My cobra 29 has low modulation. its not a mic problem because, the mic works fine on my other 29. with the dynamic turned all the way up, i only get half scale. i know it would normally peg the meter. any suggestions?
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Re: cobra 29 ltd modulation problen
You need to check the modulation on a modulation meter. Just because the meter doesn't peg, doesn't mean the modulation isn't working. Usally a meter pegging, means the swr's are too high or the meter is misadjusted. If in fact the modulation is low, their is a pot inside the radio (VR4) that will add gain to the modulation circuit. This setting is legally supose to be set by a qualified technician.
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Hi, Great radio when it works. If you have your settings on CB - not PA - -be sure that your Cobra has that setting selected. If CB -is selected and still nothing - be sure you have a working mic. These wires are fragile and can break internally. One easy way to check is to borrow a cobra mic or even drop by a CB repair shop and ask them to do a mic check with the mic - it is free.
If you have a bad mic replace it and all should be well. If your mic is good and it still doesn't transmit you will need to replace the finals in the unit. It is common that these burn out of you got too close to someone with too powerful a radio. The CB shop will need to look at it further and repairs should not be over about 40.00.
there are several things that might be responsible for the absence of
modulation when speaking into the microphone. a defective mic
cartridge, a broken audio or audio shield/ground wire in the mic cable
or mic plug or a defective push-to-talk switch in the mic itself, for
starters. if all is well here then the amc and transmitter speech
stages in the transceiver will have to be considered next. locate and
check with a known good mic wired for the radio in question. let me
first change mic ,maybe the problem are in this mic ,second if the mic is ok verify all capacitors in the modulation near of this ic ,if all are ok change the modulation ic and change it, i hope this help you