Radio Shack 21-1703 A Marine Radio user guide

Aligned with the jacks notch.

Slide the microphone onto the microphone holder.

To disconnect the microphone from the transceiver, press the tab on the side of the plug. Then pull out the plug.

Caution: To avoid damaging the microphone,, never pull on the microphone

Connecting an External Speaker

Your transceiver also can be connected to an external CB speaker (not supplied).

Note: When you connect an external speaker, the CBs internal speaker disconnects.

The external speaker you use with the transceiver should have an impedance of

8 ohms and be able to handle 3 to 10 watts of power. The speaker cable must have a 1/8 -inch (3.5mm) plug. Your local RadioShack store carries a variety of speakers and cables to meet your needs.

To connect the external speaker to the transceiver, insert the speaker cables plug into the EXT SPEAKER jack on the back of the CB.

Using Vehicle Battery Power

To connect the transceiver to the vehicle battery power:

1. Connect the red wire (with the inline fuse holder) on the back of the transceiver to a point in your vehicles fuse block that has power only when the ignition is in the ACC (accessory) or ON position.

2. Connect the black wire to a metal part of the vehicles frame (chassis ground).

Caution: Do not connect the black wire to a non-metallic (plastic) part, or to any part insulated from the vehicles chassis by a nonmetallic part.

Using the Transceiver

Negative () black wire

Positive (+)

Although this transceiver is designed mainly for mobile use, you can also use it as a base station with an AC power source. For base station installation, you need these items (not supplied):

a 13.8V DC power supply that can supply at least 1.5 amps base station antenna

coaxial antenna cable and connector

Warning: Use extreme caution when you install or remove a base station CB

antenna. If the antenna starts to fall, let it go! It could contact overhead power lines. If the antenna touches a 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!

Follow these steps to install the CB as a base station.

Mount the base station antenna as described in its owners manual.

Connect the antenna to the ANTENNA jack on the back of the CB.

Connect the transceivers black power wire to the negative () terminal on the DC power supply.

Connect the transceivers red wire to the positive (+) terminal on the DC power supply.

Connect the DC power supply to a standard AC outlet.

Caution: Most 13.8V DC power supplies plug into a standard AC outlet to produce DC power. Before connecting your CB to a 13.8V DC power supply, read and follow the instructions included with the power supply.


Receiving Transmissions and Adjusting SQUELCH

Rotate SQUELCH fully counterclockwise.

Rotate VOLUME clockwise until it clicks to turn on the transceiver. The channel display lights and the channel appears, and the RX indicator lights.

Set OUT CH9 CH19 to OUT if you want to select a channel other than an emergency channel.

Rotate the channel selector until the display shows the desired channel.

Adjust VOLUME to a comfortable listening level.

To cut out background noise between transmissions, wait until there is no signal, then slowly rotate SQUELCH clockwise until the background noise

To turn off the CB, rotate otate VOLUME counterclockwise until it clicks. The display and indicators turn off.

Note: To receive very weak signals, turn SQUELCH counterclockwise. You will hear noise between transmissions, but you will also hear weak transmissions

(those not strong enough to break through a higher squelch setting).


Follow steps 1 5 in Receiving Transmissions and Adjusting SQUELCH.

To transmit, hold down PUSH TO TALK (PTT) on the microphone and speak. The

TX indicator lights. Release PUSH TO TALK when you ?nish transmitting. The TX indicator turns off.

To turn off the CB, rotate VOLUME counterclockwise until it clicks. The display and RX indicator turn off.

Selecting the Emergency Channel

Important: Channel 9 is reserved for motorist assistance and for reporting emergency information about accidents, hazardous road conditions, and so on. Always give emergency messages priority on Channel 9. To select the emergency Channel 9, set OUT CH9 CH19 to CH9. The selected channel number ?ashes on the display.

Channel 19 is used by truck drivers for general communication purposes. To select this channel, set OUT CH9 CH19 to CH19.

To select another channel, set OUT CH9 CH19 to OUT. The previously selected channel number appears on the display.


Operational Hints

Common Uses for CB Radios

Warn of traf?c tie-ups ahead.

Help truck drivers and delivery personnel learn road and traf?c conditions and get assistance in locating destinations.

Provide fast help in