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Trc 424 with tx mod coming out of the internal speaker.

Hi, I am trying to repair a trc 424 for a friend. When the radio is in tx transmit modulation is heard loud and clear from the internal speaker. The radio transmits well with good modulation it just has this tx mod in the speaker problem. Where should I start troubleshooting?

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 773 Answers

SOURCE: Cobra 29LTD CHROME low tx no mod, rx good low Vol, talkback good

1 why would you change the finals?? Have you checked you antenna? How are your SWR's? Crappy antenna's cause a lot of problems.

Use an external meter to see what the SWR is, and see what the output is PEP. If its low, then there is something wrong. If it is High, change the mic and turn up the dynamic all the way.

Next. Have you been messing around in there?? Tryin to get more wattage? You turned VR4? If you thought you were turning it up by turning it all the way to the right, you turned it all the way down. Turn it all the way to the left.

Posted on Jun 17, 2009

  • 1 Answer

SOURCE: I have a TRC 502A

My Radio Shack TRC-503 has the same problem. Did you solve the problem? My radio had a bad speaker, and it worked great with another speaker hooked-up. But after installing a new speaker today, it started doing feedback during transmit, no matter what speaker I use.

Posted on Feb 24, 2013

  • 54 Answers

SOURCE: Feedback through speaker during transmit

ARE YOU TALKING ABOUT THE INTERNAL SPEAKER IF SO THE WIRES TO THE SPEAKER INSIDE ARE BEING SHORTED TO GROUND TOUCHING SOMETHING METAL

Posted on Feb 27, 2013

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