Re: SX-110 Crystal Instability
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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 tapping on the crystal ¨C even a tiny bit ¨C causes the null point to noticeably change when the crystal is in use.? Now ¨C to be realistic ¨C that¡¯s what the crystal phasing control is for, and it won¡¯t end up in exactly the same place every time.? If it shifts a little, the phasing control ends up in a different position when you adjust it.? So, for a receiver this old ¨C meh ¨C and probably no one cared back then at this price point.? Nevertheless, I¡¯m going to try replacing the crystal with one that doesn¡¯t jiggle.? Just because. ? 73 ¨C Steve, KW4H ? Perfect.
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On Nov 3, 2022, at 3:46 PM, Jacques_VE2JFE <jacques.f@...> wrote:
? Hi Dan, You wrote: But a loose mounted crystal wafer rattling about and being OK isn't an intuitive conclusion. Like to learn more about that. There is several examples of old radios using a ¡°loose resonator crystal¡±. The old models of HRO use a plug-in crystal that ¡°rattle¡± when you shake the holder. Another fairly well explained case is here: Go half-way down the page. ? 73, Jacques, VE2JFE in Montreal
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