[time-nuts] Man with too many clocks.

paul swed paulswedb at gmail.com
Thu Nov 3 09:24:00 EDT 2016

"Danger Wil Robinson...."
There you go good old time nuttery. Pete its bad to start to compare
things. Because then you have questions. That leads to the need for a
better reference.
Around and around it goes.
TCXO's for my 2 cents really tend to introduce variables. Yes better then a
free standing crystal in general. Some of the HPs actually used a true free
standing crystal. 5335 and 5328 as I recall.
By locking all of the counters together you at least limitthat variable to
the source.
Given the cost of GPSDOs that would give you a pretty good arrangement then.
Have fun

On Thu, Nov 3, 2016 at 8:20 AM, Peter Reilley <preilley_454 at comcast.net>

> I am the proverbial man with too many clocks and I don't know what time it
> is.
> To correct this situation I have decided to calibrate everything.
> I have a HP 5370B, a HP 6370A, and a HP 5328A all with the TCXO option.
>  I also
> have some TCXO modules.   I figured that I would calibrate them against my
> Trimble
> Resolution T GPS receiver.
> I put the 1 PPS signal in one channel of my scope and one of the 10 MHz
> signals in the other channel and look at the phase relationship. The
> TCXO's are
> already close enough that I should not be out by more than a fraction of a
> waveform.
> I understand that I have to deal with the 1 PPS without sawtooth
> correction.
> I expected to see the 10 MHz signal bounce around but not move more than
> 1/2
> of a wave length.   Instead I see the 10 MHz waveform appear steady for a
> few seconds
> then jump a significant portion of the wave.   The jump is too much to be
> confident
> that I have not slipped one cycle.
> Can I do what I am trying to do or am I missing something?
> Pete.
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