The cause may possibly be you have a DVB-T USB with wrong chips.
For 1090 Mhz, the DVB-T USB Stick should have following two chips (you have mentioned only one chip)
RTL2832U + R820T2
Some DVB-T USB Sicks have One chip RTL, other Fitipower, like below.
These work OK for TV, but for 1090 Mhz, these either dont work or work very poor.
RTL2832U+FC0012
RTL2832U+FC0013
To check chipset in your DVB-T, run following test.
Code:
sudo apt-get install rtl-sdr sudo systemctl stop fr24feed dump1090-fa tar1090 rtl_test -t
NOTE: After the test is over, reboot RPi to restore system to normal
I get following output with a proper DVB-T
Code:
rtl_test -t Found 1 device(s): 0: Realtek, [B][COLOR=#ff0000]RTL2832U[/COLOR][/B], SN: 00001090 Using device 0: Generic RTL2832U Detached kernel driver Found Rafael Micro [COLOR=#ff0000][B]R820T[/B] [/COLOR]tuner Supported gain values (29): 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 [R82XX] PLL not locked! Sampling at 2048000 S/s. No E4000 tuner found, aborting. Reattached kernel driver
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