You can keep the LNB but will then have the same limitations in terms of concurrent recordings.For my information: why does the LNB matter?
Me neither but that's what some claim.Just done a bit of background reading (never hear of FBC before) and I can see that with a new design of LNB you can send the full frequency band to the tuner instead of only half, but I don't get how the polarisation issue is resolved into one cable feed.
That explains nothing.
Regardless of splitters, if receiver A wants to access the horizontal set and receiver B wants to access the vertical set, how do you send both down the same wire? If a PVR wants to record programmes from the horizontal set and the vertical set simultaneously, how do you get the signals to it (down one wire)?
Conventional satellite TV systems use the LNB to down-shift the satellite transmission frequency band (microwave) to an intermediate frequency that is compatible with transmission through a coax cable. The microwave frequencies won't go down a cable. Conventionally the LNB is sent a command to select the upper or lower microwave frequency band and the horizontal or vertical polarisation.
Let's suppose we double the bandwidth of the IF, and can thus send the upper and lower microwave bands along the same cable (I don't know whether that is technically feasible, but if it is it will be a stretch). The only way to get the other polarisation down there simultaneously is to use another IF band - so the cable and electronics will have to have four times the bandwidth of a conventional system.
I'm not saying it can't be done, what I'm saying is I have seen no explanation how it is done (and I don't mean what you have to buy to make it work). It's the difference between "how does it work" and "how do you work it".
I did read the link, but it didn't seem obvious (probably because I didn't realise a coax can have that wide a bandwidth). If somebody had said, at the start of this discussion, that all four microwave sub-bands get mapped onto separate IF bands, all would have been clear straight away.
That's what I think too, and why I was sceptical.950-2150 MHz x4 is 4.8 GHz worth of bandwidth. Down a bit of cable? I don't think so. Something else must be going on.
What's the difference between that and what a conventional system does? I didn't read it that way; the way I read it is that the central distribution unit takes in the Unicable feed and recreates a conventional feed for each subscriber. For a communal system like that surely it's easier just to have four cables from the LNB (to cover all bases) and then switch these through to the distribution cables on demand.Apart from the aberrant apostrophe, it becomes pretty clear that you need a 'special' receiver which tells the LNB which frequency it wants, as well as high/low and polarisation selection.
950-2150 MHz x4 is 4.8 GHz worth of bandwidth. Down a bit of cable? I don't think so. Something else must be going on.
Ah, reading the link quoted above it says "Please note that these LNBs only work if the satellite receiver has a Unicable SCR option in it's menu."
Apart from the aberrant apostrophe, it becomes pretty clear that you need a 'special' receiver which tells the LNB which frequency it wants, as well as high/low and polarisation selection.
Multiplexing n of these onto a cable is then a doddle compared to sending the full 1200 MHz.
Be nice to see one on a spectrum analyser.
Anyway, no use with a FoxSat, I'm sure, cos it don't have no Unicable SCR option it it's (sic) menu.