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I have a Cobra 142gtl with no audio on AM transmit but it does have audio on SSB transmit. My guess is I overdrove the Darlington pair direct injecting it years ago maybe? Would that take away my audio on SSB, too, though? just trying to think what I fried. Any help would be appreciated.

It's a Hy-Gain Super Penetrator 500 but the coax is fed at the match directly. Same location that the SO-239 was connected. Below Ch.1 the SWR starts climbing to about a 1.9:1. Same with above Ch.40. stays around 1.5:1 on the regular 40. All my grounds are good. No power lines or anything around...

Let me say first of all, I’m no tech. I don’t claim to be. I’m a hobbiest with an interest in modifying and building. This is the first amp protect I’ve ever taken on. I built this 16 pill amp from the plans found on this forum. They are the exact plans that I’ve found on other forums. The only...

I'm trying to figure out how to put variable carrier in this radio. i cant seem to find much info on the net. any help would be greatly appreciated..

im looking for some plans. ive never built one before and id like to give it a shot. i know that it can be pretty intensive when it comes to tuning and biasing. but ive gotta start somewhere. the reason i say 2SC2879's is because i already have 16 of them along with a 450 amp power supply. any...

is there a mod for this transceiver to operate on 11 meters? I've tried to do some research with no luck.

I'm looking to find a variable power circuit design that is compatible with direct injection on cobra 29 radios. The standard TIP120 produces a tone in transmission. I've also tried a tip29 as well. Is there a better design for variable carrier power? Any help would be awesome.

Im wanting to make a T/R switch so i can run my Kenwood R-1000 receiver in line with my station. For hifi purposes. Ive never made one before and this relay happens to be the only one i have laying around. Any help would be great

I have a cobra 29 that I've direct injected. When the radio is barefoot with no extra power, it works fine. As soon as turn on even a 2-transistor linear, I get a major squeal in the audio. I'm thinking it could be my variable dead key I have installed in the radio (tip29/25v 220uf...

I'm just hoping someone can point me in the right direction. I'm looking for plans on building any style beam antennas for 11-meter. I would like to build one, either Yagi or boxed style. i currently have a 5/8 ground plane about 60 ft in the air. I'm just looking to build something to play...

Ok..... This has me scratching my head. I was using the amplifier and all of a sudden it was like i unplugged it from the wall. i bled the tube and checked it, it checks good. i dont see any burnt components. i just dont know where to start to figure out what happened. when this happened, i had...

Anyone know what the mod is called and what it consists of? Of course it'll differ from radio to radio. I just wanted to do a little reading on it to have something to play with. Any help would be greatly appreciated. Thanks!

i have read a lot of opinians and write ups on the different methods to get this radio to swing. i have heard good things and bad things about the diode swing mod. what would you guys reccomend and how would you do it?

ive got a Kenwood R-1000 that i really want to run inline with my station but it doesnt have a place for a transmitter to hook up, so im wanting to make a transmit/receive automatic switch. Any help would be awesome. Thanks!

I got my hands on this radio, untouched. My main concern right now is doing an NPC mod or swing mod (witch ever this radio takes). The fact that this radio is SMT based parts is not an issue, I do have the proper equipment to do what I need to do with SMD. The only thing I could find on getting...

I am obtaining one of these radios and want to direct inject it. I did it to my Cobra 142 GTL some time ago and I have done the mod on a few Cobra 29's. Can someone help me with instructions for the 2527? I cant seem to find anything online by searching. Thanks so much for your help.

Hello all, I'm new here. I am on CBjunkies.com quite a bit and heard about this site through that forum. I'm needing help with installing a variable key in the above mentioned radio. I've built the mod (I've built many), I've just never put it in a 142GTL. I can't find info anywhere on where to...