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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SNG antennas
We now come to the focal point of the uplink – the antenna. The function of the antenna is to take the signal from the HPA and both further amplify the signal and focus the beam towards the satellite. Although there are a wide variety of antennas used in satellite communications, SNG uplink systems always use a parabolic type, similar to what we saw earlier in terrestrial ENG microwave. Downlink reception systems also use parabolic antennas.
We have already looked at the characteristics of parabolic (dish) antennas earlier in considering terrestrial microwave, so what are the differences seen in an SNG dish?
To recap, a parabolic surface produces a parallel beam of energy if the surface is illuminated at its focus, and the parabolic ...
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