Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bob Stewart
To: Bob Stewart ; Discussion of precise time and frequency measurement Sent: Saturday, March 4, 2017 7:14 PM Subject: Re: [time-nuts] Cs standard stability BobYou should to use the same measurement bandwidth when comparing ADEV measures.The measurement bandwidth of a Timepod is usually

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bob Stewart
precise time and frequency measurement 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 trigger jitter of both the 5370A and the jitter of the GPSDO PPS output and consequently

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bruce Griffiths
DO. Also, the ADEV of the GPSDO pretty much tracks > > what is to be expected when run on a good 5370, isn't it? > > > > Bob > > > > > > > > - > > From: Bruce Griffiths > > To: Bob Stewart ; Discussion

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bob Stewart
tracks what is to be expected when run on a good 5370, isn't it? Bob From: Bruce Griffiths To: Bob Stewart ; Discussion of precise time and frequency measurement Sent: Saturday, March 4, 2017 5:22 PM Subject: Re: [time-nuts] Cs standard stability BobThe Phase noise of that

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bruce Griffiths
s > To: Bob Stewart ; Discussion of precise time and > frequency measurement > Sent: Saturday, March 4, 2017 5:22 PM > Subject: Re: [time-nuts] Cs standard stability > > Bob > The Phase noise of that GPDSO seems quite high and some form of filtering >

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bob Stewart
t of my reach. Bob From: Bruce Griffiths To: Bob Stewart ; Discussion of precise time and frequency measurement Sent: Saturday, March 4, 2017 4:28 PM Subject: Re: [time-nuts] Cs standard stability Bob Your reasoning appears somewhat circular. A typical 5370A may have around 35ps o

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bruce Griffiths
From: Bruce Griffiths > To: Bob Stewart ; Discussion of precise time and > frequency measurement > Sent: Saturday, March 4, 2017 4:28 PM > Subject: Re: [time-nuts] Cs standard stability > > Bob > > Your reasoning appears somewhat circular. >

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bruce Griffiths
e, I don't know anything more than that. Correct? > > Bob > > > From: Bruce Griffiths > To: Bob Stewart ; Discussion of precise time and frequency > measurement > Sent: Saturday, March 4, 2017 3:44 AM > Subject: Re: [time-nuts] Cs standard stability &

Re: [time-nuts] Cs standard stability

2017-03-04 Thread Bob Stewart
e, I don't know anything more than that.  Correct? Bob From: Bruce Griffiths To: Bob Stewart ; Discussion of precise time and frequency measurement Sent: Saturday, March 4, 2017 3:44 AM Subject: Re: [time-nuts] Cs standard stability Bob That doesn't seem inconsistent

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 c

[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 some