Re: [time-nuts] TIC resolution impact on GPSDO's performance

2006-12-27 Thread Magnus Danielson
From: Dr Bruce Griffiths <[EMAIL PROTECTED]> Subject: Re: [time-nuts] TIC resolution impact on GPSDO's performance Date: Thu, 28 Dec 2006 17:33:19 +1300 Message-ID: <[EMAIL PROTECTED]> > Didier > > Yes, using an integrated high stability oscillator in the GPS receiver > provides all the local osc

[time-nuts] RFTG-m-RB on eBay

2006-12-27 Thread Jack Hudler
Well he hasn't any pictures (just ask for some). Does anyone know what the output frequency is? What shape the Rubidium would be in? Thanks, Jack -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bill Hawkins Sent: Tuesday, December 26, 2006 10:06 PM To: '

Re: [time-nuts] TIC resolution impact on GPSDO's performance

2006-12-27 Thread Dr Bruce Griffiths
Didier Juges wrote: > Dr Bruce Griffiths wrote: > >> Didier Juges wrote: >> >> >>> Hi David, >>> >>> David I. Emery wrote: >>> >>> >>> On Tue, Dec 26, 2006 at 04:14:45PM -0600, Didier Juges wrote: > When reading the

Re: [time-nuts] TIC resolution impact on GPSDO's performance

2006-12-27 Thread Didier Juges
Dr Bruce Griffiths wrote: > Dr Bruce Griffiths wrote: > >> Dr Bruce Griffiths wrote: >> >> >>> Didier Juges wrote: >>> >>> >>> Hi David, David I. Emery wrote: > On Tue, Dec 26, 2006 at 04:14:45PM -0600, Didier

Re: [time-nuts] TIC resolution impact on GPSDO's performance

2006-12-27 Thread Didier Juges
Dr Bruce Griffiths wrote: > Didier Juges wrote: > >> Hi David, >> >> David I. Emery wrote: >> >> >>> On Tue, Dec 26, 2006 at 04:14:45PM -0600, Didier Juges wrote: >>> >>> >>> >>> When reading the data sheet for the Thunderbolt, and reading all the pitfalls assoc

Re: [time-nuts] RFTG-m-XO disassembly photos

2006-12-27 Thread Jason Rabel
Very nice pictures! My RFTG-m-RB was waiting by the back door today when I got home. I *just* took it apart, and surprise surprise inside is an Efratom LPRO-101 inside... Not a Freq Elec whatever model, I guess maybe it must be a different revision or something? The boards inside look nearly the

Re: [time-nuts] TIC resolution impact on GPSDO's performance

2006-12-27 Thread Dr Bruce Griffiths
Dr Bruce Griffiths wrote: > Dr Bruce Griffiths wrote: > >> Didier Juges wrote: >> >> >>> Hi David, >>> >>> David I. Emery wrote: >>> >>> >>> On Tue, Dec 26, 2006 at 04:14:45PM -0600, Didier Juges wrote: > When readi

Re: [time-nuts] TIC resolution impact on GPSDO's performance

2006-12-27 Thread Dr Bruce Griffiths
Dr Bruce Griffiths wrote: > Didier Juges wrote: > >> Hi David, >> >> David I. Emery wrote: >> >> >>> On Tue, Dec 26, 2006 at 04:14:45PM -0600, Didier Juges wrote: >>> >>> >>> >>> When reading the data sheet for the Thunderbolt, and reading all the pitfalls assoc

Re: [time-nuts] TIC resolution impact on GPSDO's performance

2006-12-27 Thread Dr Bruce Griffiths
Didier Juges wrote: > Hi David, > > David I. Emery wrote: > >> On Tue, Dec 26, 2006 at 04:14:45PM -0600, Didier Juges wrote: >> >> >> >>> When reading the data sheet for the Thunderbolt, and reading all the >>> pitfalls associated with non-integrated GPSDO designs using stand alone >>>

Re: [time-nuts] New frequency stability measure

2006-12-27 Thread Robert Lutwak
(Shameless plug for my friend Bill Riley and his awesome Stable32 software) Both TheoH and Theo1 have been easily available in the last few upgrades of Stable32. I believe Bill Riley was coauthor on some of the early papers with David Howe of NIST. Like all stability predictors, use Theo with

