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Table of Contents
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All the necessary configuration of your receiver is kept in one configuration file, which you pass as an argument at the program's start-up.
RF Section
Calibrate the frequency
For more information take a look at the ogn-rf install Readme
RF:
{
# [ppm] frequency correction applied to the Rx chip ("big" R820T sticks have 40-80ppm correction factors, measure it with gsm_scan)
FreqCorr = +15;
# for frequency calibration based on GSM signals
GSM:
{
# [MHz] should be selected to cover at least one broadcast channel in the area (find the best GSM frequency with gsm_scan)
CenterFreq = 952.8;
# [0.1dB] Rx input gain for GSM frequency calibration (beware that GSM signals are very strong !)
Gain = 40.0; # [dB] RF input gain (beware that GSM signals are very strong !)
} ;
...
} ;Activate the power supply for preamps
Please visit the related subsection of the manual installation guide before activating the bias-T.
RF:
{
...
# activate the power supply for preamps (only: RTL-SDR.com v3 dongle)
BiasTee = 1;
...
OGN:
{
# [0.1dB] Rx input gain for OGN reception, valid gain settings are : 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
Gain = 22.9;
};
...
};Use multiple rtlsdr devices
If you want to set up multiple receivers on a RaspberryPi, please visit the multiple receiver wiki
In your ogn conf file you can set the receiver/dongle to use (untested, according to mailing list 2014-06-18):
RF:
{
...
Device = 0; # [index] 0 = 1st RTL2832 USB stick, 1 = 2nd USB stick, etc.
...
};Position Section
Setting the correct GPS location
In your receiver's configuration file you need to set the GPS location and elevation of your antenna correctly:
A simple way to find the correct values: Online geoid calc
Alternatively, go to: https://www.freemaptools.com/elevation-finder.htm
Place the marker where your receiver will be.
It will give you data like this:
Latitude - Longitude:
51.496645,-0.176341
Lat: 51° 29' 47.922"
Long: -0° 10' 34.8276"Copy the second line:
51.496645,-0.176341And add 0s at the end to get 7 decimal places:
51.4966450,-0.1763410Set the latitude and longitude and altitude in your configuration file and save it:
Position:
{
# [deg] Antenna coordinates (with 7 decimal places)
Latitude = +51.4966450;
Longitude = -0.1763410;
# [m] Altitude above sea level incl. antenna height
Altitude = 19;
...
};APRS Section
Insert your call sign
Select the callsign for your receiver with a maximum of 9 characters. Please apply the naming conventions.
Note: After selecting your call sign don't forget to add your receiver to the list of receivers.
APRS:
{
# APRS callsign (max. 9 characters). Please apply the naming conventions: http://ognproject.wikidot.com/receiver-naming-convention
Call = London;
...
};Use your own aprs server
If your aprs server listens on localhost at port 14580, you can use this configuration.
Note: You have to forward the packets yourself to the ogn network!
APRS:
{
...
Server = "localhost:14580";
...
};DDB Section
Enforce strict opt-in (since v0.2.4)
Add the following section.
DDB:
{
...
UseAsWhitelist = 1;
...
};Configuration file template
The following template contains some optional arguments for special setups. Use "#" to comment out optional arguments you don't need.
RF:
{
# [ppm] frequency correction applied to the Rx chip ("big" R820T sticks have 40-80ppm correction factors, measure it with gsm_scan)
FreqCorr = {{ + or - ogn_freq_corr }};
# optional: activate the power supply for preamps (only: RTL-SDR.com v3 dongle)
# BiasTee = {{ ogn_bias_tee }};
# optional: rtl-sdr device index
# Device = {{ ogn_device_id }};
# optional: char[12] serial number of the rtl-sdr device to be selected
# DeviceSerial = {{ ogn_device_serial }};
# optional: name of the fifo-pipe, relevant for multiple receivers: http://ognproject.wikidot.com/multiple-receivers-configuration-on-raspi
# PipeName = {{ ogn_rf_fifo_name }};
OGN:
{
# [0.1dB] Rx input gain for OGN reception, valid gain settings are : 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
Gain = {{ ogn_ogn_freq }};
};
# for frequency calibration based on GSM signals
GSM:
{
# [MHz] should be selected to cover at least one broadcast channel in the area (find the best GSM frequency with gsm_scan)
CenterFreq = {{ ogn_gsm_freq }};
# [0.1dB] Rx input gain for GSM frequency calibration (beware that GSM signals are very strong !)
Gain = {{ ogn_gsm_gain }};
};
};
Position:
{
# [deg] Antenna coordinates
Latitude = {{ ogn_pos_lat }};
Longitude = {{ ogn_pos_lon }};
# [m] Altitude above sea level incl. antenna height
Altitude = {{ ogn_pos_alt }};
};
APRS:
{
# APRS callsign (max. 9 characters)
Call = {{ ogn_aprs_callsign }};
# optional: APRS server host:port
# Server = {{ ogn_aprs_server }};
};
DDB:
{
# optional: Enforce strict opt in
# UseAsWhitelist = {{ ogn_ddb_useaswhitelist }};
};
HTTP:
{
# optional: change the http diagnostics/debug port for multiple receivers
# Port=8080;
};