Question about Radio Communications
Hi, I am working on a friends trc 424 that has a "talk back" problem. The radio transmits well with good modulation it just has this tx audio coming out of the internal speaker loud and clear problem. Where should I start to troubleshoot this problem?
Check for a resistor soldered across the P.A. jack and external speaker jack (solder side of the board) if you see one, remove it
Posted on Nov 26, 2013
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Posted on Jan 02, 2017
SOURCE: Radio Shack TRC-502 cb radio
Here is the owners manual I'l see if I can get my hands on a internal schematic
Posted on May 14, 2008
SOURCE: radio shack trc-502 cb radio
YOU CAN GET SCHEMATICS FOR THAT MODEL
I JUST LOOKED IT UP FOR YOU........THE BOOK IS SAMS PHOTO FACT...WEBSITE IS
THEY HAVE EVERY CB RADIO EVERY MADE
Posted on Feb 21, 2009
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
Hi and welcome to FixYa,
Initially, the speaker of course has been checked?
Offhand, would partial schematic of the mic and speaker section help?
Good luck and thank you for asking FixYa.
Posted on Dec 20, 2009
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