Yes Tom you right,
but your example is on a rare Sulzer 2.5 MHz. Another very good
reference can be an HP 106 (quasi impossible to find). This is not valid
for the Racal model as described. I have had several unit of this
standar under test and I keep one for my personal small museum. I have
also a Suzer 5 MHz, it is better than Racal but same as performance to
several others. I have an HP 107Br but it is not working and I cannot
test it at the moment.
All us are looking to find some units in flea market, old and good, but
this is a very rare event due the fact there is a large 5e-10
(OCXO)production or lower, and few top performance products as you
describe.
good luck to us!
Luciano
Il 2012-09-14 19:32 Tom Van Baak ha scritto:
This equipment is only good to spend winter time or for museum.
Several
newer oscillator,like HP10811/10544, have the same characteristics
or
better in smaller size.
The component used ar not the best and you can have fault expecially
on
the power supply.
Luciano,
My experience is that some of these old 2.5 or 5 MHz Sulzer
oscillators have vastly better performance than most 10811/10544. For
example, see:
http://www.febo.com/pages/oscillators/sulzer/
http://leapsecond.com/museum/sul25-1/
http://leapsecond.com/museum/sul25-2/
While it is true that they don't always work out-of-the-box when you
find them cheap on eBay, once fixed, their performance is stunning.
That's why these rare old Sulzer's are highly prized.
/tvb
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