turned up pages and pages of references. The second or third response was for a broadcast quality modulator.
ChannelPlus, a brand I know, lists its modulators as available for export supporting PAL...
Your profile does not mention where you are, so I am not able to tell if this is a good answer for you.
Where are you?
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw