[time-nuts] Measuring Phase diference between different GPSDO

Bob Camp lists at rtty.us
Thu May 2 21:42:23 EDT 2013


FIrst step is to fire up the 5370B counter and see if it works. If there's a problem re-seat all the boards and see if that fixes it. Simple way to check it is to let it count it's own reference. 

Once you have that working, then yes, measuring time between PPS outputs is the way to go. 


Assuming it is beyond help, then the PicTic counter board is a reasonable alternative. It will also let you measure between PPS's very accurately. 

Both approaches are far more accurate than you will need for checking conventional OCXO based GPSDO's


On May 2, 2013, at 9:33 PM, Mark C. Stephens <marks at non-stop.com.au> wrote:

> I'd like to perform some comparison between a known good GPSDO and some newcomers.
> I want to adjust the crystal turning point as my new GPSDO tend to wander all over the place.
> I see some of you are using the hp 3575A to do this.
> Unfortunately, they are a little out of my price range at the moment.
> What I do have is a an ancient hp 8407a with both 8412a and b Phase magnitude display and a 8413a phase/gain indicator.
> Is there any way they are usable to achieve the desired measurement?
> A also have a hp 5370b timer. I am not sure if it still works, but anyway, would measuring the PPS be an easier option?
> I also hear mention of a PICTIC, what is that?
> Many thanks,
> Mark
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