Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- en:betriebsarten [2021/04/16 21:48] – angelegt mb
+++ en:betriebsarten [2021/05/01 11:17] (aktuell) – mb
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 ==== A3 ====
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-For medium and long wave broadcasting and also for telephony operation in military communications in the early years, **amplitude modulation** is used. The signals can be demodulated by simple receivers, starting from the crystal detector as well as with a complex superhet receiver, without the need for a telegraphy superheterodyne oscillator. The modern designation for this type of modulation is **A3E**.
+For medium and long wave broadcasting and also for telephony operation in military communications in the early years, **[[amplitude modulation]]** is used. The signals can be demodulated by simple receivers, starting from the crystal detector as well as with a complex superhet receiver, without the need for a telegraphy superheterodyne oscillator. The modern designation for this type of modulation is **A3E**.
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-With amplitude modulation, the transmitted energy as well as the bandwidth requirement is hight: a major part of the transmitter energy is "wasted" in the carrier signal, which however does not transfer any information. Due to the identical audio information in both sidebands, the signal covers more than twice the width of the highest transmitted sound frequency. This means a signal with high audio quality requires more bandwidth, a narrowband signal becomes dull and difficult to understand.
+With [[amplitude modulation]], the transmitted energy as well as the bandwidth requirement is hight: a major part of the transmitter energy is "wasted" in the carrier signal, which however does not transfer any information. Due to the identical audio information in both sidebands, the signal covers more than twice the width of the highest transmitted sound frequency. This means a signal with high audio quality requires more bandwidth, a narrowband signal becomes dull and difficult to understand.
 Ampitude-modulated signals are susceptible to propagation disturbances (fading) and noise from static discharges and sparks from generators, motors, etc.