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Mysterious Cobra 29 LTD not working!

jluck001

Newbie
Joined
Jun 13, 2020
Messages
1
So my friend from work gave me his older Cobra 29 LTD (The one with the mic plug coming out the side instead of front) for use in my Jeep and I was super excited to try out this new piece of kit but there is a big problem. Once all hooked up the radio does not receive anything, no static, nothing. When I key the mic, the SWR meter doesn't move at all and the TX/RX light along with the channel display goes completely black. I also cannot hear anything coming out of my PA speaker when switched to PA. I opened the radio and took a look inside (pictures below) and saw what looked to be modifications to the main board but I am not sure if it was just built that way. Has anyone else had this problem?

Any input is greatly appreciated!
 

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mmckenna

I ♥ Ø
Joined
Jul 27, 2005
Messages
12,902
Location
SNCZCA01DS0
Those don't look like modifications. The first photo appears to be two capacitors that are there to suppress some noise on the power input.
Not sure what the second photo is, but a capacitor to ground.
Third photo is a resistor, but looks stock.

If the radio won't do anything when you key up:
Make sure you are feeding it with 12volts DC off your vehicle battery or a power supply large enough to supply 3 or 4 amps.
Make sure you have a properly tuned antenna installed.
Make sure you are using the correct microphone.

If it still doesn't work, you may have to see if someone knowledgeable in these radios can assist. Or just ditch it and buy a new CB for $40.00.
 

RFI-EMI-GUY

Member
Joined
Dec 22, 2013
Messages
3,836
Hard to say. My first thought was wrong or bad mike because the T/R switching sometimes all happens in the mike. But you should have some lights on the panel. What about the fuse? I agree those are factory parts not some goofball golden screwdriver mods. It is worth more unmodified even if broken.
 

iMONITOR

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Premium Subscriber
Joined
Sep 20, 2006
Messages
7,893
Location
MACOMB, MI.
When I key the mic, the SWR meter doesn't move at all and the TX/RX light along with the channel display goes completely black.
When you keyed up the mic you had an appropriate antenna or dummy load on it, right? What are you using for power?
 

RFI-EMI-GUY

Member
Joined
Dec 22, 2013
Messages
3,836
Where are you getting power to run this radio? The newer Jeeps require some $35 adaptor to get switched power from the ignition.
 

spongella

Member
Premium Subscriber
Joined
Feb 21, 2014
Messages
725
Location
W. NJ
Wondering if he found the problem. Excellent suggestions have been posted.
 
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