[Thumbgps-devel] "Plain Jane" timing GPS is working!

Ron Frazier (NTP) timekeepingntplist at techstarship.com
Tue Apr 3 07:59:13 PDT 2012

Hi Eric,

I had my Sure board working a couple of weeks ago connected SERIAL -> 
Prolific adapter -> USB, with PPS patched to DCD, running NTPD on 
Windows using Dave Hart's new binaries, without running GPSD.  It was 
working fine within + / - 1 ms of GPS time.  It was definitely reacting 
to the pulses.  Maybe you could try with NTPD only.  I was using the 
"20" NMEA driver with the PPS flag 1 active.  I don't know for sure if 
the Linux version of NTPD has all the features necessary to do this.

PS  I haven't seen much traffic on the thumbgps-devel list lately.  Is 
this still "the place to be" for info on this project?



On 4/3/2012 10:34 AM, Eric S. Raymond wrote:
> A few minutes ago I received mail from the test engineers at NaviSys.
> They have tested the "Plain Jane" concept (take a stock SiRf-III GPS
> chip plus PL2303 USB adapter, connect the 1PPS pin on the former to
> DCD input on the latter) with GPSD, and are actually seeing PPS pulse
> messages in the logs.
> The filter in GPSD doesn't like the pulse shape and is rejecting it, but
> that can be fixed.  The essential point is that the hardware mod works
> exactly as expected and is producing events visible on USB.
> I'm expecting my samples from UniTraq today or tomorrow and may soon have
> more good news about our second Plain Jane variant.


(PS - If you email me and don't get a quick response, don't be concerned.
I get about 300 emails per day from alternate energy mailing lists and
such.  I don't always see new messages very quickly.  If you need a
reply and have not heard from me in 1 - 2 weeks, send your message again.)

Ron Frazier
timekeepingdude AT techstarship.com

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