[App_rpt-users] Trimble SVeeEight GPS to RTCM

Wed Nov 27 18:54:47 UTC 2013

Hmm interesting thanks for the info yes I would use the Garmin but I have 25
of these Trimble units that I would hate not to be able to use them I wonder
if there is anything in the TRCM that could be tuned to enable the 10
microsecond pulse? 

Thanks for your response. 

From: Chuck Henderson [mailto:rpt2 at chuck.midlandsnetworking.com] 
Sent: Wednesday, November 27, 2013 12:45 PM
To: Gary Herzog Gmail
Cc: app_rpt mailing list
Subject: Re: [App_rpt-users] Trimble SVeeEight GPS to RTCM

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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