: See Page 35 to select various menu options for  
this band using the AM MENU screen.  
FM Band  
1. Briefly press BAND/1/  
2.5/5W to change to the  
FM Broadcast band.  
The default LCD screen  
shows the frequency,  
the USA frequency step  
setting and the power  
level icon.  
ꢀ. Press either ▲ or ▼ to change frequency by 200KHz  
(87.9, 88.1, 88.3 MHz etc) until you reach the desired  
station.  
Note: See Page 35 to select various menu options for  
this band using the FM MENU screen.  
Aircraft Band  
1. Briefly press BAND/1/  
2.5/5W to change to the  
Aircraft (commercial)  
band. The default LCD  
screen shows the  
frequency, and the power  
level icon.  
ꢀ. Press either ▲ or ▼ to change frequency by 25KHz  
(108.00, 108.0ꢀ5, 108.050 MHz etc) until you reach  
the desired frequency.  
Uniden MHS550 Radio Owner’s Manual  
9
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Scanning Introduction  
There are three types of VHF marine scanning choices  
that you can select: Normal, DualWatch, and TripleWatch.  
Normal and TripleWatch scanning are described below. For  
additional details regarding the various scanning modes, see  
Page 49.  
Normal  
Normal Scanning lets you scan all the channels you store  
in memory. This means the radio checks each channel in  
memory then moves to the next channel if no activity is  
found. If activity is found, the radio stops so you can monitor  
the channel.  
To activate Normal Scan mode, momentarily press SCAN/  
MEM. The radio scans all the channels stored in memory  
from lowest to highest. The display shows CHANNEL SCAN  
in the VHF marine band at the bottom. For the other bands,  
the Scan icon appears in the display.  
CH 07A  
CH 08  
CH 10  
CH 21A  
CH 22A  
CH 64A  
CH 79A  
CH 80A  
Channel Scan of 8 Channels Stored in Memory  
When you scan those channels, each channel is checked in  
order and the scan sequence repeats until you interrupt it.  
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Uniden MHS550 Radio Owner’s Manual  
TripleWatch  
Using the MARINE MENU option choices (see Page 35),  
you can choose to have the radio monitor a working channel  
(in this example, Channel ꢀ5,) and Channel 16, the safety  
and hailing channel, and Channel 9, the backup hailing, and  
calling channel. Although this feature is called TripleWatch,  
the LCD only shows TRIWATCH due to character count  
limitations.  
When you press and hold 16/9/TRI, the radio monitors  
2 sec  
25  
09  
immediate  
immediate  
16  
TripleWatch of Marine Ch. 25,  
according to the sequence shown. In the illustration, the  
radio is set to marine Channel 25 (the working channel) and  
TripleWatch has been selected from the MARINE MENU.  
To learn about details dealing with General Setup, Battery  
Operation and Charging, Menu Options, Storing Channels,  
Scanning Channels as well as Memorized Station Preset  
operations for the other bands, in addition to using the  
special features of either Triple or DualWatch, consult the  
Table of Contents which immediately precedes these Quick  
Start pages.  
Uniden MHS550 Radio Owner’s Manual  
11  
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FCC RF Exposure Information  
WARNING! Read this information before using the radio  
In August 1996 the Federal Communications Commission  
(FCC) of the United States with its action in Report and  
Order FCC 96-3ꢀ6 adopted an updated safety standard for  
human exposure to radio frequency electromagnetic energy  
emitted by FCC regulated transmitters. Those guidelines  
are consistent with the safety standard previously set by  
both U.S. and international standards bodies. The design  
of the radio complies with the FCC guidelines and these  
international standards.  
Never allow children to operate the radio without adult  
supervision and the knowledge of the following guidelines.  
WARNING! It is up to the user to properly operate this radio  
transmitter to insure safe operation. Please adhere to the  
following:  
Use only the supplied or an approved antenna. Unauthorized  
antennas, modifications, or attachments could impair call  
quality, damage the radio, or result in violation of FCC  
regulations.  
Do not use the radio with a damaged antenna. If a damaged  
antenna comes into contact with the skin, a minor burn may  
result. Please contact your local dealer for a replacement  
antenna.  
Body-worn Operation — This device was tested for  
typical body-worn operations using the supplied belt-clip. To  
maintain compliance with FCC RF exposure requirements,  
body-worn operations are restricted to the supplied belt-  
clip. For hand-held operation, the radio should be held 1  
inch from the user’s face. The use of accessories that do  
not satisfy these requirements may not comply with FCC RF  
exposure requirements and should be avoided. For more  
information about RF exposure, please visit the FCC website  
at www.fcc.gov  
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1ꢀ  
Uniden MHS550 Radio Owner’s Manual  
Lithium Ion Battery Pack Warning  
This equipment contains a rechargeable Lithium Ion battery.  
The rechargeable Lithium Ion battery contained in this  
equipment may explode if disposed of in a fire.  
Do not short-circuit the Battery Pack.  
Do not charge the rechargeable Lithium Ion battery used in  
this equipment in any charger other than the one designed  
to charge this battery as specified in the owner’s manual.  
Using another charger may damage the battery or cause the  
Battery Pack to explode.  
Lithium Ion batteries must be recycled or disposed of  
properly.  
Avoid exposing the Lithium Ion battery, attached or  
unattached to the radio, in direct sunlight, heated cars, or in  
areas with temperatures below -4°F (-ꢀ0°C) or above +140°F  
(+60°C). Exposing the chemical contained within the battery  
pack to temperatures above +140°F (+60°C) may cause the  
battery to rupture, fail, or reduce performance.  
In case of exposure to the cell contents, wash the affected  
area thoroughly, and seek medical attention.  
Uniden MHS550 Radio Owner’s Manual  
13  
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What’s Included  
AC550  
RSC550  
AC Adapter  
Charging Cradle  
BP550  
DC550  
MHS550 Radio  
DC Adapter  
Lithium Ion  
Battery Pack  
BT550  
CLIP550  
Belt Clip  
Mounting  
Hardware  
Alkaline Battery Case  
(batteries not included)  
WNERS  
O
AL  
U
MAN  
Accessory ID  
numbers such as  
CLIP550  
are provided to help you  
order replacements  
should that be neccessary.  
Owners Manuals and  
Other Printed Materials  
Wrist Strap  
If any of these items are missing from the box, contact  
Uniden or call 1-800-554-3988.  
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14  
Uniden MHS550 Radio Owner’s Manual  
Introduction  
Your Uniden MHS550 represents the latest in marine radio  
technology in a conveniently sized and rugged package. It  
has features you’ll come to count on for day in and day out  
use. The product combines size, value, and fully featured  
performance that makes it a good choice for an all around  
marine communications radio.  
Features  
The MHS550 brings the following key features to make  
marine radio useful and easy:  
Complete Marine VHF channels (USA-1A to 88A) for  
the U.S., Canada, and International waters — let you  
communicate with standard marine radio operators.  
National Oceanic and Atmospheric Administration  
(NOAA) Weather channels — let you listen to the local  
weather conditions and be forewarned of dangerous  
conditons.  
NOAA Weather Alert — provides a siren tone warning of a  
serious impending weather event and emergency weather  
warnings, broadcast by NOAA.  
Emergency CH 16 (Coast Guard/Distress Hailing) and  
CH9 (Calling/Hail Secondary) operation  
Family Radio Service Band (FRS) with CTCSS/DSC  
(Continuous Tone Coded Squelch System/Digital  
Squelch Control) Privacy encoding — Provides you with  
ꢀ-way communication using 14 channels plus Privacy Codes  
to help interference from nearby FRS units.  
Standard AM Broadcast Band (500-1800 KHz) —Lets  
you listen to news, music, sports, and other programming.  
enjoyment anywhere.  
Uniden MHS550 Radio Owner’s Manual  
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Standard FM Broadcast Band (87.5-108 MHz) — Lets you  
enjoy your favorite broadcast programming.  
Aircraft Broadcast Reception (108-137MHz) — Lets you  
listen in on aircraft to ground transmissions.  
Triple and DualWatch Operation — In TripleWatch  
operation, the radio monitors the working channel, then 2-  
seconds later, the Coast Guard/Distress/Hailing Channel 16  
then in another 2-seconds, Channel 9, the backup channel.  
In DualWatch, the radio monitors the channel in use (marine  
or weather) then ꢀ-seconds later, Channel 16.  
Normal Scan — with two or more channels or frequencies  
stored in memory, the radio either checks those channels in  
rapid succession or lets you use the frequencies as Station  
Presets. This also applies to Dual or TripleWatch mode.  
Transmitter Power Level Select — lets you select an  
output power settings of 1, ꢀ.5, and 5 watts except for certain  
restricted channels.  
Channel Select Keys — let you easily navigate up and  
down the channel list to the desired channel. They also let  
you quickly choose all desired Radio Menu options.  
Submersible — The radio is JIS7 compliant. This means it  
remains watertight if submerged in 1 meter of water for 30  
minutes.  
Battery Power Level Display and Tone — clearly indicates  
five levels of battery power. Sounds an alert tone when  
battery power reaches a level before shutting down.  
Battery Save — during specific transmit operations, the  
radio powers down to extend battery life.  
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Uniden MHS550 Radio Owner’s Manual  
MHS550 Controls  
13  
14  
15 16  
3
4
1
2
5
12  
6
7
8
9
10  
11  
19  
13  
4
1
2
3
17  
18  
17  
17  
Uniden MHS550 Radio Owner’s Manual  
17  
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1. Antenna —Flexible for convenience. Heavy duty covering  
to ensure long-term endurance.  
2. Watertight Ext. Speaker/Mic Jack — Unscrew the  
cap and insert an approved mic/speaker for convenient  
operation.  
3. Volume-Power ON/OFF Control - Rotate to turn on  
power and set volume to a comfortable listening level.  
4. Squelch Control — Rotate clockwise to hear strong  
signals without noise or static and weak signals with a  
minimum level of noise..  
5. Wrist Strap Anchor — Thread and loop the supplied wrist  
strap to conveniently carry the radio.  
6. WX/ALERT — Press briefly to change the mode to  
Weather Channel reception. Press and hold to activate the  
Weather Alert feature.  
7. SCAN/MEM — Press to set Normal Channel Scan on or  
off. Press and hold to store or remove the current channel  
into and out of memory.  
8. BAND/1/2.5/5W — Press briefly to change bands.  
Press and hold to select the output power unless fixed by  
regulations.  
9. 16/9/TRI — Press briefly to switch to the Coast Guard/  
Distress/Hailing Channel 16 or the secondary Calling Hailing  
Channel 9. Press and hold to enable TripleWatch or Dual  
Watch monitoring.  
10. MENU — Press to display the user-settable menu  
options.  
11. ENTER — Press to select or store a chosen menu  
option.  
12. ▲ and ▼ — Press to select channels above or below your  
currently selected channel. Press and hold to change channels  
rapidly. Press to scroll through a band’s menu selections.  
13. BeltClip—Squeeze and attach to your belt  
for convenient carrying.  
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Uniden MHS550 Radio Owner’s Manual  
14. PTT — Press to transmit.  
15. Key Lock ON/OFF — lets you lock the keypad to  
prevent accidental changes while powered on. The feature  
becomes unlocked when powered off and on again. You  
can also quickly disable the feature by pressing and holding  
down this key.  
