I think I soon will give up.
I use a DTV on a Beo4 to activate the mainroom BV8-32 from the link. This works fine. The TV turns on (green light). I try to change the frequence to 450 as suggested. I tuned in a analogue channel i EyeTV to 450,25 mHz and suddenly I got a signal. Now everything looked almost fine. The quality was not the best.
Then I tried another frequency, but not signal from the main room. The TV still turn on. Now comes the weird thing. I changed the link frequency back to 450 on both the TV and in EyeTV, but now there is no signal again. This is really weird.
The normal antenna signal still works. So it is not the cable from the RF link amplifier. Still wondering if it is the BV8-32.