I took my inspiration for the one turn counterpoise idea from HF Antenna For All Locations page 155, Fig 11.9(m).
David G3UNA > On 09 January 2022 at 17:09 CUTTER DAVID via Topband <[email protected]> > wrote: > > > Thanks, Rick. > > My particular circumstances limit me to a small triangle of ground in the > corner of a field and the FCP suits that very well. It would be interesting > to know how the FCP compares to something well known, like a broadcast > station ground. > > I like the idea of the spiral counterpoise: I experimented with a one turn > counterpoise in EZNEC > at 3 m above ground level. It looked workable but too big for my space, so, > I could make that into a spiral and perhaps not be too concerned about > symmetry. However, looking to Guy's idea of stacking the wires vertically so > they shade the ground underneath might be worth a try. Compressing things > always seems to limit bandwidth, so, that's something to be wary of. > > David G3UNA > > > > On 09 January 2022 at 16:22 "Richard (Rick) Karlquist" > > <[email protected]> wrote: > > > > > > > > On 1/9/2022 4:51 AM, CUTTER DAVID via Topband wrote: > > > Hi Rob > > > > > > I see copper prices have doubled in the last year. > > > > > > My intention is to compare and contrast the cost and performance of short > > > verticals over a large field of ground radials v the very modest amount > > > of wire required for the FCP. In Guy's article > > > > > > > This is a false dichotomy between FCP and a broadcast station ground > > screen. The best use of wire is to have a small number of elevated > > tuned radials with proper RF choking. As shown by N6LF, you can do well > > with just 8 radials, about 100 feet long each. On 160 meters, they > > should be 20 feet high for optimum performance. BTW, cheap aluminum > > electric fence wire works perfectly for elevated radials Also consider > > N6BT's single spiral radial configuration as an alternative to FCP. > > > > Rick N6RK > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
