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Nice to still see interest in this antenna, this may be of some help http://www.worldwidedx.com/cb-antennas/34419-save-penetrator-500-antenna.html

Ok problem solved! I will post this in case anyone else if having the same problem. A local asked me to fix his cobra 2000 that had no receive audio so I was able to fix that but then noticed when I talked on the mic I could hear myself coming through the speaker (I thought someone had added...

Audio feedback After looking around in the radio at this point I am certain that it does NOT have talkback so it’s so a problem with the radio, here is the symptom. Feedback through the speaker when you talk (but only on AM) I have had a few cobra 2000’s over the years and I seem to remember...

Thanks for the input I will take a closer look at that this evening..

The board on the back with the speakers and PA jacks looks to be stock but I will pull it part later to make sure something on the flip side has not been mod’ed . The mic plug look to have been changed what is the set up for mic plug talkback? I am trying to figure out the mod so I can un do it .

Cobra 2000 speaker feedback problem I am working on a cobra 2000 and it appears to have talkback installed I am trying figure out how to disable it. I have done some searching but as of yet I have not found any talkback info on the cobra 2000, anyone ever play with this mod on this radio?

I have been using one of these for about a year now works great to run amplifiers, cheap to Compared to a regular 100amp supply. PowerMax PM3-100 PM3 Series 12v Power Factor Converter 100 Amps Trailer Camper RV

I had placed the order with Coppers today I guess i will find out on Monday if they have it still in stock.. Thanks

I received a coppers flyer and saw this Superstar JA for $150 I always liked the look of the old jackson's I have owen'd a few over the years I never liked the squelch circuit It was bit choppy no real hysteresis but that was just a minor complaint and I don't remember getting any real bad...

My guess these where probably made in someone’s garage or shop and if they had a problem getting transistors they stuffed the linear with what was available at the time, but that is just a guess on my part. but them over rating them at a dollar a watt sales price = big $$$

Perfect, Thanks!!!

Wow! did you get yours new like that? If so the one I have must have been downgraded for whatever reason. If its not to much trouble could you tell me the color code off the resistor in yours that is smoked in mine? Also while your in there a could u take a photo of the entire board? That...

Off topic a bit what would be a realistic output expectation on an linear that has 4 MRF454’s like this one has I looked up the specs of the MRF454’s and they look to be rated at 80 watts each. I use to have one just like this in the early 80’s but don’t remember what that one did. I don’t...

Preamp works fine but sometimes in the ssb mode once and a while it will just hang. the resistor starts to over heat when I am on ssb. I guess a good test would be turn off the delay and see what happens.

Ok it's in the top right hand corner I put a small red arrow next to it, Thanks

Does anyone by chance have any info on this amplifier such as a schematic diagram? I have a resistor getting hot, the unit still puts out power but obviously has an issue. I have been over to CB tricks but nothing listed as just a M4000. Thanks

Great thanks my call kb6led (at)aol.com Thanks

Ok I found a Sam’s Photo facts manual on ebay for that radio for $7 bucks! I have probably spent at least 2 hours searching the net with no luck, 7 dollars is painless.:thumbup: Thanks for every ones help.

Thanks for the tip, I just dropped them a line I will let you know.

Yep no service info there.