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Scott and others I am sticking with my first guess for now --two peaks on the IF [ If response is not flat enough] .. but I have no conviction on that. i agree that SMD, even if it is possible in the

Scott, you're right that the SX-62 doesn't have the IF cans susceptible to SMD, but I believe the problem is plain old leakage, not SMD. I'm sure there's information on this on the various boatanchor

I don't believe SMD affects the SX-62 or SX-71, as they have the larger IF transformers that came before the miniature transformers with the Mica caps built in the base.

Joe; i guess you are speaking of SMD [silver mica disease] that apparently seems to make them erratic and then die shorted out and is common in many 455 kH IF transformers for AM etc.? The original

I seem to recall that there's a chronic problem with bad mica caps inside the FM discriminator can. If I remember correctly, those caps can cause all kinds of strange problems with FM performance. ?

Skip:? Its too bad that you didn't get more response from others; i seem to recall this sort of thing on an EICO HFT-90 FM tuner [1959], and /or a Heathkit AR-15 stereo receiver [1969], but have no

Steve; thanks for the clarification. I am only inquisitive now… Its driving me nuts too .. As I see it, you have a generator that really wants its frequency to be “the frequency” and a crystal

Thanks, Richard. I’ve opened the holder twice – cleaned everything (it wasn’t dirty, though), and carefully reassembled. I think it’s just an old design and was considered “good enough”.

Don, The frequency will jump suddenly from A to B and then settle on that for a bit. The changes aren’t slow. 73 – Steve, KW4H From: <[email protected]> on behalf of don Root

FWIW i opened the filter compartment of my HQ 129 X? the crystal is in a holder similar to the one pictured in the SX110.? Itried tapping it.? Did not change frequency or have any effect on the

I’m still curious; does the frequency jump suddenly from A to B, or does it settle for a bit on a variety of frequencies? or is it a slow change? Don VA3DRL Sent: Thursday, November 3, 2022 4:42 PM

Steve it Took a bit of work for the old gray matter to digest your last comment, and i will ditto your first line. 73 Don VA3DRL Sent: Thursday, November 3, 2022 7:51 PM To:

Good luck to you both, please keep us posted! And by the way, Bill, whenever I see your callsign I get a bad case of dyslexia. ? 73 – Steve, KW4H From: <[email protected]> on behalf of

Good luck again and your enthusiasm is contagious. * K2WH* *Bill's QRZ Biography ( https://www.qrz.com/db/k2wh ) * -----------------------------------------------------

That's really interesting, Bill. I'd never even thought about that, but what a brilliant way to check on local oscillator drift! I really must get on with my SX16 restoration but it's going to be a

??Hmmm... a few more comments, Steve - You align the IF's, peaking each at the frequency you've determined the crystal best "sings" at. For example, at least using a SA, for a 455 kHz crystal

The crystal in my old super pro is rather large . It is in a bakelite holder with removable electrodes.? It's been a while since I've been into it but I don't remember it's being spring loaded or

FYI – I stumbled across this video, which helped answer some of my questions. The focus was the SX62, but the principles and circuitry are nearly the same. It was some of the best 30 minutes of

An update. I just did another crystal alignment and yet again found the right spot and re-confirmed the crystal oscillator frequency null is at 453.410 KHz. However, there is no doubt that merely

Perfect. Woulda thunk it? Thanks. Dan WB4GRA