Hi Terry,
Am 06.08.2017 13:07, schrieb Terry G0EZY:
Hi Stefan
Did you get gpsd and ntp working by following Paul's info (email
21/07)?
No, but his advice was an important step forward. I took additional
advice from the web and after some time i got it working.
I have a UBlox NEO 7M connected to the RasPi by USB and I
can run xgps or cgps and see that the NMEA is being read. But ntp is
not being updated by the gps...
I'm using a NEO 6M and i used the serial interface on the GPIO board.
You just need two short wires to realise the communication.
Like that:
http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/20170807_152938.jpg
I have been at the point where you are hanging now. The main steps i
did to get it running were:
sudo
systemctl stop gpsd.socket
sudo
systemctl disable gpsd.socket
then start the service manually with:
sudo gpsd –n
-F
/var/run/gpsd.sock /dev/ttyAMA0
Replace AMA0
by your individual ID of the USB serial interface if you want to use
that.
I added:
server 127.127.28.0 prefer
fudge
127.127.28.0 time1 0.055 refid GPS
to
/etc/ntp.conf
Afterwards
sudo
service ntp restart is required.
I checked if it works by running
ntpq
–p and got this
result:
pi3@Pi8:~/script $ ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*SHM(0) .GPS. 0 l 47 64 377 0.000 297.483 137.453
v20819.php-frie .STEP. 16 u - 1024 0 0.000 0.000 0.000
ole.klickmich.o .STEP. 16 u - 1024 0 0.000 0.000 0.000
ntp.fanlin.de .STEP. 16 u - 1024 0 0.000 0.000 0.000
+ptbtime1.ptb.de .PTB. 1 u 134 64 336 15.411 356.851 150.343
For my portable recorder i'm running a script that checks the
difference between system time and GPS time. It is running a while loop
until the time difference becomes less than 2 seconds. This tells that
the clock has been set by GPS. Then the script continues to start all
the vt processes.
Soon i'm going to run an EbNaut transmission on 3675 Hz to see if i can
decode it only by using vlfrx tools and EbNaut.
Once I have that problem solved and built the PPS shaper,
I can make progress with the Octo soundcard project.
Paul made it seem so easy...!
Yes, if you know how it works then it appears to be easy. Like driving
a car, or solving mathematic equations...
I followed your recommendation and bought some of the
DC/DC converters from Amazon. Do they require any additional filtering?
No additional filtering is required (i can't know about your individual
situation however). Anyway i put 1000 uF onto the output, just to be
prepared for any eventualities.
After years i did not discover QRM on LF/MF/VLF. I'm using this
converter on the tree as well.
73, Stefan
73 Terry
