29-04-2022, 10:42 AM
(28-04-2022, 01:56 PM)John Cornforth Wrote: Unsuppressed ignition radiates mostly over the VHF and UHF ranges, so terrestrial analogue and digital radio and TV broadcasts are affected, along with professional and amateur radio communications. You won't see white spots and hear clicks and buzzes with digital radio and TV, instead you get "freeze frames" and stuttering.
Interesting. Our caravan, which we use for many A7 events has a digital Freeview over UHF connection and we do suffer from dropped frames and audio problems in weak signal areas. But these disturbances are not co-incident with the movement of the (largely unsuppressed) A7's about the site but more to do with people movements and movements of motor vans, cars and caravans, causing reflections and shadows in the line-of-sight signal. That old film was made at the time that TV was transmitted on Band I VHF (BBC only, no ITV until 1955), which was possibly more susceptible to interference from spark gaps?