project:hgg:open_tasks:satellite_antenna
Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
| Nächste Überarbeitung | Vorhergehende ÜberarbeitungLetzte ÜberarbeitungBeide Seiten der Revision | ||
| project:hgg:open_tasks:satellite_antenna [2012-01-12 08:34] – angelegt 84.56.182.161 | project:hgg:open_tasks:satellite_antenna [2012-01-12 08:46] – 87.180.39.132 | ||
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| Zeile 1: | Zeile 1: | ||
| for decision, which antenna to use, find answers to the questions: | for decision, which antenna to use, find answers to the questions: | ||
| - | 1.) which frequency should be used? | + | - 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.: | for amateur radio satellites you would answer these questions e.g.: | ||
| - | 1.) 430-440 MHz | + | |
| - | 2.) directional antenna with 3.) azimuth and elevation control | + | - 430-440 MHz |
| - | 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 such antennas you can transmit to the existing hamsats | ||
| with only 10-50 Watt rf power and you get a good receiver signal | with only 10-50 Watt rf power and you get a good receiver signal | ||
project/hgg/open_tasks/satellite_antenna.txt · Zuletzt geändert: 2012-01-12 09:16 von 84.56.182.161