[time-nuts] OXCO Spurious Output at Line Frequencies

timeok at timeok.it timeok at timeok.it
Tue Jul 12 10:31:20 EDT 2016


I agree with you. Some HP spectrum analyzer have  internal 50 and 100 Hz spurs down to -80dBc due the fan as described in the manual. It can be the spurs are from the test set and/or connection cables. If your oscillator is battery powered you can be sure the spurs are not from the source. Anyway I think the -130 dBc value is a very good response.


From: "time-nuts" time-nuts-bounces at febo.com
To: time-nuts at febo.com
Date: Tue, 12 Jul 2016 11:44:31 +0100
Subject: [time-nuts] OXCO Spurious Output at Line Frequencies

I have a customer who is measuring the phase noise of my 10 MHz ultra-low phase noise frequency standard.
He is seeing spurious signals at line frequencies (50 and 100 Hz as we are in Europe) at a level around -130 dBc.
My opinion is that it's impossible to get much better than that.  Even running on batteries make little difference, since the equipment is in a test rack with AC signals everywhere.
Even the £50k R&S test set he is using only quotes a spurious spec of -90 dBc.
What experience does anyone have here?
Best Regards
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