Sky splitter

You can split a sky cable yes, but you do need the correct splitter. BUT - if one box is using it, you won't be able to use a second box as it is the same cable ultimately going back to the LNB.

With that in mind, you also wouldn't be able to use the, now, second cable as tuner B on a box.

A google result found this:
Can I split one satellite feed into two feeds?
This is a fairly common question. What should you do if you only have one feed from the dish, and two sockets on a box? Sadly, you can’t split a single feed from an LNB to let it feed two tuners at the same time.

Why? Satellite receivers send voltage and signals to the LNB to get the LNB to change frequency and ‘polarisation’ (some channels are Vertical and some are Horizontal). If you have two receivers both trying to switch a single LNB, one box will win, and one will lose.

You can get an LNB switch box that will let you switch your single feed to either of two receivers – just not to feed both at the same time. These are no substitute for having two dedicated feeds from the LNB though.

The best solution is to run a second cable. You just need an LNB with more than once connection point. 1,2,4,8 - not sure if you get more.
 
Yes you do need the correct splitter, I bought a supposed to be a sky splitter of eBay it doesn't work.
I just need it for my 2 Zgemma boxes and only one box at a time will be used.
I have got a Maplin shop where I live do you think they would have one.
Many thanks
 
unplugging boxes just to use a splitter,best to add new cables for feeds as i have have seen before 2 feeds from boxes blowing lnb.
 
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