Question about Cobra 29 LTD CHR CB Radio Chrome Special Edition

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How do I disable talkback on my cobra 29 ltd radio

I want to disable talkback. how do I do this?

Posted by Anonymous on

1 Answer

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  • Cobra Master
  • 1,795 Answers

Check to see if its hook to the speaker jack. if it is just clip the resister. if its hooked to a dial then you are in hot water. follow the wires from those variables to see where they go . when you find the right one clip it.,no more talk back.

Posted on Nov 25, 2014

6 Suggested Answers

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Posted on Jan 02, 2017

Dodgem250
  • 68 Answers

SOURCE: Cobra 29 LTD Classic Operations Manual

For the operation manual, go to cobraelec.com or:

http://cobra.com/downloads/manuals/29LTDCLA.PDF


Thanks!
Dodgem

http://dodgem250.angelfire.com

Posted on May 10, 2008

  • 200 Answers

SOURCE: cobra 29 nw ltd won't transmit

Have you cracked the radio open yet?  check for loose connections etc.  get back to me if that doesnt yeild any results

Posted on Jan 22, 2009

  • 773 Answers

SOURCE: cobra 29 ltd classic antenna calibration ??

Wow. That's not at all a solution to what this guy is asking. And why all the caps??

The one point jm77437 has that is correct is that you do not set the radio, you set the antenna. The rest is blah blah.

Here is how you tune your antenna for you radio. First off it depends on what kind of antenna you have. most fiberglass antennas have a tunable tip to adjust the height of the antenna. Metal whips either have a collar at the base that the whip will either slide up or down in to adjust the height. The other type of metal whip's you have to physically clip to shorten the antenna, you must be careful with this type because once its clipped, that's it. You cannot add what you cut off.

I am going to give this example using a metal whip with an adjustable collar.

First after your radio is hooked up in the vehicle, drive to an open lot. Buildings and other structures can cause extra reflection. turn to channel 1. Flip the meter to CAL. Key the mic without talking. Now turn the CAL knob up until the needle reaches the little upside down triangle all the way to the right marked CAL. Now you have just celebrated your radio for your setup to measure you SWR. Now while still holding the key, flip the meter switch to SWR. The needle will move, and where it stops is your SWR reading. The lower the better. Anything under 1.5 is considered really good. But still, the lower the better.

Make note of what your SWR was on ch 1.

Now flip to channel 40. Repeat the SWR process. You must recalabrate each time you take a reading.

Now like jm77437 said. If your SWR reading is higher on 40 then 1, then your antenna is too long, and you must make it shorter. Loosen the collar and lower the antenna in the collar 1/4 inch at a time. check the swr each time you adjust the antenna.

If your SWR reading is higher on channel 1, then your antenna is too short. You must make your antenna longer. Do this by loossening the collar and pulling the antenna upward in the collar 1/4 inch at a time, again checking the swr each time you adjust the antenna.

What you want to achieve is having the same SWR reading on channel 1 and 40. then you have the best match you are going to get with that antenna.

If your swr is under 1.5 on all channels, you don't need to fuss unless you are a perfectionist. then by all means go ahead.

If your reading is higher then 3, or your ant light comes on, something is really wrong. Make sure your antenna is connected all the way, and the coax is not damaged.

Its important to have an appropriate SWR because if you do not, you are reflecting too much signal back into the radio, and eventually you will burn out your final transistor, and your radio will be toast.

Some tips: make sure you check the swr with the doors and windows shut. Make sure you are in an open lot. Remember to calabrate ecah time you take a reading. If you have had your radio peaked by a radio shop, and they have lowered your dead key, or have done a swing modification, then the meter in your radio will not work when taking an SWR reading and you will have to use an external meter.

Posted on Apr 24, 2009

  • 773 Answers

SOURCE: cobra 29 ltd classic antenna calibration ??

You should not calibrate the antenna before you install it on the car!! the antenna needs to be calibrated on the vehicle that it is going to be on. Type of vehicle, different mounts, and many other variables can change the amount of reflection you will get.

j0hn9999 did a much better job but left some info out.

Take your SWR readings on channel 1, then on channel 40.... NOW, if your SWR is higher on ch 40 then ch 1, then your antenna is too long and it needs to be shortened. Refer to the antenna instructions on how to shorten the antenna.

If your SWR is higher on ch 1 then on ch 40 then your antenna is too short. You must lengthen the antenna. Again refer to your antenna instructions on how to lengthen your antenna.

You must calibrate each time you take a reading.

Make sure your doors and windows are shut when taking a reading

Make sure you are in an open lot when taking a reading as buildings, trees and other structures can cause reflection and give you an inaccurate reading.

