[time-nuts] Measuring Phase diference between different GPSDO

Al Wolfe alw.k9si at gmail.com
Fri May 3 16:09:42 EDT 2013

How about just running the two different 10 mhz outputs into a doubly 
balanced mixer and monitoring the DC output with a volt meter from the IF 
port of the mixer? Sure beats $20,000 for a fancy HP. Of course this is a 
very simple method and is boring as heck to sit and watch a voltmeter but it 
could easily be automated.

Suitable doubly balanced mixers can be often found on eBay for under $50. I 
found a nice Mini-Circuit unit with BNC connectors for around $20 that I 
have often used.

I often just use a scope and Lissajous figures for looking at phase 

Al, K9SI

> Now the trick is:
> How to use the 5370B to measure the phase difference.
> Anyone care to point me towards an APP note or two?!
> mark

More information about the time-nuts mailing list