project:hgg:open_tasks:satellite_antenna
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for decision, which antenna to use, find answers to the questions:
1.) which frequency should be used?
2.) omni or directional antenna? radiation pattern: pancake, lobe etc?
3.) mounting and drive (az/el rotor and control) ?
4.) polarisation of the signals (linear or circular?)
5.) required / desired / achievable gain
for amateur radio satellites you would answer these questions e.g.:
1.) 430-440 MHz
2.) directional antenna with 3.) azimuth and elevation control
4.) circular polarisation
5.) 12 to 18 dB is required and can be achieved with 1 to 4 20-el X-Yagis
with such antennas you can transmit to the existing hamsats with only 10-50 Watt rf power and you get a good receiver signal
project/hgg/open_tasks/satellite_antenna.1326354202.txt.gz · Zuletzt geändert: 2012-01-12 08:43 von 84.56.182.161