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Green broadcasting networks

ITU World Radio Day Geneva, February 13, 2015

Christian Wachter, Product ManagerRohde & Schwarz Broadcast and Media Division

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FM radio exists in Europe sinceFM radio exists in Europe since66 years – room for innovation66 years – room for innovation

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Innovations since then:Innovations since then:Tubes to transistors, analog to digital, Tubes to transistors, analog to digital, size reductions, etc.size reductions, etc.

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Trend for innovation today: Trend for innovation today: Environmental awarenessEnvironmental awareness

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Meaning for the broadcasting Meaning for the broadcasting industryindustry

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1. Transmitters: electricity to RF means 1. Transmitters: electricity to RF means radio program on air and heat in roomradio program on air and heat in room

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2. Amplifiers in transmitter consume 2. Amplifiers in transmitter consume most energymost energy

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How to improve:How to improve:Doherty technologyDoherty technology

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A little bit technologyA little bit technology

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Average power – low efficiency

Peak power – high efficiency

DAB+ signal: Large headroom – low DAB+ signal: Large headroom – low efficiencyefficiency

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Exc

iter

RF Pout

Amplifier

MainPA

PeakPA

Amplification for main and peak signals is separatedMain amplifier amplifies average signals (class A/B)Peak amplifier amplifies peak signals (class C)lower headroom in main amplifier requiredNo energy required in peak amplifier as long no peaks are in the signal 100% improvement compared to old amplifiers!

13.02.2015 | Green Broadcasting networks| 12Peak PA

Main PA

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Is there environmental awareness is broadcasting?

Efficient transmitters = Efficient transmitters = Green Broadcasting networksGreen Broadcasting networks

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Thank youThank youAll pictures under GNU license or property of Rohde&SchwarzAll pictures under GNU license or property of Rohde&Schwarz