Interesting idea about - shall we say - unofficial analogue TV broadcasts. The major downside is , in where digital only switchover has happened - pretty much everywhere , except London , kent , Tyneside and N Ireland , nobody would know you was there as nobody will be scanning the band for analogue TV any more. As already pointed out , there is no empty band as a result of digital switchover - the digital signals are just replacing the analogue ones. In fact , once switchover is complete in a few months time , the UHF TV band is actually being made smaller. The top of the band from approximately channel 62 up to channel 69 will no longer be used for TV. It is being re-allocated to so called 4G mobile data use (phone) , and a small segment between channels 35 and 37 - thats where analogue channel 5 used to be in most areas. This shrinking of the TV band is possible because it is possible to fit many more channels onto a single carrier frequency (around 8 with MP2 and more with MP4) in digital than with analogue (only 1). Also , with digital TV , UHF channels number right next to another one can be used from the same site without the two interfeering with each other - with analogue (PAL) TV , adjacent active frequencies had to be at least 3 channels apart to avoid cross modulation and patterning effects.
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