I want to use a Freesat PVR to record a programme when I'm not around and then view the programme on any tv in the house.
Can I feed the PVR scart or HDMI to a modulator to feed into the coax cables to the TVs?
It would transmit HD or SD depending on the programme recorded
Each TV would have a 4 way switch in the loft to select one of two satellite LNBs and the output from the PVR.

I'd need a splitter of some sort on the output of the PVR to feed the multiple 4-way switches

And a co-ax cable running from the PVR up to the loft

Or should I go for DVD players in each room and buy one Freesat DVD recorder

Yes you can do that - it's a surprising limtation of the Freesat boxes, all Sky boxes have modulators and remote control via the coax feed.

The modulator would connect to the scart socket, and would only output SD, even when watching or playing an HD channel on the PVR.

I have recently setup a modulator. Out of the Freesat box with composit to the monulator. Then from that to a TV Link plus. The TV Link plus only allows IR control at one of the outputs, so I used a simple Y splitter.

I now have Freesat in the bedroom and kitchen. I use the magic eye IR recievers at both TV's and Im currently waiting for delivery for a secont Freesat remote control. The TV Link Plus has a IR transmitter which is placed infront of the Freesat box.

Its a shame that this Freesat box does not have this ability built in like the Sky+ box as you have more wires and power sockets in use.

And another nice feature of Sky+ and Sky HD boxes that you don't often see mentioned, is they implement line 23 widescreen switching over the modulated RF signal, so if your remote tv is widescreen and supports that, it will switch widescreen mode correctly (mine JVC does)

I wonder if anyone can report if the freesat boxes do that? It's not a modulator function but a box function, so if the composite video output from the box supportes line 23 switching, then it would work with an external modulator and remote tv.

wrong type of modulator I think
I meant one that modulates the signal so it can be decoded by the freesat box
Is probably a modulator and encoder

Now I am lost. First there are no freesat DVD recorders, you could of course connect a freesat box to a dvd recorder.
Everyone else like me thought you wanted to send the foxsat output over a coax cable as a uhf TV channel which any analogue TV could tune as a TV channel. This requires a uhf modulator. Which takes a CVBS video and analogue audio output modulates it onto a uhf carrier of your choice creating a pseudo UHF TV channel. It only works with SD TV and mono sound. It sounds as if you want to do a similar trick and produce a digital TV channel from the foxsat output, in affect create a single transponder multiplex from the foxsat output and send this as though it was coming from a lnb. I doubt that such a device will ever exist in a form that a domestic consumer could ever afford. It's possible to distribute HD video over a cat5e cable connection using a balun. You would need a analogue component HD source to use this which for the foxsat would mean using a device like the HD fury2 to create the HD component source from the foxsat hdmi out.

You're doing fine
Transponder is the word I was looking for

Freesat DVD recorders would be the answer as the disc could be transferred from one room to another. The trouble with PVRs is how do you transfer a recorded programme from one to the other

What about USB stick?

It might be possible to design a system by which the IF output of the tuner is translated up to the UHF band, however a multiplex for DVB-S is often around 24-36MHz wide if not more. This would wipe out so many UHF channels that you could cause more problems than you solve. Additionally most DVB-T boxes would be confused by the straight QPSK modulation and probably ignore it. The solution would be to make a single service DVB-T modulated output from the decoded transport stream, again this is possible but without significant volumes you would need anothr £100 per unit for such an accessory.

The final solution is network streaming and HomePlug AV powerline connections, this is technology which has great potential.

Bob