Having a bad performance in the ARRL 160m contest yesterday I decided
to check my TX antenna today. I needed to adjust the un-un for a
better match resulting in lower SWR so I can run full power.
As a little quiz, guess my ground system :)
Antenna: 18 meter top loaded vertical with a three wire hat attached
at 15m and sloping 45 degrees.
Impedance: 12.5 Ohm
Feed: un-un to transform to 50 Ohm
Bandwith: 30 kHz, at SWR 2:1.
Terrain: Rocky on the shore of the Baltic Sea
73 de Björn,
SM0MDG
SE0X
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