Science Podcasts

Special episode

Tue, 18th Dec 2012

Extra Questions - The Science Behind Broadcasting

A Sennheiser Microphone (c) ChrisEngelsma @ wikipedia

How does a radio broadcast work?  We must have been on your wavelength this week, as we had more questions that we could fit in Naked Scientists Show! Here are the extra bits...

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In this edition of Special

Full Transcript

  • 00:39 - Why does bad weather alter digital signal?

    Digital television signals. We’ve got a nice number of channels to choose from, okay, that's all very nice, but the signal qualities and the strength of those signals are absolutely hopeless. Whenever we get unsettled weather conditions like high winds or wind, rain, and even f...

  • 02:25 - How long does it take for radio to reach me?

    After a day of boredom I worked out that it would theoretically take 0.002 seconds for your show to reach me in Dundee (ignoring the time for your voice to reach the microphone and the time for the sound wave to reach my ears were ignored). However, I was wondering how long it wo...

  • 03:31 - Why don't radio stations interfere?

    How do you stop all the different radio stations interfering with each other? How is local radio local and national radio, national?

  • 05:19 - How do we site radio transmitters?

    There could be 5 or 6 transmitters on a high power frequency in Britain for the network radio 5 Live. So, how do they position those transmitters so that if I'm listening in a certain place, a wave coming from one transmitter isn’t going to mix with the wave coming from another ...



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