I have a Cobra 142GTL, when you key up and modulate it comes through the speaker like talkback anybody got any ideas what could be causing it?
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Cobra 142GTL speaker feedback (bleed) on modulation
- Thread starter spyedar7
- Start date
Need more info, if this is a new radio to you, maybe it has TalkBack mod installed. If it has worked fine until now, then started talking back, that's necessary info too. Have you tried another mic? If you want help, start from the beginning and tell everything, no matter how insignificant.
Do you have another mike to try? The switch in the mike shuts down the speaker while transmitting.
A quick test is to unplug the mike and see if you hear any receiver audio. If you do, this problem lies in the radio and not the mike.
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A quick test is to unplug the mike and see if you hear any receiver audio. If you do, this problem lies in the radio and not the mike.
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Well I plugged an external speaker in to see if it did it through the external and it didn't, and when I unplugged the external speaker the problem was no longer there
If the nut holding the external jack is loose and touches the metal surface of the chassis you'll get a symptom like this. That jack is mounted in a "shoulder" washer that insulates the jack's threaded bushing from the rim of the mounting hole. Another simple flat insulating fiber washer under the round nut insulates it from the chassis metal.
If that nut gets loose, the metal threaded bushing could touch the inside rim of the hole. A short from the jack's bushing to the chassis can do this.
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If that nut gets loose, the metal threaded bushing could touch the inside rim of the hole. A short from the jack's bushing to the chassis can do this.
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I just received a 142 with this same issue. It only happens using DC power. 3 different known good mics all the same. Turned with the Dynamic and it happens dieting peak modulation. Turn up the Dynamic and it’s more pronounced like talkback. Checked the Ext / PA jacks for any anomalies, but mine found. Gaskets in place! Nuts tight. Very very mind boggling.
I do remember seeing a disc cap on pin 3 of the mike socket that would do this. Changed it from a .01 or .02, whatever it was to a .001. Fixed the issue.
Taking the pin 3 wire loose from the from the socket would reveal if the socket is involved. And if taking the wire loose doesn't change it, the fault lies elsewhere.
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Taking the pin 3 wire loose from the from the socket would reveal if the socket is involved. And if taking the wire loose doesn't change it, the fault lies elsewhere.
73