Dear Tom, Luciano, all,
Thank you for your comments. The Sulzer is not intended to be used as a
high accuracy standard. The oscillator fits nicely to some old radio's
;-) However, I think (not measured) that stability of the oscillator is
better then the average stability of a modern low budget oscillator.
Therefore it would be nice to have it up and running. The schematic on
the website of Tom was very helpful. Basically it would be sufficient
for trouble-shooting/repair. However, I would like to figure out the
numbers which should be indicated by the moving coil meter on the front.
I did a quick measurement with a HP counter 53230A (without a very
stable reference). The number shown for the allen variation (after a
couple of hours) was 1.5mHz on the 5MHz signal. (Maybe this number shows
the stability of the HP....??) This number gives good hope, according to me.
Is there a source for manuals on these instruments? I checked the site
of KO4BB, unfortunately he doesn't have a PDF of the manual.
Best regards, Jeroen
On 09/17/2012 02:50 PM, Timeok wrote:
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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