HTX-404 440 MHz UHF FM Transceiver
(190-1140)                 Power                      Faxback Doc. # 6175

This section provides information on providing power to your HTX-404 and
also tells you how to use the HTX-404's accessories.

Power Sources

You can operate your HTX-404 from any of the following power sources:

  Rechargeable power pack (supplied with charger).

  Six alkaline AA batteries (using the supplied alkaline pack).

  Vehicle battery power (using an optional adapter).

  AC power (using an optional adapter).

Operating from the Rechargeable Power Pack

The supplied nickel cadmium rechargeable power pack provides 7.2 volts and
can operate your HTX-404 at 2.5 watts (typical power) with the LOW POWER
button out.  As supplied, the power pack is fully discharged.

Charge the pack for 10 hours using the supplied charger before you operate
the HTX-404 from the rechargeable pack.  Follow these steps to charge the
pack.

Note: To ensure a full charge, be sure the batteries are at room
      temperature (above 65 degrees F) when you charge them.  Cold
      batteries do not fully charge.

1.  If the pack is attached to the HTX-404, turn off the HTX-404.  Do not
    operate the HTX-404 while you charge the power pack.

    Note: You can remove the power pack from the HTX-404 to charge it, and
          operate the HTX-404 from one of the other power sources.

2.  Plug the supplied charger's barrel plug into the CHARGE jack on the
    back of the power pack.

3.  Plug the charger into a standard AC outlet.  The CHARGE indicator
    lights.

When power is low, BATT appears on the display when you press PTT. You can
buy extra power packs through your local RadioShack store.

CAUTIONS: To prevent permanent nickel-cadmium power loss, never charge the
          power pack in an area where the temperature is above 80 degrees
          F.

          Never use a charger other than the one supplied to charge the
          power pack.  Even chargers with the same voltage and current
          ratings could permanently damage the HTX-404 or the power pack.
          Order a replacement charger at your local RadioShack store.

This product contains a rechargeable nickel cadmium battery pack.  At the
end of the battery's useful life, it must be recycled or disposed of
properly.  Contact your local, county or state hazardous waste management
authorities for information on recycling or disposal programs in your area
Some options that might be available are, municipal curb-side collections,
drop-off boxes at retailers, recycling collections centers and mail-back
programs.

Using Alkaline Batteries

The supplied battery holder lets you power the HTX-404 from six AA
batteries (not supplied).  This battery holder supplies 9 volts and can
operate your HTX-404 at 4 watts (typical power) with the LOW POWER button
out. Follow these steps to load or replace batteries in the alkaline
battery holder.

1.  Hold the outer battery holder case and push down on the center of the
    battery holder.

2.  Remove old batteries, if necessary, and install six fresh AA alkaline
    batteries as indicated by the markings (+ and -) in the battery holder

3.  Press the battery holder into the battery holder case.

When power is low, BATT appears when you press PTT.

CAUTION: Never mix different types of batteries, and never mix old and new
         batteries.

Operating from Vehicle Battery Power

A DC power cord (Radio Shack Cat. No. 270-1533) supplies 13.8 volts
(typical) to your HTX-404 and can operate your HTX-404 at 5 watts with the
LOW POWER button out.  Follow these steps to operate from vehicle battery
power.

1.  Plug the power cord's barrel plug into the HTX-404's EXT DC jack.

    CAUTION: Never plug the power cord into the rechargeable power pack's
             CHARGE jack.  Doing so can damage the power pack and the
             HTX-404.

2.  Plug the power cord's cigarette-lighter plug into your vehicle's
    cigarette-lighter socket.

If the HTX-404 does not operate, remove the power cord's plug from the
cigarette-lighter socket and check the socket for debris.  Clean the
socket, if necessary, and try again.

Operating from AC Power

Operation from AC power requires an adapter or power supply (neither is
supplied).  Operate the HTX-404 from AC power using either the 1-amp 12
volt DC adapter (Cat. No. 273-1653) or our regulated 2.5-amp power supply
(Cat. No. 22-120).

The 1-amp adapter connects quickly and requires no soldering, but only
lets you operate your HTX-404 at 2 watts (typical power) with the LOW
POWER button out.  The 2.5-amp power supply operates your HTX-404 at about
5 watts with the LOW POWER button out and is better isolated from 60 Hz
noise.

To use the 1-Amp, 12-volt DC adapter:

1.  Connect the barrel plug with the tip set to positive.

2.  Insert the adapter's barrel plug into the HTX-404's EXT DC jack.

    CAUTION: Never insert the adapter's barrel plug into the rechargeable
             power pack's CHARGE jack.  Doing so can damage the power pack
             and the HTX-404.

3.  Plug the adapter into an AC outlet.

To use the regulated 2.5-amp power supply, you need the following
materials.:

  Power supply (Cat. No. 22-120)

  Two-conductor 18-gauge wire (cat. No. 278-567)

  DC power connector (cat. No. 274-1567)

  Soldering Iron and Solder

  Voltmeter or Multimeter

Follow these steps to power the HTX-404 from the regulated 2.5-amp power
supply.

1.  Cut the two-conductor wire to the length power cord you need.

2.  Strip about 1/2-inch of insulation from each end of both conductors.

3.  Solder one end of the wire to the DC power connector with the red lead
    connected to the center terminal, and the black lead connected to the
    outer casing.

4.  Melt a small amount of solder unto the other end of the wire.  Then
    connect the red lead to the power supply's (+) terminal and connect
    the black lead to the power supply's (-) terminal.

5.  Plug in the power supply and turn it on. Use the meter to confirm that
    you have correctly wired the power connector with the tip positive and
    the outer case negative.

6.  Turn off the power supply and plug the power connector into the
    HTX-404's EXT DC Jack.

    CAUTION: Never plug the power connector into the rechargeable power
             pack's CHARGE jack.  Doing so can damage the power pack and
             the HTX-404.

7.  Turn on the power supply.

Backup Battery

Your HTX-404 uses a lithium battery to keep stored options in memory when
you disconnect it from a power source.  This battery should last 3 to 5
years under normal conditions.  When the HTX-404 frequently displays ER1,
the backup battery needs to be replaced.

Note:  To clear the ER1 error message, reset the HTX-404.  See "Resetting
       the HTX-404".

The backup battery is not user-serviceable. Take the HTX-404 to your local
RadioShack store to have the battery replaced by a RadioShack repair
center.

(EB 3/2/98)

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