Radio Shack 21-1706 User Manual

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You can connect an optional microphone or earphone with a 

3

/

32

-inch (2.5mm) mini plug and a 

1

/

8

-inch (3.5mm) plug to 

the 

 jacks on the front of the CB. To avoid 

feedback, do not connect the microphone/earphone’s 

3

/

32

-

inch (2.5 mm) plug to only the 

 jack in CB mode.

To connect a headset with Voice Activated operation, we 
recommend you check the response sensitivity of the VOX 
circuit before installation. Different Voice Activation devices 
provide different performance results.

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Do not use an earphone with your transceiver when 
operating a motor vehicle in or near traffic. Doing so can 
create a traffic hazard and could be illegal in some areas.

If you use an earphone with your transceiver be very 
careful. Do not listen to a continuous broadcast.  Even 
though some earphones/headphones let you hear some 
outside sounds when listening at normal volume levels, they 
still can present a traffic hazard.

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1. Connect the red wire (with the inline fuse holder) on the 

back of the transceiver to a point in your vehicle’s fuse 
block that has power only when the ignition is in the 
ACC (accessory) or ON position.

2. Connect the black wire to your vehicle battery’s 

negative (–) terminal or to a metal part of the vehicle’s 
frame (chassis ground). 

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•

Do not connect the black wire to 
a non-metallic (plastic) part, or 
to any part insulated from the 
vehicle’s chassis by a non-
metallic part.

•

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

•

To prevent damage to the CB, 
be sure you connect an antenna 
and the microphone before you 
use your CB.

Using Vehicle Bat

tery

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