Question about Cobra 29 LTD CB Radio

1 Answer

Cobra 29 cb radio not responding with 1 thru 22 channels.

Channels 23 and up working find. antenna and mic check out ok.

Posted by Anonymous on

1 Answer

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  • Cobra Master
  • 1,795 Answers

Is it used? if so it may have been hacked for more channels and no one finished the work.If its new send it back to cobra .its under warrenty

Posted on Nov 02, 2014

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Posted on Jan 02, 2017

  • 86 Answers

SOURCE: i have a cobra 29 ltd cb radio> when i click

It's the mic or radio like you said try this
unplug the mic the RX (receive) will stop
working there are 4 pins take a small screwdriver short one pin at a time to the
side of the plug an watch the meter if you
find one that makes the meter jump over
then your mic is bad.last if that don't work
then short 2 pins together and not to the side
of the plug. there is nothing that will hurt you
or the radio.hope this helps.I have worked
with radios and outher electronics for over
22 years. Good Luck

Posted on Sep 10, 2009

  • 92 Answers

SOURCE: i have an old 23 channel cobra 29. it lights up but does nothing

It is not a dirt issue, the final transmitter is bad. This is caused normaly from a bad antenna or wire going to the antenna. These can be replaced. There is one big on near the back of the radio, 3 prong black transistor connected to a piece of metal (heat sink), unsolder the old one and obtain an exact replacement. (perhaps radio shack or repair shop), solder the new one in. This will sometimes be screwed to the heatsink on the very back of the board connected to the rear of the radio.

Before reconnecting the radio have the antenna checked for damage.

Posted on Sep 25, 2009

  • 23 Answers

SOURCE: an old cobra 29 23 channel Cb that has no audio or key up

This is a typical indication of the finals being blown. Probably have to take it to a shop, but it would be expensive compared to the value of the radio

Posted on Nov 04, 2009

SOURCE: Wiring Johnson Microphone to cobra 29 CB Radio

Use trial and error systemathically. If still refuses to work, mike and radio aren't compatibles.

Posted on Nov 23, 2009

  • 219 Answers

SOURCE: 29 LTD CB Radio: whats the color to number wiring for cobra mic...

This is for a cobra CA50 mic
1-sheild
2-white
3-red
4-black

Posted on May 09, 2010

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Lx29 blue tut. Locked in 9/10 mode. How do I reset it?


PDF]EIi?tr,iitts - American Radio History

www.americanradiohistory.com/Archive-Radio.../90s/.../EN-1993-11.pdf
Nov 5, 1993 - 64 AUTOPATCH SELECTOR FOR RADIO AMATEURS ..... Memorymodes can store readings while ..... est way to do it is to base the circuit .... width (with increasing values of CB), .... Electronics Engineers' Book Club, Blue Ridge Summit, PA 17294- ...... lock onto the 19 -kHz pilot sub- ...... manually reset.using fgets to read one line at a time - Experts Exchange www.experts-exchange.com > Questions
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Cobra 29 LTD Classic CB Radio - YouTube? 5:42https://www.youtube.com/watch?v=vJle8vlsWLcAug 20, 2013 - Uploaded by C B WorldIn this product review we look at the Cobra 29 LTD Classic CB radio and ... Just like in the manual. most channels are below 3. a few are not.Cobra 29 LTD Classic Troubleshooting - iFixithttps://www.ifixit.com/.../Cobra_29_LTD_Classic_TroubleshootingiFixitCobra 29 LTD Classic is not transmitting or receiving. The Antenna is not tuned correctly; The Radio is not in CB mode; The Radio is on the wrong channel; The ...Marine Radios ' Cobra Electronics Corporation

Jan 07, 2016 | Cobra Radio Communications

1 Answer

When i try to calibrate my cobra 29 ltd classic the needle will not go to the right


make sure you have your radio set on CAL and then adjust the knob that says adjust .Turn it all the to the right then bring it back to the set point on the dial then un key the mic,move the switch to SWR , key the mic and that is your reading. Do this on channels 40 - 1 then 19. Make sure you write down the readings for each channel. The adjust your antenna from there.

