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

[Jim Muehlberg]

Matt,

FWIW, here is the phase noise of an opt 003 8663 v. another of the same 
at 640 MHz.  I did not bother to check if it met spec...it's Friday, and 
apparently, I am needed at home for my birthday party.  Go figure.

Jim

On 2023-04-20 12:24 PM, Matt Huszagh via time-nuts 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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-- 

Jim Muehlberg
Senior Engineer

National Radio Astronomy Observatory
ngVLA Local Oscillator Lead

1180 Boxwood Estates Rd B-111
Charlottesville, VA 22903-4602
P 434.296.0270
C 434.422.2017
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