[time-nuts] Old xtal filter

Joseph Gray jgray at zianet.com
Sun Mar 6 14:31:47 EST 2016


Assuming I made the pictures small enough, attached are two images of
an very old crystal filter that a friend found. The strange thing
about it is the bandwidth - 100 Hz. What could this have been used
for, with such a narrow bandwidth?


Joe Gray
W5JG
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