[time-nuts] Re: HP 10811A unusual appearance

[Bob kb8tq]

Hi

There are at least two *very* different 10811 PCB’s out in the wild
in quantity. I don’t have access to the “stockpile” right now so I can’t
say how the one in the picture compares to the commonly seen 
varieties. 

Bob

> On Aug 22, 2022, at 8:22 PM, Matt Huszagh via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Hi,
> 
> I purchased a few standalone HP 10811As. One of them piqued my curiosity
> a bit because it doesn't look like the other 10811s I'd seen before. In
> particular, it doesn't have a full serial number and the PCBs don't use
> green solder mask.
> 
> Any idea what might account for these differences? Was this perhaps an
> early unit? I'm not too concerned about it; just curious.
> 
> I did a basic test of the operation and it seemed totally normal:
> typical oven and oscillator current draw and warm up time. Normal levels
> for oscillator output. I haven't done any more rigorous tests, such as
> for phase noise or aging performance.
> 
> Thanks
> Matt
> 
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