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  1. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    All this time I had to help my Mom and Stepdad move to New Hampshire. Now that they're gone I can get back on the radio. I talked to a friend of my Dads and he and I met at my Dads shop. He told me it sounded like feedback, and he said to spray some contact cleaner in the volume control...
  2. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    I am confused. It's not the first time so I'm kind of used to it. I was checking grounds to the chassis and everything was .8 meg ohms and climbing. So I checked from pins 7 and 8 at IC6 to the ground side of C172, and it was .6 ohms. Aren't all these grounds supposed to be to the chassis? Maybe...
  3. SmilinDoug

    What's going to happen to your stuff when you shove off?

    I'm taking one radio with me, and giving one of the other radio's to my daughter. I'll tell her if the skip is right, expect a call from me.
  4. SmilinDoug

    leave it up or take it down

    I saw on the news it's only a cat 2. The closer to the coast the worse it'll be. Is your tower easy to take down? If you do take it down, I would think you'd need to anchor it some place.
  5. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    I found some headphones at my Dad's. Plugged them in and got the same squeal, but just not as loud as the speakers.
  6. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    The only headphones I have are USB. LOL
  7. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    I tried bridging pins 4 and 5. It does transmit, and of course the noise goes away when it transmits.
  8. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    Those were the points I was testing with the capacitor. I also unplugged the frequency counter and still have the noise. I'm gonna end up scratchin' a hole in my head tryin' to figure this out. LOL
  9. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    Thank you very much. I really appreciate this.
  10. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    When I unplug the mic there's no noise at all. When I bridge pins 2 and 3 the noise comes back.
  11. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    This is great, but what I've been looking for and really need is the board layout of the bottom of the circuit board. I've got a 16volt 1,000uF cap for testing and I think I got the right solder points. The points I tested I ended up getting the same squeal. I'm hoping I got the wrong solder...
  12. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    Now I'm confused. LOL I thought I was supposed to bridge pins 2 and 3. I'll go up to Dad's and try pins 4 and 5 next.
  13. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    I checked this and tried a different mic, it was the same thing, no help. Thanks for the advice though.
  14. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    I did that, bridged pins 2 and 3 and I still got the noise. With the mic disconnected there was nothing, which is right. So I'm sure the mic is wired correctly.
  15. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    I already have. I thought I wrote that in the first post. There might be two bad microphones. I doubt it but I'll give it a shot trying the jumper. Besides I'm learning more troubleshooting procedures and I do like learning things.
  16. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    I'll try that hopefully tomorrow. I live a few miles from my Dad's house. And hopefully my wife doesn't have any projects to do here at our house. Thank you for the help! I'll let you know what happens.
  17. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    Right when I turn on the radio it's got that squeal, all the time. Without keying the mike.
  18. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    So I couldn't find a 1,000 micro farad capacitor in my Dad's shop, so I ordered one. I had to order a pack of 5, but they ended up being about $3 a piece. I touched the leads on the other cap in the radio, and there was no change. Is there a board layout in the forum some where? I'd need it for...
  19. SmilinDoug

    Constant loud squeal when I turn on my Cobra 2000GTL radio

    Thank you! I did not know that about those capacitors. I didn't say anything in my post but I replaced the TA7222P audio power amplifier already. I figured that would be the most logical part, and it was only about $3. I'll look around in my Dad's shop and see if I can find a 1,000 micro farad...