HTX-404 440 MHz UHF FM Transceiver
(190-1140) Preparation Faxback Doc. # 6177
When you first use the HTX-404, if the display shows ER1, or if you ever
want to reset the HTX-404's options to the factory defaults and clear all
memories, follow these steps.
WARNING: This procedure clears all stored information
1. Turn off the HTX-404.
2. Press and hold down F + CLR. Then turn on the HTX-404.
Connecting The Antenna
You must connect an antenna to your HTX-404 before you transmit. Your
HTX-404 comes with a flexible antenna. The HTX-404's antenna connector
makes it easy to connect other types of antennas. RadioShack stores sell
a discone antenna (Cat.No. 20-013) and a center-loaded telescoping whip
antenna (Cat.No. 20-006) you can use with your HTX-404.
To use the supplied antenna slip the antenna's connector over the BNC jack
and twist the antenna to lock it in place.
To use an external antenna, attach the appropriate connector adapter to
the end of the antenna cable. Then slip the connector over the BNC jack
and twist the connector to lock it in place.
WARNING: When installing or removing an outdoor antenna, use extreme
caution. If the antenna starts to fall, let it go! It could
contact overhead power lines. If the antenna touches the power
line, contact with the antenna, mast, cable or guy wires can
cause electrocution and death! Call the power company to remove
the antenna. Do not attempt to do so yourself.
Activating Additional Frequencies
As factory set, your HTX-404 operates from 440 MHz to 450 MHz. To set the
HTX-404 to operate from 430 MHz to 450 MHz, press and hold F + A while you
turn on the transceiver. Then hold in F while you press 9876. The HTX-404
beeps when you press the last digit.
Notes: This modification does not affect the HTX-404's performance in any
way other than increasing the frequency coverage. The additional
frequencies cover areas not normally used in repeater operation.
You must reset the HTX-404 to restore the original coverage.
Attaching The Belt Clip
You can attach the provided belt clip to your HTX-404. Use the supplied
screws to attach the belt clip on the back of the HTX-404 near the top.
Attaching The Hand Strap
Loop the supplied hand strap's key ring through the hand strap tab.
Using an External Microphone
You can use an external microphone with your HTX-404. When you connect an
external microphone the internal microphone does not work but the internal
PTT (push to talk) is not affected. If your microphone has a 3/32 inch
(2.5 mm) sub-mini plug, plug the microphone cable into the HTX-404's MIC
jack.
Using an External Speaker
In a noisy area, an external speaker positioned in the right place might
provide more comfortable listening. RadioShack stores sell an extension
speaker (Cat.No. 21-549) and an amplified communications extension speaker
(21-541). Plug the speaker cable's 1/8 inch (3.5 mm) mini plug into the
HTX-404's SP jack. This disconnects the internal speaker.
For the most efficient operation when you carry the HTX-404 on your belt,
connect a combination speaker/microphone (such as Cat.No. 19-310) to your
HTX-404 and hang the speaker/mic on your collar.
If your vehicle's stereo has a front-panel auxiliary input jack, you can
listen to your transceiver through your stereo's speakers by plugging one
end of a 1/8 inch stereo cable (Cat.No. 42-2387) into the stereo's jack.
Then plug the other end of the cable into a mono-to-stereo audio plug
(Cat.No. 274-368) and insert that plug in your HTX-404's SP jack.
If your vehicle has a cassette player, you can connect your HTX-404 to
your vehicle's audio system using a CD-to-cassette adapter (Cat.No.
12-1951) and a mono-to-stereo audio plug (Cat.No. 274-368). Simply insert
the adapter in your vehicle's cassette player, connect the adapter's plug
to the mono-to-stereo plug, insert the plug in the HTX-404's SP jack, and
turn on your cassette player.
Using The HTX-404 with Packet Radio
You can connect your HTX-404 directly to a packet radio terminal node
controller as follows:
MIC Jack
_____________ / _______________ _____________
| |-----------| |--------| |
| HTX-404 | | Terminal Node | | Personal |
| | | Controller | | Computer |
|_____________|-----------|_______________|--------|_____________|
\ RS232C
SP Jack
Resetting The HTX-404
When you first use the HTX-404, if the display shows ER1, or if you ever
want to reset the HTX-404's options to the factory defaults and clear all
memories, follow these steps.
WARNING: This procedure clears all stored information.
1. Turn off the HTX-404.
2. Press and hold down F + CLR. Then turn on the HTX-404.
Using The Light
Press L on the side of the HTX-404 to turn on the display light for about
5 seconds. To turn off the light sooner, press L again. If you want the
light to stay turned on, press F + L at the same time. The light stays on
until you press L again or turn off the HTX-404.
(RLR/EB 3/2/98)