02 May 2008

EME progress

The az/el Spid RAS rotator with all its improvements done by Sven, SM5LE is now installed. A simple feed supporting boom for the lightweight 1.8 m dish is also installed.

I have tried different support solutions for the lightweight septum feed constructed by Sven, SM5LE, but for the moment I didn´t find any good solution.
So I will again try to use this double helix feed, which also is constructed by Sven, SM5LE.

As can be seen it is not easy to build this feed. It is also difficult to tune the design for low swr and keep high attenuation between the TX and RX ports. I will start with sun noise measurements and try to see if there is not so big difference of the the right and left hand circular polarization antenna diagrams.