On 4/12/17 7:14 PM, Richard (Rick) Karlquist wrote:
10.9 MHz is likely the B-mode of the SC cut.
(It's a different mode, not a different overtone).
This mode has a tempco of 20 ppm and is used
to do thermometry.
IMHO, there is NO excuse for the oscillator
designer to design an oscillator that doesn't
oscillate unconditionally in the right mode.
NONE! What was the actual manufacturer of
the OCXO? (AFAIK, Trimble doesn't make their
own).
My old boss at Zeta Labs (a really great boss)
used to walk up to people who were testing
their latest circuit and momentarily turn
down the current limit on each of the power
supplies to see if the circuit recovered
correctly. It often didn't, and then it
was back to the drawing board...
These days, a common trap is when you've got a DC/DC converter on the
input - with a soft start, the current goes huge, causing all kinds of
problems.
(I'm in the middle of closing a failure report on just such a
sensitivity - an unexpected interaction between the source DC/DC
converter and the load DC/DC converter..)
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