16. Backlight — Press briefly to activate the Backlight.  
17. Battery Connection Area and Battery Recharging  
Contacts— Install the supplied Lithium Ion Rechargeable  
Battery being sure to position the pack as shown in the  
section Batteries. To recharge the installed Lithium Ion  
battery, place the MHS550 into the Charger Cradle. The  
contacts at the bottom edge of the radio receive the required  
voltage and current from the cradle to completely recharge  
the battery in about 4 hours.  
18. Battery Latch — Lift the latch to remove and replace the  
Lithium-Ion battery or to install the Alkaline Battery case.  
19. MIC — Speak clearly into the microphone aperture when  
transmitting for best results. Position the microphone at least  
4 inches from your mouth.  
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Radio Charger Cradle  
22  
21  
20  
20. Front Charging Indicator — Lights during battery  
charging and goes off when the battery is fully charged. If a  
fully charged battery is placed in the cradle, the LED does  
not light and no charging takes place. While you can monitor  
incoming calls while the radio is in the charger, do not  
attempt to transmit while it is in the cradle.  
21. DC Input Jack — Connect the AC adapter then plug the  
adapter into a standard 1ꢀ0/ꢀ40V AC outlet. The DC adapter  
connects to a vessel’s 12V socket and this jack.  
22. Charging Latch — Holds the radio in place when you in-  
sert it into the cradle.  
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Uniden MHS550 Radio Owner’s Manual  
LCD Displays  
The LCD screen for each band displays the information spe-  
cific for that band. Some indications are common to all six  
bands. Some screens are condition specific such as a Low  
Battery situation.  
VHF Marine Band  
4
1
2
3
Memory  
1A  
Alert  
5
7
Family Radio Service (FRS) Band  
1A  
1
11  
Locked  
8
4
Memory  
9
Dual Watch  
Scan  
7
6
AM Band  
1A  
10  
1
8
Locked  
Memory  
Scan  
9
4
6
Uniden MHS550 Radio Owner’s Manual  
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FM Band  
1A  
1
10  
9
8
4
Mute on  
Scan  
Locked  
Memory  
6
12  
Aircraft Band  
1
1A  
8
4
Locked  
Memory  
Scan  
6
9
Indicator Meanings  
1
Band Indication  
— shows which of the 6 bands is  
currently selected (VHF, Weather (WX/ALERT), FRS, FM,  
AM, and Aircraft)  
CHANNEL or Frequency  
— shows the currently  
1A  
selected channel number. See the USA, Canadian, and  
International channel charts in the back of this manual or for  
AM, FM, and Air, the frequency selected.  
1 Watt or 2.5 Watts or 5 Watts  
— indicates present  
2
transmit power. Not displayed when receiving weather  
frequencies. Not displayed for those channels on which  
transmitting is prohibited. The initial setting is 5W.  
USA or INT or CAN (UIC)  
band in use for marine operation.  
— indicates the frequency  
3
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ꢀꢀ  
Uniden MHS550 Radio Owner’s Manual  
Memory  
stored in memory.  
— displayed when the radio displays a channel  
4
5
Alert  
Scan  
— displays when weather alert is enabled.  
— displays when you enable scanning.  
6
7
TRIWATCH or DUALWATCH  
— displayed in the VHF  
Message Line when either mode is active. Displayed  
independently in the FRS band.  
8
Locked  
— displayed when the keypad is locked.  
— displays one of five different  
Battery Level Icon  
indicators to show the battery power level.  
9
Frequency Step Indication (USA/Europe)  
— shows  
10  
the selection of the value of the frequency step between  
channels in AM or FM mode.  
Message Line  
— depending on the current band or the  
7
selected radio mode, this line can show you the Channel  
Name (for the marine band), the MENU options (Setup  
Options), or other data specific to the chosen band.  
11  
CTCSS Option  
— Displays OFF when not enabled.  
Displays a code number when enabled for the associated  
channel.  
12  
Muting On  
— appears when you select Muting from the  
FM Band option menu. Disappears when you disengage  
muting from the menu.  
Owner’s Manual Conventions  
To indicate a key, button, knob or other physical control, we  
print the label in BOLD UPPER CASE. To indicate an LCD  
(display) label, option, or selection, we use UPPER or Lower  
Case italic labels such as MENU, 5 Seconds, Channel 06.  
Occasionally we indicate an option as (default). This means  
that the option is set in the manner indicated at the factory  
and is the setting when you first apply power. If you choose  
not to alter it, the default is the setting used by the radio.  
Uniden MHS550 Radio Owner’s Manual  
ꢀ3  
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Indicator Sounds  
The radio sounds several tones designed to convey  
important information. Become familiar with them to use the  
radio more effectively.  
Power On — a rapidly rising tone sounds to confirm that  
power is applied.  
Keypad Touch Single Tone — sounds to confirm you have  
pressed a single key  
Keypad Touch Double Tone — sounds to confirm you  
pressed and held down a key for 2 seconds.  
Error Tone — sounds to indicate an invalid key press or op-  
eration.  
PTT Error Tone — sounds to indicate an invalid press of the  
PTT switch.  
WX ALERT Tone — a rising and falling tone sounds when a  
weather alert is received and decoded.  
SAME Tone — sounds a confirmation tone when entering a  
FIPS code.  
PTT Time Out Tone (PTT Error Tone) — sounds when  
your continuous transmitting time exceeds 5 minutes. Also  
sounds if you attempt to transmit with low power battery. If  
the battery icon continues to blink once you stop pressing the  
PTT key, you must recharge/replace the currently installed  
battery(s)  
Batteries  
Your Uniden MHS550 comes equipped with a Lithium Ion  
battery which snaps into the back of the radio and secures  
with a latch. The battery has a minimal charge when shipped.  
Before use, place the radio in the Charging Cradle and  
charge the battery for four hours. Note that unlike some other  
types of rechargeable batteries, a Lithium Ion battery can be  
“topped-off” as needed with no degradation of performance.  
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ꢀ4  
Uniden MHS550 Radio Owner’s Manual  
Installing the Lithium Ion Battery Pack  
1. To install the Lithium Ion Battery Pack, insert the  
upper contacts on the lower edge of the battery area  
on the radio back as shown in the first illustration.  
ꢀ. Lower the pack until it is flat in the chamber  
3. Bring the locking latch up and lock it into place to  
secure the pack.  
Insert Battery  
Close and Lock Latch  
Using the Alkaline Battery Pack  
The radio is supplied with a battery pack that can hold four  
AAA type alkaline batteries (not supplied). For longest useful  
life we suggest using an extra strength battery such as  
®
Duracell Ultra batteries.  
Note: When powering the radio by alkaline batteries,  
transmit power is limited to a maximum of ꢀ.5 watts.  
To install the four AAA batteries in the alkaline battery pack,  
refer to the following steps and illustrations.  
1. Hold the lower part of the pack and with the other  
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hand, lift the cover to reveal the contacts in the  
chamber. Note the polarity markings.  
ꢀ. Position the alkaline batteries according to the and  
terminals and snap each into place.  
3. Close the cover as shown.  
Using alkaline batteries let you continue to use the radio  
until you have an opportunity to fully recharge your primary  
Lithium Ion Battery pack. Be sure to dispose of the alkaline  
batteries properly according to their package information.  
Warning - although the design of the case prevents  
accidental charging of installed alkaline batteries, for safety,  
never attempt to recharge alkaline batteries by defeating the  
case design or recharging outside of the case.  
Battery Life and Indication  
The operational power level of the Lithium-Ion battery pack  
or the alkaline battery pack is common to use by each  
band. It is important to recognize when the Lithium-Ion pack  
needs recharging or when you must replace all the alkaline  
batteries.  
On each band LCD screen you see one of the following  
battery power level icons displayed.  
Full  
Power  
Recharge/  
Replace  
If a level 0 condition occurs, the battery icon flashes, a  
‘battery low’ tone sounds repeatedly each second, and  
BATTERY LOW appears on the message line.  
To cancel this warning, press any key. The flashing icon  
continues until you turn off the radio. The message and tone,  
however, disappear.  
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Uniden MHS550 Radio Owner’s Manual  
Note: During the time you press PTT to transmit, you may  
notice the power level indicator drop to a lower level and  
then return to a higher level once you stop transmitting.  
This is normal and merely indicates that additional power is  
required to transmit compared to that used during reception.  
Alkaline Batteries and Radio Performance  
If you use alkaline batteries for emergency purposes, note  
that the transmitting power output may suffer as the alkaline  
batteries become weak and near the end of their useful life.  
In such cases, you might not be able to transmit with a full  
2.5 watts of power. Replace the batteries with known fresh  
batteries to be sure, or switch to a fully charged Lithium Ion  
battery pack.  
When the  
appears (Low Battery), or you hear the  
Low Battery alert tone sound, be sure to replace all alkaline  
batteries in use. Doing so removes any chance of degraded  
radio performance and operation that can occur toward the  
end of the batteries’ useful life.  
Mounting the Charging Cradle  
Your MHS550 Li-Ion battery may not be fully charged when  
you first turn on the radio. To facilitate convenient charging  
we suggest mounting the charger cradle to either a counter  
top or wall. Use the AC Adapter at home and the DC Adapter  
on your boat or car.  
To Mount the Cradle on a Counter Top  
Locate the three holes provided in the flange surrounding  
the cradle. Using the holes as a template, mark the surface.  
Center punch and drill three holes to accommodate the  
provided screws and washers.  
Mounting on a Wall  
Using the keyholes in the rear of the cradle as a template,  
confirm that the area on the wall has solid backing such as  
a wooden beam. Then drill holes and use the screws and  
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washers provided. Otherwise, select mounting hardware (not  
supplied) that is appropriate for the mounting material.  
On Counter Top  
Attach to Wall  
Lock Down  
Attaching the Belt Clip  
To conveniently carry the radio, attach the provided belt clip  
as follows.  
• Align the clip mounting hole with the mounting post  
as shown. Place the clip on the post and slide it in the  
direction of the arrow until you hear a click.  
• To remove the clip, rotate the clip so the indentation  
is toward the bottom of the radio. Move the clip in the  
direction of the arrow and lift it off the post.  
OL  
V
OL  
V
SQ  
SQ  
Step One  
Step Two  
Attach  
OL  
V
OL  
V
SQ  
SQ  
Step One  
Step Two  
Remove  
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Uniden MHS550 Radio Owner’s Manual  
Basic Operation, Controls,  
and Settup Options  
Each band has settings that are specific to that band and  
certain controls as well. To start using your MHS550, find the  
desired band and follow the steps in the section.  
Operation - Marine and Weather Bands  
1. Rotate VOLUME until  
the display lights and the  
Power On tone sounds.  
The Uniden splash  
screen appears followed  
by the normal channel  
screen.  
ꢀ. Set the volume to  
a comfortable listening level. The display shows  
Channel 16 (default) in the US marine band, a 5-watt  
level and DISTRESS appears on the message line  
space at the bottom edge of the screen.  
3. Press ▲ or ▼ to change channels. The marine  
channels begin at 01 and continue, in a closed loop,  
through 88A. Using either key you can manually  
select a channel to use. To cycle rapidly through the  
channels, press and hold either ▲ or ▼ for about  
one-half second.  
4. Press WX/ALERT to switch to the weather channels.  
Ten channels are designated as weather channels. All  
carry the same  
information. One will  
provide the best  
reception for your  
particular area.  
