[App_rpt-users] Trimble SVeeEight GPS to RTCM

Wed Nov 27 18:45:21 UTC 2013

For just one site I am using a different GPS that also has this 10
microsecond pulse issue.  I have tried a couple of different circuits to
fix it.  I first built a circuit using 2 transistors and that worked
sometimes.  Then I built a 555 circuit and that worked better but still not
perfect.  I am still experimenting with both hardware and software to
improve the results. The biggest problem is with power cycle restart, it is
almost always 1 second off.  Then I do a telnet session to reboot the voter
and it sometimes syncs up with the correct time.  Once I get it synced it
stays synced for months, till the next power interruption reboot, then the
voter will be 1 second off again.  All of my other sites use the Garmin GPS
and they almost always start up fine with both power up and software reboot.
I have verified that the GPS itself is always exactly accurate, it is just
the Voter syncs one second off.
Chuck

On Wed, Nov 27, 2013 at 10:34 AM, Gary Herzog Gmail <kc5daq at gmail.com>wrote:

>
>
> We are trying to interface a Trimble-SVeeEight-Plus to the RTCM. I am
> running the S/W Version: 1.38 10/09/2013 on the RTCM and I am seeing the
> GPS info listed below in Debug mode 32 but I think I may be having issues
> with the PPS. The Trimble indicates that it has a 10 microseconds
> negative going pulse I noticed that the Garmin GPS 78X LVC has a default
> pulse width of 100 milliseconds. I am wondering if the Trimble is too fast
> for the RTCM.. is this going to be a problem?? It appears that I cannot
> adjust the pulse width on the SVeeEight as its grayed out..  any ideas.
> Your help would be greatly appreciated. Thanks Gary Kc5daq..
>
>
>
>
>
> The 1PPS signal is an open collector interface on pin 9 of Ports 1 and 2.
> The polarity of the
>
> PPS signal is an inverted, 10 microseconds negative going pulse with the
> falling edge synchronized to
>
> UTC
>
>
>
> GPS-DEBUG:
> $GPRMC,181436.0,A,3009.798,N,09550.252,W,000.00,000.0,251113,05.5,E*76
>
> GPS-DEBUG: mon: 10, gps_time: 1385403276, ctime: Mon Nov 25 18:14:36 2013
>
> GPS-DEBUG:
> $GPRMC,181437.0,A,3009.798,N,09550.252,W,000.00,000.0,251113,05.5,E*77
>
> GPS-DEBUG: mon: 10, gps_time: 1385403277, ctime: Mon Nov 25 18:14:37 2013
>
> GPS-DEBUG:
> $GPRMC,181438.0,A,3009.798,N,09550.251,W,000.00,000.0,251113,05.5,E*7B
>
> GPS-DEBUG: mon: 10, gps_time: 1385403278, ctime: Mon Nov 25 18:14:38 2013
>
> GPS-DEBUG:
> $GPRMC,181439.0,A,3009.798,N,09550.251,W,000.00,000.0,251113,05.5,E*7A
>
> GPS-DEBUG: mon: 10, gps_time: 1385403279, ctime: Mon Nov 25 18:14:39 2013
>
> GPS-DEBUG:
> $GPRMC,181440.0,A,3009.798,N,09550.251,W,000.00,000.0,251113,05.5,E*74
>
> GPS-DEBUG: mon: 10, gps_time: 1385403280, ctime: Mon Nov 25 18:14:40 2013
>
> GPS-DEBUG:
> $GPRMC,181441.0,A,3009.798,N,09550.251,W,000.00,000.0,251113,05.5,E*75
>
> GPS-DEBUG: mon: 10, gps_time: 1385403281, ctime: Mon Nov 25 18:14:41 2013
>
> GPS-DEBUG:
> $GPRMC,181442.0,A,3009.798,N,09550.251,W,000.00,000.0,251113,05.5,E*76
>
> GPS-DEBUG: mon: 10, gps_time: 1385403282, ctime: Mon Nov 25 18:14:42 2013
>
> GPS-DEBUG:
> $GPRMC,181443.0,A,3009.798,N,09550.250,W,000.00,000.0,251113,05.5,E*76
>
> GPS-DEBUG: mon: 10, gps_time: 1385403283, ctime: Mon Nov 25 18:14:43 2013
>
> GPS-DEBUG:
> $GPRMC,181444.0,A,3009.798,N,09550.250,W,000.00,000.0,251113,05.5,E*71
>
> GPS-DEBUG: mon: 10, gps_time: 1385403284, ctime: Mon Nov 25 18:14:44 2013
>
> GPS-DEBUG:
> $GPRMC,181445.0,A,3009.798,N,09550.250,W,000.00,000.0,251113,05.5,E*70
>
> GPS-DEBUG: mon: 10, gps_time: 1385403285, ctime: Mon Nov 25 18:14:45 2013
>
> GPS-DEBUG:
> $GPRMC,181446.0,A,3009.798,N,09550.250,W,000.00,000.0,251113,05.5,E*73
>
> GPS-DEBUG: mon: 10, gps_time: 1385403286, ctime: Mon Nov 25 18:14:46 2013
>
> GPS-DEBUG:
> $GPRMC,181447.0,A,3009.798,N,09550.250,W,000.00,000.0,251113,05.5,E*72
>
>
>
> Enter Selection (1-27,97-99,r,q,d) :
>
> S/W Version: 1.38 10/09/2013
>
> System Uptime: 1747.0 Secs
>
> IP Address: 192.168.33.80
>
> Netmask: 255.255.255.0
>
> Gateway: 192.168.33.1
>
> Primary DNS: 192.168.33.1
>
> Secondary DNS: 8.8.8.8
>
> DHCP: 0
>
> VOTER Server IP: 192.168.33.60
>
> VOTER Server UDP Port: 667
>
> OUR UDP Port: 667
>
> GPS Lock: 0
>
> Connected: 0
>
> COR: 0
>
> EXT CTCSS IN: 1
>
> PTT: 0
>
> RSSI: 0
>
> Current Samples / Sec.: 0
>
> Current Peak Audio Level: 53448
>
> Squelch Noise Gain Value: 18, Diode Cal. Value: 40, SQL pot 400
>
> Last Rx Pkt System time: <System Time Not Set>, diff: 0 msec
>
> Last Rx Pkt Timestamp time: <System Time Not Set>, diff: 0 msec
>
> Last Rx Pkt index: 0, inbounds: 0
>
>
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>
>
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