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Fringe Reception General
Dish size info for Nilesat 7W in western Europe & the UK
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<blockquote data-quote="Fisty McB" data-source="post: 877387" data-attributes="member: 389824"><p>In one-way broadcast, there is no way for the sender of the transmission to know how clean a receivers signal is without feedback.</p><p></p><p>The error correction sent as part of the transmission allows a receiver to recover some or all of the original data that may have been lost originally. The higher the FEC rate, the more error correction is sent with the transmission which in return means that the transmission signal is more robust. This can allow for more smaller receiving dishes and/or better protection against interference or temporary interruption/weakening of the signal e.g. rain fade, as the signal can be decoded by the receiver with a smaller signal to noise ratio.</p><p></p><p>For example, the Irish Saorsat transmission on Ka-sat at 9 east uses an FEC of 1/2 mainly because it provides a large amount of elbow room during heavy rain which is worse in the Ka Band compared to Ku used by Sky etc. So that during heavy downpours (a necessary consideration in almost all of the island!) even if the rain drastically hits the signal to noise ratio, a receiver should still be able to make use of the signal. If the FEC was say 3/4 instead, reception would be lost more often in the rain as the downpour would not have to be as heavy or intense to render the signal unusable.</p></blockquote><p></p>
[QUOTE="Fisty McB, post: 877387, member: 389824"] In one-way broadcast, there is no way for the sender of the transmission to know how clean a receivers signal is without feedback. The error correction sent as part of the transmission allows a receiver to recover some or all of the original data that may have been lost originally. The higher the FEC rate, the more error correction is sent with the transmission which in return means that the transmission signal is more robust. This can allow for more smaller receiving dishes and/or better protection against interference or temporary interruption/weakening of the signal e.g. rain fade, as the signal can be decoded by the receiver with a smaller signal to noise ratio. For example, the Irish Saorsat transmission on Ka-sat at 9 east uses an FEC of 1/2 mainly because it provides a large amount of elbow room during heavy rain which is worse in the Ka Band compared to Ku used by Sky etc. So that during heavy downpours (a necessary consideration in almost all of the island!) even if the rain drastically hits the signal to noise ratio, a receiver should still be able to make use of the signal. If the FEC was say 3/4 instead, reception would be lost more often in the rain as the downpour would not have to be as heavy or intense to render the signal unusable. [/QUOTE]
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Fringe Reception General
Dish size info for Nilesat 7W in western Europe & the UK
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