5. Use ▲ or ▼ to cycle  
through the ten channels  
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until you locate the one with the best reception.  
6. Press WX/ALERT to return to marine Channels 1 to  
88A.  
Selecting a Channel  
1. To receive marine transmissions and transmit signals,  
select a working channel. When you first apply power,  
the screen displays the default band (Marine USA),  
the default power setting (5 Watts), and the battery  
power level icon.  
ꢀ. To change the channel, press ▲ or ▼. The default  
channel names appear next to the channel numbers  
along the left border of the screen. To change  
(personalize) the channel names, see Page 40.  
Setting the Transmitting Power Level  
You can select the transmitting power for all channels except  
those designated as Receive Only or Low Power Channels  
(see the Status column of the Frequency Charts for more  
details).  
Repeatedly press and hold BAND/1/2.5/5W for about 3  
seconds. Each time you press the key, the power output  
level changes and the corresponding icon appears on the  
display. A rapid double beep sounds to confirm the change.  
Note: for those channels designated as 1W maximum, even  
though you have set the power level to either ꢀ.5 or 5W,  
1W is displayed and used. Channels 13,17,67, and 77 in  
the US are an exception. Normally these channels are also  
designated for normal operation as 1W channels. However,  
in emergency, if you press and hold the PTT switch and at  
the same time you momentarily press 1/2.5/5W, the power  
level changes from 1 to 5W with the Li-Ion battery or 1 to  
2.5W with alkaline batteries installed.  
You cannot override the 1W power level setting for  
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30  
Uniden MHS550 Radio Owner’s Manual  
Channels 75 and 76.  
Transmitting  
To transmit, follow the steps below.  
1. Press ▲ or ▼ to select a channel. The selected  
channel number appears on the display along with  
the country label, and the selected power setting.  
ꢀ. Press the PTT switch. TRANSMITTING appears at  
the bottom of the screen and remains displayed as  
long as you hold down the PTT switch.  
Notes:  
• You cannot transmit on the weather frequencies. They  
are designated ‘receive’ only. An error tones sounds when  
you press PTT and a weather channel is selected. The  
displayed weather channel number flashes, and RELEASE  
PTT KEY is displayed to remind you that you cannot  
transmit on the selected channel.  
• You cannot transmit on Channel 70, and 15 in the USA.  
Channel 70 is reserved for digital data only while channel  
15 is reserved for receive only. If you attempt to transmit,  
RELEASE PTT KEY appears in the LCD message line.  
• Do not hold down PTT while turning on the radio. An error  
tone sounds and the same message appears.  
• Pressing PTT halts Scanning. For Scanning and the  
settings for Dual and TripleWatch, see Page 51. If the  
channel has no carrier, the first press of PTT takes the  
radio out of scan mode. Press PTT to activate transmitting.  
Continuous transmitting is limited to 5 minutes by  
regulations. After this time, an error tone sounds and  
RELEASE PTT KEY displays. After you release PTT,  
pressing PTT again restarts the 5-minute time interval.  
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Operation - Family Radio Service Band  
Fourteen FRS channels are available for transmitting and  
receiving use. The transmission/reception range depends on  
local terrain, the presence of steel and similar structures as  
well as other variables.  
1. Use either ▲ or ▼ to reach one of the 14 available  
channels.  
ꢀ. Press PTT while holding the radio a few inches from  
your mouth. Release PTT to hear the reply.  
Note: if you encounter communication interference from  
other FRS users in your area, enable the CTCSS encoding.  
See Setting CTCSS Codes on Page 41.  
Operation - AM Band  
The AM Band lets you listen  
to standard AM broadcasts  
between 500 and 1800 KHz  
depending on the chosen  
frequency step option. To select  
that option, and others, refer to  
Accessing the Menus on Page  
35.  
1. Press ▲ or ▼ to step to the desired AM station.  
ꢀ. Press and hold ▲ or ▼. The stations are selected  
rapidly and the radio stops on the next strong station.  
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Uniden MHS550 Radio Owner’s Manual  
Note: AM broadcasts are subject to interference from many  
outside sources, as well as weather disturbances. The signal  
strength and atmospheric conditions can also play a part in  
reception.  
Operation - FM Band  
1. Momentarily press  
BAND/1/2.5/5W to  
switch to the FM band.  
ꢀ. Press either ▲ or ▼ to  
select a local FM station.  
The default (USA) step option  
is ꢀ00MHz per press of either  
the ▲ or ▼ key. To change to 100MHz steps, see Page 43.  
If selected, Europe replaces USA in the upper right corner of  
the LCD.  
Note: Typical FM broadcasts rarely reach more than 30  
miles from the transmitter and terrain may also be a factor.  
Operation - Aircraft Band  
1. Momentarily press  
BAND/1/2.5/5W to  
change to the aircraft  
band.  
ꢀ. Press either ▲ or ▼  
to select a channel.  
Hold down either key to  
change frequencies rapidly.  
• The default aircraft step option is ꢀ5KHz steps per press of  
either the ▲ or ▼ key.  
• After holding ▲ for more than a second, if you release it,  
the radio will scan all frequencies until it finds a signal, and  
will stay on that frequency.  
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• Memory channels can be added and deleted as in VHF  
mode. Press SCAN/MEM to scan those channels in  
memory until a channel with signal is reached.  
Using the Radio Menu Options  
The MHS550 lets you select options that personalize your  
use of the radio and makes using it more convenient. Each  
band has menu options specific to that band.  
To access the menu options for any band, press MENU. The  
options for each band are:  
Marine Band  
FRS Band  
AM Band  
FM Band  
Aircraft Band  
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Uniden MHS550 Radio Owner’s Manual  
Accessing the Menus  
To access the menu selections for each band, change to that  
band and press MENU. To exit a menu for any band, press  
MENU again or use ▲ or ▼ to scroll to EXIT on that menu.  
Then press ENTER to return to the previous screen.  
Note: if during any of the following operations you fail to  
press a key or make a selection in more than 30 seconds,  
the radio returns to standard marine mode. Each band has  
several menu options in common while other choices are  
specific to that band. The option order for each band is:  
Marine  
FRS  
AM  
FM  
Aircraft  
VHF/WX  
Lamp  
Adjust  
Lamp  
Adjust  
USA/CAN/INT  
Lamp Adjust  
Contrast  
CODE  
Lamp  
Adjust  
Lamp  
Adjust  
Contrast Contrast  
FM  
Muting  
Contrast Contrast  
Dual or  
Tuning  
Tri  
Dual or Tri  
Watch  
Tuning  
Steps  
Steps  
Watch  
Key  
Beep  
Key  
Beep  
Key  
Beep  
Key  
Beep  
Key Beep  
FIPS Codes  
Exit  
Exit  
Exit  
Exit  
Channel  
Name  
Exit  
USA/CAN/INT (U.I.C.)  
[Marine Band Only]  
The radio is set as a factory default  
to the USA channel frequencies. To  
change to either Canadian [CAN] or  
International [INT] channels follow  
these steps.  
UIC CHANNELS  
USA Mode  
Canadian Mode  
Intl Mode  
Exit  
1. Press either ▲ or ▼ until you  
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highlight USA/CAN/INT.  
ꢀ. Press ENTER.  
3. Press either ▲ or ▼ until the country mode is high-  
lighted. Press ENTER to select it.  
4. Scroll to EXIT to exit the menu then press ENTER to  
return to radio operation.  
Note: the radio remembers the last selection setting you make  
when powered down.  
Lamp (Backlight) Adjust  
[For All Bands]  
LAMP ADJUST  
Always Off  
Timer  
Always On  
Exit  
The backlight that provides convenient illumination of the  
keys and the LCD has three settings.  
1. Press ▲ or ▼ to scroll to LAMP ADJUST.  
ꢀ. Press ENTER. LAMP ADJUST appears at the top of  
the screen. Highlight either Always Off, Always On, or  
Timer.  
3. Press ENTER to select your choice.  
4. To set the on-time duration of the backlight, select  
Timer then highlight either 5 seconds (default), 30  
seconds, 1 minute, or 5 minutes then press ENTER. A  
double beep sounds to confirm your selection.  
5. Scroll to EXIT and press ENTER to return to the  
menu screen.  
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Uniden MHS550 Radio Owner’s Manual  
Adjusting Display Contrast  
[For All Bands]  
You can adjust the contrast  
setting of the LCD to  
accommodate various viewing  
conditions.  
Contrast  
Adjust  
1. Press ▲ or ▼ from the  
band’s menu screen  
to highlight Contrast.  
Press ENTER.  
05  
2. Press ▲ or ▼ to increase or decrease the level  
which is indicated by the number displayed (01 to  
10) and the thermometer bar. You see the screen  
contrast change as you change the setting from 01  
to 10.  
3. Press ENTER to save your selection. The display  
returns to the band’s menu screen.  
Setting Dual or TripleWatch (Tri Watch)  
[For Marine and FRS Band Only]  
There are two specialty  
channels: 16, and 9. Channel  
Dual/Tri Watch  
16 is the primary distress/  
16/9 TriWatch  
16 DualWatch  
Exit  
Coast Guard/Hailing channel  
while Channel 9 is typically the  
backup hailing/calling channel  
for areas where there is higher  
level of marine traffic. Depending on your location, you can  
choose to monitor both distress Channel 16, the extra hailing  
Channel 9 as well as the radio channel you are otherwise  
using (TripleWatch), or you can choose to only monitor  
Channel 16 and your regular channel (DualWatch) which lets  
the radio check each channel more frequently.  
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1. From the marine band’s menu screen, use ▲ or ▼ to  
scroll to the Dual/TriWatch option. Press ENTER.  
ꢀ. Press either ▲ or ▼ to reach either 16/9 TriWatch  
(default) or 16 DualWatch. Press ENTER to select it.  
A double beep sounds and the radio returns to the  
root menu option screen.  
3. Press MENU again to return to the marine mode.  
Setting the Key Beep  
[For All Bands]  
Your MHS550 confirms a key  
KEY BEEP  
press by sounding a short  
single or double beep (default).  
You can disable this sound.  
On  
Off  
1. From the band’s menu  
screen, press ▲ or ▼ to  
highlight the KEY BEEP  
option. Press ENTER to  
select it.  
Exit  
ꢀ. Press ▲ or ▼ to select On or Off or Exit . Press  
ENTER to save your selection. The display returns to  
the band’s menu screen.  
Adding FIPS Codes  
[For Marine/Weather Band Only]  
To effectively use the Specific Area Message Encoding  
feature (S.A.M.E.) entering the code specific to your  
geographic location is required.  
These codes that provide your radio with certain geographic  
data, are known as FIPS or Federal Information  
Processing Standards codes (FIPS codes). They are a  
standardized set of numeric codes issued by the National  
Institute of Standards and Technology (NIST) to ensure  
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Uniden MHS550 Radio Owner’s Manual  
uniform identification of geographic entities through all  
federal government agencies. The entities covered include:  
states and statistically equivalent entities, counties and  
statistically equivalent entities, named populated and related  
location entities (such as, places and county subdivisions),  
and American Indian and Alaska Native areas.  
1. Press MENU. From the MARINE MENU screen,  
use ▲ or ▼ to select the FIPS option. The screen  
displays FIPS Codes and lets you select Add or Exit.  
