Upgrading an Existing OGN Ground Station to Rebroadcast Glider Locations on 869.5MHz.
December 2019.
11
Provide Station
Height AMS
L (change default value to the value of your station). Return
Provide
Geoid
Return
Note the PilotAware Configuration program will calculate the GEOID and suggest what it
is. Use this unless you have a more accurate GEOID figure
The software will then install and calibrate the RTLSDR FLARM radio receiver.
This will take about 90 seconds and it will step through 0dB to +50dB. Stages
If all is well a banner will then be shown with your configuration as shown below.
Following this and after up to 10 minutes to connect to the server it will show Starting
Services. The OGN-R station is now up and running.
pi@ognpaw
:
~/rtlsdr-ogn
Possible Problems
a)
If the SW cannot see the FLARM antenna through the RTL-SDR dongle the software
program proceeds through the calibration very quickly, This, means that there is no
physical connection from the RTLSDR dongle to the FLARM antenna. Suspect the co-axial
cable, pigtail or RTLSDR connection. Make sure all connections are secure and that the
inner pins of the Co-axial cable connectors are mating properly. If you have an SWR
meter available the impedance should be 40-60 ohms and the VSWR between 1 and 2
b)
The calibration routine searches for GSM signals for the antenna and RTLSDR calibration.
Therefore, you may have difficulty in capturing data in low GSM signal strength areas. So
long as some data (Say 6-10 sites) is collected this is OK. This part of the setup is only
used to calculate the frequency offset to be used for the particular antenna.
c)
If after a successful calibration the program states that
it cannot “start service”, this may
be that it cannot get through your broadband router to the internet and hence to the
OGN servers. If this is the case suspect your router or internet connection.
When connected to the OGN servers via the internet, it can take up to 10 minutes for the
station to appear on the OGN map
Testing to see if Your Station is Working
Once your station has registered with the OGN servers it will be displayed on the OGN map.