Re: SX-110 Crystal Instability
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I've owned several SX-110's over the years, including the one I used as a Novice back in '67, that was like new I acquired from original owner. Never had any issues with xtal instability. They all were fairly stable after initial 10-15 min. warmup. Sounds like you need a new xtal.
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GL/73,
Bob K3AC
In a message dated 11/2/2022 1:23:14 PM Eastern Standard Time, reedsteve@... writes:
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Tried that. ?
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Sent from Proton Mail for iOS
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On Wed, Nov 2, 2022 at 10:20 AM, Richard Knoppow < 1oldlens1@...> wrote:
I am not an expert but think this is not normal.? ?It looks like the crystal holder comes apart.? ?Perhaps cleaning crystal and electrodes will fix it.
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-------- Original message --------
From: "KW4H via groups.io" <reedsteve@...>
Date: 11/2/22 9:28 AM (GMT-08:00)
Subject: [HallicraftersRadios] SX-110 Crystal Instability
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Attached is a photo of the crystal in my SX-110.? I pulled the crystal to test its resonant frequency using a sig gen and scope, and the darn thing is so unstable it¡¯s driving me loopy.? The resonant frequency can vary (roughly) between 453.700 KHz and 453.800 KHz by simply moving it around, no matter how gently.? Pardon my ignorance, but is that normal for crystals of this vintage?? Is there a reason, operationally in the Hallicrafters, for a crystal to act like this?? Before I order a different (and more stable) crystal to solder into the circuit, thought I should ask.
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73 ¨C Steve, KW4H
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