Linear XT-4 installation instructions Product Description, Open Transmitter, Component Locations

XT-4

WARNING: THIS

1. PRODUCT DESCRIPTION 2. OPEN TRANSMITTER

XTENDED RANGE FOUR CHANNEL SUPERVISED STATIONARY TRANSMITTER

For Use With Linear’s

XR Series Xtended

Range Receivers

Installation

Instructions

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.

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.

REFERENCE CARD FITS IN 1ST SLOT

BOARD FITS IN 3RD SLOT UP

END CAP STAYS

ATTACHED TO

THE CIRCUIT

BOARD

REMOVE FOUR CASE SCREWS AND SLIDE OUT CIRCUIT BOARD

CASE SCREWS

(760) 438-7000 • FAX (760) 438-7043

USA & Canada (800) 421-1587 & (800) 392-0123

Toll Free FAX (800) 468-1340

www.linearcorp.com

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.

3. COMPONENT LOCATIONS

4. INSTALLATION TIPS

5. MOUNT TRANSMITTER CASE

ANTENNA

CONNECTOR

SYSTEM CODE(HIDDEN) SWITCHES

USE ANT-1A ANTENNA FOR SHORT RANGE APPLICATIONS (LESS THAN 1 MILE)

RIGHT ANGLE CONNECTOR (CON-90A)

8-INCH

3-FOOT

ANT-2

ANTENNA

UNIVERSAL

MOUNTING BRACKET

18-FOOT CABLE

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.

SWITCH "A"

SWITCH "B"

ANT-1ASTRAIGHT-THRU

ANTENNACONNECTOR (CON-180A)

USE ANT-2 ANTENNA FOR MAXIMUM RANGE OR DIFFICULT APPLICATIONS

MOUNT UNIT WITH

TWO BOTTOM SCREWS (DON'T INSTALL TOP

GOOD INSTALLATION

LINE-OF-SIGHT

BETWEEN THE

TRANSMITTER AND

RECEIVER ANTENNAS

WILL PROVIDE THE

BEST RANGE

ANTENNAS ARE MOUNTED

VERTICALLY, ON HIGH POINTS

OF BUILDINGS

BAD INSTALLATION

TRANSMITTING THROUGH STRUCTURES, METAL AND GEOGRAPHIC OBSTACLES WILL REDUCE RADIO RANGE

SCREWS UNTIL WIRING IS COMPLETE)

OPTION

SWITCH

RF TEST

BUTTON

TRANSMIT &

LOW BATTERY

INDICATOR

N/O - N/C

INPUT SELECT

SWITCH

POWER & INPUT

POWER FUSETERMINAL BLOCK (3-AMP 3AG)

MOUNT ANTENNA AS HIGH AS POSSIBLE

	3'
AT LEAST 9 FEET
ABOVE GROUND IS	WHEN MOUNTING ON
RECOMMENDED	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

METAL ROOF	OK
	FAIR
9 FEET	POOR

IDEALLY, A GROUND PLANE WITH A RADIUS

OF NINE FEET MINIMUM

IS DESIRED

ANTENNA LOCATION IS

OF PRIMARY CONCERN

UNIT SHOULD BE MOUNTED IN SHELTERED LOCATION WITH ACCESS TO ANTENNA CO-AX AND POWER/SIGNAL WIRES