Question about Radio Shack TRC-447 CB Radio

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Trc 490cb radio

Ajusting modulation pot down

Posted by Cyril A.Durling on

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I MIGHT BE WRONG BUT I THINK THE $() ALREADY HAS AN ADJUSTMENT ON THE FRONT OF THE RADIO ITS CALLED THE MIC GAIN THIS CONTROL SHOULD LET YOU ADJUST THE LEVEL WITHOUT GOING INSIDE THE RADIO

Posted on Apr 06, 2013

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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.

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Got a radioshack trc-487 and I need some information on how to peak and tune it... wheres the modulation pot? which coils do I tune? and whats the numbers on the motherboard


  • There is no need to send the radio to some unsanctioned moonlighter.
  • I normally don't recommend clipping parts but for this radio there is not much else to do and it looks OK on an Oscilloscope too. Clip diode 205 to increase modulation. Then take a plastic flat tool and spread L 203 coils apart about a 1/8" each, nice and even and make sure they don't touch any metal.

  • Hope this helps.

Nov 16, 2011 | 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

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I have no problems just would like to tune and peak my trc-447


RV2 is modulation. turn that up to get full modulation. L9 and L12 is AM power.

Dec 16, 2009 | Radio Shack TRC-447 CB Radio

1 Answer

Clipping the Mod limitter


DO NOT CLIP THE LIMITER! You may wind up with splattering audio. The best thing you could do is find the modulation pot and turn it a bit to achieve more modulation. I am not familiar with your radio, so I could not tell you where that pot is. You may be disappointed in the results if you clip the limiter.

Jul 16, 2009 | Radio Shack TRC-447 CB Radio

4 Answers

Radio shack trc-447


According to the service manual for the TRC-447, the only adjustment is for "power" which is #L205. The only other step in the transmitter alignment is for the "S" meter.
On the Cobra, VR4 is AMC, L14,L13,L12 is AM power.

Jan 31, 2009 | Radio Shack TRC-447 CB Radio

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