Note: You can find your area FIPS codes and other valuable  
data from http://www.nws.noaa.gov/nwr/indexnw.htm. or by  
telephone at 1-888-NWR-SAME [1-888-697-7ꢀ63]  
ꢀ. Once you locate the code for your county or area,  
use ▲ or ▼ until the correct number appears on the  
screen then press ENTER to select it. Repeat this for  
all six digits.  
3. Enter all the codes you wish, then move to EXIT and  
ENTER to select it. The radio returns to the MARINE  
MENU screen.  
4. Press MENU again to return to the marine mode.  
Note: You can add up to 20 FIPS codes to your radio.  
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Uniden MHS550 Radio Owner’s Manual  
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Changing Channel Names  
[For Marine Band Only]  
Each channel has a default name which you can change.  
When a channel is allocated to a specific service, changing  
the name on your radio can help make identification faster  
and easier. Or you can change the name to a member of  
your boating family such as MOMS CHANNEL. You can use  
up to 16 characters.  
Press the UP or DOWN  
arrow keys to select  
Channel Name  
01A VTS/Com  
the character then  
press the enter key  
03A CG Only  
05A VTS/Com  
COAST GUARD ONLY  
1. From the MARINE MENU, press ▲ or ▼ to highlight  
Channel Name.  
ꢀ. Press ENTER. Use ▲ or ▼ to scroll to the desired  
channel you wish to rename. Press ENTER. Then  
choose Rename , Default, or Exit. and select it.  
3. If you choose Rename, press either ▲ or ▼ until the  
first letter or number of the new name appears. Press  
ENTER to select it and move to the next character.  
4. When the name is complete, repeatedly press  
ENTER until the cursor reaches the right end of the  
line. Then press ENTER again. A double beep sounds  
confirming the change and the display returns to the  
Channel Name menu. Use ▲ or ▼ to Exit and press  
ENTER.  
Channel Name  
Restoring Default Names  
[For Marine Band Only]  
Default All  
1. If you want to restore  
Exit  
all the factory default  
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Uniden MHS550 Radio Owner’s Manual  
 
names, use ▲ or ▼ to highlight Default All located  
between Channel 88A and Exit. Use ▲ or ▼ to  
highlight Yes then press ENTER to restore all the  
original names. A double beep sounds to confirm the  
action.  
ꢀ. To restore only one name to default, highlight the  
channel by using ▲ or ▼then press ENTER. Then  
use ▲ or ▼ to next highlight Default.  
Setting CTCSS Codes  
[FRS Band Only]  
If you encounter interference  
from another FRS radio while  
using the FRS band, enabling  
one of the 14ꢀ CTCSS codes  
may prevent that interference.  
FRS MENU  
CODE  
Lamp Adjust  
Contrast  
1. With the FRS band  
operational, momentarily  
press MENU.  
ꢀ. Use ▲ or ▼ to scroll to CODE.  
3. Press ENTER. The currently usedFRS channel is highlight-  
ed. To select a different channel, press either ▲ or ▼  
CHANNEL 10-OFF  
On  
FRS CODE  
Channel 09  
Off  
Channel 10  
Channel 11  
Exit  
4. Press ENTER to choose it. You can select ON, OFF,  
or EXIT, next.  
5. Use ▲ or ▼ to choose ON (to associate a CTCSS  
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code), OFF (to remove a previously associated CTCSS  
code), or EXIT (to leave this option without taking any  
action).  
Press the UP or DOWN  
arrow keys to select  
the character then  
press the enter key  
0
6. To associate a code with the chosen channel,  
highlight ON then press ENTER. You next choose a  
code number between 001 and 14ꢀ.  
7. Use ▲ or ▼ to change the first blinking single digit on  
the screen to either 0 or 1. Press ENTER to move to  
the middle digit.  
8. Use ▲ or ▼ to increment or decrement the middle  
digit. If the first digit is 0, then you can select a middle  
number between 0 and 9. If the first number is 1, then  
only select a middle number value between 0 and 4  
to avoid an error when your entry is complete as the  
highest complete code is 142. Press ENTER. If you  
decide you must change the first digit, press MENU to  
return to the first digit.  
9. Use ▲ or ▼ to change the third digit between 0 and  
9. Press ENTER when done. The screen changes  
back to EXIT and displays the Channel at the top  
along with the chosen code number. When the screen  
reverts to the operational screen, the CODE OFF  
message has been replaced by the code number.  
Note: CTCSS codes range between 1 and 142. If you set a  
code number outside this range (for example 190), when you  
press ENTER to set that number, an error tone sounds to tell  
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Uniden MHS550 Radio Owner’s Manual  
you to make a proper selection within the correct range.  
Setting Frequency Steps  
[AM, FM Only]  
In the United States there are 10 KHz steps between AM  
stations. In other parts of the world such as Europe, the step  
frequency is 9 KHz.  
There are ꢀ00 MHz steps between stations in the United  
States on the FM band while in Europe, the step is 100 MHz.  
You can select which step you use.  
AM Band  
1. From the AM MENU, scroll using ▲ or ▼ to highlight  
Tuning Steps. Press ENTER.  
ꢀ. Use ▲ or ▼ to choose either 9 KHz or 10 KHz Steps  
or Exit to make no change.  
3. Press ENTER to set your choice. The screen returns  
to the AM MENU. Either scroll to Exit or wait until the  
radio times out and returns to the previously selected  
AM station.  
FM Band  
1. From the FM MENU, scroll using ▲ or ▼ to highlight  
Tuning Steps. Press ENTER.  
ꢀ. Use ▲ or ▼ to choose either 100 MHz or 200 MHz  
Steps or Exit to make no change.  
3. Press ENTER to set your choice. The screen returns  
to the FM MENU. Either scroll to Exit or wait until the  
radio times out and returns to the previously selected  
FM station.  
Note: during the time you are taking these steps, your radio  
continues to broadcast the station selected.  
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Setting FM Muting  
[FM Band Only]  
You can turn FM Muting ON to silence your radio as you tune  
frequencies where either no station exits or the station that  
is using that frequency is weak. Muting eliminates the noise  
unless the level of the signal is sufficient for comfortable  
listening.  
1. Select the FM band. Press MENU.  
ꢀ. Use ▲ or ▼ to FM Muting. Press ENTER to select it.  
3. Use ▲ or ▼ to choose either On to enable muting,  
Off to disable a previously set muting on condition or  
Exit to take no action. Press ENTER.  
With muting on, as you tune through the FM band, the usual  
noise from weak or unassigned frequencies in your area will  
be silenced.  
Other Options  
Setting the Key Lock  
[For All Bands]  
To prevent keys from being  
accidentally operated, set the  
Marine Band  
5 Watts  
Key Lock. Hold down LIGHT/  
USA  
LOCK for ꢀ seconds. KEYPAD  
Locked  
LOCKED appears on the VHF  
display bottom for 3 seconds  
then the message line displays  
what information had been  
KEYPAD LOCKED  
shown before you pressed LIGHT/LOCK.  
Locked remains next to the channel number or frequency to  
remind you that the locked option is enabled for all bands.  
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Uniden MHS550 Radio Owner’s Manual  
During Key Lock mode, you can adjust only the following  
controls:  
• PTT switch  
• Light/Lock key  
• Volume  
• Squelch  
• 1/ꢀ.5/5W (Only while pressing and holding PTT.)  
If any other control is used, an error tone sounds.  
To disable the keypad lock, press and hold LIGHT/LOCK  
for about ꢀ seconds or turn power off then on. KEYPAD  
UNLOCKED appears briefly on the VHF display only. The  
LOCKED display disappears.  
Note: if the radio receives either a weather alert or decodes  
a severe weather S.A.M.E. code transmission, the keypad  
automatically unlocks.  
Manually Selecting Coast Guard/Distress/Hailing  
Channels  
In addition to using Triple or  
DualWatch to monitor the  
Coast Guard/Distress/Hailing  
channels, you can manually  
select them at any time.  
To select your Coast Guard/  
Distress/Hailing channel,  
repeatedly press 16/9/TRI. At  
the first press, the radio switches to Channel 16, the primary  
Coast Guard/Distress/Hailing channel. 16 appears on the  
screen. Press the key again to switch to Channel 9, the  
backup calling channel. 9 appears and NON COMMERCIAL  
appears at the bottom for USA channels. Press again to  
return to the standard marine channels.  
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If you are listening to a weather (WX/ALERT) channel and  
you press 16/9/TRI, the radio drops out of weather mode and  
switches to Channel 16 and displays 16.  
Storing a Channel or Frequency in Memory  
[For All Bands]  
Once you have stored channels in memory, you can set the  
radio to scan those channels for activity. You can also store  
and later use AM, FM, and Air frequencies as memorized  
Station Presets. To select and store a channel or frequency  
follow these steps.  
1. Use ▲ or ▼ until you display a channel you want to  
store.  
ꢀ. Press and hold SCAN/  
MEM to store the  
channel in memory. A  
double beep sounds  
to confirm your action.  
MEMORY appears near  
the channel or frequency  
displayed.  
Memory  
CHANNEL STORED appears at the bottom of the  
display for the VHF band only.  
If you take no further action, the screen returns to the  
standard marine screen in 3-seconds.  
3. To remove a channel from memory, with the stored  
channel displayed, press and hold SCAN/MEM.  
MEMORY disappears.  
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Uniden MHS550 Radio Owner’s Manual  
Selecting and Using the  
Weather Channel and Weather Alert (WX/  
ALERT)  
The radio receives ten National  
Oceanic and Atmospheric  
Administration weather  
channels. Although the radio  
receives all ten, one channel  
will be received best due to  
your geographic location.  
1. Briefly press WX/ALERT to activate the weather  
band. The screen displays Weather Band at the  
upper left and the channel number. The frequency  
of that channel number appears at the bottom of the  
screen. You can find a complete listing of the weather  
channels in the Reference pages.  
ꢀ. Use ▲ or ▼ to change between WX/ALERT  
channels. Select the channel with the best reception.  
Note: the radio’s memory retains the channel that  
appears when you switch to WX/ALERT mode in  
memory when you turn off the radio.  
3. To switch to the Alert mode, press and hold down  
WX/ALERT for about ꢀ seconds. WEATHER ALERT  
MODE ENABLED scrolls along the bottom of the  
display.  
If the radio receives a weather alert by means of either a  
S.A.M.E by decoding the entered FIPS code or if the radio is  
in the marine channel mode, detecting the 1050Hz tone, the  
radio sounds an alarm and displays an alert message at the  
bottom of the screen, such as HURRICANE WARNING.  
Note: if the event code is longer than 16 characters, the  
display label scrolls across the display bottom then changes  
to the abbreviated format. Thus, HURRICANE WARNING  
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(17 spaces) becomes HURRICANE WARN... and remains.  
4. To verify if the radio is in the ALERT mode, press  
and hold WX/ALERT for about 2 seconds. If ALERT  
is active, WEATHER ALERT MODE ENABLE scrolls  
along the screen bottom. This message appears for  
about 6 seconds then returns to the marine standard  
screen.  
If the radio is set to alert mode and you press and hold WX/  
ALERT for about ꢀ seconds, the radio exits alert mode, and  
the screen scrolls WEATHER ALERT MODE DISABLED.  
For greater details regarding SAME Event Codes, refer to  
the NOAA website mentioned on Page 39.  
