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--- 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 09:16] (aktuell) – 84.56.182.161
@@ Zeile 1: / Zeile 1: @@
 for decision, which antenna to use, find answers to the questions:
-.) which frequency should be used?
+  - which frequency should be used?
-.) omni or directional antenna? radiation pattern: pancake, lobe etc?
+  - omni or directional antenna? radiation pattern: pancake, lobe etc?
-.) mounting and drive (az/el rotor and control) ?
+  - mounting and drive (az/el rotor and control) ?
-.) polarisation of the signals (linear or circular?)
+  - polarisation of the signals (linear or circular?)
-.) required / desired / achievable gain
+  - required / desired / achievable gain
 for amateur radio satellites you would answer these questions e.g.:
-.) 430-440 MHz
-.) directional antenna with 3.) azimuth and elevation control
+  - 430-440 MHz
-.) circular polarisation
+  - directional antenna with 3.) azimuth and elevation control
-.) 12 to 18 dB is required and can be achieved with 1 to 4  20-el X-Yagis
+  - circular polarisation
+  - 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
+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, circular, polarisation, reflector, dish, patch,
+stacked array .
+e.g. http://www.amsat.org/amsat/articles/w6shp/lindy.html