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    Worst recording on the planet: Sky HD 24.

    This is a discussion on Worst recording on the planet: Sky HD 24. within the Sky+ HD Supertelly forums, part of the Other Sky help and support category; I was the OP , but I never mentioned atmospherics. That was The Voyager....

    1. #11
      Paul Iddon's Avatar
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      Re: Worst recording on the planet: Sky HD 24.

      I was the OP, but I never mentioned atmospherics.

      That was The Voyager.


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    3. #12
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      Re: Worst recording on the planet: Sky HD 24.

      Quote Originally Posted by Paul Iddon View Post
      I was the OP, but I never mentioned atmospherics.

      That was The Voyager.
      Paul, stop splitting hairs!

    4. #13
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      Re: Worst recording on the planet: Sky HD 24.

      Quote Originally Posted by Proppinupthebar View Post
      Paul, stop splitting hairs!
      Well, i was the one that mentioned atmospheric interference, and I stand by what I said, if you google for that along with satellite TV then you will find many references to it including the following:

      Satellite tv does have its drawbacks, however. The reception is highly subject to atmospheric interference like sunspot activity and bad weather. Heavy rain can knock out service for hours at a time, which can be very frustrating if you are watching something at the time.

      EOT
      Bob

    5. #14
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      Re: Worst recording on the planet: Sky HD 24.

      Quote Originally Posted by TheVoyager View Post
      Well, i was the one that mentioned atmospheric interference, and I stand by what I said, if you google for that along with satellite TV then you will find many references to it including the following:

      Satellite tv does have its drawbacks, however. The reception is highly subject to atmospheric interference like sunspot activity and bad weather. Heavy rain can knock out service for hours at a time, which can be very frustrating if you are watching something at the time.

      EOT
      Atmospheric interference is caused by the ...... atmosphere! Rain is weather, rain fade isn't in my opinion atmospheric interference, sun spot activity is not even on earth (but does affect the atmosphere so I can give you that).
      Certain conditions can cause the layers of the atmosphere to react differently to radio waves. Waves which would have passed through the atmosphere are reflected back down to earth (radio hams use this to talk round the world), tropospheric ducting means that TV signals are carried in 'ducts' of different temperature air meaning signals are carried far further than normal (French TV is often seen in the UK when it happens), it happens a lot in foggy weather in summer. Sunspot activity changes the levels of ionisation in the various layers of the atmosphere which again allows signals to bounce back down to earth.
      Satellite TV uses microwave frequencies which aren't affected by atmospheric changes.
      Satellite TV is affected by rain fades, and twice a year by sun outs (look it up) but not by atmospheric interference.

    6. #15
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      Re: Worst recording on the planet: Sky HD 24.

      Quote Originally Posted by Proppinupthebar View Post
      Certain conditions can cause the layers of the atmosphere to react differently to radio waves.
      Err, no. If you are determined to be pedantic, then the layers of the atmosphere don't react to radio waves - the radio waves react to the layers.

      And you're saying that rain isn't part of the atmosphere ? Are clouds part of the atmosphere ?

    7. #16
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      Re: Worst recording on the planet: Sky HD 24.

      Quote Originally Posted by Old_nick View Post
      Err, no. If you are determined to be pedantic, then the layers of the atmosphere don't react to radio waves - the radio waves react to the layers.

      And you're saying that rain isn't part of the atmosphere ? Are clouds part of the atmosphere ?
      The thing is I can admit when I'm wrong. You are right in this case, the ionisation of particles in the layers causes the radio waves to react differently.

      Rain isn't a part of the atmosphere any more than you or I am.

    8. #17
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      Re: Worst recording on the planet: Sky HD 24.

      I'm glad to hear that my 27 years as a radio amateur haven't been wasted

      Since we are talking about the propagation of radio waves, those engaged in the transmission of them (on both professional and amateur levels) would always include rain as an atmospheric feature, because it plays a large part in the propagation of some radio frequencies. The Ku band is otherwise known as the "rain band" because the wavelength is about the same as the size of an average rain drop, and it's the resonant effect of billions of rain drops causes rain fade. Rain is part of the atmosphere when it's up there, and not on the ground.

    9. #18
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      Re: Worst recording on the planet: Sky HD 24.

      Quote Originally Posted by Old_nick View Post
      I'm glad to hear that my 27 years as a radio amateur haven't been wasted

      Since we are talking about the propagation of radio waves, those engaged in the transmission of them (on both professional and amateur levels) would always include rain as an atmospheric feature, because it plays a large part in the propagation of some radio frequencies. The Ku band is otherwise known as the "rain band" because the wavelength is about the same as the size of an average rain drop, and it's the resonant effect of billions of rain drops causes rain fade. Rain is part of the atmosphere when it's up there, and not on the ground.
      Resonant effect or simply absorbtion of signal? Theres no doubt that rain and snow have a significant effect on signal fade, but I'm not convinced that I would call them atmospheric conditions.

      No disagreement regarding uplink site locations then?

    10. #19
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      Re: Worst recording on the planet: Sky HD 24.

      Quote Originally Posted by Proppinupthebar View Post
      Resonant effect or simply absorbtion of signal?
      That would depend on the exact size of the raindrop, and the frequency of the signal. If the raindrop is exactly resonant, it will absorb the signal and convert it into heat energy. If the raindrop is slightly off resonance, it will scatter the signal by re-radiating it. The net effect is exactly the same.

      Quote Originally Posted by Proppinupthebar View Post
      No disagreement regarding uplink site locations then?
      There are many uplink stations. Take a look at this list (under arqiva) - which uplink is at the top of the list ?

    11. #20
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      Re: Worst recording on the planet: Sky HD 24.

      which uplink is at the top of the list ?
      No wish to become embroiled in your little disagreement, but the French version of this probably has Paris at the top and London at the bottom.

      TomD


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