Hi,
On 03/07/2016 12:42 AM, Poul-Henning Kamp wrote:
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In message <caf7opz0srwdmed1av2m_tkyw6k+esr+akka+kn623_lf8kv...@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.
It does not match any of the FDM pilot tone systems that I've seen.
It also does not match the TDM system rates, and this device seems old
enough to almost precursor them.
Cheers,
Magnus
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