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

[Richard (Rick) Karlquist]

The original 10811's used so-called "sculptured" flex circuits.
That was a disaster and then they changed to conventional ones.
I don't know if any of the sculptured ones shipped.  If they
did, it might explain why the boards look different.  It
could be that no sculptured versions officially shipped, but
you have a prototype that escaped from the mother ship
without a serial number.

Rick N6RK

On 8/22/2022 9:22 PM, Matt Huszagh via time-nuts 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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