I forget to comment on trimming the existing crystal's
frequencies: There is no adjustment provided in the 3586B for
netting the crystals. We tried adding adjustment capability, but
since the crystal frequency is divided down by a fair amount it would
take more adjustment than the actual crystals were happy with. I
believe it would take a complete redesign of the crystal
oscillators. At the time we felt it wasn't worth the effort,
especially when measuring the I.F. was so simple and very accurate.
Burt, K6OQK
Subject: [time-nuts] HP 3586 entirely referenced to 10MHz...
Perry,
Marv W6OQI and Stu K6YAZ and I looked at ways to either stabilize the
Product Detector's L.O or devise a scheme to derive the necessary
L.O. frequencies from the reference. Short of creating a monster of
a science project, there's no simple way to get there. Stu made a
comment that there's nothing sacred about the 1850 Hz tone. You
could change the L.O. to produce any tone within the systems (audio)
bandpass and have it work - as long as you know what the offset is
that results from the "new" tone and apply that to your
calculations. If that's all you wanted to use the receiver for that
would be ok.
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
[email protected]
www.biwa.cc
K6OQK
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