pi@raspberrypi:~ $ ls /dev/dvb
adapter0 adapter1
pi@raspberrypi:~ $ dmesg |grep frontend
[ 79.882757] em28xx 1-1.4:1.0: DVB: registering adapter 0 frontend 0 (Silicon Labs Si2168)...
[ 79.905950] em28xx 1-1.4:1.0: DVB: registering adapter 1 frontend 0 (Silicon Labs Si2168)...
[ 80.641466] em28xx 1-1.4:1.0: DVB: adapter 0 frontend 0 frequency 0 out of range (42000000..870000000)
[ 81.566845] em28xx 1-1.4:1.0: DVB: adapter 1 frontend 0 frequency 0 out of range (42000000..870000000)
strange.. at the moment it seems to work with the pi4.
i only changed the network connection (lan cable and switch port).
when i changed the pis, i had no connection with the old cable/port.
I already tested the network connection yesterday with iperf, the result was nearly 100% gbit...
is it possible that something like a "brummspannung" in english "hum voltage?" has an effect on the signal quality?
should i use network cables with or without ground connection?
or a "mantelstromfilter" ?