Question about Cobra 29 WX NW ST 40-Channels Base CB Radio

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Installing a astatic echo board in a cobra 29 nw please help

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Posted on Jun 14, 2009

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I have a cobra29 wx nw st. its been peaked and tuned, an echo board installed, and soundtracker override when i key up if my mic gain is over 1/4 the way up it makes an awful racket what do i do?


is there talk back installed? if so its probably too loud. You are getting feed back. The talk back should be low, just enough to hear it to check echo. 470 ohm resistor is perfect.

Jan 04, 2010 | Cobra 29 WX NW ST 40-Channels Base CB...

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

1 Answer

Installing an Astatic Echo Board in a Cobra 148


There should have been instructions that came with your reverb board. You are going to need to drill another hole in the case of the radio, or find a control where you can install a dual control knob onto.

Your reverb board is likely going to need 8v, so you will need to locate that off the logic board, likely from the frequency synthesizer. The the audio lines from the mic, or the output of mic amp, are going to be redirected to the reverb, and the output of the reverb feed back to where the wires were removed from.

If I recall correctly, the 148 is a bit of a bear to work with, not much room inside. You will likely have to get creative in placement of the reverb board itself. Make sure to wrap well so that it doesn't get tossed around and break something inside.

Sep 15, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Looking to install astatic echo board in uniden PC78XL


usally on most radios you will unplug the wire that comes from the number two mic plug. you will hook you sheid witch is the 2 little black wires from the echo board to number one mic plug. then the two wires will go to wire you unplug and the other one will go to number 2 mic plug.

Jul 04, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Trying to hook up a astatic echo board


Looking at the plug from inside the radio, with the nub facing downward, from right to left you have pin1 pin2 pin3 and pin4.

1-Shield
2-Audio
3-Transmit
4-Receive

Colors are

1- Red
2-White
3-Blue
4-Black

Mar 24, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Trying to wire up a atatic echo board in a cobra


Take the mic plug apart and look at it the wire with the shield around it is the audio, then look and see which pin it hooks to.

Feb 21, 2009 | Cobra 29 LTD CB Radio

1 Answer

Echo on cobra 29


When you purchase an echo board, the instructions come with them.

If you need any help, don't hesitate to email me at rollincbmods@yahoo.com

Dean Pitts
Rollin CBs

Aug 25, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Echo on a cobra 29 nw


When you purchase an echo board, the instructions come with them.

If you need any help, don't hesitate to email me at rollincbmods@yahoo.com

Dean Pitts
Rollin CBs

Aug 25, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Cobra 29 wx st


Take it back to your 'pro'. Let him fix it.

Jun 22, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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