Mix Directv RF with Dishnetwork CATV ?

[nilosb]

I just bought a new house and it came with one Directv dish installed in the roof. I have called directv and got the 4 receivers pack, to be installed on each room.They said they will replace the existing dish anyway.
I also have one dish network and receiver, which I pay to receive only one international channel, so it's always tunned in one same channel.

Would be possible to have the a/v signal fom the dish network receiver(to be installed where the directv RF cable would splitt to each room) going to an rf modulator, modulating into any free CATV channel and combining together with the signal from the directv dish in the cable that will be splitting and runing to each room? Then it would need a splitter at the TV location to feed the receiver with the directv dish signal and the tv RF in with the CATV channel modulated with the dish network channel.

I'm not sure what is the frequency that the directv LNB converts to and the fact that the directv receiver feeds DC power over the RF cable to power the LNB could be messeup by using the combiners and splitter I told before.

Any help here? Is there a way to upload a drawing to the threat of what I'm saying to bether explain?

Nilo

[SimpleSimon]

The term you're looking for is diplexer.

Only single satellite systems can have splitters on their feed cable - and then only certain types.

You are correct in assuming there are issues having to do with DC power and frequency bands. You should discuss this with your installer.

[nilosb]

Thanks!
Got all fixed. I bought the R-E1200 modulatro from smarthome and 4 diplexers.
The installer used the existing directv dish I had and because that he installed my dish network dish for free, leaving the RF cable available at the garage. He also installed his multiswitch, which feeds all receivers on each roon with the directv rf signal. This multiswitxh has already on imput for RF/CATV signal.
I then installed my dish network receiver in the garage, always tunned to the channel I pay for, connected the AV to the modulator, modulating on channel 65 (it's a programmed modulator, but 65 worked fine). Then connected the modulator output to the multiswitch CATV input. At each tv, added the diplexers so separate the directv from the CATV(65). It worked great, very nice image quality!