[time-nuts] Old xtal filter

Poul-Henning Kamp phk at phk.freebsd.dk
Sun Mar 6 18:42:32 EST 2016


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In message <CAF7oPz0SrwdMed1av2M_tkYw6K+EsR+akKa+kN623_Lf8KVf4g at mail.gmail.com>
, Joseph Gray writes:

>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?

The 100kHz center frequency pretty much rules out that it comes
from carrier telephony.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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