Label sez B/W is actually 10cps or 10Hz, not 100. Could have been used in a
carrier recovery scheme in a DSB/ISB receiver. These typically had three IF
filters, one for carrier recovery and one each for USB and LSB.
DaveB, NZ
----- Original Message -----
From: "Joseph Gray" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Monday, March 07, 2016 8:31 AM
Subject: [time-nuts] Old xtal filter
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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