| Green Broadcasting networks| 1 Green broadcasting networks ITU World Radio Day Geneva, February 13, 2015 Christian Wachter, Product Manager Rohde & Schwarz Broadcast and Media Division

| Green Broadcasting networks| 2 FM radio exists in Europe since 66 years – room for innovation

| Green Broadcasting networks| 3 Innovations since then: Tubes to transistors, analog to digital, size reductions, etc.

| Green Broadcasting networks| 4 Trend for innovation today: Environmental awareness

| Green Broadcasting networks| 5 Meaning for the broadcasting industry

| Green Broadcasting networks| 6 1. Transmitters: electricity to RF means radio program on air and heat in room

| Green Broadcasting networks| 7 2. Amplifiers in transmitter consume most energy

| Green Broadcasting networks| 8 How to improve: Doherty technology

| Green Broadcasting networks| 9 A little bit technology

| Green Broadcasting networks| 10 Average power – low efficiency Peak power – high efficiency DAB+ signal: Large headroom – low efficiency

| Green Broadcasting networks| 11 Exciter RF Pout Amplifier Main PA Peak PA Amplification for main and peak signals is separated Main amplifier amplifies average signals (class A/B) Peak amplifier amplifies peak signals (class C)  lower headroom in main amplifier required  No energy required in peak amplifier as long no peaks are in the signal  100% improvement compared to old amplifiers!

| Green Broadcasting networks| 12 Peak PA Main PA

| Green Broadcasting networks| 13 Is there environmental awareness is broadcasting? Efficient transmitters = Green Broadcasting networks

| Green Broadcasting networks| 14 Thank you All pictures under GNU license or property of Rohde&Schwarz