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Looking for mods for a trc 503

I know its not much of a radio but i enjoy working on them. i cant seem to find any resources though. can anyone help?

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Have you tried www.cbtricks.com

Posted on Oct 31, 2009

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1 Answer

As this radio shack trc 503 cb radio will only transmit but it has loss it audio sound and no noise as nobody seems to don't why this has loss it audio and soun


If its RX audio you have lost then your audio chip is faulty or the speaker, try an external speaker or new internal speaker

Oct 24, 2013 | Radio Shack TRC-503 CB Radio

4 Answers

Radio Shack TRC-502 cb radio


Here is the owners manual I'l see if I can get my hands on a internal schematic

http://support.radioshack.com/support_electronics/doc62/62220.pdf

May 14, 2008 | Radio Shack TRC-503 CB Radio

1 Answer

TRC 503 Mods


do you mean the trc 503 or the 503A . one is a hand held the other is a CB which neither one has any good mods except for turning it up a little for power and a little modulation.

Mar 25, 2013 | Radio Shack Radio Communications

1 Answer

I have a Realistic TRC-457.It has very low power and modulation.It is a virgin radio other than someone has replaced the final and driver.I noticet that I cant set the modulation and swr levels on my dosy...


How many watts does it do? If it swings say: 1.5 watts up to 4 watts, someone has installed a swing kit which has a very small carrier. In AM, carrier is not important, its modulation and swing that makes it loud. If its low Audio modulation then it may be that final has went bad too.

May 31, 2011 | Radio Shack TRC-503 CB Radio

1 Answer

How do u attach a pa to the trc 503


Hi! Thomas

There is NO capability to use a PA speaker with the TRC-503.

Sorry.

Feb 28, 2011 | Radio Shack TRC-503 CB Radio

1 Answer

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

WWW.SAMSWEBSITE.COM

THEY HAVE EVERY CB RADIO EVERY MADE

GOOD LUCK

Jun 22, 2008 | Radio Shack TRC-503 CB Radio

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