I recently installed graphs1090 and I want to see how adjusting my gain might affect my number of messages and planes tracked. When I try to follow the instructions here for the Debian Package add-on of flight aware (I’m running Raspbian 11 bullseye):
I don’t see RECEIVER_OPTIONS, but instead see a file that says “this is sourced by /usr/share/dump1090-fa/start-dump1090-fa as a shellscript fragment”, followed by options for setting ADAPTIVE_DYNAMIC_RANGE, ADAPTIVE_MIN_GAIN, ADAPTIVE_MAX_GAIN, etc.
Could anyone please provide me with some guidance on the best way to do this?
You are following a several years old guide (pre version 6). There have been some changes since then.
(1) Please issue following command to open config file:
sudo nano /etc/default/dump1090-fa
(2) Slowly scroll down the file, till you see following code:
# Initial receiver gain, in dB. If adaptive gain is enabled (see below) the actual gain
# may change over time
RECEIVER_GAIN=60
# Adjust gain to try to achieve optimal dynamic range / noise floor?
ADAPTIVE_DYNAMIC_RANGE=yes
# Target dynamic range in dB (leave blank to autoselect based on SDR type)
ADAPTIVE_DYNAMIC_RANGE_TARGET=
# Reduce gain when loud message bursts from nearby aircraft are seen?
ADAPTIVE_BURST=no
# Gain range to allow when changing gain, in dB (empty = no limit)
ADAPTIVE_MIN_GAIN=
ADAPTIVE_MAX_GAIN=
(3) To adjust gain to your desired value, replace 60 by your desired value of gain (for example 42) in following line:
RECEIVER_GAIN=60
(4) Also change yes to no in following line:
ADAPTIVE_DYNAMIC_RANGE=yes
(5) Save file, then restart dump1090-fa to implement the changes you have made as above:
