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<title>RE: strange Reftek130 timing jumps -1 sec, then + 1 sec hours later
[USGS]</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>If you operate Reftek 130’s, please
read from the bottom up. Because this problem will take months to
address, our solution is to continue waveform acquisition but not to time arrivals.
This will allow us to use the data for ShakeMaps etc should a big quake occur.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-David<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-------------------------------------------------------<br>
David Oppenheimer
office:650.329.4792<br>
U.S. Geological
Survey
fax: 650.329.4732<br>
345 Middlefield Road.-MS 977 email: oppen@usgs.gov<br>
<st1:place w:st="on"><st1:City w:st="on">Menlo Park</st1:City>, <st1:State
w:st="on">CA</st1:State> <st1:PostalCode w:st="on">94025</st1:PostalCode></st1:place>
<o:p></o:p></span></font></p>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Ian Billings
[mailto:I.Billings@reftek.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, August 04, 2008
10:09 AM<br>
<b><span style='font-weight:bold'>To:</span></b> oppen@usgs.gov; Customer
Support<br>
<b><span style='font-weight:bold'>Cc:</span></b> NCSS<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: strange Reftek130
timing jumps -1 sec, then + 1 sec hours later [USGS]</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>David,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>You will be able to do the upg<st1:PersonName
w:st="on">rad</st1:PersonName>e yourselves as it will be a simple replacement
of the 130-GPS/01 unit for the 130-GPS new Garmin unit.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I will have sales send you a quote today.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ian billings.<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><st1:PersonName w:st="on"><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Customer
Service</span></font></st1:PersonName><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> Manager</span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Refraction Technology Inc</span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:address w:st="on"><st1:Street w:st="on"><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>1600 10th Street</span></font></st1:Street><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> <st1:City w:st="on">Plano</st1:City> <st1:State w:st="on">TX</st1:State>
<st1:PostalCode w:st="on">75074</st1:PostalCode> <st1:country-region w:st="on">USA</st1:country-region></span></font></st1:address><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ph 214 440-1265 or 214 440-1289 (direct)</span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><a href="http://www.reftek.com">www.reftek.com</a>
<a href="ftp://ftp.reftek.com">ftp.reftek.com</a></span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><strong><b><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'>“</span></font></b></strong><font
size=2 color=black><span style='font-size:10.0pt;color:black'>Want to become an
expert with <strong><b><font face="Times New Roman">REF TEK</font></b></strong>
equipment? Attend our <st1:place w:st="on"><st1:PlaceName w:st="on"><strong><b><font
face="Times New Roman">REF</font></b></strong></st1:PlaceName><strong><b><font
face="Times New Roman"> <st1:PlaceName w:st="on">TEK</st1:PlaceName> <st1:PlaceType
w:st="on">University</st1:PlaceType></font></b></strong></st1:place>.
Follow the link on our web site<strong><b><font face="Times New Roman">
www.reftek.com”</font></b></strong></span></font><font size=2
color="#993300" face="Arial Black"><span style='font-size:11.0pt;font-family:
"Arial Black";color:#993300'><o:p></o:p></span></font></p>
</div>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> David
Oppenheimer [mailto:oppen@usgs.gov] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, August 04, 2008
12:06 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Ian Billings; Customer Support<br>
<b><span style='font-weight:bold'>Cc:</span></b> 'NCSS'<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: strange Reftek130
timing jumps -1 sec, then + 1 sec hours later [USGS]</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Ian,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I’ll ok for the purchase of the
clock replacements without input from <st1:place w:st="on"><st1:City w:st="on">Lynn</st1:City></st1:place>
and others since they are out on vacation this week. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Can we do the upg<st1:PersonName w:st="on">rad</st1:PersonName>e
or must we return all the instruments to Reftek? If the latter, will there be
