Question about Radio Shack TRC-447 CB Radio

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Add more channels

How to go about adding more channels to trc 447

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  • Radio Shack Master
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Not worth the time or effort to do on this radio. years ago when it was the thing to do , yes but not today when you can get a radio with those channels already installed .

Posted on Oct 30, 2015

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Posted on Jan 02, 2017

  • 20 Answers

SOURCE: radio shack trc-447

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

Dennis

Posted on Aug 29, 2009

  • 3 Answers

SOURCE: I was wondering what was the range for the

Antenna :
-should be tuned, have good coax with no pinches, whip is centered over highest flat metal surface, no metal beside adjacent to whip, power is wired to battery direct, not to ignition or cigg lighter. whip is wiped clean of corrosion, whip is up, longer is better.
Praire City car-to-car: 15-20 km's
Praire Rural car-to-car: four-thirds over the horizon. Probably 60 km's.
Alot further over water.
Less within trees and mountains/valleys.
Google "Ham radio" & "ducting" "inversion" "skip" "sun-spots"
these refer to a condition where a radio signal getting stuck between the upper and lower atmospheres and travel intact for 1000's of km's (canada to mexico for example)

Posted on Sep 06, 2009

  • 86 Answers

SOURCE: I am looking for a manual for a TRC 474 CB Radio

what do you need to know about it

Posted on Oct 19, 2009

  • 773 Answers

SOURCE: i have no problems just would like to tune and

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

Posted on Dec 17, 2009

  • 141 Answers

SOURCE: tunning the antenna on radio shack cb trc-447

After installing the antenna, follow these steps to adjust the
standing wave ratio(SWR).
1. Turn on the CB.
2. Set S/RF/SWR/CAL to CAL.
3. Key the Mic and rotate SWR CAL so the meter points
to CAL.
4. Unkey Mic.
5. Set S/RF/SWR/CAL to SWR.
6. Key Mic again and note the actual measurement on
the SWR scale. Refer to the following table to interpret
the reading.

1:1 - 1.5 Great
1.5 - 2:1 OK
2:1 - 3:1 Not So Good
Higher than 3.1:1 Terrible

The ideal standing wave ratio (SWR) is 1:1, or a meter
reading of 1 on the SWR meter's top scale. A SWR ratio
of 1.5:1 to 2:1 is excellent for most mobile CB antenna
applications.

Check the SWR on Channel 1 and Channel 40
If the SWR is higher on 1, make the antenna longer
If the SWR is higher on 40, make the antenna shorter
Most antenna's are adjustable. Make small adjustments at a time.

Posted on Jan 30, 2010

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1 Answer

How do i install rfx75 to trc-447 cb radio


did you buy this in its own packaging or was it given to you.If you bought it there should be a diagram as to how to install it.

Oct 30, 2012 | Radio Shack TRC-447 CB Radio

1 Answer

MIC WIRING ON A TRC 447


this is one of those radios where the only one that works is the original.

Oct 13, 2010 | Radio Shack TRC-447 CB Radio

1 Answer

Looking for the manual for the Radio Shack TRC-447 CB Radio


Try this manual, it may or may not be the correct one, but it will be close enough to help you.

Jun 12, 2010 | Radio Shack TRC-447 CB Radio

2 Answers

Radio shack trc-447 cb. no controls function, radio turns on. Channel displays 8. switches do nothing,


The units have a reset code that protects the PLL brain from damage from voltage spikes. Ship it in and I'll get it back to normal function for you, providing the PLL has not been damaged.

Thanks,
Dodgem
www.Dodgem250.com

Feb 12, 2010 | Radio Shack TRC-447 CB Radio

1 Answer

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

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

3 Answers

RADIO SHACK TRC-447


A number of things....faulty speaker (you can scratch test this with a torch 1.5 volt cell....cell pos goes to 1 speaker terminal
and cel neg goes to other speaker terminal..you can conect it any way around with flying leads from the cell...just keep touching the terminal with one flying lead...you will hear a scratching sound in the speaker) have your mike checked...test the tx/rx relay on the circuit board for tx/rx switching, or, a failed
driver transister in the output stage....the list is many
Cheers flyingfox@people.net.au

Jun 21, 2008 | Radio Shack TRC-447 CB Radio

1 Answer

Trc 447- has power but no channel switching


Do you have your channel switch ( the first switch to the left as you look at the front of the radio ) switched to a normal position ? If so, you may have a bad switch. Another problem could be a bad PLL Chip which is the frequency control device. I hope this helps.

As for the Guest post on the TRC-466, I would install a new mic first, as if there is a problem in the mic or cord, it will cause the sound to quit. Other than that, it would be a good guess that the audio chip is bad. Good Luck
Ed
NC Electronic
Mills, Wyoming

Dec 17, 2007 | Radio Shack TRC-447 CB Radio

9 Answers

Mic wiring diagram


Want to wire cobra mic to a uniden washington radio

Nov 20, 2007 | Radio Shack TRC-447 CB Radio

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