If you adjust the length of your antenna on another vehicle and then put it on yours, the SWR will be off. It will need to be tuned again.

An external meter is better then the one in the radio, but will need to be hooked up in the vehicle you have the antenna on.

If you are not running any kind of power, or do not have a swing kit installed, and the radio is stock, the meter in the radio is more then enough to get a correct SWR reading.

Posted on Apr 24, 2009

  • 773 Answers

SOURCE: Calibrate LTD 29Cobra classic

The misconception is that you can calibrate a radio. You do not calibrate the radio. You tune the antenna. The calibrate knob on the radio is to calibrate the meter in it so you can check the SWR.

This article will tell you everything you need to know.

Posted on Nov 20, 2009

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1 Answer

What is the talkback feature used for


it ids used to set your voice to any noise toy you may have installed you can hear the way its set so now there is no need to bother anyone with a radio check

Feb 13, 2014 | Cobra 29 LTD CB Radio

1 Answer

I dont think my talkback works on my cobra 29 ltd chrome. am i doing something wrong?


was it already installed or did you set it up ? If its a talk back that is an s.m.d. then it is usually controlled by the rf gain and the delta tune .Some will mount it to be controlled by the mic gain.Others try it out by attaching a resistor to the PA and external speaker plugs on the back of the radio. you may have to use a bigger resistor or even a smaller resistor to get it to work the way you want it to .

Apr 21, 2012 | Cobra 29 LTD CB Radio

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Cobra 29 ltd classic someone messed with all the lil screw ins and gave it to me, problem its having is , you hear some background white noise, try to key up but no TX? the dead key drops altho talkback...


That will need an oscilloscope to get it back right. we can fix for you. wouldn't cost much if all it is just out of alignment and nothing is broken...

Jan 02, 2011 | Cobra 29 LTD CB Radio

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When the mike is keyed to TR my audio comes thru the speaker. Cobra 29 LTD Classic. Best Regards Jim


If your voice is coming through the speaker when you transmit, it means you have talkback installed. If you don't like it, take it to a reputable CB shop and ask them to remove it.

Aug 06, 2010 | Cobra 29 LTD CB Radio

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I'm doing a talkback mod on a Cobra 29 LTD. I'm trying to wire it to the on/off channel 9, and I keep getting it turning onn all the time. When the switch is on or off, the talkback is still coming...


If you look at the tabs on the switch. You will have what looks like this.

* *
* *
* *

hook one wire to the center tab of one side. And then hook it to the top tab of the same side.

* *'''''''''''''''
* *'''''''''''''''
* *


Hope that helps.

Jan 26, 2010 | Cobra 29 LTD CB Radio

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Cobra 29 chrome


you could have a bad soilder but probably your voltage regulator went out.

Dec 15, 2009 | Cobra 29 LTD CB Radio

1 Answer

Want to get talkback in a cobra 29


When you key up the mic ungrounds the speaker so you don't hear anything through it, so to get talkback you're putting a 100 ohm 1, or 2 watt resistor between the switched side of the speaker and ground, now when unkeyed the mic grounds the speaker as usual, but when you key the resistor allows a bit of audio from the audio amplifier, not decoded RF, to still get through. I think the pa/ext spkr. jacks are a convenient place to connect it. You may decide to control talkback by running the circut thru a switch like brite / dim switch . Want less talkback, use more resistance, 150 ohm . Too much talkback can become feedback . I hope this helps, J

Nov 25, 2009 | Cobra 29 LTD CB Radio

2 Answers

I want talkback on my cobra 29ltd classic radio how do i do this myself


Open the case on your radio. Solder a 100 ohm resistor between the pa jack and ext speaker jack. You can add a switch if you like to turn it on and off. The lower the resistance, the louder the talkback.

Mar 30, 2009 | Cobra 29 LTD CB Radio

1 Answer

I have a Cobra 29 wx classic and i get talkback through the speaker, and it doesn't have talkback installed!! How do i change this and what is wrong!! The radio works awesome rx/tx, but it just has this...


Have you tried using a different mic that you know is working properly? If it still has feedback, then someone has installed talkback. Take the top off, check for a resistor between external speaker and pa speaker ports. Remove resistor if it is there and that should remove the talkback. Hope this was helpful.

Jan 15, 2009 | Cobra 29 LTD CB Radio

2 Answers

Scematic


Hi there!!

If you have an echo board what kind is it? I can give you the connections and where they go it just depends on which echo board you have!! I can also tell you where that talkback goes!! Let me know

Dennis

Dec 10, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

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