July 2013
Beginner
224 pages
5h 46m
English
Content preview from Introduction to SNG and ENG MicrowaveBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Transmission and reception chains
In an analogue microwave link, the baseband video and audio signal from the camera and the microphone is connected to the input of the modulator. This takes the basic message signal and modulates it, using the FM process, turning it into an RF signal called the intermediate frequency (IF) signal typically based on a 70 MHz carrier. The output of the modulator is fed to an upconverter, which shifts the frequency of the IF signal from the relatively low 70 MHz frequency up to the super high frequency (SHF) of the microwave transmitter – typically in the 2.5, 5 or 7GHz frequency bands. This is then amplified, fed to the antenna and transmitted as a microwave signal. The power of the transmit amplifier is typically ...
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