Question about Radio Shack TRC-447 CB Radio

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Trc 447- has power but no channel switching

Well my cb radio used to work. I'm still able to get power but it wont let me change channels. What could the problem be?

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Re: 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
NC Electronic
Mills, Wyoming

Posted on Jan 07, 2008

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check to see if the channel 9- 19 switch it set on those channels.

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I was wondering what is the best settings and what can i do to make sure im getting full use of my radio shack trc-44

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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

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.

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When mic is keyed, TX light illuminates but power meter does not

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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 can conect it any way around with flying leads from the cell...just keep touching the terminal with one flying 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

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