If that is true though, how come you do not get leakage either from
terrestrial to sat or the other way around which would screw up the one
most affected?
Brian

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On Sunday, 16 February 2020 14:51:50 UTC, Commander Kinsey wrote:
How does Sky Q get several channels through one cable? When Sky HD came
out, we had to add a second cable to the dish to get two channels. But Q
does not need 6 cables to get 6 channels.

Universal LNBs work by the receiver selecting one quarter of the channels at
any one time. It does this by alternating the voltage between 13V and 18V
which will enable the LNB to switch between Horizontal and vertically
polarised signals. A 22kHz tone then switches the LNB from a low and high
band. Hence a quarter of the channels at any one time. Vertical Low,
vertical high, horizontal low, horizontal high. It is for this reason a
normal traditional splitter can't be used on your satellite dish as the box
may be trying to request a channel on one quarter or the other box be
requesting a channel on the other quarter.

The LNB output at Satellite intermediate frequency (IF) which sits just
above the UHF band used for terrestrial TV and 4G internet signals and coax
cable has a bandwidth for half the satellite signal (i.e. low band or high
band).

The Sky Q system now uses a frequency band which now includes all the band
previously reserved for traditional terrestrial TV signals. It is what we
call a "wideband LNB" which ranges from 230Mhz just above DAB radio right
the way through the terrestrial TV signal band and up to 2359Mhz just
beneath the 2.4Ghz band typically used for WIFI. Because it is "nicking"
space that it did not used to have it has a far greater bandwidth for all of
its services so there is no longer the need for a high and low band.

The Sky Q LNB itself has two outputs which are not the same. One is a
horizontal output and the other a vertical output.

Because the Sky Q system uses terrestrial space, it can't be diplexed with
terrestrial tv on the same cable, it must have its own cables.

summarised from
https://www.smartaerials.co.uk/blog/...-universal-lnb

Owain