[time-nuts] Old xtal filter

Arnold Tibus Arnold.Tibus at GMX.de
Sun Mar 6 17:20:19 EST 2016


Joe,

if I read correct, the BW of this filter is only 10 Hz (cps), not 100 Hz,
@ carrier frequency of 100 kHz.
Such a low bandwidth is useful to work with very faint signals.
The low BW reduces noise, but the received signal must be
very slow to pass the filter and the transmitter/ receiver system
must be very stable to not miss each other.
One such application would be CCW (Coherent CW).
But what was the real application of that filter I have
no knowledge ...

Arnold, DK2WT

Am 06.03.2016 um 20:31 schrieb Joseph Gray:
> 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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