Question about Radio Shack TRC-447 CB Radio

1 Answer

I had great out out sound on the radio going through and external speaker, i also had a very loud out put on the PA now the sound is barly comming out of both what happened?

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  • Radio Shack Master
  • 1,795 Answers

You may have turned on the agc circuit. if you over power it the circuit will come on and limit your audio in and out.

Posted on Dec 26, 2013

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Posted on Jan 02, 2017

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SOURCE: Noise in Audio

hi dude

Posted on Mar 06, 2008

Mechanic688
  • 204 Answers

SOURCE: CB radio PA speaker

Freddy, hello. The first thought that comes to mind with your problem is that if the 29 is an older model, the audio circuit or audio chip could be tired. If your talking about the receive volume being low thru the ext. speaker, then there is a rx. wire inside the mic cord. When it breaks, it cuts the volume in about half. The rx. wire is on pin # 4. Maybe your using the wrong ohm value speaker. You need 4 or 8 ohm. If you are refering to the outgoing modulation being real low, then the radio mod. has just been turned down to 50-60%. That's about all I've got for now, not being able to actuallly see the radio,,, Have a good day, and let me know how it goes,, Mechanic

Posted on Oct 31, 2008

Mechanic688
  • 204 Answers

SOURCE: PA speaker quiet

I think this is a double post,, am I right Freddy??? Mechanic

Posted on Nov 01, 2008

  • 4 Answers

SOURCE: no audio out of the radio's speaker

The problem could be a range of things. Generally these radios use the same amplifier for the PA and receiver output. If the radio is receiving (usually the needle on the meter moves) then it may be bad contacts on the relay. Before pulling it apart check that the squelch setting is set to low and the RF gain is high. Check that the external speaker jack is not damaged (internally). If all seems OK visually try to connect one wire from a speaker (8 ohms) to the chasis of the radio and then use the other wire to probe different wires that are connected to the external speaker jack and on board speaker to see if you get an output there.

Posted on Sep 07, 2009

dburns60
  • 410 Answers

SOURCE: Cobra 29LTD speaker inop....No audio at all.

There are some different things you could be facing like:
the speaker sound being cut-out by the mic switch, but my first guess is the switch in the external spkr. jack being faulty. Here is a schematic for you.

http://xbones_antennas.tripod.com/id21.html

Posted on Apr 12, 2010

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1 Answer

Not loud enough, is there anyway i can make it louder or do you guys have a website to buy parts?


We don't have any website here. CB radios typically do produce limited volume. If you have tried different external speakers already, and you are confident you have a good antenna setup, it seems you may need an amplifier. However consider all this first -

http://www.cbradiomagazine.com/Articles/Amplifier%20Series/Amplifiers%20Part%201.html
.

Jan 08, 2016 | Radio Communications

2 Answers

Why doesn't my radio operate in the "PA" mode?


Some radio's do this (specifically Uniden) for some unknown reason. Ideally you plug a speaker into the PA output and when you switch to PA mode, the CB transceiver part should turn off and only your voice should come out of the PA EXT speaker to make it act like a personal megaphone.

Jul 07, 2014 | Uniden Pro505xl 40 Channel Cb Radio

1 Answer

Uniden 40-Channel CB Radio (PRO505XL) "PA" acts like an extra external speaker!


because when you switch to PA it is because you are on the outside of your vehicle.When another party calls you ,you can hear them and then go to your vehicle flip it to cb and talk to your party.

Jul 07, 2014 | Uniden Pro505xl 40 Channel Cb Radio

1 Answer

CB Plays out PA Speaker


it is possible that the PA speaker output is intended for a normal (unpowered, unamplified) speaker. Perhaps in your case the audio you hear from the PA speaker is only signal leakage from the PA Speaker connection.
To know.. connect a regular speaker to the PA speaker connector (any speaker, home audio, old car 6x9....). If the PA works and drives the temporary speaker OK, and you hear no CB receive, then the PA output is for a normal speaker, with leakage of CB audio.
It is just a guess, but easy to try.

May 04, 2014 | Radio Communications

1 Answer

CB in Receive Mode Plays Out the PA Speaker


no,its supposed to work that way so you can monitor it while you are outside your vehicle.

May 04, 2014 | Radio Communications

2 Answers

CB Plays out PA Speaker


Are you following the user manual that came with the radio?
NB-ANL/CB/PA SWITCH: When the switch is in the NB/ANL position, the Noise Blanker (NB) and Automatic Noise Limiter (ANL) circuits are activated.
The Noise Blanker is very effective in eliminating repetitive impulse noise such as ignition interference. In the CB position, the PA function is disabled and the radio will transmit and receive on the speaker that is connected. In the PA position,
the radio acts as public address amplifier. Your voice will come out of the speaker that is plugged into the PA. SP. jack on the rear panel. The radio does not operate when you are in the PA mode.

When you plug a speaker into the ext. jack does it kill the radios internal speaker? It should until you unplug it; if not and you are following the about you may have a wiring issue with the jacks.

May 04, 2014 | Radio Communications

1 Answer

Wiring a pa


right next to the external out put of the external speaker is a similer plug .It says PA. set the plug in the outlet and push on it to make sure it goes in and now you have PA.

Aug 03, 2012 | Cobra 19 Ultra II CB Radio

1 Answer

Have a uniden pc 68 elite it seems everything works the whene transmitting the needle moves a. but it has no volume it makes no noise i have tried a different mic i have put a new ext speaker on it and it...


Could be audio chip.
  • Insert external speak jack into pa port.
  • Turn volume down
  • Switch cb/pa switch to pa
  • speak into mic
if you are getting audio from speaker ......chip is fine.

Jan 04, 2011 | Uniden Bearcat Pro PC68Elite 40-Channels...

1 Answer

Cobra 29LTD speaker inop....No audio at all. Speaker Ohms out ok as do speaker leads from board to speaker. External speaker jack is inop. PA works in PA and CB modes. Other than speaker issues, radio...


There are some different things you could be facing like:
the speaker sound being cut-out by the mic switch, but my first guess is the switch in the external spkr. jack being faulty. Here is a schematic for you.

http://xbones_antennas.tripod.com/id21.html

Apr 12, 2010 | Cobra 29 LTD CB Radio

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