[time-nuts] Thunderbolt question regarding PPS and 10MHz phase relationship

2009-09-20 Thread Mark Sims
It can be altered, but only by 50ns. You can invert the phase of the osc sense (feature not available on Thunderbolt-E or Thunderbolts built before March 1998). Use the '^' command in Lady Heather. The PPS output is synchronous with the 10MHz signal

Re: [time-nuts] Thunderbolt question regarding PPS and 10MHz phase relationship

2009-09-19 Thread Bruce Griffiths
Bob One way of reducing the effective noise/jitter on the PPS signal when using it with the 5370 to measure the instability of a source with respect to the Thunderbolt is to use the PPS to ARM the 5370 whilst the 10MHz from the thunderbolt starts the 5370 and the source (or a frequency generated b

Re: [time-nuts] Thunderbolt question regarding PPS and 10MHz phase relationship

2009-09-19 Thread Robert Darlington
Ah ha! That explains the changing numbers I see on the 5370B (jitter), and explains why I see no change on the scope other than the jitter. Reading the manual, I don't see any clear explanation like what you just gave me. I see my mistake in manual interpretation but not until after reading your

Re: [time-nuts] Thunderbolt question regarding PPS and 10MHz phase relationship

2009-09-19 Thread Bruce Griffiths
Bob Robert Darlington wrote: > Hello all, > > I'm trying to adjust the time between the leading edge of the PPS square > wave and the 10MHz zero crossing outputs on a Trimble Thunderbolt. The > manual seems to indicate the cable delay compensation setting will do this. > No, it doesnt. This on

[time-nuts] Thunderbolt question regarding PPS and 10MHz phase relationship

2009-09-19 Thread Robert Darlington
Hello all, I'm trying to adjust the time between the leading edge of the PPS square wave and the 10MHz zero crossing outputs on a Trimble Thunderbolt. The manual seems to indicate the cable delay compensation setting will do this. As I understand things, this is also called the "PPS Offset" in th