additional charges? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The amount of this purchase exceeds our
credit card limit, so I’ll have to do a purchase order. Can you send me
an official quote? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-David<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-------------------------------------------------------<br>
<st1:PersonName w:st="on">David Oppenheimer</st1:PersonName>
office:650.329.4792<br>
U.S. Geological
Survey
fax: 650.329.4732<br>
345 Middlefield Road.-MS 977 email: <st1:PersonName w:st="on">oppen@usgs.<st1:PersonName
w:st="on">gov</st1:PersonName></st1:PersonName><br>
<st1:place w:st="on"><st1:City w:st="on">Menlo Park</st1:City>, <st1:State
w:st="on">CA</st1:State> <st1:PostalCode w:st="on">94025</st1:PostalCode></st1:place>
<o:p></o:p></span></font></p>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Ian Billings
[mailto:I.Billings@reftek.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, August 04, 2008 6:16
AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Lynn
Dietz</st1:PersonName>; Customer Support<br>
<b><span style='font-weight:bold'>Cc:</span></b> <st1:PersonName w:st="on">oppen@usgs.<st1:PersonName
w:st="on">gov</st1:PersonName></st1:PersonName>; <st1:PersonName w:st="on">croker@usgs.<st1:PersonName
w:st="on">gov</st1:PersonName></st1:PersonName>; kohler@usgs.<st1:PersonName
w:st="on">gov</st1:PersonName>; macbeth@usgs.<st1:PersonName w:st="on">gov</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: strange Reftek130
timing jumps -1 sec, then + 1 sec hours later [USGS]</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div id=idOWAReplyText54824>
<div>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>Lynn</span></font></st1:City></st1:place><font size=2
color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'>,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The GPS clocks, SiRF, are the problem here. The 130
will try to keep correcting for the time jumps but can only go off what the
clock is telling it.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The only real solution here is to replace all the SiRF
clocks, 36, with Garmin clocks. It has been 2yrs since we were told by
SiRF that there will be no upg<st1:PersonName w:st="on">rad</st1:PersonName>e
to the firmware to solve the problems you are seeing therefore the only thing
we can do is offer the Garmin GPS at our cost of $170 each.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Please let me know what you decide or if you need to discuss
this timing problem further.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Best regards,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Ian Billings.</span></font><o:p></o:p></p>
</div>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> <st1:PersonName
w:st="on">Lynn Dietz</st1:PersonName> [mailto:dietz@usgs.<st1:PersonName w:st="on">gov</st1:PersonName>]<br>
<b><span style='font-weight:bold'>Sent:</span></b> Fri 8/1/2008 5:16 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Ian Billings; Customer Support<br>
<b><span style='font-weight:bold'>Cc:</span></b> <st1:PersonName w:st="on">oppen@usgs.<st1:PersonName
w:st="on">gov</st1:PersonName></st1:PersonName>; <st1:PersonName w:st="on">croker@usgs.<st1:PersonName
w:st="on">gov</st1:PersonName></st1:PersonName>; kohler@usgs.<st1:PersonName
w:st="on">gov</st1:PersonName>; macbeth@usgs.<st1:PersonName w:st="on">gov</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: strange Reftek130
timing jumps -1 sec, then + 1 sec hours later [USGS]</span></font><o:p></o:p></p>
</div>
<div>
<p><font size=2 face="Times New Roman"><span style='font-size:10.0pt'>After
getting RTPD to write to its archive again, I compiled a<br>
spreadsheet (attached) lising all of our Reftek130 stations,<br>
their firmware, GPS clock type and whether they shifted<br>
time -1s on 2008/07/31.<br>
<br>
Note that we have 56 Refteks deployed:<br>
36 are using SiRF GPS and they all shifted by -1 s<br>
17 are using Garmin GPS and none had a time shift<br>
3 are offline or have no GPS signal<br>
<br>
After the initial -1 s shift, most units shifted back +1 sec on<br>
7/31 1900ish UTC (a few did not), then -1 s on 8/1 0100ish UTC.<br>
It's now 8/1 2200 UTC, and there has not been a +1s shift back,<br>
so it appears that all of our SiRF Refteks are running 1 second off.<br>
Earthquake arrival residuals for a unit at Geysers seem to confirm<br>
this (-1 s for GDXB). I haven't checked residuals for other stations.<br>
<br>
I am leaving for vacation tomorrow and I'm not sure if anyone else<br>
will be able to follow this while I'm gone.<br>
<br>
<st1:PersonName w:st="on">Lynn Dietz</st1:PersonName><br>
