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matching masts as vertical antennas.
Good day all.
Have run into a bit of a problem matching my G5RV's support mast as a vertical on 20 metres. The mast is 7.5 metres high and insulated from ground with 4 radials at ground level but insulated from ground by installation along fence lines. Obviously a typical 1/4 wave vertical would be ~5.1 metres high, but I had hopes of base loading the 7.5 metre mast to act as a sort of "short 5/8 wave" vertical on 20. Feed is 50 Ohm coax buried up to the matching box. After a lot of research both in books and on the web I have found very little information on the design of an antenna like this. Anyone had any experience of such an idea? I have plenty of airspaced inductor stock and TX type capacitors for the network, and as I usually only run about 150 watts here that shouldn't be too critical. Any ideas gratefully received! 73's Cliff Wright ZL1BDA ex G3NIA. |
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