[Boatanchors] How did they "pinpoint" frequencies way back when?
Glen Zook
[email protected]
Sat, 10 Apr 2004 21:02:52 -0700 (PDT)
The accuracy and stability of the receivers of the
World War II era are really not that bad. The
bandwidth is fairly wide unless the crystal filters
are "cranked in" so a little drifting wouldn't make
that much difference.
Also, the receivers were never turned off except when
needing repair, thus were very stable. In addition,
since the equipment was crystal controlled on the
"other" end, it would have been very easy to have a
crystal controlled oscillator on the receiving end to
"calibrate" the receiver. Just turn on the frequency
"standard", "zero beat" your receiver, turn off the
standard, and wait for the scheduled transmission.
Glen, K9STH
--- Philip Atchley <[email protected]> wrote:
How did "intercept ops" accurately set their receivers
for expected incoming messages?
=====
Glen, K9STH
Web sites
http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco
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