Bob wrote:
The 58503 is a Z3801 with a pretty instrument style package put
around it - right?
If so, it might / should have a 10811 in it rather than an MTI OCXO.
I think there may be other minor differences between the 58503 and
the Z3801, including a newer GPS engine, but I'm not positive what
they all are. They are clearly very similar.
The 58503 should have either a dual-oven 10811 or the Symmetricom
look-alike. (The Symmetricom has a 5MHz crystal and a doubler -- it
looks exactly like a DO 10811 except for lacking an HP sticker.) I
bought a 58503 from one of the usual far-eastern suspects, which was
advertised expressly as having a 10811. When it arrived, I saw that
it had the Symmetricom OCXO. I fired off a message to the supplier
complaining that I did not receive the promised 10811, and he offered
to part-refund the purchase price or exchange the
oscillator. Because of the high transaction cost of exchanging, I
elected to take the part refund thinking I would swap in one of the
DO 10811s I had on hand. But after only a week of running, the
Symmetricom was better than all of the 10811s I own! (Interestingly,
my best 10811 is not a DO unit -- it is a SO 10811 that came out of
an HP5345A that was originally part of a 5390A frequency stability analyzer.)
Note: My experience should NOT be read as a claim that the
Symmetricom oscillators are better than 10811s. My sample of the
Symmetricoms is way too limited to make any claims. But this
particular Symmetricom happens to be a very fine OCXO.
Best regards,
Charles
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