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  1. vswr

    Cobra 142 gtl with a few problems

    Ok. Time to check the crystals. The 11.11125 checks out at 11.11136 clarifier to extreme right, and 111110716 to the left. The 7.802 is 7.80238. The 7.7975 is 7.798338. The 10.240 is 10.24002. The one up by L13 is glued over the numbers but has 3 legs so its not really an oscillator crystal...
  2. vswr

    Cobra 142 gtl with a few problems

    I will bid everyone a great evening. I'll pick this back up tomorrow. Right now im going 10-27 to the bed andc 10- 7 for the night. 73s all a y'all
  3. vswr

    Cobra 142 gtl with a few problems

    Sure is. Im pretty sure I can swap parts out of another radio. I have a lot to chose from . Just needcto know whats similar or exact.
  4. vswr

    Cobra 142 gtl with a few problems

    What other radios run this exact board? I have close to 400 radios here. Lots of 148gtl, galaxy 99v and many others with cybernet boards
  5. vswr

    Cobra 142 gtl with a few problems

    Other than ct3, there were only trimmers forvthebupper and lowers he carved up the noise blanker to isolate all 3. What a mess of such a great radio
  6. vswr

    Cobra 142 gtl with a few problems

    I did but the problem is still there.
  7. vswr

    Cobra 142 gtl with a few problems

    No expo kit. It had thec11.1125 crystal relocatedcalongvwith a 10.something for lowers and a 13.something for uppers. All tied in with 3 20pf caps and soldered to the spot that the 11.11125 was in. The clarifier was one side to ground and the other to a constant 8v source near the pll chip. No...
  8. vswr

    Cobra 142 GTL

    Lol. Im full of typos. Especially uding the phones keyboard. I always hit c v b x and n instead ofvthe spacebar
  9. vswr

    Cobra 142 GTL

    Ok. I'll replace it in the morning.
  10. vswr

    Cobra 142 GTL

    Pf pico
  11. vswr

    Cobra 142 GTL

    I'll check that. The L20 is the AM? I can tune the 2 cans but like I said im up by 10khz on each channel. Would you happen to know the value of ct3? The sams only gives me a part number. Mine was swapped out. I tried a few, 20nf, even a 70nf. Nothing changed.
  12. vswr

    Cobra 142 GTL

    Yes. The 1125
  13. vswr

    Cobra 142 GTL

    Thats cool but the 10k shift throws some of my channels into the A channel area. I did think about doing that mod but when I got into testing transmit and receive, I saw that I couldnt communicate between the walkie and the 142 due to the A channel skips.
  14. vswr

    Cobra 142 GTL

    All great info but how do theybstrip off the 10kz when all is said and done? Thats possibly how my 10khz stays coupled along the path somewhere. Tomorrow I will check all the points where these freqs are and see where my 10k stays added that will be where the problem part is. Great info Brandon!
  15. vswr

    Cobra 142 GTL

    That is amazing work!
  16. vswr

    Cobra 142 GTL

    Such great info. Is this stuff available for all CB radios? Or did you do this in excel?
  17. vswr

    Cobra 142 GTL

    Thats amazing. Im gonna print these out and study them. Thanks Brandon!
  18. vswr

    Cobra 142 GTL

    They are all shifted by 10k.im thinking its the VCO area. Mind you, this was someone's hack job. Its a real mess. If I had some base figures to look for it would make it a bit easier. I mean, the sams shows thevtruth tables and voltages all over but no frequency points to look for. With all the...
  19. vswr

    Cobra 142 GTL

    The truth table checks out on all channels. The freqs are all up by 10k. Not down by 10k. I tested it for receive using my walkie as the transmitter. I pick up channel 1 by transmitting channel 2. So transmitting my walkie on 38, comes up on 39 on the 142. When I hit the channel skips like 3a...
  20. vswr

    Cobra 142 gtl with a few problems

    Some issue withbthe clarifier as well. At 9 o'clock it drops out. Even when aligned to the 5 volts I lose my transmit. If I field adjust L13 I can get Tx back but i losevtx on lower 5 or 6 channels. If I tweak it to get tx back, i lose the top few channels.