Midland Radio Weather Radio 77 255ESP User Manual

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Where to locate your CB transceiver.  
Your new Midland CB is designed to be installed under the dash or  
vertically on a console of your vehicle.  
Safety and convenience are the primary considerations in deciding  
exactly where to locate your radio.  
Caution: Be sure that the unit is located so that it does not interfere with the  
driver or impair access to any controls. Connecting cables must be routed  
and secured in such a manner as not to interfere with the operation of the  
brake, accelerator or other controls. Interference from either the unit or  
connecting cables may contribute to the loss of control of the vehicle.  
Mechanical mounting  
Note: Extreme care should be exercised when drilling into dash to avoid  
damage to under-dash electronic ignition, cruise control, instrument and / or  
accessory wiring. Your unit must be mounted so as not to interfere with air  
bag (SRS) operation.  
Step 1: Heeding the caution, use the mounting bracket as a template for  
marking the location of screw holes under the dash. Use an awl, nail or  
other sharp pointed object to mark the metal.  
Step 2: Drill a 1/8” hole for each screw hole in the mounting bracket. Attach  
the bracket to the dash with the 3/8” Phillips machine screws provided.  
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Step 3: Locate and secure the radio into the mounting bracket allowing  
working space for later power connections.  
Power wiring (negative ground only).  
Step 1: If you have not determined whether your vehicle has a negative or  
positive ground, do so now. Then disconnect the negative lead from the  
battery to prevent short circuits that can occur during wiring.  
Step 3: With negative ground, connect the red wire (the one with in-line fuse  
holder) to either the ( a ) fuse block radio circuit (filtered), ( b ) cigarette  
lighter (unfiltered for noise), or ( c ) directly to the positive post on your  
battery.  
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(Usually, the fuse block is the most convenient connecting point. It is also  
possible to connect to the Accessory terminal on the fuse block, so that your  
CB automatically goes off when the ignition goes off, preventing accidental  
battery drainage.)  
The orange wire supplies power for the memory retention feature. For the  
memory retention circuit to operate the orange wire must be connected to  
power that is not switched off by the ignition switch. The connection point  
can be directly to the battery or an unswitched fuse on the fuse block.  
(Usually , the fuse block is the most convenient connecting point. It is also  
possible to connect the red wire to the Accessory terminal on the fuse block  
or ignition switch wo that your CB automatically goes off when the ignition  
goes off, preventing a battery drain.)  
Note: In many new vehicles the only circuit that has noise filtering is the  
radio circuit.  
Then tightly connect the black wire directly to the vehicle’s metal  
frame. A good direct metal - to - metal ground is essential for optimum  
performance. Installations using the cigarette lighter socket for power  
require an extra ground wire from the radio chassis to the vehicle if the radio  
is not fastened to a grounded part of the vehicle.  
Step 3: Plug - in the power cord to the receptacle provided on the back of the  
transceiver.  
Mounting the main unit.  
Step 1: Position the main unit between the bracket arms in line with the  
retention knobs. Set the angle for optimum operating comfort and  
accessibility.  
Step 2: Tighten the retention knobs.  
Installation of microphone hanger.  
Mounting holes are provided on the microphone hanger bracket. The  
bracket can be attached to the vehicle dash, or other convenient location.  
Antenna: How to select, position install  
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and tune the right one for you.  
Basically, you have two types of mobile CB antennas - full-length  
whip and loaded whip - and a variety of types of mounts (depending on  
where you locate your antenna) to choose from.  
Midland markets a broad line of high-performance antennas. The dealer who  
sold you your Midland CB can advise which type is best for you.  
Where you locate your antenna does make a difference.  
Some general rules for antenna location that can aid CB performance:  
1. Put your antenna mount as high on the vehicle as possible.  
2. The higher the proportion of antenna length that is above the roof, the  
better.  
3. If possible, mount the antenna in the center of whatever surface you  
choose.  
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4. Keep antenna cables away from noise sources, such as the ignition  
system, gauges, electric fuel pumps, etc.  
5. Make sure you have a solid metal - to - metal ground.  
6. Exercise care to prevent cable damage.  
Essentially, you have five location choices: the roof, gutter, rear deck, front  
cowl or rear bumper. Where you decide to locate your antenna will  
determine the type of antenna you install. Again consult your Midland CB  
dealer for advice and guidance, and measure your needs against the  
attributes of the various Midland antenna models he carries.  
Antenna installation.  
Follow the manufacturer’s installation instructions carefully.  
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Warning: Never operate your CB radio without attaching an antenna or with  
a broken antenna cable. This can result in damage to transmitter circuitry.  
Tuning your antenna.  
Some antennas are factory tuned. However, performance can usually be  
improved by slightly lengthening or shortening its length, using a Standing  
Wave Radio (SWR) meter. For the exact procedures to be used refer to the  
antenna manufacturer’s installation manual.  
