[gpsd-users] strange - currently only few satellites

[hans mayer]

dear all,

i run 2 NTP server on 2 identical systems. both are
banana pi's M1 with GPS modules from M0UPU with a small GPS
mouse ( GPS antenna ).
this configuration i run on 2 different locations - let
say A ( a rurally area ) and B ( in an urban area ) - since
about last June successfully. typically there are between 6 and
7 satellites visible over 24 hour's in average which gives a
stable time information for NTP.
and sometimes even much more are available.

this days i recognized a dramatically change at march 24th
around lunch time on location A. currently less than 2 satellites
are visible in average for 24 hours and over long periods even
no one. in summary 11 hours at 03/25
i will attach 2 png's to see the difference between date
before and after 03/24 of usable satellites.
( this will be hopefully accepted by the mailing list )

so i thought, ok, some electronics is broken and i took the
complete hardware from locate A to B. i thought i will change the
parts and i will see which one is broken.
but this system worked perfectly on location B.
as well as system B and as well as before 03/24 on location A.
i upgraded to gpsd version 3.17 both systems.
but of course no change - both systems are working well.

to be sure i changed the GPS modules between the banana pi's.
both working well at location B.
and i brought back the pi of location A with the module of B
to the location A. on location A there is the other GPS module
now.

and guess: the same bad situation as before.
what i can say it's not the hardware.

have you ever seen such a strange behaviour ?
i can only guess there is a source of interference.
but how to find it ?

any feedback or any ideas are welcome.


kind regards
hans

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plot_160325.png
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