[time-nuts] Real YIG data was: YIG oscillator drift question
jmiles at pop.net
Tue Dec 11 18:44:22 UTC 2012
Neat data set! This says a lot about the stability of your HP supply. The
choice of current-sense element makes a big difference in a YIG driver
circuit, and most wirewound resistors fall into the "Don't ask" category.
Would be interesting to try the same test with one of the cheap Chinese
power supplies that use generic cement-encapsulated resistors.
-- john, KE5FX
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-
> bounces at febo.com] On Behalf Of Ulrich Bangert
> Sent: Tuesday, December 11, 2012 5:52 AM
> To: iovane at inwind.it; 'Discussion of precise time and frequency
> Subject: [time-nuts] Real YIG data was: YIG oscillator drift question
> when I read the question I went into my cellar to return with an AVANTEK
> GHz YIG that I had once moved out of a defective spectrum analyzer. I used
> an analogue regulated power supply for the oscillator power and my HP6632
> constant current mode (this YIG NEEDS a tuning current) to supply a tuning
> current of app. 125 mA. Before starting the measurements I let it warm up
> for a day or so. Then I recorded temperature with a PT100 measured with A
> HP3457A in four wire mode and frequency with my U6200A counter
> to my Z3805) using my EZGPIB utility.
> You can download the results from my download page
> Look at the bottom for "YIG Data". Note that the .zip contains a
> configuration file for my PLOTTER utility so that looking at the data is a
> snap with it. Just take care that the "Overide binary data & Graphic
> settings" in the File menu is disabled and "Open" the file.
> While it is surely not comparable to even the worst Xtal it is not as bad
> has been reported here from Bob.
> 73s and Best regards
> Ulrich Bangert, DF6JB
> > -----Ursprungliche Nachricht-----
> > Von: time-nuts-bounces at febo.com
> > [mailto:time-nuts-bounces at febo.com] Im Auftrag von iovane at inwind.it
> > Gesendet: Samstag, 8. Dezember 2012 15:18
> > An: time-nuts at febo.com
> > Betreff: [time-nuts] YIG oscillator drift question
> > Does anybody have direct experience on playing with YIG
> > oscillators? I have read some specs on drift, but I know they
> > are usually worst cases. I would like to get a raw idea about
> > real measured drifts in reasonably stable temperature for a
> > free running YIG with no tuning current. Yes, of course this
> > depends on make, model etc, but any advise would be
> > appreciated.Thanks in advance,Antonio I8IOV
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