Hi
Replacing the synthesizer with something more modern is certainly possible. I
have
a project (slowly moving along) to do just that. There is nothing crazy on the
logic board,
it could easily be replaced with something more modern for not a lot of money.
The phase detector / photo amp /
Having been shut of for several months I fired up the
refurbished 5065A a few weeks ago.
It has since been equipped with a new AC-amplifier
(A7) and a new Rubidium cell with the repaired lamp
(thanks to Corby Dawson) and a receiver with a
TED that was connected according to HP instructions.
That's very interesting, Matthias! The lower noise floor intuitively
and the sqrt(2) improvement comes to mind, except that would apply only
if the two measurements were uncorrelated. Here, you have a common 10
MHz reference, so there's correlation.
But... the high-speed ring counters
