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@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
_______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
