Will this one work?
https://www.reichelt.com/gb/en/goob...0_x7puYdkxIOvrplOr-tzA9bVrkaAqnyEALw_wcB&&r=1
How would a multiswitch know which signal to send down each output port? how does it know if a satellite feed is required ( i.e. Connected to a Skybox for example) is required or if normal digital signal from the Terresterial antenna is required?
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How would a multiswitch know which signal to send down each output port?" because it mimics the behaviour of the LNB.
Each wire going to the 'lump' on the end of the 'stick' on the satellite dish is connecting to one LNB. When you had Sky+/Sky+HD installed, they knew you'd need at least two feeds to run a recorder box, and they hoped to sell you multiroom as well, so it made sense to install a quad (4 output) LNB device. That means the lump has 4 individually addressable LNBs. Two are used for the recorder box, and the remaining two are/were for enhancements to your Sky system (IOW flogging more subscription services).
Without getting bogged-down in the technicalities of single LNB mode, for most of us, having a Quad LNB means it's possible to run two Sky+/Sky+HD recorder boxes, or one recorder and two feeds that can watch any available channels independently. What it's not possible to do with satellite is to split one LNB feed and watch two programmes that are on different channel groups as defined by the polarity and frequency.
The difference with a multiswitch (when combined with a Quattro LNB) is that all four signal groups are available together; that's the
multi part of multiswitch. What happens is the switch bit of it sends which ever of the four signal groups is required when there's a satellite tuner sitting at the end of the wire. It's a bit more than that though because a multiswitch normally has more than just four outputs. There are 8-way, 16-way, 24-way and so on; so the mutliswitch is also a distribution amplifier. What that means is if 6 satellite tuners all need the same signal group, they can all have it.
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or if normal digital signal from the Terresterial antenna is required?"
Firstly, a satellite receiver tuner will ignore a signal from a TV aerial, and a TV tuner will ignore a signal from an LNB, much in the same was as both ignore and stray signals that aren't within each tuner's reception band.
Second, multiple signals can be sent down the same piece of wire and still remain distinct. They're all just part of the spectrum of signals we refer to as radio frequency signals. We use this phenomenon to combine the signals from a TV aerial, and a radio aerial, and a satellite LNB signal, then send the whole lot down a single wire to a filter that then splits them out to the individual components again just as if they travelled down three separate wires.
Remember I wrote that the multiswitch mimics the behaviour of an LNB? Well, LNBs are active devices. They're 'driven' from the satellite receiver to make them change state between receiving the four different channel groups. Each of the LNBs in a Quad is driven by the voltage sent by the satellite receiver (13V or 18V) and whether there's a 22 kHz tone present. Tht's how the multiswitch knows which of the four satellite signals to send down the wire. The TV signal is there too, multiplexed in with the satellite signal. Each tuner type 'listens' for its particular range of signal.
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