The March/April 2024 issue of Electric Radio has an article about using a ProgRock "programmable crystal" in the restoration of a Heathit HX-1681.? Interesting information on how to program it and integrate it into the circuit.
-- Art Delibert, KB3FJO
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Or replace a whole bank of crystals(59?) for $14, see the Files section for:
$14 Homebrew FS-4B
Old fashioned crystals are obsolete!? hi hi...
73,
Gary
WB6OGD
