[time-nuts] Old xtal filter

Bob Camp kb8tq at n1k.org
Sun Mar 6 16:21:39 EST 2016


Hi

> On Mar 6, 2016, at 2:31 PM, Joseph Gray <jgray at zianet.com> wrote:
> 
> 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?
> 
> 

Pilot tone recovery on a FDM system would be one possible answer. Since it’s 
100KHz there could be timing related answers as well.

Bob

> Joe Gray
> W5JG
> <1.jpg><4.jpg>_______________________________________________
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