Please provide some information about the hard- and software used.

Box type: 500s
GUI (enigma1/enigma2): enigma1
Firmware version:

your question
why can't i get r/f out when using universal rf modulator....no problem with any other receiver i have....eg. manhattan or Humax..so its not a faulty Rf modulator...
all i get is black screen...no audio or video....same if i use composite connections...

thanks for any guidance...