Adding to that having had a coffee break I have noticed on thing. The
transmitters section has two comments - the one about pixelation and the
one about screens going blank.
From what I know of them, the pixelation comment seems to apply
entirely to main stations and relays that are in effect secondary main
stations which means they will be fed by fibre or microwave, whereas
those that talk of the screen going blank is an off-air repeater.
In my old patch, Emley is a main as is Olivers Mount (Scarborough,) and
'secondary mains' are Chesterfield, and Idle Hill (Bradford overlooking
Shipley.) Wharfedale (Otley), Cop Hill (Slaithwaite) are both off-air
relays. Idle is fibre fed as main and a microwave link as the back-up
due to planning restrictions.
I wonder .........