[time-nuts] Synergy-GPS SSR-6tru problems

Bob Stewart bob at evoria.net
Tue Jul 15 19:32:14 EDT 2014


I don't see that your response is relevant.  This board uses the ublox 
command set.  I mentioned the UT+ only in context of the hardware.  It 
plugs into the same socket on my GPSDO.  When the UT+ is in, I can 
control it with WinOncore 12 software with no problems.  When the 
SSR-6tru is plugged in, I am trying to use ublox u-center 8.11 software to control it.  It is deaf to all commands, and I do not see a reason.  I have an expired version of your SynTac program and it complains of 
comms errors, though it then happily displays the satellite signal 
strength; probably from the NMEA broadcasts.  I have brought up your 
SynTac software in a new Windows XP virtual box so that it is not 
expired.  It is not able to control the SSR-6tru.

I do not know what the problem is.  The UT+ works (with the appropriate software).  The SSR-6tru is deaf using all the software I have available to me.  I am at my wits end, and I have nothing else that I can think of to try.

I did not open this thread to start an argument with Synergy-GPS.  I was 
hoping to get input from someone else who had installed this board with 
the adapter board and had it working or even who had experienced 


 From: Art Sepin <art at synergy-gps.com>
To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at febo.com> 
Sent: Tuesday, July 15, 2014 5:58 PM
Subject: RE: [time-nuts] Synergy-GPS SSR-6tru problems


One of the most obvious things is that the UT+ uses 8 channel Motorola binary commands with the @@Ea Position Status Data command producing the most useful data at start-up. The UT+ did not have a NMEA message capability.

Another obvious thing is that the UT+ is an 8 channel device and the SSR-6T responds only to 12 channel Motorola binary commands. 

A firmware update including the 8 channel @@Ea message (like the UT+) will be available in the coming months. A 6 channel @@Ba command is also being added so that users of legacy HP timing products that used the old VP Oncore will have an up-grade path. Hope this helps.

Art Sepin

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Bob Stewart
Sent: Tuesday, July 15, 2014 2:37 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Synergy-GPS SSR-6tru problems

I got one of these recently, along with the adapter board.  This is the ublox only version, and I am using u-center version 8.11 software.  I am unable to make it work properly.  The NMEA section happily sends out messages, but I cannot get anything else to work.  e.g. it ignores the commands to turn off antenna power.  It ignores the command to put it in Survey-In mode.  Nothing is displayed when monitoring the SVIN field.  I sent the board back and received one that they have tested there at the site.  Same story.  When I plug my UT+ into the same connector in my GSPDO, it works just fine and responds properly to commands from WinOncore12.  I have used both a serial port adapter and a USB-adapter to drive the TTL lines to the board.

So, there is something wrong at my end, and it's probably something so trivial that no-one would think to mention it.  Has anyone tried this board?  Can you think of any setting that's "inherently obvious to the most casual observer" that a newbie could repeatedly overlook?  For example, is there some first setting that you always do in u-center to shut down the NMEA and turn on the UBX, but the setting does not save on the board and the u-center software always overrides it?

The configuration is this:  The adapter does the 3V to 5V stuff, and plugs into the same connector as my UT+.  The antenna lead is connected to a non-powered port on my GPS Source splitter.  The splitter connects to a puck in the attic via RG-6.  The SNR of the received signals is in the 20-50 range on the u-center display window.  I have tried driving a different puck directly that is in my lab room.  No change except for lower SNR values.

Bob - AE6RV
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