Question about Galaxy Radios DX-66V Base CB Radio

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Lot of fed back

I have a cobra 29ltd crome i had a echo board put in it does good till i turn my linear on then i get a lot of feed back or squiling

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  • 11 Answers

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.

Posted on Oct 10, 2009

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Posted on Jan 02, 2017

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2 Answers

I turn on my cobra 29LTD BT and theres is no RF gain nose what so ever. I put a new coax on and still nothing. The RF gain is alll the way up.The RF gain comes and gose.


firstly check your antenna feed (coax) for short with multimetre if this is ok problem might be your audio stage in the radio might need to be replaced hope this helps

Jan 03, 2011 | 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 | Radio Communications

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

2 Answers

Help with cb radio


Hello there
here is a link for the scematic ok?
best regards michael

  1. Cobra 29LTD ST, 29WX ST 29LTD ST Owners Manual. 29WX ST Owners Manual. DIAGRAMS. 29LTD ST Schematic Diagram ... WX Schematic Diagram. 29LTD, 29LTD ST, 29WX ST Factory Service Manual ...www.cbtricks.com/radios/cobra/29ltd_29ltd_st_29wx_st/index.htm - Cached

Sep 15, 2009 | Cobra 29 LTD CB Radio

3 Answers

What would be a good size linear to add to a cobar 29 that has been peek and tuned and echo board put in it


for a mobile or home base setup 100 - 250 watts is enough on all modes am / fm / ssb / cw, 1000w or 1 kw would be a overkill. what transmitters rely on is a tuned antenna and swr near 1:1 or 1:1.5, achieving a good tuned antenna will give you a clean output and good signal.

Jul 17, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29LTD CHROME low tx no mod, rx good low Vol, talkback good


1 why would you change the finals?? Have you checked you antenna? How are your SWR's? Crappy antenna's cause a lot of problems.

Use an external meter to see what the SWR is, and see what the output is PEP. If its low, then there is something wrong. If it is High, change the mic and turn up the dynamic all the way.

Next. Have you been messing around in there?? Tryin to get more wattage? You turned VR4? If you thought you were turning it up by turning it all the way to the right, you turned it all the way down. Turn it all the way to the left.

Jun 05, 2009 | Cobra 29 LTD CB Radio

1 Answer

Scematic


Hi and welcome to FixYa,

Pls click on the schematic diagram for a Cobra 29LTD.

Good luck and Thank you for using FixYa. Happy Holidays.

Dec 11, 2008 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 Ltd


Hi,

Appreciate the direct "Ask Me" again.

The initial posting would still hold true, best would be:
  • remove TR18;
  • replace 2SC2069 with 2SC1969; and
  • adjust L12, 13 & 14.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Sep 07, 2008 | Cobra 29 LTD CB Radio

1 Answer

Feedback


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

Aug 23, 2008 | Cobra Radio Communications

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