[time-nuts] Re: HP 8663A: option 003

[Tom Knox]

I do not have the answer but can add a few questions. 640MHz was used in a number of applications with the HP 11848A and E550xA/B 70420A Phase Noise Test Sets and accessories, I think the 8663A option 03 is aligned with attention to 640MHz but the hardware is basically the same. I am going on memory so I could be wrong. But this should help point you in the right direction.

Tom Knox
SR Test and Measurement Engineer
Phoenix Research
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________________________________
From: Matt Huszagh via time-nuts <time-nuts at lists.febo.com>
Sent: Thursday, April 20, 2023 10:24 AM
To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
Cc: Matt Huszagh <huszaghmatt at gmail.com>
Subject: [time-nuts] HP 8663A: option 003

HP 8663A option 003 gives guaranteed/specified SSB performance for the
640 MHz output. What exactly does this mean? Are there hardware
differences in the reference section of the 003 units in comparison with
non-003 units? Or, was the hardware the same and HP simply categorized
them according to measured SSB performance? If it's the latter, what
implications does this have for buying 003 or non-003 units now? I think
I remember reading somewhere on this list that 10811A SSB
categorizations don't matter much after this amount of aging. Maybe the
same thing applies here?

Thanks
Matt
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