MTX-120 VHF Marine Transceiver
(190-1050)                 Preparation                Faxback Doc. # 39322

Charging The Battery Pack

The MTX-120 operates on a built-in rechargeable battery pack.  As supplied,
the battery pack is fully discharged.  You need to fully charge it before
using the radio.  Use only the supplied charger.

1.  Set the OFF/VOLUME switch to OFF.

2.  Connect the charger's plug to the CHARGE jack on the rear of the
    battery pack.

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

It takes about 10 hours to charge a battery pack that is fully discharged.
Do not use your transceiver while the battery pack is charging.

When the battery needs recharging, the TX/BATT indicator does not light
when you press the talk button.  Follow the above procedure to recharge the
battery pack.

Removing The Battery Pack

To remove the battery pack, hold the upper portion of the transceiver and
slide the battery pack in the direction of the RELEASE arrow.  You can
charge the battery pack while it is detached from the transceiver. You can
order extra battery packs from your local Radio Shack store.

Caring for Rechargeable Batteries

Rechargeable lead-acid batteries, such as your car battery, work better and
last longer if you keep them fully charged all the time.  However, nickel-
cadmium batteries, such as the battery pack used in this unit, react in the
opposite way.  They last longer and deliver more power if you occasionally
let them fully discharge.  To do this, simply use the transceiver until the
TX/BATT indicator does not light when you press the talk button. Then fully
charge the battery pack.  If you do not let nickel-cadmium batteries occa-
sionally discharge, they forget how much power they can deliver.  For exam-
ple, they might deliver only 10 to 20 percent of their actual capacity.

Using an External Power Source

You can operate your MTX-120 from the battery in your boat, if the boat has
a 12-volt, negative-ground electrical system.  Use only a Radio Shack Cat.
No. 270-1528 power cable with the MTX-120.

1.  Remove the battery pack.

2.  Select the adapter's blue tip and set the tip to positive (+).

3.  Attach the power tip to the DC jack on the bottom of the MTX-120.

4.  Plug the other end of the power cable into the boat cigarette lighter
    socket.

NOTE: We recommend you use the battery pack to power the radio. Use external
      power only for emergency communication when the battery pack is dis-
      charged.

Connecting The Antenna

To connect the supplied flexible antenna to the MTX-120's antenna terminal,
skip the slot in the antenna's connector over the protrusion on the antenna
terminal.  Then, rotate the antenna connector's collar until the antenna
locks into place.

Connecting an External Speaker

In a noisy area, a properly positioned extension speaker can make it easier
to hear the radio. We suggest our 8-Ohm extension speaker (Cat.No. 21-549).
Plug the speaker cable's 1/8" mini plug into the MTX-120's SP jack.  This
automatically disconnects the built-in speaker.

You can also use the SP jack for the connection of an earphone (such as our
Cat.No. 33-175) or mono headphones (Cat.No. 20-210).

Connecting an External Microphone

You can connect an optional external microphone (available by special order
from Radio Shack) to the MTX-120.

Connect the microphone's submini plug to the EXT MIC jack and its mini plug
to the SP jack. Connecting the external microphone disconnects the built-in
microphone and speaker and disables the talk button on the radio.  Use the
talk button on the external microphone to send and the speaker on the exter-
nal microphone to receive.  See "Operation Hints" on Faxback Doc. # 39324.

Attaching The Belt Clip

Use the two screws provided to attach the belt clip to the back of the unit.

Attaching The Hand Strap

Attach the hand strap by threading its attaching ring through one of the "ears" located on each side near the top of the unit.



(br/EB 5/6/97)

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