Difference between revisions of "CB Radio Modulation Modification"

Revision as of 23:50, 3 July 2016

Look for the AMC Adjustment point (modulation potentiometer) or modulation adjustment pot. Use a reference for your brand and model of radio to identify the correct potentiometer.

You will typically turn the adjustment counter-clockwise to increase the modulation. You can start by turning the adjustment counter-clockwise until it stops to achieve full modulation.

At this point you will want to speak into the microphone and if the reading constantly peeks you are probably over modulated. Back off the modulation until speech is no longer distorted.

Use the built in display to determine what your modulation swing is before and after the modification.

Some models the adjustment is going to be clockwise to increase as opposed to counter clockwise.

Another modification that can easily be made by adjustment of a potentiometer is to increase transmit power. This potentiometer is typically located close to the amplification transistor often referred to as the final stage amplification transistor or the final.

If you overdrive the final amplification transistor you may damage it.

Adjustments should be made with a non-conducting ceramic screwdriver.

CB radio people tend to refer to the potentiometer or pot as a "can" and they will talk about tuning the cans.

CB radio people tend to refer to the final stage transistor as a "pill" and will talk about burning out the pills.