Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bob Stewart
<bruce.griffi...@xtra.co.nz> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Saturday, March 4, 2017 7:14 PM Subject: Re: [time-nuts] Cs standard stability BobYou should to use the same measurement bandwidth w

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bob Stewart
.nz> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Saturday, March 4, 2017 6:03 PM Subject: Re: [time-nuts] Cs standard stability BobWe are certainly not off track.The phase noise of the GPSDO affects the trig

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bruce Griffiths
cussion of precise time and > frequency measurement <time-nuts@febo.com> > Sent: Saturday, March 4, 2017 6:03 PM > Subject: Re: [time-nuts] Cs standard stability > > Bob > We are certainly not off track. > The phase noise of the GPSDO affects the trigger ji

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bob Stewart
Subject: Re: [time-nuts] Cs standard stability BobThe Phase noise of that GPDSO seems quite high and some form of filtering (bandpass or low pass) of its output may be necessary to reduce the resultant jitter when connected to the 5370A input.There are commercial TDCs that claim that sort of

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bruce Griffiths
From: Bruce Griffiths <bruce.griffi...@xtra.co.nz> > To: Bob Stewart <b...@evoria.net>; Discussion of precise time and > frequency measurement <time-nuts@febo.com> > Sent: Saturday, March 4, 2017 5:22 PM > Subject: Re: [time-nuts] Cs standard stability > &g

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bob Stewart
From: Bruce Griffiths <bruce.griffi...@xtra.co.nz> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Saturday, March 4, 2017 4:28 PM Subject: Re: [time-nuts] Cs standard stability Bob Your reasoning appe

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bruce Griffiths
-- > From: Bruce Griffiths <bruce.griffi...@xtra.co.nz> > To: Bob Stewart <b...@evoria.net>; Discussion of precise time and > frequency measurement <time-nuts@febo.com> > Sent: Saturday, March 4, 2017 4:28 PM > Subject: Re: [time-nuts] Cs standard stabili

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bruce Griffiths
. Of course, I don't know anything more than that. Correct? > > Bob > > > From: Bruce Griffiths <bruce.griffi...@xtra.co.nz> > To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency > measurement <time-nuts@febo.com> > Sent: Saturd

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bob Stewart
anything more than that.  Correct? Bob From: Bruce Griffiths <bruce.griffi...@xtra.co.nz> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Saturday, March 4, 2017 3:44 AM Subject: Re: [time-nuts] Cs

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bruce Griffiths
Bob That doesn't seem inconsistent with the specs given the contribution of the 5370A to the measured ADEV is likely to be of the same order as the PRS45A spec. The ADEV of the GPSDO also needs to be taken into account. The contribution of the 5370A to ADEV will gradually become insignificant

[time-nuts] Cs standard stability

2017-03-04 Thread Bob Stewart
I hooked up my PRS-45A yesterday, just to do some ADEV comparisons with my GPSDO.  Unfortunately, the GPSDO seems to be better by almost two points at all tau as measured on my HP 5370A and plotted by Timelab.  So, can I infer from that that the OCXO in the PRS has a problem, or could it be