By Dale Stacey
Chapter 1 creation (pages 1–8):
Chapter 2 idea Governing Aeronautical Radio platforms (pages 9–104):
Chapter three VHF verbal exchange (pages 105–144):
Chapter four army conversation platforms (pages 145–156):
Chapter five Long?Distance cellular Communications (pages 157–175):
Chapter 6 Aeronautical Telemetry platforms (pages 177–186):
Chapter 7 Terrestrial Backhaul and the Aeronautical Telecommunications community (pages 187–199):
Chapter eight destiny Aeronautical cellular conversation platforms (pages 201–219):
Chapter nine The Economics of Radio (pages 221–227):
Chapter 10 floor Installations and gear (pages 229–257):
Chapter eleven Avionics (pages 259–305):
Chapter 12 Interference, Electromagnetic Compatibility, Spectrum administration and Frequency administration (pages 307–324):
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Additional info for Aeronautical Radio Communication Systems and Networks
Modulator. The refined voice signal (baseband signal) is mixed with the (intermediate) carrier frequency of the radio. This frequency is synthesized typically with a crystal oscillator that provides highly stable frequency sources. The synthesis circuitry is controlled by the frequency selector interface on the radio. This sets the integer frequency of operation required. The combining of the carrier and baseband is usually done in a non-linear device such as a diode or, more commonly, in an active transistor circuit.
It is then amplified and ‘expanded’ – which is the reverse process of compressing (discussed above) – and passed to a loudspeaker or headset as applicable. e. the same information is carried by both. By removing one of the sidebands and by removing the carrier, therefore, no information is lost and the SNR (signal-to-noise ratio) increases for a given transmit power as all the transmitted energy is concentrated into the information signal. 34). The construction of an SSB is fractionally more complicated than that of DSB-AM.
Doppler effects can be significant to the radio systems at the satellite end, as a satellite can be manoeuvring at ‘galactic’ speeds to maintain its orbital position. There are generally three types of satellites: High earth orbit (HEO) or sometimes called geostationary earth orbit satellites (GSS) are the ones that are in stationary (relative to earth movement) orbit at nominally 35 000 km above the equator. That is where the gravitational pull or centripetal force on the object balances or equals the centrifugal force of the object spinning with a period of one day.