Question about Cobra CB Radios

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Feedback i have a supertuned 29ltd. with stock mic all is well. with after market echo mic there is horrible feedback through truck speakers even with stereo turned off.?

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Assuming you have a good SWR, either ditch the power mike or the truck.

Posted on Sep 05, 2008

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My radio squeals with echo when my amps on


adjust your talkback to just open then set your echo to where you want it. Now turn your amp on and re-adjust both the talkback and the echo . If you have a speaker nearby the radio may be feeding back through it so move it away from your radio . Now start talking with the mic and adjust your echo because you should be able to hear yourself talk through your talkback.

Dec 21, 2012 | Galaxy Radios DX-959 40-Channels Base CB...

1 Answer

I have a Cobra 21- 23 channel CB and the wires pulled out of the plug. The mike wire has red,yellow black,blue,whiteand a ground. My plug has only four prongs to solder to. What four colors do I use?


Hello there
Here is the diagram for you
Cobra 29LTD, 29LTD ST, 29WX ST
Documentation Project
CBTricks.com

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cobra_29ltd_st_29wx_st_side.gif 29LTD ST Owners Manual pdf_1.gif
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29LTD ST Schematic Diagram pdf_1.gif
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WX Schematic Diagram pdf_1.gif
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29 LTD Classic Schematic Diagram pdf_1.gif(Courtesy of Rick Jackson)



Mic Wiring
Stock
1- Shield
2- Audio
3- Transmit
4- Receive
Astatic (4 wire)
1- Shield
2- White
3- Red
4- Black

Astatic (6 wire)
1- Shield & Blue
2- White
3- Red
4- Black
Yellow NC
Daiwa EM-500
Cobra CA Series

1- Shield & Black
2- Red
3- White
4- Blue
Galaxy DC-521S (4 wire)
1- Shield
2- Yellow
3- Red
4- Black
Galaxy CB-660EI
1- Shield & Black
2- White
3- Red
4- Blue
Sadelta
1- Shield
2- White
3- Brown
4- Green
Turner
1- Shield & Red
2- White
3- Blue
4- Black
Yellow NC

Nov 17, 2009 | Cobra 29 LTD CB Radio

1 Answer

I have a cobra 29ltd crome had echo board installed works good till i trun my la 900 on get feed back or squilling how do i fix


LA 900? I am guess that is a linear amplifier. If so are you running a power mic? You are probably getting RF feedback. You need to turn the gains on the radio and mic down.

Some things you can try. Hold the mic cord in your other hand in the center of the cord while you key it. some times this will shield it form stray RF.

You can also get a bunch of RF chokes from radio shack. They are little black things you snap onto wires that shield form RF. Put 2 near the plug, and 2 near the mic. That will help shield it from RF.

you will most likely still have to play with the gains on the radio and mic to find a sweet spot where it doesn't squeel.

Oct 06, 2009 | CB Radios

1 Answer

Lot of fed back


Make sure the antenna has a good clean ground. I know it sounds silly, but here's what's happening: You're getting RF feedback. If you don't have a good ground at the antenna, some of the RF travels back down the coax and makes the whole radio "hot". Some of that RF couples back into the microphone input, and causes feedback.

It's also possible that if your amp is really big, you're getting RF feedback directly from the antenna itself due to the really strong field.

You could try moving the antenna further away from the radio, or if that's not practical, some snap on ferrite chokes (available at radio shack) around the mic cable near where it enters the radio will probably solve the problem.

Oct 06, 2009 | Galaxy Radios DX-66V Base CB Radio

4 Answers

Feedback problems with astatic echo boards


This is a classic indication of a lost shield or ground connection in the mic circuitry. Double check these connections for good contact in the mic *and* the plug at the other end of the cable.

Check the grounding and SWR or "match"of the antenna system, too. A poor SWR (greater than 1.5:1 or 2.0:1) can cause the reflection of RF back to the radio. Modifications can increase sensitivity of the mic to this unwanted RF.

Sep 29, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

4 Answers

Connex 4600 Turbo


i have the same radio turn talk back off and there is enough power ull have talk back through you trucks radio speakers and it needs to be hooked up to the battery with at least 12ga wire

Feb 10, 2009 | Connex 4600 Base CB Radio

2 Answers

Galaxt 95t when i key the mic i get a squealing noise


Maybe check to see if the talkback is turned on.If so, turn it ouff you mght be getting feedback because the mic is too close to radio. Try external speaker, or a nise canceling mic (rk56,or astetic 623),

Also this is a realitive high power radio, so make sure you have a good match on the antenna and you arent starving the radio for power.

Wish you where more specific about the sqeal if it was feedback or echo was acting up. Alos built in roger beet makes tehe short squueal when unkeying mic.

Feb 03, 2009 | Galaxy Radios DX-95T Base CB Radio

1 Answer

I purchased a s500 Talk-Back speaker. There was not paperwork included with the speaker. Which wire is the PA. I am thinking it is the small red wire. Also: in order to use the Blue Tooth function of the...


It is the small red wire that goes in the PA, or you can just ground this wire. The bluetooth will work through the stock microphone.The external mic is for handsfree use.

Jan 15, 2009 | Cobra 29 LTD CB Radio

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