Using the TripleWatch or DualWatch Mode  
[For Marine. Weather Channel, and FRS Band]  
If during setup of your MHS550, you selected Triple or  
DualWatch mode. The following shows you how to use this  
valuable feature.  
1. To activate TripleWatch, from the active marine or  
FRS radio screen, press and hold 16/9/TRI for about  
ꢀ seconds.  
Marine Band  
5 Watts  
Marine Band  
5 Watts  
USA  
Marine Band  
5 Watts  
USA  
USA  
Memory  
A
TRIWATCH  
TRIWATCH  
TRIWATCH  
2 sec  
immediate  
immediate  
The screen displays TRIWATCH in the message line area  
(marine) or adjacent to the channel number (FRS) and  
the radio begins to check two additional channels in rapid  
sequence every ꢀ seconds: the currently selected marine  
channel, the backup calling Channel 9, then the Coast  
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48  
Uniden MHS550 Radio Owner’s Manual  
Guard/Distress/Hailing Channel 16, before starting with the  
current channel again.  
ꢀ. To exit either mode, press and hold 16/9/TRI for about  
ꢀ seconds.  
Notes:  
•
•
If you selected DualWatch during setup, when  
activated, every two seconds, the radio checks the  
current channel then it checks Channel 16 before  
returning to your selected channel. DUALWATCH  
appears on the display bottom during this cycle.  
If you enable TripleWatch or DualWatch from a  
Weather Channel, the same watch cycle occurs.  
When the radio checks the selected weather channel,  
the screen displays Weather Band in the upper left  
corner. When the radio checks Channel 9, Channel  
16, or both, the screen briefly displays Marine Band at  
the upper left.  
•
If you momentarily press SCAN/MEM, the  
TripleWatch or DualWatch functions as described  
above. Channels stored in memory are also scanned.  
If you want to change the channels being scanned,  
momentarily press SCAN/MEM again, or press WX/  
ALERT or PTT, to exit scanning (TripleWatch or  
DualWatch continues). Then use ▲ or ▼ to manually  
select another marine channel and press and hold  
SCAN/MEM to store it. Momentarily press SCAN/  
MEM to resume scanning.  
•
In scan mode, the radio pauses on an active channel  
and resumes scanning ꢀ seconds after the channel  
activity ceases.  
Scanning - The Basics and Beyond  
Marine VHF radios use scanning to let you monitor several  
channels at once. It’s common to want to listen most of  
Uniden MHS550 Radio Owner’s Manual  
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the time to a specific channel, yet also check for traffic on  
selected other channels. To accomplish this, your MHS550  
has several scanning modes which can be used based on  
your needs.  
DualWatch — allows you to monitor a primary channel, for  
example Channel 68, yet check for traffic on Channel 16 ev-  
ery two seconds.  
TripleWatch — lets you monitor a primary channel, for ex-  
ample Channel 68, yet check for traffic on Channels 16 and  
9 every two seconds.  
Weather Alert (WX/ALERT) — lets you monitor one or more  
channels, yet check for weather alerts on a selected weath-  
er channel every 7 seconds. First select the Weather Mode  
(WX/ALERT) and choose the clearest weather channel using  
▲ or ▼ before using Weather Alert.  
Normal Scanning — lets you monitor two or more channels  
in rapid succession. When the radio detects traffic on any  
of the channels in memory, it pauses scanning until the  
traffic stops, then continues scanning after an additional two  
seconds.  
DualWatch Scanning — lets you monitor two or more  
channels in succession, but also monitors Channel 16 every  
two seconds.  
TripleWatch Scanning — as above, but also monitors  
Channel 9.  
Notes:  
• Most of these scanning modes require that two or more  
channels are first entered into memory. This is done by  
selecting the desired channel using ▲ or ▼, then pressing  
and holding SCAN/MEM for two seconds. CHANNEL  
STORED appears in the display. Press and hold SCAN/  
MEM a second time to remove the channel from memory.  
These various scanning modes can be turned on and off  
using three keys — 16/9/TRI, WX/ALERT, and SCAN/MEM.  
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50  
Uniden MHS550 Radio Owner’s Manual  
The scanning modes can be used in conjunction with one  
another, or used separately.  
• Pressing and holding 16/9/TRI, for example, starts  
and stops TripleWatch mode. TRIWATCH is shown in  
the display when it is selected. There are insufficinet  
characters available on the LCD panel to display  
“TripleWatch.”  
• Pressing and holding WX/ALERT starts and stops  
Weather Alert mode.  
• Pressing SCAN/MEM quickly starts and stops Normal  
Scan mode.  
You can choose either Dual or TripleWatch (whether or not  
Channel 9 is scanned as well as Channel 16) by making a  
menu selection. Press MENU, then use ▲ or ▼ to reach  
Dual/Tri Watch. Next select 16/9 TriWatch or 16 DualWatch.  
Press MENU again to return to radio operation.  
• AM, FM, and AIR Bands: You can store up to ꢀ5  
frequencies in memory for the AM. FM, or Air band, press  
and hold SCAN/MEM for about ꢀ seconds until you hear a  
double beep confirmation. Memory appears on the display.  
• If you want to remove a frequency already stored, with  
that frequency displayed, press and hold SCAN/MEM for  
another ꢀ seconds until you hear the double beep sound.  
Memory disappears.  
• Once you have stored two or more frequencies in the AM,  
FM, or AIR band, you can move from station to station  
within that band [Station Preset] by pressing SCAN/MEM  
briefly then using ▲ to jump from station to station.  
Normal Scanning  
To activate Normal Scanning, momentarily press SCAN/  
MEM. The radio scans all the channels you stored in memory  
from lowest to highest. The VHF marine band display shows  
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51  
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CHANNEL SCAN at the bottom. The FRS band displays  
SCAN.  
TripleWatch and DualWatch Scanning [VHF - FRS]  
For the marine, weather, and FRS bands only, to initialize the  
TripleWatch scanning mode,  
Marine Band  
5 Watts  
press and hold 16/9/TRI. Now  
TRIWATCH SCAN appears on  
the LCD’s message line area.  
The scan check sequence  
becomes — the working  
USA  
Alert  
Memory  
A
CHANNEL SCAN  
channel is checked then the  
radio checks Channel 9 and  
then Channel 16, in that order, every ꢀ seconds.  
If you have set DualWatch as your default mode, by selecting  
that option from the menu, Channel 9 is not checked and  
DUALWATCH SCAN appears on the display.  
To disable Triple or DualWatch and revert to Normal  
Scanning of stored channels, press and hold 16/9/TRI for  
2 seconds. Channel 16 and 9 are no longer checked. The  
radio continues to scan only channels stored in memory.  
CHANNEL SCAN appears on the bottom and each channel  
number is displayed in rapid sequence.  
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5ꢀ  
Uniden MHS550 Radio Owner’s Manual  
Both Watches and Weather Channel [VHF-FRS]  
If both the Weather Alert and the TripleWatch features are  
enabled when you press SCAN/MEM, the radio starts  
checking the memory channels in ascending order. Then it  
checks Channel 9 and 16 every 2 seconds and finally, it  
checks the active weather channel approximately every 7  
seconds, looking for the alert tone (1050Hz). The radio then  
repeats the cycle. If the radio detects a weather alert tone  
during the check cycle, it remains on the weather channel  
until you disable the weather mode.  
~7 seconds  
2 seconds  
CH 07A  
CH 08A  
CH 10  
CH 21A  
CH 22A  
CH 64A  
CH 79A  
CH 80A  
WX  
09  
16  
09  
16  
ALERT  
TONE  
Scan Sequence of Stored Channels,  
TripleWatch, and TripleWatch with WX  
= Channel Check  
Notes:  
• If during scanning, the radio detects a signal, it stops  
scanning and remains on the detected channel for ꢀ  
seconds after the activity ends before resumption of  
scanning.  
• During scanning, you can press SCAN/MEM, 16/9/TRI, or  
WX/ALERT to halt scanning. Depending upon which key  
you used, the screen shows one of the scanned channels,  
your local weather channel, or the distress channel.  
• All channels, except CH70, and the weather channels,  
can be stored in memory. When you turn off the radio, all  
Uniden MHS550 Radio Owner’s Manual  
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memory stored channels are retained so that upon turning  
the radio on again, they are immediately available.  
Scanning (Memory Preset Station Tuning) in the  
AM, FM, and Aircraft Bands  
As you can store up to ꢀ5 frequencies in each of the other  
bands, you can also move from one stored frequency  
(station) to the next in each band. You cannot set presets  
that cross from one band to another.  
1. To tune to memorized Station Presets that you have  
stored, that are valid station frequencies, briefly press  
SCAN/MEM. Memory and Scan appear in the display.  
If you inadvertantly store three FM frequencies for  
which there are no stations in your area, no presets  
will be available.  
ꢀ. Repeatedly press ▲ to move from the first stored  
frequency to the second and so on.  
3. If you press ▼, an error tone sounds. If you want to  
remove a frequency from memory, when you press  
▲ and that frequency is displayed, press and hold  
SCAN/MEM until the double beep sounds. Memory  
disappears from the display and the frequency is  
removed from memory. It is no longer available for  
that session.  
Note: if no frequencies have been stored and you  
press SCAN/MEM, an error tone sounds.  
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54  
Uniden MHS550 Radio Owner’s Manual  
Examples of Mode Applications  
While there are many scenarios for making a mode choice  
or setting the MHS550 in a certain manner that applies to  
your own special requirements, we hope the following three  
examples might help you get started.  
1. You’re a safety boat at the scene of a yacht race. You  
have to monitor the Intership safety channel, 06, yet  
you want to monitor Channel 16 for emergency traffic.  
Select DualWatch, with Channel 06 as the normal  
working channel.  
ꢀ. You’re fishing, and there are four channels being used  
by local anglers: Channels 68, 69, 71, and 09. Put all  
four channels into memory, and use Normal Scanning  
to listen to them in succession.  
3. You’re cruising with your family on Lake Erie, and you  
are concerned about a summer thunderstorm in your  
area. First select the weather channel with the best  
reception, then return to the marine band. Press and  
hold WX/ALERT so that your radio monitors the local  
weather channel for Weather Alert broadcasts.  
Accessory Options — Using the External  
Speaker/Mic Jack  
You can connect an optional external speaker-mic to this  
watertight jack. Unscrew the cap, which is held by the rubber  
cap-keeper to prevent loss. Insert the special gasketed  
plug and screw down the shell, which assures prevention  
of water entering the jack. Two available units are HHSPM  
Speaker Mic [Uniden SKU 78304ꢀ5] and VOX100 Headset  
Mic. [Uniden SKU 7830409] For details, consult your Uniden  
dealer or call 1-800-554-3988.  
Uniden MHS550 Radio Owner’s Manual  
55  
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Care and Maintenance  
Your MHS550 is a precision electronic product and you  
should treat it accordingly. Due to the rugged design, very  
little maintenance is required. However a few precautions  
should be observed:  
• If the antenna has been damaged, do not transmit except  
in an emergency situation. Transmitting with a defective  
antenna may cause further radio damage.  
• You are responsible for continued FCC technical  
compliance of your radio.  
Troubleshooting  
If you missing parts or accesoories, call Parts & Service at  
1-800-554-3988.  
In the event that the radio fails to perform, try the following  
remedies. If you have still problems, visit our customer sup-  
port website at: www.uniden.com or call our customer care  
specialists at 1-800-586-0409.  
Refer to the following table to possibly assist you to remedy  
simple difficulties.  
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56  
Uniden MHS550 Radio Owner’s Manual  
Troubleshooting  
SYMPTOM  
CAUSE  
REMEDY  
Won’t power ON.  
Low or Discharged battery  
pack.  
Recharge Lithium Ion battery.  
Replace battery.  
Use alkaline batteries  
temporarily.  
When the PTT is pressed -  
TX icon appears and  
another radio can hear a  
‘click’ but no audio is  
heard.  
Bad microphone element  
Send in for repair.  
When scanning, radio  
stops on a particular  
channel all the time.  
A source of noise is  
nearby.  
Turn Squelch clockwise to  
reduce noise so that scan  
function skips channel or  
remove channel from scan.  
There is noise on the  
receiver that the squelch  
will not eliminate.  
An external noise is being  
generated by some device.  
Turn off the offending device or  
contact the device  
manufacturer regarding FCC  
Part 15 “unintentional radiator.”  
You made arrangements  
to communicate with  
another VHF radio on a  
specific channel, and you  
cannot hear them.  
You and the other user are  
using different country  
modes (USA/CAN/INT)  
Be sure both are using the  
same country mode. Some  
modes use the same numeric  
selections. Channel 16, the  
Distress, Safety, and Calling  
channel is the same on all three  
modes.  
You cannot change the  
transmit power setting.  
You selected a channel  
that is limited to a 1watt  
transmit power such as  
channel 13, or you selected  
a ‘receive only’ channel  
such as Weather band.  
Change to an unrestricted  
Transmit/receive channel.  
The SCAN/MEM key does  
not start scanning.  
Cause 1: No channels  
have been stored in  
memory.  
Remedy 1: Use the  
SCAN/MEM key to store  
several selected channel in  
memory.  
Cause ꢀ: Squelch is not  
adjusted correctly.  
Remedy ꢀ: Adjust the Squelch  
setting to a point just below that  
when the background noise  
disappears.  
You can hear  
The transmit power is set  
to 1W watt.  
Use BAND/1/2.5/5W to change  
to a higher transmit power level.  
transmissions, but the  
other radio cannot hear  
you.  
Uniden MHS550 Radio Owner’s Manual  
57  
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Reference Section  
Specifications  
General  
Item  
Description  
Channels  
Frequency  
Range/Step  
All USA, Canadian, and International  
Marine-Weather: 156.05 ~ 163.275MHz, 25kHz Step  
Family Radio Service: 462.5625 ~ 467.7125MHz, 12.5kHz Step  
AM Broadcast: 500.00 ~ 1800kHz, 10 or 9kHz Step  
FM Broadcast: 87.5 ~108.0MHz, 100 or 200MHz Step  
Aircraft: 108.00 ~ 137.00MHz, 25kHz Step  
Fixed Mount type  
Antenna  
Connectors  
Controls and  
Switches  
External MIC/SPEAKER, 2.5mm Diam. 3-contact Stereo type  
Volume, Squelch with Power On/Off, Up, Down Keys,Ch16/TRI, Menu, Enter, WX Alert, Scan/Mem,  
Band/1,2.5/5W, Push to Talk, Light/Lock  
Display  
LCD 128 x 64 Full Dot Matrix  
Backlight  
LCD Front Key -yellow-green color  
Cabinet Size  
Weight  
4.21H x 2.55W x 1.38D inches (107 x 65 x 35mm)  
9.5 oz (270 g.)  
Speaker  
Microphone  
Built-in 32mm diam. Dynamic type (8ȍ, 0.7W)  
Built-in Electret type  
Supplied  
Li-Ion Battery Pack (7.4VDC, 1400mA/hr min) AC Adapter, Drop-In Charger, CLA DC Cord, Alkaline  
Battery Tray (4xAAA), Belt Clip, Hand Strap  
-30° C to 50° C. (Battery charge: 0° C to 45° C.)  
Accessories  
Operating  
Temperature  
Storage  
-30° C to 60° C  
Temperature  
AC Adapter  
Regulation  
Battery Life  
(Li-Ion)  
Input: 100VAC ~ 240VAC, 50/60Hz Output: 12VDC, 1A  
FCC, IC  
10 Hours, Min.  
Waterproof Grade  
Compliant to JIS7/IPX7 Immersion Protection Standards. Submersible in one meter of water for 30  
minutes without damage.  
Transmitter  
Items  
Frequency Tolerance @ 25° C to 50° C  
Frequency Stability -20° C to 50° C  
Carrier Power  
Unit Nominal  
PPM  
PPM  
W
±0.5  
(MRN, 5W)  
(MRN 2.5W)  
(MRN 1W)  
5
2.5  
1
W
W
(FRS/MRN 0.5W)  
(MRN 5W)  
(MRN 2.5W/1W)  
500Hz  
2000Hz  
(MRN for ± 3kHz Deviation)  
W
0.5  
53  
58  
-6  
+6  
6
Spurious Emission  
dBc  
dBc  
dB  
dB  
mV  
Modulation Frequency Response  
Microphone Sensitivity  
(FRS for ± 1.5kHz Deviation) mV  
6
Maximum Deviation@100mV Input  
(MRN)  
(FRS with Subaudio)  
±kHz  
±kHz  
%
4.5  
2.3  
0.6  
Modulation Distortion 750 ȝS  
De-emphas 0.3 to 3kHz BPF  
Hum and Noise 750 ȝS  
(MRN)  
(FRS)  
(MRN)  
(FRS)  
dB  
dB  
mA  
mA  
38  
35  
1500  
650  
De-emphas 0.3 to 3kHz PF  
Current Drain @ High Power 5W  
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58  
Uniden MHS550 Radio Owner’s Manual  
Specifications (cont.)  
Receiver  
Items  
Unit Nominal Limit  
Sensitivity for 12dB SINAD  
(MRN)  
(FRS)  
(FM Broadcast) ȝV  
(Air) ȝV  
(AM Broadcast) ȝV  
Threshold  
Tight  
(FRS)  
ȝV  
ȝV  
0.3  
0.35  
1.0  
1.0  
1.0  
0.1  
0.7  
8
0.4 max  
0.5 max.  
3.0 max.  
30 max.  
2.0 max.  
0.25 max.  
2.0 max.  
12 max.  
3 to 7  
Squelch Sensitivity  
ȝV  
ȝV  
dB  
dB  
CTCSS/DCS Opening SINAD  
Audio Freq. Response 1kHz Ref.  
(MRN) @ 500Hz  
6
(MRN) @ 2000Hz  
(FRS) @ 500Hz  
(FRS) @ 2000Hz  
Adjacent Channel Selectivity  
dB  
dB  
dB  
dB  
-6  
6
-6  
72  
40  
63  
75  
-65  
-9 to -5  
3 to 7  
-9 to -5  
60 min.  
30 min.  
55 min.  
50 min.  
-57 max.  
(MRN ±25kHz)  
(FRS ±12.5kHz) dB  
dB  
IM Rejection(MRN)  
Image and Spurious Rejection  
Conducted Spurious Emission  
at the antenna terminal  
Hum and Noise Ratio  
(MRN)  
dB  
dBm  
(MRN)  
(FRS)  
dB  
dB  
50  
37  
35 min.  
32 min  
(AM Broadcast) dB  
(FM Broadcast) dB  
42  
53  
42  
1.2  
0.45  
2.9  
72  
32 min.  
32 min.  
32 min.  
10 max.  
0.3 min.  
3.8 max.  
85 max.  
250 max.  
(Air)  
dB  
%
THD @ Standard Output Power (MRN)  
Audio Output Power @ 10% THD (MRN)  
Oscillator Dropout Voltage (MRN)  
Current Drain @ No Signal (MRN)  
Current Drain @ Maximum Output (MRN)  
W
V
mA  
mA  
220  
Uniden MHS550 Radio Owner’s Manual  
59  
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USA Channel Frequencies  
Ch  
No.  
1A  
RX Freq  
TX Freq  
156.0500  
156.0500  
Status  
Full Name  
16 Char Name  
Simplex  
VESSEL TRAFFIC  
SYSTEM/  
VTS/  
COMMERCIAL  
COMMERCIAL  
COAST GUARD,GOVT  
ONLY  
VESSEL TRAFFIC  
SYSTEM/COMMER  
CIAL  
3 A  
5 A  
156.1500  
156.1500  
156.ꢀ500  
156.ꢀ500  
Simplex  
Simplex  
COAST GUARD  
ONLY  
VTS/  
COMMERCIAL  
6
156.3000  
156.3000  
156.3500  
156.3500  
156.4000  
156.4000  
156.4500  
156.4500  
156.5000  
156.5000  
156.5500  
156.5500  
156.6000  
156.6000  
156.6500  
156.6500  
156.7000  
156.7000  
156.7500  
Inhibit  
156.8000  
156.8000  
156.8500  
156.8500  
156.9000  
156.9000  
156.9500  
156.9500  
161.6000  
157.0000  
157.0000  
157.0000  
157.0500  
157.0500  
157.1000  
157.1000  
157.1500  
157.1500  
161.8000  
157.ꢀ000  
161.8500  
157.ꢀ500  
161.9000  
157.3000  
161.9500  
157.3500  
16ꢀ.0000  
157.4000  
156.0750  
156.0750  
156.1750  
156.1750  
156.ꢀꢀ50  
156.ꢀꢀ50  
156.ꢀ750  
156.ꢀ750  
156.3ꢀ50  
156.3ꢀ50  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
INTER-SHIP SAFETY  
SAFETY  
7 A  
8
COMMERCIAL  
COMMERCIAL  
NON COMMERCIAL  
COMMERCIAL  
COMMERCIAL  
COMMERCIAL  
9
NON  
COMMERCIAL  
COMMERCIAL  
10  
11  
VESSEL TRAFFIC  
SYSTEM  
VESSEL TRAFFIC  
SYSTEM  
VESSEL TRAFFIC  
VESSEL TRAFFIC  
1ꢀ  
13  
Simplex,  
1W  
Simplex  
BRIDGE TO BRIDGE  
BRIDGE TO  
BRIDGE  
VESSEL TRAFFIC  
14  
VESSEL TRAFFIC  
SYSTEM  
ENVIRONMENTAL  
15  
Receive  
Only  
Simplex  
ENVIRONMENTAL  
DISTRESS  
16  
DISTRESS, SAFETY,  
CALLING  
GOVT MARITIME  
CONTROL  
17  
Simplex,  
1W  
Simplex  
GOVERNMENT  
COMMERCIAL  
COMMERCIAL  
18 A  
19 A  
ꢀ0  
COMMERCIAL  
Simplex  
Duplex  
Simplex  
Simplex  
Simplex  
Simplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
COMMERCIAL  
PORT OPERATION  
PORT OPERATION  
COAST GUARD ONLY  
COAST GUARD  
PORT  
OPERATION  
PORT  
OPERATION  
COAST GUARD  
ONLY  
ꢀ0 A  
ꢀ1 A  
ꢀꢀ A  
ꢀ3 A  
ꢀ4  
COAST GUARD  
COAST GUARD ONLY  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
COAST GUARD  
COAST GUARD  
ONLY  
MARINE  
OPERATOR  
MARINE  
OPERATOR  
MARINE  
OPERATOR  
MARINE  
OPERATOR  
MARINE  
ꢀ5  
ꢀ6  
ꢀ7  
ꢀ8  
OPERATOR  
COAST GUARD  
61 A  
63 A  
64 A  
65 A  
66 A  
VESSEL TRAFFIC  
SYSTEM  
COMMERCIAL  
VESSEL TRAFFIC  
COMMERCIAL  
PORT OPERATION  
PORT OPERATION  
PORT  
OPERATION  
PORT  
OPERATION  
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60  
Uniden MHS550 Radio Owner’s Manual  
USA Channel Frequencies  
16ꢀ.0000  
157.4000  
