On Mon, Jan 12, 2015 at 06:16:01PM -0500, Bob Camp wrote: > Actually it’s a bit worse than you might expect. > The uncorrected sawtooth will give you about 20 ns of wander. At the one day > level, GPS without some sort of ionosphere help (like a dual frequency > receiver) will add another 10 ns or so to that. Net, your pps is spread over > a 30 ns range.
Hello Bob. Thank you, now I have a better idea. I understand that the NTP is completely ruled out and also between GPS there is a strong difference. > With things like 5335’s running around for cheap prices, I would suggest > doing this with a counter. You are going to spend a lot of days getting very > much data. Your time’s got to be worth something …. Actually I own a Racal 1995 that should be better than the 5335 with its 1ns single shot resolution. However, I don't still own a GPSDO to reference the counter so how do you suggest to use it? I should use total A over B with the DUT in A and the PPS in B? Best regards, Andrea Baldoni _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.