Cobra Radio Communications - Recent Questions, Troubleshooting & Support


I have the same walkie talkies and on mine I can hold down the mode/lock button and it will come off of the Rx mode. Also, you should be able to press the talk button and it will come off of the Rx mode.

Cobra... | Answered on Mar 15, 2019


' Move the antenna angled forward ' Freightliner cascadias have powered driver and pass windows plus a thermostat inside the mirror arm ,The motors and electrical wires produce a EMF bubble that will disfigure the RF and absorb the energy. If you mounted the antenna to the mirrors arm with a bracket, just keep pushing it forward untill it passes the test.
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Cobra 29 LX... | Answered on Mar 12, 2019


Most likely, you have no 'voice' signal coming from the microphone. The MODulation control did not turn itself.
Check for signal from the shielded or white wire from the mike.
A capacitor could have shorted in the modulation limiter circuit, limiting the modulation to 0%.

Cobra Radio... | Answered on Mar 02, 2019


10 of what looks like AA NiCads. Open the cover and look.

Nickel Cadmium (NiCad) Batteries:
Batteries with 700 mAh minimum recommended.
Top Grade NiCad batteries can be ordered direct from Cobra. See page 22 for details.

Page 22 shows 10xAA batteries at $4.00 each. Try www.batterybuyer.com for a much better price on 10. Get Nickel Metal Hydride as well as they have no 'memory effect' that NiCads have.


https://manualzz.com/doc/1013137/cobra-36st-operating-instructions

Cobra Radio... | Answered on Mar 02, 2019


Try going to cbtricks.com. You'll find most of your answers there, and more.

Cobra Radio... | Answered on Feb 10, 2019


I am not sure just what is stuck, the button or the switch itself. If it is the button, try swabbing it with a Qtip soaked in Isopropyl alcohol to loosen any grease or dirt that may be causing the problem. You might want to open the case and remove the guts, being careful not to break any wires. If the button can be removed, clean it thoroughly and put the thing back together.

If the switch is shot, then you probably should just purchase another radio. Unless you are a micro surgeon, you probably won't be able to replace the switch yourself. A new radio is less expensive than taking yours to a shop for repair.

Cobra Radio... | Answered on Feb 10, 2019


What is the swr? This can impact the receiver. However, the tuning coils for receive and transmit are close to each other and someone most likely turned the receive coil instead of the transmit coil. The coils that are adjustable that affect receive are 13, 15 and 3. 3 is the coil that is close to the transmit section. You may want to have it realigned.

Cobra Radio... | Answered on Jan 31, 2019


pay and get it done right so the radio does not get destroyed.

Cobra 29 Lx... | Answered on Jan 17, 2019


Not setting your SWR meter up isn't the problem, but it could indicate that you have a problem with your antenna or feedline or connectors from the radio to the antenna. If your feedline is shorted, then you will not hear anything or be able to transmit.

Cobra Radio... | Answered on Jan 13, 2019


They are available on the net.

Here's a good link: http://www.cbtricks.com/radios/cobra/29ltd_29ltd_st_29wx_st/index.htm

I go here for almost all of the CB diagrams that I need. Unlike a few CB related websites, I have found this one to be very accurate.

Good Luck.

Cobra Radio... | Answered on Jan 12, 2019


First of all, unless you have an amplified base, the D104 will not work very well with a low impedance input, which is what most, if not all modern Cobra's use.

If your base is amplified, then check the internal battery. The pin out you are using sounds about right. You may also want to adjust the control on the bottom of the mic to see if that helps.

There is a possibility that your mic cartridge has been subjected to moisture. This will kill this type of mic cartridge and if it is fairly old, then you may have to replace the cartridge. New, but not original cartridges, are available on EBAY. I bought a few several years ago and they work very well. There are also Electret cartridges available, but they will not sound like the D104. It makes the D104 something completely different, but you might like the sound.

Cobra Radio... | Answered on Jan 12, 2019


Check the squelch setting on the receiving unit. If it is set to low, this can happen.

Usually after receiving something, the receiver will stay unsquelched as the open and release points on most squelch controls is different. If you set the squelch a little bit higher, this will not happen.

Cobra Radio... | Answered on Jan 12, 2019


I am not sure what your question is. However, it may be a problem with your microphone. These mics control the transmit and receive directly and not through a relay inside the radio. If the mic connections are incorrect or the cord has a problem, this type of problem can occur. Get it checked. These radio's are actually very good compared to many out there.

Cobra Radio... | Answered on Jan 12, 2019


There is no one thing you can turn to get better reception. If your reception is poor, then you have a problem with the components in the radio. When these things are manufactured, the receivers are tuned to the best possible settings. Getting in there and adjusting things without knowing what you are doing will just cause problems and adding to the expense of getting the radio operational.

I would suggest taking it in to a good technician. He can run a quick test to see if the sensitivity is up to snuff. I have worked on this type of gear for 30+ years and have a very good reputation in the radio community.

Cobra Radio... | Answered on Jan 12, 2019


It is very likely that the reverse polarity diode inside the radio is shorted, usually because the radio was connected up incorrectly.

Cobra 148 GTL... | Answered on Jan 12, 2019

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