[time-nuts] NTP REFCLOCK for a Jackson Fury??

[Bill Dailey]

It looks like in this Ubuntu I am using 28 SHM with gpsd which is different that the soekris.

Sent from mobile

> On Oct 17, 2013, at 1:00 PM, Scott Mace <smace at intt.net> wrote:
> 
> I think the Fury does not guarantee that the PTIME:TCODE will be near the 1-PPS leading edge.  When I tried it with the HPGPS driver and a net4501, ntpd wasn't happy with it.  I also needed leap second processing to work, holdover notification, and to collect other data from it.  The GPGGA sentence is on-time even if you are asking the Fury to do other things with SCPI commands.  Try setting your Fury hpgps driver fudge flag4 to 1 and I bet it will stop working well.  This flag logs the system:print output.
> 
>    Scott
> 
>> On 10/17/2013 10:24 AM, Bill Dailey wrote:
>> Interesting.. I see something completely different with my Fury.
>> 
>> My hard-coded fudge factor is 0.077 yielding:
>> 
>> Every 2.0s: ntpq -p                                     Thu Oct 17 10:20:00
>> 2013
>> 
>>      remote           refid      st t when poll reach   delay   offset
>> jitter
>> ==============================================================================
>> -four2.fairy.mat 64.250.177.145   2 u   12   64  377   72.493   17.784
>> 0.524
>> -66-162-15-65.li 64.236.96.53     2 u   33   64  377   50.226   15.291
>> 1.181
>> +barricade.rack9 209.51.161.238   2 u   10   64  377   22.908    1.075
>> 0.362
>> -ccadmin.cycores 130.207.244.240  2 u   38   64  377   39.218    3.972
>> 1.241
>>  192.168.1.171   .INIT.          16 u    - 1024    0    0.000    0.000
>> 0.000
>> +SHM(0)          .FURY.           0 l    6   16  377    0.000    0.526
>> 0.034
>> *SHM(1)          .PPSF.           0 l    5   64  377    0.000    0.008
>> 0.001
>> -europium.canoni 193.79.237.14    2 u   32   64  377  116.177   -1.573
>> 0.992
>> 
>> So... i could fine tune my fudge some but the point is the jitter is fairly
>> low.  (fury is from the sentences and ppsf is pps from fury).
>> 
>> My soekris (soekris is the .171) numbers were much better but it is
>> inoperable for some reason.
>> 
>> Doc
>> 
>> 
>>> On Thu, Oct 17, 2013 at 9:59 AM, Tim Shoppa <tshoppa at gmail.com> wrote:
>>> 
>>> Back in 2003 or so, in the Z3801A with hpgps ntpd refclock driver, I had to
>>> add a negative offset of -0.98 seconds to the driver's decoding of
>>> PTIME:TCODE? to get it to be right in combination with PPS refclock.
>>> 
>>> The documentation in the Z3801A manual correctly described the actual
>>> behavior.... "PTIME:TCODE? Provides timecode message 980 to 20 ms prior to
>>> 1 PPS of indicated time".
>>> 
>>> 
>>> 
>>>> On Thu, Oct 17, 2013 at 9:40 AM, Scott Mace <smace at intt.net> wrote:
>>>> 
>>>> I posted a patch for the Fury to work with ntpd in Oct 2008.  It uses the
>>>> GPGGA output.  The PTIME:TCODE? command is not "on-time" with the 1-PPS
>>>> output on the Fury, so the HPGPS driver does not work.
>>>> 
>>>> http://www.febo.com/pipermail/**time-nuts/2008-October/033901.**html<
>>> http://www.febo.com/pipermail/time-nuts/2008-October/033901.html>
>>>> 
>>>> the ntp-fury.diff:
>>>> http://www.febo.com/pipermail/**time-nuts/attachments/**
>>>> 20081020/846021fe/attachment-**0001.bin<
>>> http://www.febo.com/pipermail/time-nuts/attachments/20081020/846021fe/attachment-0001.bin
>>>> 
>>>> 
>>>> 
>>>>         Scott
>>>> 
>>>> 
>>>> 
>>>>> On 10/16/2013 04:44 PM, Frank Hughes wrote:
>>>>> 
>>>>> Hi,
>>>>> 
>>>>> What NTP REFCLOCK can be used for a Jackson Fury?
>>>>> 
>>>>> I know that the Jackson Fury docs suggest using:
>>>>> http://www.realhamradio.com/**gpscon-info.htm<
>>> http://www.realhamradio.com/gpscon-info.htm>
>>>>> 
>>>>> But that means I would have to put up a windows server
>>>>> to replace the FreeBSD ntpd server I built for use w/ the Trimble TB.
>>>>> 
>>>>> Looking for open source options, if possible.
>>>>> 
>>>>> Thanks,
>>>>> Frank
>>>>> KJ4OLL
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