Hello! I’ve still checked and I’m not sure that the RSSI is the raw rf signal level
I can not change mode sdr -rtl for quadrature demodulation.
all actions for signal reception and demodulation make sdr100 binary.
what comes inside the sdr100 secret because there is no source code.
sdr100 does not have any documentation and the sdr100 -help command does not give all the values accepted by the program. example:
root@outernet-vm:~# export LD_LIBRARY_PATH="/usr/local/sdr.d/starsdr-rtlsdr"
root@outernet-vm:~# sdr100 -h
sdr100 V1.0.4, Outernet SDR satellite demodulator.
Compiled for ARM processors with hardware floating point.
Usage: [-f Tune frequency (MHz) (default: 1539.87250 MHz)]
[-u Frequency uncertainty +/- (Hz) (default: +/-4000 Hz)]
[-r Symbol rate (sym/sec) (default: 4200 Hz)]
[-a Antenna pointing mode. Use aPkmn in the console display for aiming.]
[-d Device index (default: 0)]
[-c Disable console input/output (default: enabled)]
[-h this help]
In the script with the presets, additional parameters are assigned which can only be guessed. example:
COMMON="-u 4000 -r 4200 -s 1 -b 0.2 -w"
AMERICAS="-f 1539.8725 $COMMON"
EURAF="-f 1546.25 $COMMON"
APAC="-f 1547.3459 $COMMON"
I’ll attach 2 more screenshots from gqrx with lna turned on and off
as seen in the screenshot with the included lna a very weak signal at at 1546.25mhz is there but it does not match the declared width of 4khz
PS and forgive me for my English
and I do not rule out the possibility that the signal on the territory of the Russian Federation can be silenced.