156.0750  
156.0750  
156.1750  
156.1750  
156.ꢀꢀ50  
156.ꢀꢀ50  
156.ꢀ750  
156.ꢀ750  
156.3ꢀ50  
156.3ꢀ50  
156.3750  
156.3750  
156.4ꢀ50  
156.4ꢀ50  
156.4750  
156.4750  
156.5ꢀ50  
Inhibit  
Duplex  
MARINE OPERATOR  
MARINE  
OPERATOR  
COAST GUARD  
ꢀ8  
61 A  
63 A  
64 A  
65 A  
66 A  
67  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
COAST GUARD  
VESSEL TRAFFIC  
SYSTEM  
COMMERCIAL  
VESSEL TRAFFIC  
COMMERCIAL  
PORT OPERATION  
PORT OPERATION  
BRIDGE TO BRIDGE  
NON COMMERCIAL  
NON COMMERCIAL  
PORT  
OPERATION  
PORT  
OPERATION  
BRIDGE TO  
BRIDGE  
NON  
COMMERCIAL  
Simplex,  
1W  
Simplex  
68  
Simplex  
NON  
69  
COMMERCIAL  
DSC RECEIVE  
ONLY  
Receive  
Only  
DIGITAL SELECTIVE  
CALLING  
70  
156.5750  
156.5750  
156.6ꢀ50  
156.6ꢀ50  
156.6750  
156.6750  
156.7ꢀ50  
156.7ꢀ50  
156.7750  
156.7750  
156.8ꢀ50  
156.8ꢀ50  
156.8750  
156.8750  
156.9ꢀ50  
156.9ꢀ50  
156.9750  
156.9750  
157.0ꢀ50  
157.0ꢀ50  
157.0750  
157.0750  
157.1ꢀ50  
157.1ꢀ50  
157.1750  
157.1750  
161.8ꢀ50  
157.ꢀꢀ50  
161.8750  
157.ꢀ750  
161.9ꢀ50  
157.3ꢀ50  
161.9750  
157.3750  
16ꢀ.0ꢀ50  
157.4ꢀ50  
157.4ꢀ50  
157.4ꢀ50  
Simplex  
NON COMMERCIAL  
NON  
COMMERCIAL  
NON  
COMMERCIAL  
PORT  
OPERATION  
PORT  
OPERATION  
PORT  
OPERATION  
PORT  
OPERATION  
PORT  
OPERATION  
NON  
COMMERCIAL  
COMMERCIAL  
71  
Simplex  
Simplex  
Simplex  
NON COMMERCIAL  
(SHIP-SHIP)  
PORT OPERATION  
7ꢀ  
73  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
74  
Simplex,  
1W  
Simplex,  
1W  
Simplex,  
1W  
Simplex  
75  
76  
PORT OPERATION  
(SHIP-SHIP)  
NON COMMERCIAL  
77  
78 A  
79 A  
80 A  
81 A  
8ꢀ A  
83 A  
84  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Simplex  
COMMERCIAL  
COMMERCIAL  
COMMERCIAL  
COAST GUARD  
COAST GUARD  
GOVERNMENT  
COAST GUARD  
COAST GUARD  
GOVERNMENT  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE  
OPERATOR  
MARINE  
OPERATOR  
MARINE  
OPERATOR  
MARINE  
OPERATOR  
MARINE  
OPERATOR  
85  
86  
87  
88  
COMMERCIAL (SHIP-  
SHIP)  
COMMERCIAL  
88 A  
Uniden MHS550 Radio Owner’s Manual  
61  
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Canadian Channel Frequencies  
Ch No. RX Freq TX Freq  
Status  
Full Name  
16 Char Name  
160.6500  
156.0500  
Duplex  
MARINE OPERATOR  
MARINE OPERATOR  
1
160.7000  
156.1000  
160.7500  
156.1500  
156.2000  
156.2000  
156.2500  
156.2500  
156.3000  
156.3000  
156.3500  
156.3500  
Duplex  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
COAST GUARD  
VESSEL TRAFFIC  
SAFETY  
2
Duplex  
3
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex, 1W  
Simplex  
Simplex  
Simplex  
Simplex, 1W  
Simplex  
Simplex  
Duplex, 1W  
Simplex  
Simplex  
Duplex  
CANADIAN COAST  
GUARD  
VESSEL TRAFFIC  
SYSTEM  
4 A  
5 A  
INTER-SHIP SAFETY  
6
COMMERCIAL  
COMMERCIAL  
COMMERCIAL  
7 A  
156.4000  
COMMERCIAL  
8
156.4000  
156.4500  
156.4500  
156.5000  
156.5000  
156.5500  
156.5500  
156.6000  
156.6000  
156.6500  
156.6500  
156.7000  
156.7000  
156.7500  
156.7500  
156.8000  
156.8000  
156.8500  
156.8500  
156.9000  
156.9000  
156.9500  
156.9500  
161.6000  
157.0000  
157.0500  
157.0500  
157.1000  
157.1000  
161.7500  
157.1500  
161.8000  
157.2000  
161.8500  
157.2500  
161.9000  
157.3000  
161.9500  
157.3500  
162.0000  
157.4000  
160.6250  
156.0250  
156.0750  
156.0750  
156.1250  
156.1250  
160.8250  
156.2250  
BOATER CALLING  
CHANNEL  
COMMERCIAL  
CALLING  
9
COMMERCIAL  
10  
VESSEL TRAFFIC  
SYSTEM  
VESSEL TRAFFIC  
SYSTEM  
VESSEL TRAFFIC  
VESSEL TRAFFIC  
BRIDGE TO BRIDGE  
VESSEL TRAFFIC  
ENVIRONMENTAL  
DISTRESS  
11  
12  
BRIDGE TO BRIDGE  
13  
VESSEL TRAFFIC  
SYSTEM  
ENVIRONMENTAL  
14  
15  
DISTRESS, SAFETY,  
CALLING  
STATE CONTROL  
16  
STATE CONTROL  
COMMERCIAL  
17  
COMMERCIAL  
18 A  
19 A  
20  
CANADIAN COAST  
GUARD  
PORT OPERATION  
COAST GUARD  
PORT OPERATION  
COAST GUARD  
COAST GUARD  
COAST GUARD  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
COAST GUARD  
COAST GUARD  
MARINE OPERATOR  
CANADIAN COAST  
GUARD  
CANADIAN COAST  
GUARD  
CANADIAN COAST  
GUARD  
MARINE OPERATOR  
21 A  
22 A  
23  
Duplex  
24  
Duplex  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
25  
Duplex  
26  
Duplex  
27  
Duplex  
28  
Duplex  
60  
Simplex  
Simplex  
Duplex  
CANADIAN COAST  
GUARD  
CANADIAN COAST  
GUARD  
61 A  
62 A  
64  
MARINE OPERATOR  
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6ꢀ  
Uniden MHS550 Radio Owner’s Manual  
Canadian Channel Frequencies  
Ch No.  
64 A  
RX Freq TX Freq  
156.ꢀꢀ50  
156.ꢀꢀ50  
156.ꢀ750  
156.ꢀ750  
156.3ꢀ50  
156.3ꢀ50  
156.3750  
156.3750  
156.4ꢀ50  
156.4ꢀ50  
156.4750  
156.4750  
156.5ꢀ50  
Inhiber  
Status  
Full Name  
16 Char Name  
Simplex  
MARINE OPERATOR  
MARINE OPERATOR  
65 A  
66 A  
67  
Simplex  
Simplex, 1W  
Simplex  
Simplex  
Simplex  
Receive Only  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex, 1W  
Simplex, 1W  
Simplex, 1W  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
Duplex  
SEARCH AND RESCUE  
PORT OPERATION  
BRIDGE TO BRIDGE  
NON COMMERCIAL  
NON COMMERCIAL  
SEARCH & RESCUE  
PORT OPERATION  
BRIDGE TO BRIDGE  
NON COMMERCIAL  
NON COMMERCIAL  
68  
69  
70  
DIGITAL  
CALLING  
SELECTIVE DSC RECEIVE ONLY  
71  
156.5750  
156.5750  
156.6ꢀ50  
156.6ꢀ50  
156.6750  
156.6750  
156.7ꢀ50  
156.7ꢀ50  
156.7750  
156.7750  
156.8ꢀ50  
156.8ꢀ50  
156.8750  
156.8750  
156.9ꢀ50  
156.9ꢀ50  
156.9750  
156.9750  
157.0ꢀ50  
157.0ꢀ50  
157.0750  
157.0750  
157.1ꢀ50  
157.1ꢀ50  
161.7750  
157.1750  
157.1750  
157.1750  
161.8ꢀ50  
157.ꢀꢀ50  
161.8750  
157.ꢀ750  
161.9ꢀ50  
157.3ꢀ50  
161.9750  
157.3750  
16ꢀ.0ꢀ50  
157.4ꢀ50  
NON COMMERCIAL  
NON COMMERCIAL  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
INTER SHIP  
NON COMMERCIAL  
NON COMMERCIAL  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
INTER SHIP  
7ꢀ  
73  
74  
75  
76  
77  
78 A  
79 A  
80 A  
81 A  
8ꢀ A  
83  
INTER SHIP  
INTER SHIP  
INTER SHIP  
INTER SHIP  
CANADIAN  
GUARD  
COAST COAST GUARD  
CANADIAN  
GUARD  
COAST COAST GUARD  
CANADIAN COST GUARD  
COAST GUARD  
83 A  
84  
Simplex  
Duplex  
CANADIAN  
GUARD  
COAST COAST GUARD  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
85  
Duplex  
86  
Duplex  
87  
Duplex  
88  
Duplex  
Uniden MHS550 Radio Owner’s Manual  
63  
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International Channel Frequencies  
Ch No. RX Freq TX Freq  
1
Status  
Duplex  
Full Name  
MARINE OPERATOR  
16 Char Name  
MARINE OPERATOR  
160.6500  
156.0500  
160.7000  
156.1000  
160.7500  
156.1500  
160.8000  
156.ꢀ000  
160.8500  
156.ꢀ500  
156.3000  
156.3000  
160.9500  
156.3500  
156.4000  
156.4000  
156.4500  
156.4500  
156.5000  
156.5000  
156.5500  
156.5500  
156.6000  
156.6000  
156.6500  
156.6500  
156.7000  
156.7000  
156.7500  
156.7500  
156.8000  
156.8000  
156.8500  
156.8500  
161.5000  
156.9000  
161.5500  
156.9500  
161.6000  
157.0000  
161.6500  
157.0500  
161.7000  
157.1000  
161.7500  
157.1500  
161.8000  
157.ꢀ000  
161.8500  
157.ꢀ500  
161.9000  
157.3000  
161.9500  
157.3500  
16ꢀ.0000  
157.4000  
160.6ꢀ50  
156.0ꢀ50  
160.6750  
156.0750  
160.7ꢀ50  
156.1ꢀ50  
160.7750  
156.1750  
160.8ꢀ50  
156.ꢀꢀ50  
ꢀ
Duplex  
Duplex  
Duplex  
Duplex  
Simplex  
Duplex  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
Simplex  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
INTER-SHIP SAFETY  
MARINE OPERATOR  
COMMERCIAL (SHIP-SHIP)  
BOATER CALLING CHANNEL  
COMMERCIAL  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
SAFETY  
3
4
5
6
7
MARINE OPERATOR  
COMMERCIAL  
8
9
CALLING  
10  
11  
1ꢀ  
13  
14  
15  
16  
17  
18  
19  
ꢀ0  
ꢀ1  
ꢀꢀ  
ꢀ3  
ꢀ4  
ꢀ5  
ꢀ6  
ꢀ7  
ꢀ8  
60  
61  
6ꢀ  
63  
64  
COMMERCIAL  
VESSEL TRAFFIC SYSTEM  
VESSEL TRAFFIC SYSTEM  
BRIDGE TO BRIDGE  
VESSEL TRAFFIC SYSTEM  
ENVIRONMENTAL  
VESSEL TRAFFIC  
VESSEL TRAFFIC  
BRIDGE TO BRIDGE  
VESSEL TRAFFIC  
ENVIRONMENTAL  
DISTRESS  
Simplex,  
1W  
Simplex  
DISTRESS, SAFETY, CALLING  
GOVT MARINE CONTROL  
PORT OPERATION  
Simplex,  
1W  
Duplex  
GOVERNMENT  
PORT OPERATION  
COMMERCIAL  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
COMMERCIAL  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
PORT OPERATION  
PORT OPERATION  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
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64  
Uniden MHS550 Radio Owner’s Manual  
International Channel Frequencies  
CH No.  
