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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
DTT (TDT) Portugal(Madeira Island) Reception of TV Canarias
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<blockquote data-quote="Adam792" data-source="post: 754950" data-attributes="member: 330868"><p>By the looks of things, you're periodically receiving Spanish TDT signals from the Canary Islands, 400-ish km to the South of Madeira. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /></p><p></p><p>At this distance, normal reception is not possible due to the curvature of the Earth, but becomes possible due to troposperic ducting (atmospheric conditions); when these conditions are 'just right' you start to receive signals from much further afield than usual. This is most likely the reason you've been sporadically receiving these Spanish channels. As the conditions change dependent on pressure this is why you can't receive the channels all the time - there's nothing wrong with your aerial.</p><p></p><p>You can see the same sort of effect here in the UK where (especially in Eastern/South-Eastern areas), on good days you can hear lots of French, Belgian, Dutch and even German radio stations, and even in very good conditions pick up their DTT signals.</p><p></p><p>Nonetheless, reception of DTT over 400km is pretty good going! Your high location obviously helps.</p><p></p><p>The only advice I can give is to enjoy it as and when it happens! :-righton</p></blockquote><p></p>
[QUOTE="Adam792, post: 754950, member: 330868"] By the looks of things, you're periodically receiving Spanish TDT signals from the Canary Islands, 400-ish km to the South of Madeira. :eek: At this distance, normal reception is not possible due to the curvature of the Earth, but becomes possible due to troposperic ducting (atmospheric conditions); when these conditions are 'just right' you start to receive signals from much further afield than usual. This is most likely the reason you've been sporadically receiving these Spanish channels. As the conditions change dependent on pressure this is why you can't receive the channels all the time - there's nothing wrong with your aerial. You can see the same sort of effect here in the UK where (especially in Eastern/South-Eastern areas), on good days you can hear lots of French, Belgian, Dutch and even German radio stations, and even in very good conditions pick up their DTT signals. Nonetheless, reception of DTT over 400km is pretty good going! Your high location obviously helps. The only advice I can give is to enjoy it as and when it happens! :-righton [/QUOTE]
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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
DTT (TDT) Portugal(Madeira Island) Reception of TV Canarias
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