You can buy an SWR meter separately or have your antenna checked by  
your Midland CB Dealer’s service department or a two-way comm shop.  
77-255ESP  
FUNCTION AND LOCATION OF CONTROLS  
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FRONT PANEL CONTROLS  
1. ROTARY CHANNEL SELECTOR: This easy to operate control allows  
changing of weather or CB channel, either up or down. This control will  
not operate when the channel “LOCK” function has been activated.  
2. MICROPHONE CONNECTOR: Plug in the supplied microphone to this  
connector. The collar ring has a screw on locking ring. Push the ring onto  
the units collar and screw on until it is tight.  
3. ON/OFF VOLUME: In the off position your transceiver’s power is off. Turn  
this control clockwise to switch on the unit and adjust the volume.  
4. SQUELCH CONTROL: Adjust this control until background noise just  
disappears. If the control is adjusted too far clockwise it may cause  
muting of weaker signals.  
5. RF GAIN CONTROL: This control adjusts the receiver sensitivity. Adjust  
the control for best reception of distant or local stations. Begin with  
control fully clockwise. To reduce reception of unwanted distant stations,  
turn control counter-clockwise until only desired stations are heard.  
6. MIC GAIN CONTROL: Rotating this control fully clockwise will result in  
the greatest microphone output. /rotating the control counter-clockwise  
reduces the microphone output, improving the sound in high noise  
environments. This control can also be used to control optional power  
microphone output.  
7. CHANNEL DISPLAY: LCD (liquid crystal display) read-out of selected CB  
or weather channel.  
8,11,13. M1, M2, M3 INDICATOR: These LCD boxes are illuminated when a  
memory button has been used to select the CB channel.  
9. TX INDICATOR: LCD indicator for showing the unit is transmitting.  
10. SCAN INDICATOR: This indicates channel scanning is operating.  
12. WX INDICATOR: When this indicator is illuminated it indicates your unit  
is in the weather receive mode. Weather channels are displayed.  
14. S/RF DISPLAY: LCD read-out of received signal strength and relative  
transmitter power output.  
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15. CB/WX: This button causes your unit to change modes between NOAA  
weather bureau receiver and CB operation.  
16. M1, M2, M3 BUTTONS: These buttons select CB channels  
previously  
set by the operator for quick recall. To store channels to memory:  
a. Select the desired channel using the rotary channel selector knob.  
b. Press and hold the memory button to be set for two seconds. Two  
beeps will sound when the channel is memorized.  
c. To recall a channel for use, press the desired memory button. The  
memorized channel will be selected and displayed.  
17. SCAN BUTTON: This button when pressed and when the squelch is  
closed causes the channels to be scanned until a signal opens the  
squelch. Pressing the button again cancels scanning.  
18. TALK BACK SWITCH: This switch allows the user to hear the  
transmitted audio as it is transmitted when it is set to “ON”. This  
provides the operator with a means to monitor the effects of  
microphone gain adjustment and the sound of special audio effects  
units.  
19. ESP SWITCH: Pressing this button controls the ESP2™ audio system.  
Channel noises are reduced and voices enhanced when ESP2™ is  
active.  
20. BRIGHT/DIM SWITCH: Pressing this button causes the backlighting of  
the display to switch between dimmed and full brightness.  
BACK PANEL  
ANTENNA CONNECTOR: Connect a standard 50-ohm CB antenna to this  
connector.  
S-METER JACK: A DC voltmeter may be connected to this jack for  
precision monitoring of received signal strength.  
EXT SPEAKER JACK: When a speaker is connected to this jack the  
internal speaker is by-passed. All received signals will be heard through  
the external speaker when it is connected. The speaker connected to the  
“EXT” jack should be rated at 8 ohms and 5 watts or more.  
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HOW TO OPERATE YOUR TRANSCEIVER FOR CB USE  
You should become familiar with the controls and complete the preceding  
installation instructions before attempting operation of your CB.  
1. Adjust the squelch control fully counter-clockwise  
2. Rotate the on/off volume control clockwise to turn the unit on. Adjust the  
volume for a normal listening level.  
3. Select the desired channel by the rotary channel selector. Rotate the  
squelch control until the background noise is just quieted. You are now in the  
receive mode.  
NOTE: If the channel will not change, check that the “  
4. To transmit press the PTT bar on the side of the microphone. Hold the  
microphone 2 to 3 inches from your lips and speak in a normal voice.  
5. To receive simply release the PTT bar.  
TO OPERATE YOUR TRANSCEIVER FOR WEATHER RECEIVE  
1. Follow steps 1 and 2 above.  
2. Press the “WX” button.  
3. Using the rotary channel selector select the active channel in your area.  
How ESP2™ works to make your CB sound better.  
The ESP2™ noise reduction system constantly monitors the signal strength  
and the type of noise present. When the signal strength is too low for good  
reception, the receiver sound is automatically adjusted to dramatically reduce  
the noise that comes through the speaker. While the noise is decreased the  
actual sounds you need to hear are increased.  
