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  1. vswr

    Cobra 142 GTL

    Grasping at straws here. How about the channel switch? Could it be a cause ofvthe shift? Although when I did my data tests, the highs and lows appeared correct as per the truth table. Hmmmmmmm...........
  2. vswr

    Cobra 142 GTL

    Yeah. I saw it on the schematic. Is there a varactor inside of it? Looking at the schematic, I see where L13 hooks up to it. Im wondering why I get such avstrong dignal that is exactly 10k off. L13 has no cap inside from the schematic, and if all that is controlled by the 11.1125 crystal, im...
  3. vswr

    Cobra 142 GTL

    UHI007. What is that the part number of something? Edit: I see it on thecschematic. I'll have a look at the circuitry.
  4. vswr

    Cobra 142 GTL

    Yes. The voltage changes. Going by the sams im supposed to lock in at 5v but i remember mentionning that it woudnt lock into anything until around 3 volts. Im pretty sure its around the VCO area. I will have to see if there is a cap inside the can or pull one from another radio donor
  5. vswr

    Cobra 142 GTL

    Clarifier hard right
  6. vswr

    Cobra 142 GTL

    Slug resting on can.
  7. vswr

    Cobra 142 GTL

    Pardon the bad leds. Its 38L.
  8. vswr

    Cobra 142 GTL

    My bad. The TX and RX are both off by 10k. This leads me back to L13 and its associated circuitry. D36, lsb, 19, center is 3.21v, left is 1.19, right is 7.48. Anyhow, I figured out something here.. with L13 adjusted to receive maximum freq level, and Ct3 as High as I can getnit close to the...
  9. vswr

    Cobra 142 GTL

    Thats exactly why I removed the open clarifierbmod and put the radio back to factory. To isolate the rx and TX. I will take a few measurements. Give me a moment...
  10. vswr

    Cobra 142 GTL

    The anode is giving me .56 volts. The cathode is 3. 3 volts rx and tx is 3.7. I checked some components today and they are all good readings.
  11. vswr

    Cobra 142 GTL

    Oh. Ok. Wasn't sure. I will get those in the morning. You want them centered in rx and tx AM only?
  12. vswr

    Cobra 142 GTL

    Channel19 L13 frequency. I hear the clowns from 38L on 39L. AM, is also offset by 10 k.
  13. vswr

    Cobra 142 GTL

    Correction 3.37v
  14. vswr

    Cobra 142 GTL

    Im thinking that the outputs are all correct. The highs and lows all check out. Even the skips check out. Thats what makes mevthink that the chip is fine. Ibdid test the output of the chip on channel 19 and its 27.175. 20 skips as 19 would normally to 27.195! I heated up the crystal and I was...
  15. vswr

    Cobra 142 GTL

    Tlright now, it stands that I put the open clarifier back correct. Im taking an 8 volt source from the receiver at the point where the sams says it goes, a 3.3k resistor to ground was also installed, the original pot I replaced. Didnt change a thing. The transmit is working fine. The receive off...
  16. vswr

    Cobra 142 GTL

    I plan on it trust me. Im just so fried right now having put a solid week of at least 5 hours a day into it so I need a little timeout. I will get you that d36 voltage shortly. Tx Am channel 19 and my 7.800mhz is dead on. I donplan to tear out the entire clarifier and test each part 1 by 1. I...
  17. vswr

    Cobra 142 GTL

    Another interesting find. When the clarifier if tuned to 9 oclock and 8 oclock, inpick up channel 38 perfectly while Im on channel 40. What a mess!
  18. vswr

    Cobra 142 GTL

    Yeah. I just saw it. Now I know some effing clown yook a jewelers screwdriver to it and most likely to every slug.
  19. vswr

    Cobra 142 GTL

    Interesting you say that. I just noticed that the slug in L24 is cracked! Now, i know that this radio has been golden screwdrivered.
  20. vswr

    Cobra 142 GTL

    I'll get that for you asap. Im taking a break for now to cogitate this conundrum.