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project:hgg:open_tasks:satellite_antenna

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project:hgg:open_tasks:satellite_antenna [2012-01-12 08:43] 84.56.182.161project: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? 
- +  omni or directional antenna? radiation pattern: pancake, lobe etc? 
-2.) omni or directional antenna? radiation pattern: pancake, lobe etc? +  mounting and drive (az/el rotor and control) ? 
- +  polarisation of the signals (linear or circular?
-3.) mounting and drive (az/el rotor and control) ? +  required / desired / achievable gain
- +
-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 3.) azimuth and elevation control+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, circularpolarisation, reflector, dish, patch, 
 +stacked array . 
 +e.g. http://www.amsat.org/amsat/articles/w6shp/lindy.html
  
-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