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

[Bob Camp]

Hi

I think you will find that they put a SAW based oscillator into the option 003
units. It certainly is more than just a “select the best” process.

One would guess that since this is phase noise and not aging, the factory 
number still probably do matter. 

Bob

> On Apr 20, 2023, at 12:24 PM, Matt Huszagh via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> 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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