RX Freq TX Freq  
160.8750  
156.2750  
160.9250  
156.3250  
156.3750  
156.3750  
156.4250  
156.4250  
156.4750  
156.4750  
156.5250  
Inhibit  
156.5750  
156.5750  
156.6250  
156.6250  
156.6750  
156.6750  
Status  
Duplex  
Full Name  
MARINE OPERATOR  
16 Char Name  
MARINE OPERATOR  
65  
Duplex  
MARINE OPERATOR  
BRIDGE TO BRIDGE  
NON COMMERCIAL  
NON COMMERCIAL  
DIGITAL SELECTIVE CALLING  
NON COMMERCIAL  
NON COMMERCIAL  
PORT OPERATION  
PORT OPERATION  
MARINE OPERATOR  
BRIDGE TO BRIDGE  
NON COMMERCIAL  
NON COMMERCIAL  
DSC RECEIVE ONLY  
NON COMMERCIAL  
NON COMMERCIAL  
PORT OPERATION  
PORT OPERATION  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
81  
82  
83  
84  
85  
Simplex  
Simplex  
Simplex  
Receive  
Only  
Simplex  
Simplex  
Simplex  
Simplex  
156.7250  
156.7250  
156.775  
156.775  
Simplex  
1W  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
Simplex  
1W  
156.825  
156.825  
156.8750  
156.8750  
161.5750  
156.9250  
161.5750  
156.9750  
161.6250  
157.0250  
161.6750  
157.0750  
161.7250  
157.1250  
161.7750  
157.1750  
161.8250  
157.2250  
161.8750  
157.2750  
161.9250  
157.3250  
161.9750  
157.3750  
162.0250  
157.4250  
PORT OPERATION  
Simplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
Duplex  
PORT OPERATION (SHIP-SHIP)  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
PORT OPERATION  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
MARINE OPERATOR  
86  
87  
88  
Uniden MHS550 Radio Owner’s Manual  
65  
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NOAA Channels  
and Frequencies  
FRS Channels  
and Frequencies  
Channel  
WX01  
RX  
16ꢀ.5500  
16ꢀ.4000  
16ꢀ.4750  
16ꢀ.4ꢀ50  
16ꢀ.4500  
16ꢀ.5000  
16ꢀ.5ꢀ50  
161.6500  
161.7750  
163.ꢀ750  
Channel Frequency  
(MHz)  
1
2
462.5625  
462.5875  
462.6125  
462.6375  
462.6625  
462.6875  
462.7125  
467.5625  
467.5875  
467.6125  
467.6375  
467.6625  
467.6875  
467.7125  
WX0ꢀ  
WX03  
WX04  
WX05  
WX06  
WX07  
WX08  
WX09  
WX10  
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
CTCSS Channels  
and Frequencies  
DCS Codes  
Tone  
Octal Tone  
Octal Tone  
Octal  
Code  
1
ꢀ
3
4
5
6
7
8
Frequency (Hz)  
67.0  
Code  
ꢀ1  
ꢀꢀ  
ꢀ3  
ꢀ4  
ꢀ5  
ꢀ6  
ꢀ7  
ꢀ8  
ꢀ9  
30  
31  
3ꢀ  
33  
34  
35  
36  
37  
38  
Frequency (Hz)  
136.5  
141.3  
146.ꢀ  
151.4  
156.7  
16ꢀ.ꢀ  
167.9  
173.8  
179.9  
186.ꢀ  
19ꢀ.8  
ꢀ03.5  
ꢀ10.7  
ꢀ18.1  
ꢀꢀ5.7  
ꢀ33.6  
ꢀ41.8  
ꢀ50.3  
Number Code Number Code Number Code  
39  
40  
41  
4ꢀ  
43  
44  
45  
46  
47  
48  
49  
50  
51  
5ꢀ  
53  
54  
55  
56  
57  
58  
59  
60  
61  
6ꢀ  
63  
64  
65  
66  
67  
68  
69  
70  
71  
7ꢀ  
73  
0ꢀ3  
0ꢀ5  
0ꢀ6  
031  
03ꢀ  
043  
047  
051  
054  
065  
071  
07ꢀ  
073  
074  
114  
115  
116  
1ꢀ5  
131  
13ꢀ  
134  
143  
15ꢀ  
155  
156  
16ꢀ  
165  
17ꢀ  
174  
ꢀ05  
ꢀꢀ3  
ꢀꢀ6  
ꢀ43  
ꢀ44  
ꢀ45  
74  
75  
76  
77  
78  
79  
80  
81  
8ꢀ  
83  
84  
85  
86  
87  
88  
89  
90  
91  
9ꢀ  
93  
94  
95  
96  
97  
ꢀ51  
ꢀ61  
ꢀ63  
ꢀ65  
ꢀ71  
306  
311  
315  
331  
343  
346  
351  
364  
365  
371  
411  
41ꢀ  
413  
4ꢀ3  
431  
43ꢀ  
445  
464  
465  
466  
503  
506  
516  
53ꢀ  
546  
565  
606  
61ꢀ  
6ꢀ4  
6ꢀ7  
109  
111  
11ꢀ  
113  
114  
115  
116  
117  
118  
119  
1ꢀ0  
1ꢀ1  
1ꢀꢀ  
1ꢀ3  
1ꢀ4  
1ꢀ5  
1ꢀ6  
1ꢀ7  
1ꢀ8  
1ꢀ9  
130  
131  
13ꢀ  
133  
134  
135  
136  
137  
138  
139  
140  
141  
14ꢀ  
631  
654  
66ꢀ  
664  
703  
71ꢀ  
7ꢀ3  
731  
73ꢀ  
734  
743  
754  
036  
053  
1ꢀꢀ  
145  
ꢀ1ꢀ  
ꢀꢀ5  
ꢀ46  
ꢀ5ꢀ  
ꢀ55  
ꢀ66  
ꢀ74  
3ꢀ5  
33ꢀ  
356  
446  
45ꢀ  
454  
455  
46ꢀ  
5ꢀ3  
5ꢀ6  
71.9  
74.4  
77.0  
79.7  
8ꢀ.5  
85.4  
88.5  
91.5  
9
10  
11  
1ꢀ  
13  
14  
15  
16  
17  
18  
19  
ꢀ0  
94.8  
97.4  
100.0  
103.5  
107.ꢀ  
110.9  
114.8  
118.8  
1ꢀ3.0  
1ꢀ7.3  
131.8  
98  
99  
100  
101  
10ꢀ  
103  
104  
105  
106  
107  
108  
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66  
Uniden MHS550 Radio Owner’s Manual  
Three Year Limited Warranty  
WARRANTOR: UNIDEN AMERICA CORPORATION (“Uniden”)  
ELEMENTS OF WARRANTY: Uniden warrants, for three years, to the original  
retail owner, this Uniden Product to be free from defects in materials and  
craftsmanship with only the limitations or exclusions set out below.  
WARRANTY DURATION: This warranty to the original user shall terminate  
and be of no further effect 36 months after the date of original retail sale.  
The warranty is invalid if the Product is (A) damaged or not maintained  
as reasonable or necessary, (B) modified, altered, or used as part of any  
conversion kits, subassemblies, or any configurations not sold by Uniden,  
(C) improperly installed, (D) serviced or repaired by someone other than an  
authorized Uniden service center for a defect or malfunction covered by this  
warranty, (E) used in any conjunction with equipment or parts or as part of  
any system not manufactured by Uniden, or (F) installed or programmed by  
anyone other than as detailed by the Operating Guide for this product.  
STATEMENT OF REMEDY: In the event that the product does not conform to  
this warranty at any time while this warranty is in effect, warrantor will either,  
at its option, repair or replace the defective unit and return it to you without  
charge for parts, service, or any other cost (except shipping and handling)  
incurred by warrantor or its representatives in connection with the per-  
formance of this warranty. Warrantor, at its option, may replace the unit with  
a new or refur-bished unit. THE LIMITED WARRANTY SET FORTH ABOVE  
IS THE SOLE AND ENTIRE WARRANTY PERTAINING TO THE PRODUCT  
AND IS IN LIEU OF AND EXCLUDES ALL OTHER WARRANTIES OF ANY  
NATURE WHATSOEVER, WHETHER EXPRESS, IMPLIED OR ARISING BY  
OPERATION OF LAW, INCLUDING, BUT NOT LIMITED TO ANY IMPLIED  
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR  
PURPOSE. THIS WARRANTY DOES NOT COVER OR PROVIDE FOR THE  
REIMBURSEMENT OR PAYMENT OF INCIDENTAL OR CONSEQUENTIAL  
DAMAGES. Some states do not allow this exclusion or limitation of incidental  
or consequential damages so the above limitation or exclusion may not apply  
to you.  
LEGAL REMEDIES: This warranty gives you specific legal rights, and you  
may also have other rights which vary from state to state. This warranty is void  
outside the United States of America.  
PROCEDURE FOR OBTAINING PERFORMANCE OF WARRANTY: If,  
after following the instructions in this Operating Guide you are certain that  
the Product is defective, pack the Product carefully (preferably in its original  
packaging). Include evidence of original purchase and a note describing the  
defect that has caused you to return it. The Product should be shipped freight  
prepaid, by traceable means, or delivered, to warrantor at:  
Uniden America Corporation  
Parts and Service Division  
4700 Amon Carter Boulevard  
Fort Worth, TX 76155  
(800) 554-3988, 7:00 a.m. to 7:00 p.m., Central,  
Monday through Friday  
Uniden MHS550 Radio Owner’s Manual  
67  
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