[CQ-Contest] SO2R on a tiny lot - ooops!
vr2bg at harts.org.hk
Sun Jan 2 19:46:58 EST 2005
Make that K8KHZ instead. Not enough tea yet this morning...
>>As Dave, K6LL, mentioned, it can be done. Running SO2R here, QRO both rigs,
>>on a 70 X 100 foot lot. The "big" antenna is an 88 foot sloping dipole
>>which is used on 80-10 and fed as a top-loaded vertical against radials for
>>160. The "small" antenna is a fan inverted vee with wires for 40 and 20,
>>yielding 40/20/15. The center height for both antennas is about 40 feet.
>Doing SO2R here with 8m^2 space for antennas - separate feeders on a
>tribander, a SteppIR dipole above that, short roof tower supporting both is
>shunt fed for 80 & inverted vee doublet reasonant somewhere near 9 Mc
>for 40 (that the 20m reflector of tribander clears by just a few cm as it
>rotates). SteppIR at 16m, rest at 13m & tower starts at 9m above
>ground. Radials for tower do extend beyond the 8m^2 space & center
>of the doublet is in the corner of that 8m^2 space with one leg tied to an
>adjacent house, but I doubt there is anyone doing SO2R in a smaller
>The inverted vee doublet might be something K8SIX might want to try.
>I used to force feed it with a tuner in the shack on 40, but changed to
>balanced feeders & put the tuner outside on the balcony immediately
>below it. By tying the feeders together & working that against some
>sort of counterpoise, it could be used on 80.
>As the total length of tower & mast being shunt fed on 80 is only 8m,
>another possibility would be to shunt feed any tower or other vertical
>conductor one has, even if it has to be part way up the structure &
>with only an elevated radial or two.
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