When the programme fell off air it just cut to black rather than the usual pixellating or freezing that is common with digital. Last night there was frequent glitching in the bottom third of the picture.
When an analogue link transmitter goes down you'll get white noise / snow on both the video and audio (which normally results in whatever the synchroniser is set up to output when it loses incoming sync (normally the last complete video frame received and silence) being broadcast). With digital it'll be whatever the receiver head is setup to output on loss of signal, normally a black or blue screen (the synchroniser won't get involved (if there is one), as the receive head is always generating a valid video signal).
If an analogue or digital receiver goes down, you'll get a blank signal - black and silence. That said, it's pretty unusual for the receive side to go down, they're normally a lot more robustly mounted, and with more reliable mains supplies than transmitters.
Also, digilinks are a lot more robust than their analogue equivalents. If you can see picture disturbances on digital, there's a good chance an analogue link in the same situation would already be unusable. I remember experimenting with some of the first digilinks available to see how far we could go compared to the analogue kit we normally used. The ability to go indoors was (at the time) revolutionary too!
