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DISH SETUP: Single sat, Multi-Sat & Motorised
Dish size
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<blockquote data-quote="Fisty McB" data-source="post: 1128114" data-attributes="member: 389824"><p>Within the UK at least, for terrestrial transmitting stations where certain programming or backups (e.g. BBC Satback on 27.5W) are fed via satellite, they tend to use quite large fixed prime-focus satellite dishes that would appear to be at least 3 metres in diameter, but in some cases I have seen some smaller (still prime-focus) dishes used for national DAB feeds, probably in the 1.8 metre range which often have a cone shaped shroud covering not just the LNB but also the parabolic dish surface.</p><p></p><p>When the Bilsdale mast was damaged beyond repair last year, some of its relay sites as well as a few temporary sites that sprung up either were unable to use another terrestrial UHF source to relay or couldn't have done for technical reasons (e.g. wrong local region), so those affected had to be provided with a satellite feeds - the BBC Satback for Multiplexes PSB1&3 and a temporary "Digital 3&4" PSB2 multiplex transmitted at 28E. From what I've seen on MB21's transmission gallery, such sites needing these feeds for the three PSB multiplexes used domestic offset satellite dishes & LNBs, (two at each site) in the range of 1 to 1.2 metres in diameter.</p><p></p><p>As a rule, the rain fade margin for satellite feeds to TX sites needs to be far greater than what is deemed acceptable for domestic, household satellite reception so that even the heaviest of expected rain showers that occur each year still doesn't interrupt reception of the satellite feed.</p><p></p><p>In terms of broadcasters themselves, I remember being an eager teen back in the 90's once being invited to Ulster Television's (UTV) studios at Havelock House in Belfast and noticed the huge satellite dish on the roof that was prominent from the car park & near the front entrance of the building which at the time had the station logo on it - it had to be at least 5 metres in diameter and looked like it was motorised. Since UTV moved out of Havelock House to the City Quays 2 building in the city, the big dish (minus station logo) was left behind, and can be seen in the second photo down in the link below. There was nothing comparable at BBC Northern Ireland's Broadcasting House in the city centre, at least at ground level but I'm sure they'd have had something on their roof and would still do.</p><p></p><p>[URL unfurl="true"]https://www.bbc.co.uk/news/uk-northern-ireland-54987691[/URL]</p><p></p><p>In the Republic of Ireland, all the main TV & radio feeds for national stations (Saorview DTT, RTÉ & Today FM for radio & possibly Newstalk as well) are sent to the main transmitter sites via either landline or microwave feeds, the only network feeds done via satellite are for a few regional or quasi-national stations that use the same Intelsat 901 satellite as that used for the BBC SatBack service at 27.5W - additionally, Northern Ireland's Q Radio also uses this satellite to feed its transmitters for its non-Belfast advertising regions. Prior to DSO in 2012, in the last few years of analogue TV operation, feeds from 28E were used for backups at some sites which at times proved troublesome, as reception would sometimes be lost and various messages from the Sky digiboxes being used would pop up!</p></blockquote><p></p>
[QUOTE="Fisty McB, post: 1128114, member: 389824"] Within the UK at least, for terrestrial transmitting stations where certain programming or backups (e.g. BBC Satback on 27.5W) are fed via satellite, they tend to use quite large fixed prime-focus satellite dishes that would appear to be at least 3 metres in diameter, but in some cases I have seen some smaller (still prime-focus) dishes used for national DAB feeds, probably in the 1.8 metre range which often have a cone shaped shroud covering not just the LNB but also the parabolic dish surface. When the Bilsdale mast was damaged beyond repair last year, some of its relay sites as well as a few temporary sites that sprung up either were unable to use another terrestrial UHF source to relay or couldn't have done for technical reasons (e.g. wrong local region), so those affected had to be provided with a satellite feeds - the BBC Satback for Multiplexes PSB1&3 and a temporary "Digital 3&4" PSB2 multiplex transmitted at 28E. From what I've seen on MB21's transmission gallery, such sites needing these feeds for the three PSB multiplexes used domestic offset satellite dishes & LNBs, (two at each site) in the range of 1 to 1.2 metres in diameter. As a rule, the rain fade margin for satellite feeds to TX sites needs to be far greater than what is deemed acceptable for domestic, household satellite reception so that even the heaviest of expected rain showers that occur each year still doesn't interrupt reception of the satellite feed. In terms of broadcasters themselves, I remember being an eager teen back in the 90's once being invited to Ulster Television's (UTV) studios at Havelock House in Belfast and noticed the huge satellite dish on the roof that was prominent from the car park & near the front entrance of the building which at the time had the station logo on it - it had to be at least 5 metres in diameter and looked like it was motorised. Since UTV moved out of Havelock House to the City Quays 2 building in the city, the big dish (minus station logo) was left behind, and can be seen in the second photo down in the link below. There was nothing comparable at BBC Northern Ireland's Broadcasting House in the city centre, at least at ground level but I'm sure they'd have had something on their roof and would still do. [URL unfurl="true"]https://www.bbc.co.uk/news/uk-northern-ireland-54987691[/URL] In the Republic of Ireland, all the main TV & radio feeds for national stations (Saorview DTT, RTÉ & Today FM for radio & possibly Newstalk as well) are sent to the main transmitter sites via either landline or microwave feeds, the only network feeds done via satellite are for a few regional or quasi-national stations that use the same Intelsat 901 satellite as that used for the BBC SatBack service at 27.5W - additionally, Northern Ireland's Q Radio also uses this satellite to feed its transmitters for its non-Belfast advertising regions. Prior to DSO in 2012, in the last few years of analogue TV operation, feeds from 28E were used for backups at some sites which at times proved troublesome, as reception would sometimes be lost and various messages from the Sky digiboxes being used would pop up! [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
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