Jul 05, 2014 | Cobra 29 LTD CB Radio

1 Answer

I have no reaction from channels 1 thru 22.


sounds like the radio is out of alignment or the pll has failed. have the radio serviced

Feb 06, 2014 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Cobra 29 cb not receiving station 1 thru 22


Cannot even begin to answer . It is complicated and tedious process but it all has to do with your processor and that its not obtaining the correct frequencies via the oscellator. In other words its in your vco section of the radio so get a schematic and a block diagram and go for it.

Feb 06, 2014 | Cobra Radio Communications

1 Answer

Schematic diagram of cobra 148 gtl cb radio china made


  • Locate the MB8719 chip that is right behind the channel selector. Wire a SPST switch from pin 10 to ground and another from pin 11 to pin 12.


  • Channel Chart
  • Position 1: sw1 down, sw2 down
  • NORMAL CHANNELS

  • Position 2: sw1 up, sw2 down
  • 15=26.815 20=26.885 25=26.925 30=26.985(ch3)
  • 16=26.835 21=26.895 26=26.945 31=26.995(ch3A)
  • 17=26.845 22=26.905 27=26.955 32=27.005(ch4)
  • 18=26.855 23=26.935 28=26.965(ch1)
  • 19=26.865 24=26.915 29=26.975(ch2)

  • Position 3: sw1 up, sw2 up

  • 1=27.605 6=27.505 10=27.555 14=27.605
  • 2=27.455 7=27.515 11=27.565 16=27.475
  • 3=27.465 8=27.535 12=27.585 20=27.525
  • 4=27.485 9=27.545 13=27.595 23=27.575
  • 5=27.495

  • Position 4: sw1 down, sw2 up

  • 1=27.605 11=27.725 21=27.855 31=27.955
  • 2=27.615 12=27.745 22=27.865 32=27.965
  • 3=27.625 13=27.755 23=27.895 33=27.975
  • 4=27.645 14=27.765 24=27.875 34=27.985

Nov 09, 2011 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

I have the cobra 29 classic k40 antenna. The antenna light comes on when keyed up on 40 but only channel 40. I used an swr meter and that's as good as I can get. Is this ok?


Normally the swr should be set on the centre channel so if you have 40 channels you should set it on channel 20. This is because as you move away from channel 20 the swr rises slightly more for each channel away from the 20. If you set it on channel 40 you'll have twice as much swr on channel 1 more than if you set it on channel 20. If the swr metre shows 1:1 (i.e. doesn't move up at all) on channel 20 the rest should be ok since the antenna was designed for CB. You should however check that the needle showing reflected power doesn't go above 2.5

Jul 29, 2010 | Cobra 29 LTD CB Radio

1 Answer

An old cobra 29 23 channel Cb that has no audio or key up


This is a typical indication of the finals being blown. Probably have to take it to a shop, but it would be expensive compared to the value of the radio

Oct 29, 2009 | Cobra 29 LTD CB Radio

4 Answers

I have an old 23 channel cobra 29. it lights up but does nothing


It is not a dirt issue, the final transmitter is bad. This is caused normaly from a bad antenna or wire going to the antenna. These can be replaced. There is one big on near the back of the radio, 3 prong black transistor connected to a piece of metal (heat sink), unsolder the old one and obtain an exact replacement. (perhaps radio shack or repair shop), solder the new one in. This will sometimes be screwed to the heatsink on the very back of the board connected to the rear of the radio.

Before reconnecting the radio have the antenna checked for damage.

Sep 20, 2009 | Cobra 29 LTD CB Radio

2 Answers

Twilli811@hotmail.com


check the SWR's on antenna. check microphone it has to work for the RX to be heard. cbshop

Sep 06, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

2 Answers

Cobra 29 nw ltd classic


Hello candy_72_99,

Hello candy_72_99,

If I am correct what you are saying is that your radio has poor modulation? ok. First I need you to run two tests for me.

1) Power output Test: connect a power meter to the antenna jack and the other connector of the meter to the antenna, Key up the mic and record the power reading is should be 4W PEP or 36.02dbm

2) Then I want you to take an oscilloscope and put a 1khz tone in to the mic while measuring the RF output at 100% modulation the wave form should not clip.

If these two test are good then your modulation is ok. What I believe you are asking for is more power or better power efficiency.

Try to tune your antenna for 1:1.0 or 1:1.2 SWR with a SWR meter this should deliver the full power to your antenna.

I hope this helps

Thank you,

Shuttle83

Nov 04, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

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