Re: [time-nuts] Holdover recovery

2016-04-04 Thread Azelio Boriani
Yes, very interesting, good to have. I see differences: the most notable is the plot of page 12 on the original italian version that is missing on the ITU paper, that goes with the figure 4 on page 7 (of the ITU one). On Tue, Apr 5, 2016 at 12:57 AM, Magnus Danielson

Re: [time-nuts] Holdover recovery

2016-04-04 Thread Magnus Danielson
Hi, I had not seen the ITU-R version, nice. I have their paper and shared it with Hal on the side. This ITU-R version seems about the same, but I've got their names on it. I got a copy of their paper in english without their names on it, which might have been their input contribution to

Re: [time-nuts] Holdover recovery

2016-04-04 Thread Bob Camp
Hi On a surplus cell phone GPSDO it’s going to be: 1) System has been down for a while (= something failed) 2) System is now working ( = something was fixed) 3) The primary system spec must now be met (+/- 100 ns time alignment). 4) The secondary system spec should be met (+/- 5x10^-8

Re: [time-nuts] Holdover recovery

2016-04-04 Thread Logan Cummings
My Italian is not very good, but I think this is the English translation via ITU: https://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BT.2253-2012-PDF-E.pdf -Logan On Mon, Apr 4, 2016 at 1:10 PM, wrote: > Here the italian version: > >

Re: [time-nuts] Holdover recovery

2016-04-04 Thread Azelio Boriani
The only english text I'm able to find is: Analysis of the GPS frequency reference stability Laboratory analysis of the dynamic behaviour of some GPS receivers has allowed to identify a criticality in their use as ‘clocks’ to synchronize DVB-T SFN networks. To fix this criticality, the Research

Re: [time-nuts] Holdover recovery

2016-04-04 Thread timeok
Here the italian version: http://www.crit.rai.it/eletel/2012-1/121-2.pdf Luciano www.timeok.it On Mon 04/04/16 21:28 , Magnus Danielson wrote: > Hi Hal, > > On 04/04/2016 05:39 AM, Hal Murray wrote: > > > > Has anybody studied what happens when a GPSDO comes out

Re: [time-nuts] Holdover recovery

2016-04-04 Thread Azelio Boriani
In italian: Can't find it in english... On Mon, Apr 4, 2016 at 9:28 PM, Magnus Danielson wrote: > Hi Hal, > > On 04/04/2016 05:39 AM, Hal Murray wrote: >> >> >> Has anybody studied what happens when a GPSDO comes out of

Re: [time-nuts] Holdover recovery

2016-04-04 Thread Magnus Danielson
Hi Hal, On 04/04/2016 05:39 AM, Hal Murray wrote: Has anybody studied what happens when a GPSDO comes out of holdover? Has anybody seen any specs? I don't think I have. I think you have a choice of quick recovery for time or frequency, but you can't get both. Suppose your setup has been in

Re: [time-nuts] Holdover recovery

2016-04-04 Thread jimlux
On 4/3/16 8:39 PM, Hal Murray wrote: Has anybody studied what happens when a GPSDO comes out of holdover? Has anybody seen any specs? I don't think I have. I think you have a choice of quick recovery for time or frequency, but you can't get both. Suppose your setup has been in holdover for

Re: [time-nuts] Holdover recovery

2016-04-04 Thread Mike Cook
> Le 4 avr. 2016 à 05:39, Hal Murray a écrit : > > > Has anybody studied what happens when a GPSDO comes out of holdover? Has > anybody seen any specs? I don't think I have. > > I think you have a choice of quick recovery for time or frequency, but you > can't get

Re: [time-nuts] Holdover recovery

2016-04-04 Thread Tim Shoppa
The chinese GPSDO's famous on E-bay are not really phase locked to begin with, they are only frequency locked and often with a small frequency offset. I don't think any of your questions apply to this kind of unit. See e.g. http://www.ke5fx.com/gpscomp.htm Units that have been spec'ed for

[time-nuts] Holdover recovery

2016-04-04 Thread Hal Murray
Has anybody studied what happens when a GPSDO comes out of holdover? Has anybody seen any specs? I don't think I have. I think you have a choice of quick recovery for time or frequency, but you can't get both. Suppose your setup has been in holdover for a while. The frequency is slightly