project:hgg:open_tasks:satellite_antenna
Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
Beide Seiten der vorigen RevisionVorhergehende ÜberarbeitungNächste Überarbeitung | Vorhergehende Überarbeitung | ||
project:hgg:open_tasks:satellite_antenna [2012-01-12 08:43] – 84.56.182.161 | project:hgg:open_tasks:satellite_antenna [2012-01-12 09:16] (aktuell) – 84.56.182.161 | ||
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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 | + | - 430-440 MHz |
+ | - directional antenna with 3.) azimuth and elevation control | ||
+ | - circular polarisation | ||
+ | - 12 to 18 dB is required and can be achieved with 1 to 4 20-el X-Yagis | ||
- | 2.) directional antenna | + | with such antennas you can transmit to the existing hamsats |
+ | with only 10-50 Watt rf power and you get a good receiver signal | ||
- | 4.) circular polarisation | + | Antenna construction is a very wide field, |
+ | search the net, especially for ham-radio antennas. | ||
+ | Homemadekeing antennas is a nice and low cost occupation. | ||
+ | There exists also free simulation software for antennas. | ||
+ | Don't ask where exactly, just Google for keywords: | ||
+ | Antenna + yagi, beam, turnstyle, lindenblad, elevation, | ||
+ | azimuth, | ||
+ | stacked array . | ||
+ | e.g. http:// | ||
- | 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.txt · Zuletzt geändert: 2012-01-12 09:16 von 84.56.182.161