I'm guessing that the 8566, being the flagship product, used the
deluxe version of the 10811 with RF connectors instead of
the edge card connector usually seen. The
two versions were designed with A and B suffixes originally,
and later with D and E suffixes. (I don't know what happened
to the C suffix). Inside the shielded box, the oscillator itself
is a normal 10811 series.

Rick N6RK

"John Miles" wrote in message
...
In article rKXHc.53423$MB3.51741@attbi_s04,
says...
I was the project manager of the 5334B frequency counter.
It had an option to have a 10811 timebase. The standard
timebase, which I inherited from the 5334A design was
embarassingly bad, barely able to do 10 PPM. Unfortunately,
you cannot retrofit a 10811 to a 5334, because you need an
extra PC board. This board is required to be able to put
the 10811 on its side, because there isn't enough height for
it.


Interesting. Could you shed some light on the timebase used in the
8566B and related analyzers circa 1984? The one I'm looking at doesn't
appear to be the standard 10544 or 10811 unit. I've never run across
one of these before in any other HP instruments. Is it just a
repackaged 10811?

-- jm

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