tirsdag den 1. december 2015

My VHF/UHF Antenna is up again

The task of moving my antenna support to the center of my garden is progressing nicely!

The assembly is two steel tubes. The upper tube is 38 mm diameter (1½ inch) and the lower one is 50 mm diameter (2 inch). The upper tube is attached to the lower one using two steel platforms (PLS 50 from UKW-Berichte in Germany). The upper tube is turned with my Yaesu G-600 rotor, which is mounted on the lower platform. A thrust bearing (KS065) is mounted on the upper platform and supports the upper tube.

antenna system picture
How the components are assembled.
Even though the tube assembly is quite rigid, is is still easy to handle. I can "walk down" the assembly when I need to fit another antenna. When the tubes are down, they rest horizontally on the lawn, and the antenna is easy to access. The picture below shows the tubes resting on the lawn. Each tube is 6 m (20 feet) long.

The antenna tubes resting on the lawn.
Both antenna tubes are erected and support an 8-element yagi for 2 meters.
There is always something to explore. How are the surroundings affecting VHF antenna performance? Do trees obstruct the signal? How much noise is heard? And so on.

Regards from OZ1BXM Lars Petersen
Homepage: http://oz1bxm.dk

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