<div dir="ltr">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.<div>
I have verified that the GPS itself is always exactly accurate, it is just the Voter syncs one second off.</div><div>Chuck</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Nov 27, 2013 at 10:34 AM, Gary Herzog Gmail <span dir="ltr"><<a href="mailto:kc5daq@gmail.com" target="_blank">kc5daq@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">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 <span style="font-family:"Times New Roman","serif"">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<span style="color:#1f497d"> </span></span>SVeeEight<span style="font-family:"Times New Roman","serif""> as its grayed out.. any ideas. Your help would be greatly appreciated. Thanks Gary Kc5daq.. </span><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Times New Roman","serif"">The 1PPS signal is an open collector interface on pin 9 of Ports 1 and 2. The polarity of the<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Times New Roman","serif"">PPS signal is an inverted, 10 microseconds negative going pulse with the falling edge synchronized to<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman","serif"">UTC<u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Times New Roman","serif""><u></u> <u></u></span></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181436.0,A,3009.798,N,09550.252,W,000.00,000.0,251113,05.5,E*76<u></u><u></u></p><p class="MsoNormal">GPS-DEBUG: mon: 10, gps_time: 1385403276, ctime: Mon Nov 25 18:14:36 2013<u></u><u></u></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181437.0,A,3009.798,N,09550.252,W,000.00,000.0,251113,05.5,E*77<u></u><u></u></p><p class="MsoNormal">GPS-DEBUG: mon: 10, gps_time: 1385403277, ctime: Mon Nov 25 18:14:37 2013<u></u><u></u></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181438.0,A,3009.798,N,09550.251,W,000.00,000.0,251113,05.5,E*7B<u></u><u></u></p><p class="MsoNormal">GPS-DEBUG: mon: 10, gps_time: 1385403278, ctime: Mon Nov 25 18:14:38 2013<u></u><u></u></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181439.0,A,3009.798,N,09550.251,W,000.00,000.0,251113,05.5,E*7A<u></u><u></u></p><p class="MsoNormal">GPS-DEBUG: mon: 10, gps_time: 1385403279, ctime: Mon Nov 25 18:14:39 2013<u></u><u></u></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181440.0,A,3009.798,N,09550.251,W,000.00,000.0,251113,05.5,E*74<u></u><u></u></p><p class="MsoNormal">GPS-DEBUG: mon: 10, gps_time: 1385403280, ctime: Mon Nov 25 18:14:40 2013<u></u><u></u></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181441.0,A,3009.798,N,09550.251,W,000.00,000.0,251113,05.5,E*75<u></u><u></u></p><p class="MsoNormal">GPS-DEBUG: mon: 10, gps_time: 1385403281, ctime: Mon Nov 25 18:14:41 2013<u></u><u></u></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181442.0,A,3009.798,N,09550.251,W,000.00,000.0,251113,05.5,E*76<u></u><u></u></p><p class="MsoNormal">GPS-DEBUG: mon: 10, gps_time: 1385403282, ctime: Mon Nov 25 18:14:42 2013<u></u><u></u></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181443.0,A,3009.798,N,09550.250,W,000.00,000.0,251113,05.5,E*76<u></u><u></u></p><p class="MsoNormal">GPS-DEBUG: mon: 10, gps_time: 1385403283, ctime: Mon Nov 25 18:14:43 2013<u></u><u></u></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181444.0,A,3009.798,N,09550.250,W,000.00,000.0,251113,05.5,E*71<u></u><u></u></p><p class="MsoNormal">GPS-DEBUG: mon: 10, gps_time: 1385403284, ctime: Mon Nov 25 18:14:44 2013<u></u><u></u></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181445.0,A,3009.798,N,09550.250,W,000.00,000.0,251113,05.5,E*70<u></u><u></u></p><p class="MsoNormal">GPS-DEBUG: mon: 10, gps_time: 1385403285, ctime: Mon Nov 25 18:14:45 2013<u></u><u></u></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181446.0,A,3009.798,N,09550.250,W,000.00,000.0,251113,05.5,E*73<u></u><u></u></p><p class="MsoNormal">GPS-DEBUG: mon: 10, gps_time: 1385403286, ctime: Mon Nov 25 18:14:46 2013<u></u><u></u></p>
<p class="MsoNormal">GPS-DEBUG: $GPRMC,181447.0,A,3009.798,N,09550.250,W,000.00,000.0,251113,05.5,E*72<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Enter Selection (1-27,97-99,r,q,d) :<u></u><u></u></p>
<p class="MsoNormal">S/W Version: 1.38 10/09/2013<u></u><u></u></p><p class="MsoNormal">System Uptime: 1747.0 Secs<u></u><u></u></p><p class="MsoNormal">IP Address: 192.168.33.80<u></u><u></u></p><p class="MsoNormal">Netmask: 255.255.255.0<u></u><u></u></p>
<p class="MsoNormal">Gateway: 192.168.33.1<u></u><u></u></p><p class="MsoNormal">Primary DNS: 192.168.33.1<u></u><u></u></p><p class="MsoNormal">Secondary DNS: 8.8.8.8<u></u><u></u></p><p class="MsoNormal">DHCP: 0<u></u><u></u></p>
<p class="MsoNormal">VOTER Server IP: 192.168.33.60<u></u><u></u></p><p class="MsoNormal">VOTER Server UDP Port: 667<u></u><u></u></p><p class="MsoNormal">OUR UDP Port: 667<u></u><u></u></p><p class="MsoNormal"><span style="color:red">GPS Lock: 0<u></u><u></u></span></p>
<p class="MsoNormal">Connected: 0<u></u><u></u></p><p class="MsoNormal">COR: 0<u></u><u></u></p><p class="MsoNormal">EXT CTCSS IN: 1<u></u><u></u></p><p class="MsoNormal">PTT: 0<u></u><u></u></p><p class="MsoNormal">RSSI: 0<u></u><u></u></p>
<p class="MsoNormal">Current Samples / Sec.: 0<u></u><u></u></p><p class="MsoNormal">Current Peak Audio Level: 53448<u></u><u></u></p><p class="MsoNormal">Squelch Noise Gain Value: 18, Diode Cal. Value: 40, SQL pot 400<u></u><u></u></p>
<p class="MsoNormal">Last Rx Pkt System time: <System Time Not Set>, diff: 0 msec<u></u><u></u></p><p class="MsoNormal">Last Rx Pkt Timestamp time: <System Time Not Set>, diff: 0 msec<u></u><u></u></p><p class="MsoNormal">
Last Rx Pkt index: 0, inbounds: 0<u></u><u></u></p><p class="MsoNormal"><img width="782" height="858" src="cid:image001.png@01CEEB5C.3FAF1340"><u></u><u></u></p></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br></div></div>