[time-nuts] Entry level systems

Didier Juges didier at cox.net
Sat May 27 18:18:56 EDT 2006

Thanks John,

That makes sense. I tried feeding the 10 MHz of two HP synthesizers and 
got useless results. Now I see why. I understand that using the 1 pps 
output makes more sense.
If my counter had the a/d output, I would be very close to having all I 
need to synchronize the VCXO to GPS...

Didier KO4BB

John Ackermann N8UR wrote:
> I use time interval to compare frequency offset and stability by feeding
> the unknown signal into the start input, and the reference into the stop
> input.  The actual time interval doesn't matter, but by tracking the
> delta in time interval you can determine offset and drift.  Typically,
> you use 1pps to do this, but there are ways to use higher frequencies,
> though they run into problems with cycle slip if the two sources aren't
> very close to each other.
> John
> ----

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