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D-104 desk mic show good modulation on am but poor modulation on ssb compared to the factor hand mic. Has new battery, using it on a cobra 2000 base radio

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  • Andy Beck May 13, 2010

    Thank you I try that and get back with you thanks again

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  • 14,553 Answers

First: I am a old time CB operator and have repaired lots of the 2000 GTLS.

There are several versions as you know of the D-104 but if ok on AM but SSB is poor, it is more likely a problem with the radio.

What happens often in this radio is someone "removes the mod limiter" and there are several ways to do this. If done by removing the WRONG transistor or part, AM will be fine but SSB will be poor or distorted and may be described as CLIPPING etc.

The simple way to determine if the ALC has been defeated is to locate the VR (control) on the main board and turn it full left. If the radio still modulates on SSB the wrong modification was done.

It will work with certain microphones but when one with enough audio is connected it will clip and distort the audio.

The overall modulation is controlled by another VR marked AMC (auto modulation control).

You can attempt to connect the d=104 to another radio and see what happens---any of the older 148 radios should work with it.

Let me know what you find if you do what I suggest and I am here to help if you have questions.

73's......


SD TECH

Posted on May 13, 2010

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