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INSTR,INSTL,XT-4
LINEAR P/N: 215284 C
MATERIAL: 20 LB. MEAD BOND
SIZE: 8.500" X 11.000"
SCALE: 1-1
INK: BLACK
SIDE 1 OF 2 (FRONT)
XT-4
XTENDED RANGE
FOUR CHANNEL
SUPERVISED
STATIONARY
TRANSMITTER
For Use With Linear’s
XR Series Xtended
Range Receivers
Installation
Instructions
(760) 438-7000 • FAX (760) 438-7043
USA & Canada (800) 421-1587 & (800) 392-0123
Toll Free FAX (800) 468-1340
www.linearcorp.com
1. PRODUCT DESCRIPTION
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.
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).
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.
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.
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.
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.
2. OPEN TRANSMITTER
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.
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.
18-FOOT CABLE
UNIVERSAL
MOUNTING BRACKET
3-FOOT
ANT-2
ANTENNA
8-INCH
ANT-1A
ANTENNA
STRAIGHT-THRU
CONNECTOR
(CON-180A)
RIGHT ANGLE
CONNECTOR
(CON-90A)
USE ANT-1A ANTENNA FOR
SHORT RANGE APPLICATIONS
(LESS THAN 1 MILE)
USE ANT-2 ANTENNA FOR MAXIMUM
RANGE OR DIFFICULT APPLICATIONS
LINE-OF-SIGHT
BETWEEN THE
TRANSMITTER AND
RECEIVER ANTENNAS
WILL PROVIDE THE
BEST RANGE
ANTENNAS ARE MOUNTED
VERTICALLY, ON HIGH POINTS
OF BUILDINGS
TRANSMITTING THROUGH
STRUCTURES, METAL AND
GEOGRAPHIC OBSTACLES WILL
REDUCE RADIO RANGE
BAD INSTALLATIONGOOD INSTALLATION
AT LEAST 9 FEET
ABOVE GROUND IS
RECOMMENDED
MOUNT ANTENNA AS HIGH AS POSSIBLE
WHEN MOUNTING ON
THE SIDE OF A
STRUCTURE, USE A
MINIMUM OF A 3-FOOT
SPACER TO DISTANCE
THE ANTENNA FROM
THE STRUCTURE
GOOD ANTENNAS NEED GOOD GROUNDS
IDEALLY, A GROUND
PLANE WITH A RADIUS
OF NINE FEET MINIMUM
IS DESIRED
9 FEET
METAL ROOF
ANTENNA LOCATION IS
OF PRIMARY CONCERN
OK
FAIR
POOR
3'
REMOVE FOUR
CASE SCREWS AND
SLIDE OUT CIRCUIT
BOARD
CASE SCREWS
END CAP STAYS
ATTACHED TO
THE CIRCUIT
BOARD
BOARD FITS IN
3RD SLOT UP
REFERENCE
CARD FITS IN
1ST SLOT
SYSTEM CODE
SWITCHES
SWITCH "A"
OPTION
SWITCH
RF TEST
BUTTON
TRANSMIT &
LOW BATTERY
INDICATOR
N/O - N/C
INPUT SELECT
SWITCH
POWER & INPUT
TERMINAL BLOCK
POWER FUSE
(3-AMP 3AG)
ANTENNA
CONNECTOR
(HIDDEN)
SWITCH "B"
MOUNT UNIT WITH
TWO BOTTOM SCREWS
(DON'T INSTALL TOP
SCREWS UNTIL WIRING
IS COMPLETE)
UNIT SHOULD BE
MOUNTED IN SHELTERED
LOCATION WITH ACCESS
TO ANTENNA CO-AX AND
POWER/SIGNAL WIRES
WARNING: THIS
PRODUCT SHOULD NOT
BE USED IN LIFE
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.