Re: [time-nuts] GPSDO three cornered comparisons

2012-10-22 Thread Tom Van Baak
Cc: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, October 21, 2012 9:27 PM Subject: Re: [time-nuts] GPSDO three cornered comparisons Tom, This is true for the phase data and calculating short term stability, but not necessarily for measuring the tempco

[time-nuts] GPSDO three cornered comparisons

2012-10-21 Thread David Hooke
Hi All, I have an HP 58503A and a Symmetricom 58503B which are behaving quite differently to one another using a common antenna. Using Z38xx, there's almost an order of magnitude difference between the reported ADEVs at 40k seconds (HP:7e-13, Sym:5e-12). Both have 10811 oscillators and are

Re: [time-nuts] GPSDO three cornered comparisons

2012-10-21 Thread Tom Knox
It would be interesting to switch the A and B oscillators. The 10811 spec can vary widely. Thomas Knox Date: Mon, 22 Oct 2012 07:21:08 +1000 From: dho...@gmail.com To: time-nuts@febo.com Subject: [time-nuts] GPSDO three cornered comparisons Hi All, I have an HP 58503A

Re: [time-nuts] GPSDO three cornered comparisons

2012-10-21 Thread Tom Van Baak
I have an HP 58503A and a Symmetricom 58503B which are behaving quite differently to one another using a common antenna. Using Z38xx, there's almost an order of magnitude difference between the reported ADEVs at 40k seconds (HP:7e-13, Sym:5e-12). Both have 10811 oscillators and are Where

Re: [time-nuts] GPSDO three cornered comparisons

2012-10-21 Thread Said Jackson
Instead of Stable32, try Ulrich Bangerts plotter tool, it has a host of stability analysis built in and is easier to use than Stable32 in my opinion. Its also free. Bye Said Sent From iPhone On Oct 21, 2012, at 14:21, David Hooke dho...@gmail.com wrote: Hi All, I have an HP 58503A and a

Re: [time-nuts] GPSDO three cornered comparisons

2012-10-21 Thread David Hooke
Tom, The ADEVs I quoted are from the Z83xx software, so I assume it's comparing time from the GPS system to it's own oscillator's output, in the same way that LH does. I've been monitoring the basic stuff you suggested. It's because I don't have a known reference to compare the units with

Re: [time-nuts] GPSDO three cornered comparisons

2012-10-21 Thread Tom Van Baak
: David Hooke dho...@gmail.com To: time-nuts@febo.com Sent: Sunday, October 21, 2012 4:44 PM Subject: Re: [time-nuts] GPSDO three cornered comparisons Tom, The ADEVs I quoted are from the Z83xx software, so I assume it's comparing time from the GPS system to it's own oscillator's output

Re: [time-nuts] GPSDO three cornered comparisons

2012-10-21 Thread Bill Dailey
, or shall I explain more? Or, if you have some raw data you can send me off-line I'll take a look at it. Thanks, /tvb - Original Message - From: David Hooke dho...@gmail.com To: time-nuts@febo.com Sent: Sunday, October 21, 2012 4:44 PM Subject: Re: [time-nuts] GPSDO three cornered

Re: [time-nuts] GPSDO three cornered comparisons

2012-10-21 Thread Said Jackson
- Original Message - From: David Hooke dho...@gmail.com To: time-nuts@febo.com Sent: Sunday, October 21, 2012 4:44 PM Subject: Re: [time-nuts] GPSDO three cornered comparisons Tom, The ADEVs I quoted are from the Z83xx software, so I assume it's comparing time from the GPS system