Wayne, there was a superb 2015 QEX article by KD2BD on his WWVB disciplined
frequency standard. Full article is online here:
http://www.arrl.org/files/file/QEX_Next_Issue/2015/Nov-Dec_2015/Magliacane.pdf
As a frequency standard I have no major disagreement with the PTTI article.
But the 100
After upgrading the firmware in my CW25, I took a look at the new firmware .bin
file and found what looks like some undocumented / new messages and parameters.
I sent it requests for the unknown parameters and got back these strings:
$PRTHR,PPSO,0,0,10*51
$PRTHR,MCNO,30*40
$PRTHR,IDNO,00*40
PPP works on observations - i.e. pseudorange and accumulated doppler range
from the antenna to the satellites - it does not know or care what
position the reciever thinks it is at, so that makes sense.
Ole
On Sun, Apr 7, 2019 at 8:02 PM John Ackermann N8UR wrote:
> I got the NRCan results
jimlux,
thanks for the info cross correlation. That's sort of how i imagined it
should work, but I wasn't sure. I guess it really helps that we live in
the age of fast computation.
Wayne
On Sun, Apr 7, 2019 at 10:00 AM jimlux wrote:
> On 4/7/19 4:30 AM, Wayne Holder wrote:
> >> Hi Wayne,
>
The Navsync CW25 crapped its pants when rollover occurred. It (and a lot of
other Navsync devices) have a known firmware bug where they stop tracking sats
if the week number is 0. Sure enough, at zero hour, all the sats disappeared.
Conner Winfield has firmware updates for the problem
> Hi Wayne,
> Great to see you found my presentation!
> The paper is available here:
> https://www.kevincroissant.com/WWVB/WWVB_PTTI_2018_paper.pdf
Kevin, thanks for the link to the paper. I'd like to know more about how
correlation works and how you were able to use to to sync with the WWVB
I was running my newly-acquired Z12 (with 1999 firmware) overnight,
capturing RINEX data via Lady Heather, using Cesium reference.
This morning Lady Heather showed the receiver still tracking satellites
and giving time, but the lat/long/elevation were frozen -- lat and long
were correct, but
tsho...@gmail.com said:
> As a frequency standard I have no major disagreement with the PTTI article.
> But the 100 microsecond number they give for absolute time transfer seems to
> be based entirely on propagation characteristics and ignores the difficulty
> I've always had in resolving the
> We have agreed that I will do a board and make Gerber file available. Any
comments or recommendations please off list.
Perhaps put the DAC and the OCVCXO on a daughter board using .1" headers as
an interconnect (like an Arduino shield) so that different DAC/Osc designs
can be swapped in and
I checked today the GPS12XL I have, and that came up with a date in
August 99, before dying a few minutes later. Firmware 4.57.
The only thought I had was that the GPS 12 (still working, still showing
"19" as the year) was bought new around 2002 with a differential
receiver. Perhaps there was
I have the following GPS Devices:
HP 55300A GPSDO (with a motorola GPS) - no problems with WNRO.
2 - Trimble Resolution T GPS receivers - no problem with WNRO.
Trimble UCCM GPSDO - no problem with WNRO.
So far a non event here in the U.S.
Gary
On 4/7/19 4:30 AM, Wayne Holder wrote:
Hi Wayne,
Great to see you found my presentation!
The paper is available here:
https://www.kevincroissant.com/WWVB/WWVB_PTTI_2018_paper.pdf
Kevin, thanks for the link to the paper. I'd like to know more about how
correlation works and how you were able
Hal, thanks for the suggestion. However, I also tried that sequence. I
should have mentioned that I tried unplugging the antenna as well.
Joe Gray
W5JG
On Sat, Apr 6, 2019 at 9:39 PM Hal Murray wrote:
>
> jg...@zianet.com said:
> > All this talk of GPS week rollover reminds me of a problem
Two Oncores still running, both sailed straight through.
Next question is what happens if they are restarted ?
COPYRIGHT 1991-2003 MOTOROLA INC.
SFTW P/N # 61-G10268A
SOFTWARE VER # 2
SOFTWARE REV # 1
SOFTWARE DATE APR 16 2003
Hi,
Yesterday, pre-rollover, I reported that my Emap nav device had rolled over
once:
"I checked my Garmin Emap, 1999 vintage IIRC. That is telling me that it is
20/05/2014. "
I left it out over the rollover this morning and surprise surprise the date has
switched back to the correct date.
That's an interesting document, thanks for the link.
For what it's worth, despite the changes to WWWB there is at least one
Spectracom 8164 still running as originally intended, well, sort of:-)
I have an 8164 in the UK that will run quite happily from MSF, although I must
admit to keeping it
I switched my GPS12 on, and it comes up with 07 Apr 19, time correct, too.
Firmware is 4.58, 1996-2000.
John
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Hi
After the passing of Clive Green HCD Research has taken over the Quartzlock
business mid 2016
Regards
Bernd DK1AG
> Not personally, but in the UK a company called Quarztlock made both MSF
(similar to WWVB) and 198kHz (a frequency-standard broadcast station) that
were popular frequency
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