The Humax get’s a 99/100 signal strength/quality from the aerial source (rf in), and the tv also gets a good signal, connected directly from the aerial too, using the same cable. But no or weak signal from the rf out (to the tv, no channels found) on the Humax.
In the 5000T settings, under “System Settings”, “Power Management”, the “Power Saving Mode” option needs to be set to off, otherwise loop through will not work in standby.