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Can someone help me mod my trc-503? i looked all over for mods for this model and have had poor luck. any help would be greatly appreciated. thanks in advance.

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You can try the foruns on www.qrz.com

Posted on Oct 24, 2009

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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.

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

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Where can I get a circuitboard schematic for my


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YOU CAN GET SCHEMATICS FOR THAT MODEL
I JUST LOOKED IT UP FOR YOU........THE BOOK IS SAMS PHOTO FACT...WEBSITE IS

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I need schematics for my radio shack trc-503 cb radio


Found what you need:

This comes in two parts -

first, this link:

http://www.eserviceinfo.com/download.php?fileid=34491

second, this link:

http://www.eserviceinfo.com/download.php?fileid=34492

save both to your desktop and execute part 1. It will create an Adobe PDF file. So make sure you have the Adobe PDF Reader installed - http://www.adobe.com/products/acrobat/readstep2.html

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