I do plan to try re-grinding a few oddball frequency crystals just to see if I can do it and then say I have done it. Kind of a fun nostalgia thing, since I use the VFO most of the time. I have noticed that regardless of holder (I have an adaptor that allows me to use FT-243s), the frequency is usually at least 300~ off the nominal frequency ...
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Read MoreIf the crystal gets "sluggish" or even quits oscillating completely, grinding the edge of the blank, at an angle, often gets the crystal working again. Plated crystals, i.e. HC6/U types, can have the frequency moved a little bit. Of course, one has to un-solder the the main housing from the base which contains the actual crystal.
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Read MoreSubmerge the crystals in enough full-strength vinegar to cover all the crystals. Leave the crystals for 8 to 12 hours. Remove the crystals from the vinegar. Soak them in washing ammonium for an equal amount of time. Then, remove the crystals from the ammonium, rinse them completely, and wipe them dry.
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Read MoreThe secret to moving the frequency of a crystal very far is that the grinding must be done in a uniform manner. My old friend, NG7A (sk) used to move crystals in the 5mc range to the 7mc range and they all worked just fine. But he had his micrometers on the piece of quartz very often.
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