Linear Satellite Radio XT 4 User Manual

1. PRODUCT DESCRIPTION  
2. OPEN TRANSMITTER  
WARNING: THIS  
PRODUCT SHOULD NOT  
BE USED IN LIFE  
Linear’s Xtended Range FM transmitters and receivers are designed for use in various  
wireless remote control applications. When triggered with an external switch, the Model XT-4  
transmitter will send a 10 watt, 27.255 MHz, digital encoded, FSK modulated, signal to its  
companion receiver. The receiver will verify the digital code, activate its output, and trigger  
the remote device.  
XT-4  
SAFETY APPLICATIONS.  
FCC Rules allow  
unlicensed high-power  
transmissions at or near  
the operating frequency  
of this product which  
may interfere with, or  
even disable, normal  
operation of this radio  
device.  
XTENDED RANGE  
FOUR CHANNEL  
SUPERVISED  
REMOVE FOUR  
CASE SCREWS AND  
SLIDE OUT CIRCUIT  
BOARD  
The XT-4 transmitter has full supervision capabilities. If the “status” option is selected, the  
XT-4 sends hourly status signals to its receiver. If these signals cease, the receiver will  
indicate trouble by activating its status output after four hours. Contact supervision allows  
the receiver’s outputs to follow the transmitter’s inputs, staying activated as long as each  
transmitter input is activated. Alternately, an “auto-restore” option can be selected, causing  
a momentary receiver output each time any transmitter input is activated. Each input can be  
configured for either N/O or N/C contacts (switch selectable).  
STATIONARY  
TRANSMITTER  
For Use With Linear’s  
XR Series Xtended  
Range Receivers  
Power for the XT-4 transmitter can come from an external regulated 12 VDC power supply  
(Linear Model T-1224DC) or from a 12-volt battery. A 3-amp fuse protects the unit from  
reverse power polarity. The XT-4 draws about 15 μA standby, and about two amps during  
transmissions. If the power supply voltage drops below 10.5 volts, a low battery message  
will be included with any signal transmitted, causing the receiver’s low battery output to  
activate.  
REFERENCE  
CARD FITS IN  
1ST SLOT  
Two antennas (sold separately) are available for the XT-4. The Model ANT-1A is an 8-inch  
“rubber duck” antenna for short range applications (less than 1 mile). The ANT-1A requires  
a CON-180A (straight) connector to mate the antenna to the transmitter. For a right angle  
antenna, use the CON-180A plus the CON-90A.The Model ANT-2 is a 3-foot whip antenna  
for use in long range or difficult installations where more range from the XT-4 is required. A  
common 9-foot 1/4 wave CB whip antenna can also be used with the XT-4 for maximum  
range.  
Installation  
Instructions  
BOARD FITS IN  
3RD SLOT UP  
Two 8-position switches set the unit’s system code. This code must be matched in the XT-4’s  
receiver. There are 65,536 different system codes possible. The 4-position option switch  
selects the receiver’s bank (for XR-16 receiver only), and options for status and auto-restore  
transmissions.  
END CAP STAYS  
ATTACHED TO  
THE CIRCUIT  
BOARD  
CASE SCREWS  
The transmitter is housed in a rugged weather-resistant metal enclosure with a sturdy  
SO-239 antenna connector and a water-tight wiring strain relief bushing. During  
transmissions, the red operation indicator (visible through a window on the case) lights. If  
the XT-4’s input voltage is low, the indicator will blink during transmissions.  
(760) 438-7000 • FAX (760) 438-7043  
USA & Canada (800) 421-1587 & (800) 392-0123  
Toll Free FAX (800) 468-1340  
3. COMPONENT LOCATIONS  
4. INSTALLATION TIPS  
5. MOUNT TRANSMITTER CASE  
If using the ANT-1A antenna: For best range mount the XT/XR unit to a metal plate with a  
minimum size of 12" x 12". The ANT-1A antenna should extend above the mounting plate  
and be free of obstructions. If the ANT-1A antenna cannot be mounted in the open, consider  
using an extension coaxial cable with PL-259 connectors to move the antenna’s location.  
ANTENNA  
CONNECTOR  
(HIDDEN)  
3-FOOT  
ANT-2  
ANTENNA  
USE ANT-1A ANTENNA FOR  
SHORT RANGE APPLICATIONS  
(LESS THAN 1 MILE)  
SYSTEM CODE  
SWITCHES  
The XT/XR series of radios operate in the 27 MHz Citizens Band (CB) and may use any CB  
antennas or CB antenna accessories. Antennas, PL-259 extension cables and other  
adapters are available at Radio Shack® or other electronics stores.  
RIGHT ANGLE  
CONNECTOR  
UNIVERSAL  
(CON-90A)  
MOUNTING BRACKET  
8-INCH  
ANT-1A  
ANTENNA  
18-FOOT CABLE  
STRAIGHT-THRU  
CONNECTOR  
(CON-180A)  
SWITCH "B"  
SWITCH "A"  
USE ANT-2 ANTENNA FOR MAXIMUM  
RANGE OR DIFFICULT APPLICATIONS  
MOUNT UNIT WITH  
TWO BOTTOM SCREWS  
(DON'T INSTALL TOP  
SCREWS UNTIL WIRING  
IS COMPLETE)  
GOOD INSTALLATION  
BAD INSTALLATION  
OPTION  
SWITCH  
LINE-OF-SIGHT  
BETWEEN THE  
TRANSMITTER AND  
RECEIVER ANTENNAS  
WILL PROVIDE THE  
BEST RANGE  
RF TEST  
BUTTON  
ANTENNAS ARE MOUNTED  
VERTICALLY, ON HIGH POINTS  
OF BUILDINGS  
TRANSMITTING THROUGH  
STRUCTURES, METAL AND  
GEOGRAPHIC OBSTACLES WILL  
REDUCE RADIO RANGE  
TRANSMIT &  
LOW BATTERY  
INDICATOR  
MOUNT ANTENNA AS HIGH AS POSSIBLE  
GOOD ANTENNAS NEED GOOD GROUNDS  
N/O - N/C  
INPUT SELECT  
SWITCH  
OK  
METAL ROOF  
UNIT SHOULD BE  
FAIR  
MOUNTED IN SHELTERED  
LOCATION WITH ACCESS  
TO ANTENNA CO-AX AND  
POWER/SIGNAL WIRES  
3'  
POOR  
9 FEET  
AT LEAST 9 FEET  
ABOVE GROUND IS  
RECOMMENDED  
WHEN MOUNTING ON  
THE SIDE OF A  
STRUCTURE, USE A  
MINIMUM OF A 3-FOOT  
SPACER TO DISTANCE  
THE ANTENNA FROM  
THE STRUCTURE  
IDEALLY, A GROUND  
PLANE WITH A RADIUS  
OF NINE FEET MINIMUM  
IS DESIRED  
POWER & INPUT  
TERMINAL BLOCK  
POWER FUSE  
(3-AMP 3AG)  
ANTENNA LOCATION IS  
OF PRIMARY CONCERN  
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