[time-nuts] M12+ phase jump due to WAAS/EGNOS DGPS corrections?
Ulrich Bangert
df6jb at ulrich-bangert.de
Sun Apr 23 10:58:45 EDT 2006
Brooks,
i live in Germany abt. 500 km north of Franfurt/M and i run a M12+ in
continuous duty in my GPSDO. Normally i do not keep track of the
receiver's pps. However, on April 23 15:00 UTC i have started to record
the phase relationship as measured inside my GPSDO. Will be glad to
assist you and Ernie in pinpointing any anomalies. If Ernie detects one,
give me a notice and i will look whether i can second source it.
Regards
Ulrich
df6jb at ulrich-bangert.de
> -----Ursprüngliche Nachricht-----
> Von: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Brooks Shera
> Gesendet: Samstag, 22. April 2006 23:56
> An: Discussion of precise time and frequency measurement
> Betreff: [time-nuts] M12+ phase jump due to WAAS/EGNOS DGPS
> corrections?
>
>
> I received the note below from Ernie Peres in Germany which
> reports an effect consistent with an occasional phase jump in
> the 1 PPS output from a M12+ rcvr, perhaps related to DGPS
> corrections. The DGPS sats Ernie sees from his location are
> part of the EGNOS system.
>
> The DGPS sats visible to me (sats #35,47 according to my
> Garmin V) are part of the WAAS system and I haven't noticed
> the phase jump effect with an M12+.
>
> I wouldn't really expect to since the M12+ is not
> WAAS/EGNOS "enabled".
>
> However, something more subtle might be occurring. I wonder
> if anyone else has noticed such an affect or has any ideas.
>
> Brooks
>
>
>
> ------------------note from Ernie----------------------------
> .....I am using a Motorola M12+ timing GPS eng board to
> drive the W5OJM controller board and the high prec OCXO. I
> have also bought a Garmin V handheld unit just for playing
> around and noticed that it displays " new " sats.....ie nbr
> 33 and 37. but the signal bar for this sats were gray instead
> of black on the display. Later I learned that this new sats
> are the AOR-E sat nbr 120 and the ARTEMIS sat nbr 124, and
> also noticed that sat 33 is transmitting DGPS signals because the
> GARMIN V / WAAS enabled / receiver displayed " D "
> letters in the signal strength bar. Also the TAC32 program
> displayed DGPS received and station ID "0000" age 0.........
>
> When I see this sats on the GARMIN receiver the same time
> your GPS controlled board indicates a phase jump... I am
> using DG4RBF software to plot EFC and phase error...... Did
> you heard similar situation?
> I do not know if this 2 sats are visible from the US but it
> should be because the position from my home / Frankfurt/M,
> Germany/ AOR-E EL... 28 deg. and
> AZ.... 214 deg. the 37 sat ARTEMIS nbr 124 El...27 deg
> AZ....164 deg.
>
> Also I have built other type of GPS controlled OCXO the so
> called "analog" version where the JUPITER GPS eng board
> 10kHz signal is PLL-ed the OCXO, and
> also noticed on the EFC voltage a small variation....
>
> Did any other person reported similar problem?
> Based on the internet info this WAAS not yet fully
> operational. It is just a testing procedures ???????? or
> what is the future of this kind of OCXO locks?
> Best regards,
>
> Ernie HG5ED
> ------------------------end of
> Ernie---------------------------
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