Jim,
On 12/05/2015 11:45 AM, Poul-Henning Kamp wrote:
--------
In message <CALH-g5bQ-muUQP=hpxr6wncinqbwwofj0xob3q15wyoewox...@mail.gmail.com>
, Jim Palfreyman writes:
The weird thing is that the jump is ~0.7ns and that 1/0.7E-9 is close-ish
to 1420.4MHz which is the hydrogen line. Too much of a coincidence for me.
Is there a direct digital divider chain to the PLL which steers the
5Mhz OCXO ?
If so the obvious thing to look at is a weak input signal on the input
side of that divider.
Indeed, as it does cycle-skipping, so it seems you miss detecting one.
You could get similar behavior if you ripple ahead a cycle every once in
a while.
I've been fighting cycle-skipping issues before, but not on H-masers.
Check your signal level is a good start.
Cheers,
Magnus
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