[time-nuts] 60 KHz Receiver
Arthur Dent
golgarfrincham at yahoo.com
Mon Oct 4 02:34:55 UTC 2010
My RMS Engineering receiver is quite old and in fact was
designed to only receive 18 or 20 KHz signals. All the transistors
are 2N404 Ge. Way back someone was selling a conversion
kit to make this unit operate on 60KHz for WWVB. The way
it works is the 100KHz from an external standard is fed to an
injection-locked divide by 5 divider to get 20 KHz then fed to the
modification which is an X3 board to give 60 KHz to directly compare
with the received and amplified 60 KHz from WWVB, then sending
the difference as a d.c. voltage to a strip chart recorder. The
external standard is ideally adjusted to get a zero slope on the strip
chart recorder. Generally the only way to know if the signal is being
received are the 5-minute phase shifts 10 minutes after each hour.
To see the difference you can with a T-bolt and Lady Heather in a few
minutes might take 24 hours or so with the WWVB unit. Making a
series of adjustments to zero a standard might take days.
-Arthur
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