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  1. nomadradio

    Cobra 29GTL/LTD ?

    Pretty sure the local-oscillator signal is still present at that test point for receive and transmit. The ALI Express OLED counter says it has two offsets. Might be able to jigger it to read properly for transmit and receive. The ad listing didn't explain how to select one offset or the other. 73
  2. nomadradio

    The bulldog rises from the ashes

    So long as you don't crack the meter movement open, that's not a big risk. 73
  3. nomadradio

    Cobra 29GTL/LTD ?

    There is, but you'll have to choose whether you want to display the receive or the transmit frequency. The radio's PLL jumps down 455 kHz when you key the mike. The fleabay PLJ6-LED counter board has an offset feature you can set for most any radio, but the AM radios you mention all share this "...
  4. nomadradio

    Why I'm not a prepper

    This guy persuaded me 47 or so years ago that I'm not cut out for the SHTF apocolypse. YMMV 73
  5. nomadradio

    Extra transmitter (only) channels for Brownign Mark 4A

    Only if you build a power supply for it. The power supply and AC cord reside in this model's receiver. 73
  6. nomadradio

    Browning Mark 4A refresh parts kit someday, maybe.

    Good to hear he got posession of the stock. Greg told me how many tons, but all I remember is several. Gonna be a job getting it organized and cataloged for sale. Better him than me. With any luck I won't run out of any Browning-specific stuff in the meantime. 73
  7. nomadradio

    backward swing

    A radio that's too small for an amplifier that's too big will ALWAYS sound sweeter (and swing better) than a radio that's too big with an amplifier that's too small. This has always been the perennial favorite comination that we're used to seeing. The answer is always to turn something down...
  8. nomadradio

    Extra transmitter (only) channels for Brownign Mark 4A

    Here's the breezy version of extra transmit channels for the Browning Mark 4A transmitter. Not the Mark 4. Different transmitter altogether. This setup requires two toggle switches and wire. One DPDT on-on switch and a SPST switch. Or any substitute. The focus of this trick is nine...
  9. nomadradio

    Browning Mark 4A refresh parts kit someday, maybe.

    Revisions continue for this idea. We have used four 1N5408 rectifiers to replace the Mark 4A 4-legged bridge "block". Had too many of the factory bridge cause a headache after a repair. But simplifying the labor for this procedure is probably a good idea, so this list now starts with a one-piece...
  10. nomadradio

    Palomar 300A refresh. Assume nothing.

    Mostly I avoid making negative statements about a particular product. I'll just channel grandma to describe the 350Z. She said "If you can't say anything good, don't say anything. " Besides that we won't fix one. 73
  11. nomadradio

    cobra 89gtl, odd channels not working

    Has to be a broken wire connection between the channel selector and the PLL chip. Or maybe a solder bridge between two of those wires? 73
  12. nomadradio

    Palomar erf9530 source

    Gotta figure it's in the thousands. But if the transistor's unit cost is well under a buck, it's worth somebody's while to do. Now that everybody uses laser etching instead of ink it has to be easier than ever to buy what they used to call a "house number" part. 73
  13. nomadradio

    backward swing

    Most amplifiers are not directly compatible with a stock legal 40-channel CB. The amplifier tends to exaggerate the carrier, and limit the audio peaks. There are two ways to fix it. One is to turn down the amplifier if it has a High/Low or H/M/L switch. This is the cheap fix, but not so popular...
  14. nomadradio

    Palomar 300A refresh. Assume nothing.

    Ah, "both"? It came with one fusholder on the rear of the RF deck. We adopted the habit of putting a 15 Amp fuse in a holder on the power transformer to protect the low-voltage winding. Found that a short on the 12 Volts alone might not trip the AC fuse in time to protect the 12-Volt winding...
  15. nomadradio

    Another 2517 low receive issue

    The speaker amp chip has nothing at all to do with AM transmit audio. Another job for a cheap outdated o'scope. Seeing is believing. 73
  16. nomadradio

    Transformer test fixture

    What I mean by false peak is the behavior of the tuning slug. It reaches the rim of the opening and appears to exhibit a peak because turning it further reduces inductance as the slug rises above the rim. Max inductance gets you closest to resonance without reaching it. Max inductance is...
  17. nomadradio

    Another 2517 low receive issue

    Didn't change C9? Its directly between the chip's output on pin 9 and the speaker. A 'scope would reveal at a glance if that were causing trouble, just comparing what goes into it with what comes out of it. 73
  18. nomadradio

    WTB: Broken Galaxy DX55V

    I think we have one that got converted to use as a VFO on Browning base-station transmitters. Wasn't a good conversion, but that part of it still worked last time I powered it up. Just doesn't drive the Browning hard enough. Can't sell them on fleabay. Always get a nastygram that it's not...
  19. nomadradio

    Browning Mark 4A refresh parts kit someday, maybe.

    I'm certainly ready for Alan to make the Browning-only parts available again. Greg Barkett stopped selling the day he got paid to close out that stuff. Alan didn't purchase the e-commerce site nor the database that goes with it. Getting it all listed online will take some effort. Just glad I...