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No modulation when transmitting - Radio Communications

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No modulation could be a problem with your mic or the factory setting inside the radio. Radios are set at about 50 to 80% modulation from the factory. This is adjustable in most radios. Search mod adjustment on XXX radio and you should get info as to where the mod adjustment is located inside your radio. Turning it all the way up will not hurt it but it could cause some distortion if turned too high. Up is turning it counter clockwise.
Modulation is not shown on all built in "S" meters, just power. There are bench meters which show both power and modulation available for about $50 and up.

Posted on Feb 28, 2011

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Posted on Jan 02, 2017

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1 Answer

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I am not an expert but I think there can be little or no modulation of the carrier wave unless there is an audio input to the modulator. Like any audio amplifier a transmitter modulator (amplitude modulation) is quiescent without an input.

If the modulation amplifier and audio pre-amp are working and modulating the carrier wave and the antenna is ok then audio modulated radio frequency must be being transmitted.

It would be an extremely good quality CB that had a modulation meter. Mostly all they have is a meter giving an indication of the rf power being sent to the antenna and that rf (radio frequency) power would be the same whether modulated or unmodulated.
The modulation envelope, incidentally, is traditionally viewed or measured with an oscilloscope.

The indicated rf power could be verified using a field strength meter but the only practical way to discover if a standard CB is transmitting modulated rf is to listen to the transmission on a suitable receiver. If the squelch is turned down it will be obvious if the rf carrier wave is being received as the hiss would be silenced. If no audio is received it can be assumed none is being transmitted.

I suggest you try another microphone and lead and if that doesn't work it is clearly a job for a repair shop.

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Initially, pls confirm that there is modulation (transmit audio). The reason I asked is if IC4 (TA7222P) is blown, then the radio would have no audio amplifier which would explain no receive audio. Additionally, the final and pre-final (TR15 & 15) gets is modulated TX+12 through D8 from T1 which in turn is the output of IC4 through C48.

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Good luck and Thank you for using FixYa. Happy Holidays.

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