[time-nuts] New frequency stability measure

2006-12-27 Thread Dr Bruce Griffiths
Has anyone used the new frequency stability measure reported in http://www.tf.nist.gov/timefreq/general/pdf/2109.pdf It allows somewhat quicker determination of long term frequency stability characteristics than using the Allan variance or its derivatives. Bruce ___

Re: [time-nuts] RFTG-m-XO disassembly photos

2006-12-27 Thread John Ackermann N8UR
Dr Bruce Griffiths said the following on 12/27/2006 04:35 PM: > John Ackermann N8UR wrote: >> The 15MHz out surprised me to. I haven't traced out the circuits but >> from a couple of the components, I am guessing that they do something >> like take the 3rd harmonic of the 10MHz OCXO and dividing t

Re: [time-nuts] RFTG-m-XO disassembly photos

2006-12-27 Thread Dr Bruce Griffiths
John Ackermann N8UR wrote: > The 15MHz out surprised me to. I haven't traced out the circuits but > from a couple of the components, I am guessing that they do something > like take the 3rd harmonic of the 10MHz OCXO and dividing that by 2. > John That is not likely to be the scheme used, as t

Re: [time-nuts] TIC resolution impact on GPSDO's performance

2006-12-27 Thread Didier Juges
David I. Emery wrote: > On Tue, Dec 26, 2006 at 04:14:45PM -0600, Didier Juges wrote: > > >> When reading the data sheet for the Thunderbolt, and reading all the >> pitfalls associated with non-integrated GPSDO designs using stand alone >> GPS receivers, such as sawtooth correction and quantiz

Re: [time-nuts] TIC resolution impact on GPSDO's performance

2006-12-27 Thread Didier Juges
Hi David, David I. Emery wrote: > On Tue, Dec 26, 2006 at 04:14:45PM -0600, Didier Juges wrote: > > >> When reading the data sheet for the Thunderbolt, and reading all the >> pitfalls associated with non-integrated GPSDO designs using stand alone >> GPS receivers, such as sawtooth correction

Re: [time-nuts] TIC resolution impact on GPSDO's performance

2006-12-27 Thread John Ackermann N8UR
David I. Emery said the following on 12/27/2006 01:21 AM: > I have ordered a Lucent RFTG-M-XO box but it has yet to arrive - > however, looking at the photos published today, it does not seem clear > they don't use a GPS receiver with an external clock. Not easy to tell > since the guts of

Re: [time-nuts] RFTG-m-XO disassembly photos

2006-12-27 Thread John Ackermann N8UR
The 15MHz out surprised me to. I haven't traced out the circuits but from a couple of the components, I am guessing that they do something like take the 3rd harmonic of the 10MHz OCXO and dividing that by 2. However, it also looks like it should be easy to bypass that stuff and get right to the 10

Re: [time-nuts] RFTG-m-XO disassembly photos

2006-12-27 Thread bg
On Wed, December 27, 2006 11:30, Rex said: > On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" <[EMAIL PROTECTED]> > wrote: > >>What's all this about 15 MHz out? >> >>Bill Hawkins > > I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It > came in a metal box that also contained a

Re: [time-nuts] RFTG-m-XO disassembly photos

2006-12-27 Thread Dr Bruce Griffiths
Dr Bruce Griffiths wrote: > Rex wrote: > >> On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" <[EMAIL PROTECTED]> >> wrote: >> >> >> >>> What's all this about 15 MHz out? >>> >>> Bill Hawkins >>> >>> >> I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It >

Re: [time-nuts] RFTG-m-XO disassembly photos

2006-12-27 Thread Dr Bruce Griffiths
Rex wrote: > On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" <[EMAIL PROTECTED]> > wrote: > > >> What's all this about 15 MHz out? >> >> Bill Hawkins >> > > I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It > came in a metal box that also contained a circuit board th

Re: [time-nuts] RFTG-m-XO disassembly photos

2006-12-27 Thread Rex
On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" <[EMAIL PROTECTED]> wrote: >What's all this about 15 MHz out? > >Bill Hawkins I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It came in a metal box that also contained a circuit board that provided 3 TNC output connectors. Tw

Re: [time-nuts] TIC resolution impact on GPSDO's performance

2006-12-27 Thread Ulrich Bangert
Didier, looking at your plots, i see that your 'Tau'on the main page is set to 0.5 instead of 2 as it should be with your measurement arrangement. I understand that due to the unity '/s' you were fooled into thinking that you need to compute a '1/2' sample rate from your measurement arrangemant.