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Search results

  1. M

    Cobra29 Chrome,L19 and L23 won't work.

    Hello.how you been, just want to Thank you for the reply on my issue. You are correct, at this time,I did not get it peaked out fully. After peaking it out to it's full extent,yes,I am able to adjust the frequency to the 27.185. Just need to remember what TP does what,I know TP3 is for the RX...
  2. M

    Cobra29 Chrome,L19 and L23 won't work.

    Hello gentleman and DXer's,I have a Cobra with issues. When going to get my RX and TX,the frequency just sits and bounces around, and will not adjust. I have my Frequency meter on TP or R61,for my RX and TX. I replaced T20,T7, and a blown diode,D7,the PLL has 10.695, 10.240, and I can see me...
  3. M

    Mathamatical equation for 14.91mhz,15.81mhz?

    I believe it is for the extra channels.? Someone installed a 3 pole switch in the Delta Tune spot for the upper and lower channels. And using the SWR calibration for a Clarifier, as turning this knob has the frequency sliding up or down. I'm trying to get the TX and RX frequency set for the 3...
  4. M

    Mathamatical equation for 14.91mhz,15.81mhz?

    I have a Cobra 29 LTD CLASSIC I just purchased, another one? The radio has a board with 2 crystals in it, 14.91mhz and 15.81mhz, along with a 10.240mhz and a 10.695 I assume, but I cannot see it between the pots According to the Cobra parts, is is a 10.695 filter. I would like to know or try to...
  5. M

    HR2510,no Receive or Transmit, Voltage regulator?

    Going to do a quick estimate on this HR2510, It probably is going to be over the price limit for repairs, my opinion? Going to reacess the situation, though I could learn a thing or two on this rig?Oh well, I may reacess the 3 more 2510's I have sitting here, and look into one of these...
  6. M

    HR2510,no Receive or Transmit, Voltage regulator?

    Now, sorry to say, blowing fuses now. And the final MRF497, and driver C2166 are Crispy Critters. Oh well,I thought it was going to good. It keeps blowing the power supply fuse, last time I had a radio that blew fuses, I went through almost 40 fuses, Amazon loved me. I guess back to the drawing...
  7. M

    HR2510,no Receive or Transmit, Voltage regulator?

    Got it,a,good tune,,sound like brand new,final doing good,got 25watts on AM, a d almost 50 watts on SSB. The radio coroperated very well,I learned from Handy Andy on the basics of tuning a radio, THANKS HANDY, a 2 to 3 week lesson from him ( sir ) a d it feels like I have been doing this...
  8. M

    HR2510,no Receive or Transmit, Voltage regulator?

    Got a good one for you guys, how about a Uniden Lincoln HR2510? You are probably going to tell me it is not worth the time to fix this aren't you? Com on, it looks like a piece of cake inside these covers? I have 4 HR2510 with no Receive or Transmit, where do we start , LOL. I am serious about...
  9. M

    Diagnosing a bad crystal? Need ideas on helping me and others.

    Thank you,you know I just realized this is the radio that has that ugly looking channel modification board in it, and it has a 14.91MHz and a 15.81MHz crystals on the expansion board. Ok, now, how do I go about setting the primary frequency with these on the radio. I noticed now,that the Delta...
  10. M

    Diagnosing a bad crystal? Need ideas on helping me and others.

    Where do I get replacement Varactor Diodes from? I thought I have some,not.
  11. M

    Diagnosing a bad crystal? Need ideas on helping me and others.

    I have everything you need, Oscilloscope,100MHz, Wave Generator, 3 frequency counters, Watt SWR Mod meter, I have enough equipment to do what we need to do. I am a 1 year learner, lots of reading, hands on, learning on my own. I am a little behind on Injecting, but I am in the middle of...
  12. M

    Diagnosing a bad crystal? Need ideas on helping me and others.

    OK, now I can see that L22 and L23 are not tuning at all, time for the schematics
  13. M

    Diagnosing a bad crystal? Need ideas on helping me and others.

    UPDATE !!!!!!! For some reason, I walked away, came back and now the radio is working????? I am wondering what happened, I have my L19 and L23 adjustment, and I have my shift also. Now I am going to align receive, I have transmit, but I will go over it,I did make a quick tune, but it needs...
  14. M

    Diagnosing a bad crystal? Need ideas on helping me and others.

    Quicky, both mixers and the PLL have the same readings as the frequency counter
  15. M

    Diagnosing a bad crystal? Need ideas on helping me and others.

    OK,I replaced the main Brain,, Now, the D2816C the PLL,, now I have a 30.000 +- to 32.000 +-,OK, it is not going all over ,it is staying steady between those frequency's. Now I still cannot adjust the frequency, turn the pots, and still no movement. This is almost like the last disaster I worked...
  16. M

    Diagnosing a bad crystal? Need ideas on helping me and others.

    I connect tp TP24,TP5,,and TP3,,depending on what you are doing,, mostly to TP3 and TP5,for the TX frequency, then TP2 for the 10.240. I think that should do it. There is a TP4 which is R6,it is marked on somer29's. Still going goofy, I checked all the Diodes, and I tried a receive alignment...
  17. M

    Diagnosing a bad crystal? Need ideas on helping me and others.

    As I hooked up my Frequency counter to another radio from a Buddy of mine, the radios frequency is bouncing all over the place. Radio has no receive and no transmit, of course, it is off freq. I am not sure about diagnosing this radio, as I cannot get this to lock on Transmit freq, bouncing from...
  18. M

    Cobra 25 LTD Classic, no voltage change tuning

    This is what I found on the 29 LTD Classic,2 days of messing around.OK,now with the 29,I found that the L24 can was bad, the can would not let me get the half of the first frequency, 27,185 MHz.I was able to get the receive frequency,18MHZ OK, I also found that the 10.240MHz crystal was acting...