Question about Radio Shack TRC-447 CB Radio

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Radio shack trc-447

Looking to peak and tune my trc-447 looked all over the net can't find anything.
also i have a new cobra 29ltd classic in my van i want to peak and tune it also.
any help will be much appreciated, i am at a loss here thank you for all your help

Posted by mountaincraf on

  • mountaincraf Feb 03, 2009

    thank you so much for your help, i have been all over the place and you have put me in the right direction



  • jesse24spd May 13, 2009

    can u point me in the same direction?



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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.

Posted on Aug 28, 2009

  • Jeff Martin Jul 12, 2011

    Turns out that by clipping D 205, (limiter) and slightly stretching L 203, a 5-6 watt dead key can be attained, peak swinging forward to about 12. Still bumps slightly forward on RMS too. Wakes em right up, and they don`t appear too dirty on the scope.




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Hi there!!

For the TRC-447 the adjustments for AM POWER Adjust L-10 & L-11

For MODULATION Adjust RV-2 or CUT R222

For Cobra E-mail me


Posted on Aug 29, 2009

  • Mike Charette Apr 25, 2014

    there is no rv2 according to the schematics.




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  • 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.

Posted on Nov 03, 2011

  • OleBlue Lofton
    OleBlue Lofton Jun 03, 2015

    D205 is not correct. The modulation limiter is D203. I was only able to achieve a 4.5 watt dead key and an 11 watt swing.



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Where is vr2 or r222 on the trc-447? i can't find it

Posted on Jan 20, 2010

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