[time-nuts] Frequency division by 81

[Dana Whitlow]

Can you stand a few 10's of nano-Hz error in the 162 kHz signal?  If so, a
48-bit
DDS can get you that close to 162 kHz when the 10 MHz is right on.

However, dealing with the off-the air signal would be problematic as has
been pointed
out, not to mention the added complication of the signal having phase
modulation.

I've occasionally entertained myself measuring and plotting the pilot
carrier of a
UHF DTV station about 35 miles from home, and the received signal is
festooned
with all manner of interesting phase "defects".   Fortunately deep dropouts
seem to
be very infrequent.  Admittedly 162 kHz should be rather more stable than
~578 MHz,
but still ...

Have you considered using a good GPSDO?  Although the short term phase
stability
is not real good, it's otherwise a turn-key and fairly straightforward
solution if getting an
accurate 10 MHz local reference is your goal.

Dana


On Sun, Jun 21, 2020 at 1:30 PM Bob Fleming <Bob.Fleming at usa.com> wrote:

>      French time signal is phase modulated. If I recall correctly.
>
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