Skip interference can cause whistles and howling sounds. Electrical  
interference from power lines, ignition systems or other sources can produce  
low humming and buzzing noise. These high and low sounds are not  
needed for communications. ESP2™ can determine the difference between  
undesired noises and sounds you want to hear and filter the noises out.  
These results ESP2™ can accomplish without decreasing receiver range (it  
usually increases range). Most importantly, ESP2™ works by itself and does  
not need to be listening to other ESP2™ equipped CB’s to be 100%  
effective.  
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TECHNICAL SPECIFICATIONS  
GENERAL  
Frequency range ..........................................................................26.965-27.405 MHz  
Channels ..............................................................................................................40  
Modulation type ...................................................................................................AM  
Antenna impedance .......................................................................................50 Ohm  
Loudspeaker ...................................................................................................8 Ohm  
Microphone ..................................................................................................Electret  
Power Supply ....................................................................13.8 VDC negative ground  
RECEIVER ( CB, 26.965-27.405 MHz )  
Sensitivity at 10db S/N......................................................................................0.6 uV  
Selectivity .............................................................................................6 db @ 5 Khz  
Squelch range ......................................................................................0.5 uV-500 uV  
Audio output power ..................................................3.0 W @ 8 Ohm ( 10% distortion)  
Distortion at 1000 mV ............................................................................................3%  
Audio frequency response ........................................................................400-2400 Hz  
Intermediate frequency .......................................................I ° 10.695 MHz II ° 455 Khz  
Spurious response ................................................................ .............more than 45 db  
TRANSMITTER  
RF Output Power ................................................................................................4.0 W  
Frequency Tolerance .........................................................................................0.005%  
Harmonic Suppression ..........................................................................More than 60 db  
Modulation ...........................................................................................AM 90% ( ± 5%)  
SPECIFICATION - WEATHER RECEIVER  
CHANNELS  
00  
01  
02  
03  
04  
163.275  
162.550  
162.400  
162.475  
162.425  
05  
06  
07  
08  
09  
162.450  
162.500  
162.525  
161.650  
161.775  
Sensitivity _________________________________1.0 uV for 20 db  
Audio Power _______________________________3.0 W  
Audio Load ________________________________8 ohms  
Intermediate Frequency ______________________455 Khz  
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LIMITED WARRANTY.  
Midland Consumer Radio will repair or replace, at its option without charge, any Midland Mobile,  
Base Station, or full power Hand-Held Citizens Band transceiver which fails due to a defect in  
material or workmanship within one year following the initial consumer purchase.  
This warranty does not include any carrying cases, earphones, or telescoping antennas which  
may be a part of or included with the warranted product, or the cost of labor for removal or re-  
installation of the product in a vehicle or other mounting.  
Performance of any obligation under this warranty may be obtained by returning the warranted  
product, freight prepaid, along with proof of purchase date, to Midland Consumer Radio,  
Warranty Service Department 1670 North Topping, Kansas City, Missouri 64120, or to any “  
Midland Authorized Warranty Service Station,” or to the place of purchase ( if a participating  
dealer).  
Warranty information and the location of the nearest “Midland Authorized Warranty Service  
Station,” may be obtained by writing Midland Consumer Radio, Warranty Service Department.  
This warranty gives you specific legal rights, and you may also have other rights which vary  
from state to state.  
Note: The above warranty applies only to merchandise purchased in the United States of  
America or any of the territories or possessions or from U.S. military exchange. For warranty  
coverage on merchandise purchased elsewhere, consult the supplemental warranty information  
included with this product or ask your dealer.  
SERVICE  
If it ever becomes necessary to return your unit for service:  
Pack the unit in its original box and packing, Improper packing may result in damage during  
shipment. Include $7.50 for return postage and handling. (Note: Some states do not require you  
to pay for postage and handling).  
Include a full description of any problems. Include your telephone number.  
You do not need to return accessory items (brackets, screws, power cord, antenna, etc.) unless  
they may be directly related to the problem.  
Include a photocopy of the bill of sale or other proof of purchase showing the date of sale. This  
information must be included before warranty service can be considered.  
A flat rate of $45.00 will apply to repairs not covered by warranty. Send only cashiers check,  
money order or Master Card or Visa card number.  
MIDLAND  
CONSUMER RADIO  
1670 N. Topping  
Kansas City, Mo. 64120  
Phone 816-241-8500. Fax 816-241-5713 E-mail: [email protected]  
Printed in China  
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FCC Compliance Information  
Midland Citizens Band Transceiver  
Model 77-255ESP  
This device complies with part 15 of the FCC Rules. Operation is subject to the  
following two conditions:  
(1) This device may not cause harmful interference  
(2) This device must accept any interference received including interference that  
may cause undesired operation.  
For compliance information contact:  
Midland Consumer Radio  
1670 N. Topping  
Kansas City, MO 64120  
Tel: (816) 241-8500  
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