How that worked was - the transmitters were programmed to monitor syncs and audio. If both failed, the TX switched to RBS (Re-Broadcast Standby) feed which was an off-air reserve. In the case of Divis it was from a south coast relay of Sandale, which in turn was fed from Black Hill.
Cambret Hill I think (a fairly powerful relay), 16kW back in the analogue days, so easily received at Divis.
RBS was supposed to be inhibited (by a VBI ident) during regional or national opts, to avoid the 'wrong' programme suddenly appearing (though surely something is better than nothing ?), but I witnessed my local Tx jumping to RBS during opts too
Last edited by Markymark on 11 November 2017 5:00pm