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FT-243 tested crystals for the 40 meter amateur band (low frequencies)
FT-243 tested crystals for the 40 meter amateur band (low frequencies)
FT-243 tested crystals for the 40 meter amateur band (low frequencies)
FT-243 tested crystals for the 40 meter amateur band (low frequencies)
FT-243 tested crystals for the 40 meter amateur band (low frequencies)

FT-243 tested crystals for the 40 meter amateur band (low frequencies)

$ 10.53

Availability: 59 in stock
  • Band: HF
  • Type: FT243
  • Brand: Unbranded
  • Condition: Used
  • Country/Region of Manufacture: United States

    Description

    This offering is for two good FT-243 crystals (7003.9 and 7004.4 kHz) with the original large pressure-mounted quartz blanks; not FT-243 cases containing small modern crystals.
    These are reground military crystals checked for activity and tested in a series resonant oscillator (see last photo).
    As such, they are suitable for both tube and semiconductor circuits.
    The actual frequencies have been checked on a GPS disciplined counter (see photos). The frequencies shown may vary slightly, depending on circuit loading. Counter and test oscillator are not included!