HTX-242 Two-Meter Mobile Transceiver
(190-1126)                 Installation               FaxBack Doc.  #19152

Connecting the Microphone

Plug the microphone's connector into the microphone jack, secure the
microphone holder to either the left or right side of the transceiver,
then clip the microphone to the holder.

Mounting the HTX-242 in a Vehicle

When you select a mounting location for the HTX-242, be sure:

    You can easily reach it

    No wires or cables will interfere with the vehicle's operation

    It is not directly in front of heating vents

    All wires will reach their connection points

CAUTIONS:  To avoid damaging your vehicle's electronic systems, contact
           your vehicle's manufacturer before you install the HTX-242 to
           find out about the proper transceiver mounting locations,
           antenna locations, and power and antenna cable routing
           guidelines.

           Do not apply power to the transceiver until after you properly
           mount and connect an antenna.

Use the supplied screws, metal washers, bracket, rubber washers, and
mounting knobs, to mount the transceiver.

Connecting an Antenna

You can connect a variety of antennas for both mobile and base-station use
(see "Using the HTX-242 as a Base Station" on this document.  Each type of
antenna has its benefits.  Choose one that best meets your needs.

When deciding on a mobile or base-station antenna and its location,
consider the following:

    The antenna should be as high as possible on your vehicle or house.

    The antenna and antenna cable should be as far away as possible from
    sources of electrical noise (ignition systems, power cables, and so
    on).

    The antenna should be vertical.

    The antenna should have an SWR of less than 1.5:1.  An SWR of 1.8:1 or
    greater can prevent the HTX-242 from performing to its specified
    ratings.

After you select an antenna, follow its mounting instructions.  Then route
the antenna cable from the antenna to the HTX-242 and connect it to the
antenna connector.

Connect the antenna to your HTX-242 using 50-ohm coaxial cable.  The cable
should end in a PL-239 connector.

CAUTIONS:  To prevent damage to your HTX-242, you must connect an antenna
           to it before you operate it.

           Do not run the cable over sharp edges or moving parts that
           might damage the cable.

           Do not run the cable through the engine compartment or other
           areas that produce extreme heat.

           Check with your vehicle manufacturer for antenna cable routing
           guidelines.

Connecting to your Vehicle's Power

Follow these steps to power the HTX-242 in your vehicle.

1.  Connect the black wire to your vehicle battery's negative (-) terminal
    or to a metal part of the vehicle's frame.  Be sure the metal part is
    not insulated from the vehicle's frame by a plastic part.

2.  Connect the red wire to a source of voltage that turns on and off with
    the ignition and that can handle the transceiver's 10-amp maximum
    power draw.

NOTE:  You might need to connect the red wire directly to the battery if
       you experience ignition noise.

Using the HTX-242 as a Base Station

Although we designed the HTX-242 primarily for use as a mobile
transceiver, you can also use it as a base station.  To do so, you need
these items:

    13.8-Volt DC regulated power supply that can supply at least 10 amps
    continuous power

    Base station antenna

    50-ohm coaxial antenna cable and connectors

Follow these steps to connect the HTX-242 as a base station.

1.  Mount the base station antenna according to its instructions.

    WARNING:  For your safety, follow all cautions and warnings included
              with the base station antenna.

2.  Connect the antenna cable to the antenna jack on the back of the
    HTX-242.

3.  Connect the black power wire to the power supply's negative (-)
    terminal.

4.  Connect the red power wire to the power supply's positive (+)
    terminal.

5.  Connect the power supply to a source of power.

Using the HTX-242 with Packet Radio

You can connect your HTX-242 directly to a packet radio terminal node
controller.

NOTE:  You can purchase an 8-pin plug that matches your HTX-242's MIC jack
       at your local Radio Shack store (Cat. No. 279-440).

Connecting an External Speaker (Optional)

You can connect an external speaker to your HTX-242.

Use an 8-ohm communications or PA speaker that can handle 5 or more watts
of power (such as Radio Shack Cat. No. 21-549).  The speaker's cable must
end in a 1/8-inch plug.  Simply plug the speaker cable into the HTX-242's
EXT. SP jack.

If your vehicle has a cassette player, you can easily connect your
transceiver to your vehicle's audio system using a CD-to-cassette adapter
and a mono-to-stereo audio plug.


(SP/ir-05/15/96)