John:
If it was turned off for more than a year, in my experience, the HP10811
(or similar)
oscillators at the heart of the Z3801A will take about three weeks to
settle down,
and rejoin the previous mature aging curve.
I have built a few GPSDOs using HP10811 oscillators, that I bought off
One crystal expert, who's name escapes me, sorry, told me that if you
power up an oscillator that has been off for an extended period, you
should expect a very rapid ageing process to occur with a lot of the
accumulated changes that would have happened had it been powered on then
to occur when
Hi John and Graham,
On 16/07/11 22:50, Graham / KE9H wrote:
John:
If it was turned off for more than a year, in my experience, the HP10811
(or similar)
oscillators at the heart of the Z3801A will take about three weeks to
settle down,
and rejoin the previous mature aging curve.
I have built a
I think it is in Matthys, Crystal oscillator circuits. Can't quote
page number now, as my verson is somwhere I cant remember. It's an
excellent book if you do some experimentation.
I did write an letter to R.J. Matthys a couple of years ago, and
reveiced an answer.
73 de Thomas LA3PNA/AE5YS.
Thomas, Dan, Magnus, Graham --
Thanks for the replies!
This is an interesting example of no two oscillators are the same.
I certainly expected that there would be aging and retrace on a cold
oscillator, but I started both Z3801As almost simultaneously and within
about 12 hours unit #1 had