<br>
<br>
At 01:05 PM 8/1/2008, <st1:PersonName w:st="on">Lynn Dietz</st1:PersonName>
wrote:<br>
>I found the SOH from a datalogger (NC.NLH, DAS 9581) that did the<br>
>timeshift both 7/31 and 8/1. The SOH from 7/31 is attached.<br>
><br>
>20080731_UTC_01:10:04 reftek2ew(9): Error: Starttime of tracebuf<br>
>earlier than last timestamp: (NLH HNZ NC --) 1217466588.710 -<br>
>1217466597.620, 892, 100.0, lp 1217466589.700 (9581 S0 C0)<br>
>20080801_UTC_01:05:00 reftek2ew(9): Error: Starttime of tracebuf<br>
>earlier than last timestamp: (NLH HNZ NC --) 1217552685.430 -<br>
>1217552694.340, 892, 100.0, lp 1217552686.420 (9581 S0 C0)<br>
><br>
><st1:place w:st="on"><st1:City w:st="on">Lynn</st1:City></st1:place><br>
><br>
><br>
>At 12:20 PM 8/1/2008, Ian Billings wrote:<br>
>>Thanks <st1:place w:st="on"><st1:City w:st="on">Lynn</st1:City></st1:place>,<br>
>><br>
>>Yes we would be very interested in any SOH files you may have in the<br>
>>future. My guess is the stations behaving like this have the SiRF<br>
>>Trimble type, 130-GPS/01, which has suffered in the past with second<br>
>>jumps due to its firmware. There is no fix to this firmware<br>
>>unfortunately.<br>
>><br>
>>SOH information shows "GPS TYPE NEMA" for a SiRF type module
and "GPS<br>
>>TYPE NEMA Garmin" for the Garmin type which has regular firmware<br>
>>updates, currently at 4.30<br>
>><br>
>>Later 130 code 2.8.8 checks for time discrepancies and corrects them if<br>
>>they are constant for more than 3hrs.<br>
>><br>
>>SOH files will definitely help us with this problem.<br>
>><br>
>>Ian.<br>
>><st1:PersonName w:st="on">Customer Service</st1:PersonName> Manager<br>
>>Refraction Technology Inc<br>
>><st1:address w:st="on"><st1:Street w:st="on">1600 10th Street</st1:Street>
<st1:City w:st="on">Plano</st1:City> <st1:State w:st="on">TX</st1:State> <st1:PostalCode
w:st="on">75074</st1:PostalCode> <st1:country-region w:st="on">USA</st1:country-region></st1:address><br>
>>Ph 214 440-1265 or 214 440-1289 (direct)<br>
>>www.reftek.com ftp.reftek.com<br>
>>"Want to become an expert with REF TEK equipment? Attend our
REF TEK<br>
>>University. Follow the link on our web site www.reftek.com"<br>
>>-----Original Message-----<br>
>>From: <st1:PersonName w:st="on">Lynn Dietz</st1:PersonName> [<a
href="mailto:dietz@usgs.gov">mailto:dietz@usgs.gov</a>]<br>
>>Sent: Friday, August 01, 2008 1:50 PM<br>
>>To: Customer Support<br>
>>Cc: <st1:PersonName w:st="on">oppen@usgs.<st1:PersonName w:st="on">gov</st1:PersonName></st1:PersonName><br>
>>Subject: strange Reftek130 timing jumps -1 sec, then + 1 sec hours
later<br>
>><br>
>>For the last 2 days, I've noticed some strange coincidental timing<br>
>>shifts on a large number of our Reftek130s. We have many Reftek<br>
>>acquisition systems; I've checked two of them and about 15 of 26<br>
>>units have displayed this behavior. I expect that many more DASes<br>
>>on the other acquisition systems are behaving the same way.<br>
>><br>
>>On 2008/07/30 everything is normal.<br>
>>Starting near 2008/07/31 0100 UTC, many units shifted time by -1 sec.<br>
>>Then around 2008/07/31 1900 UTC, they shifted time back +1
sec.<br>
>>Again around 2008/08/01 0100 UTC, they shifted -1 sec again.<br>
>>It's almost 1900 UTC, we'll see if they shift back.<br>
>><br>
>>The timeshifts were noted in my reftek2ew and Earthworm gaplist<br>
>>logs. I've attached a file containing semi-sorted log info for<br>
>>one channel of each misbehaving Reftek130 datalogger.<br>
>><br>
>>Unfortunately, RTPD had stopped writing to its archive, so I don't<br>
>>have SOH for any of the units. The dataloggers don't appear to have<br>
>>a backup of SOH either (only trigger files). I just restarted the<br>
>>archive, so if the jumps happen again, I'll be able to send you SOH.<br>
>><br>
>>I don't know if it's related, but the GPS almanac was updated on<br>
>>2008/07/28 1600ish UTC to include information about the up-coming<br>
>>leap second, and we are seeing -1 sec time issues on some other<br>
>>vendor's dataloggers since that time.<br>
>><br>
>><st1:PersonName w:st="on">Lynn Dietz</st1:PersonName><br>
>><br>
>>_______________________________________________________<br>
>><st1:PersonName w:st="on">Lynn Dietz</st1:PersonName>
email: dietz@usgs.<st1:PersonName w:st="on">gov</st1:PersonName><br>
>>U.S. Geological
Survey
phone: 650-329-5520<br>
>><st1:Street w:st="on"><st1:address w:st="on">345 Middlefield Rd</st1:address></st1:Street>
- MS 977 fax:
650-329-4732<br>
>><st1:place w:st="on"><st1:City w:st="on">Menlo Park</st1:City>, <st1:State
w:st="on">CA</st1:State> <st1:PostalCode w:st="on">94025</st1:PostalCode></st1:place></span></font><o:p></o:p></p>
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