Jim - I have done this - and it does work. You can get a couple of db of gain - and perhaps even more importantly - some good F/B. The distance should be something in the order of 45-65 feet or so (not very critical) and you will have to do some work to determine where the best F/B ratio is achieved. I used a broad band signal source and a battery powered receiver that I could tune around. Get off on the backside and tune the receiver for minimum signal. Adjust the length of the radiator to move that to where you want it. A relay in series with the element can be used to remove the element and go back to omni direction. You can also put a coil in there instead and perhaps make it a reflector to go to the opposite direction. You should see a very sharp null off the back for 10 or 20 kHz. While this might not be the place where you get peak gain - it's probably pretty close - and much easier to find than a gain peak.
You will need an effective ground system for this to work. I found I needed at least 40 radials (mostly 1/4 wave in my case) to make it work well. However, in the end, I went with a 1/4 wave phased array which has much broader frequency coverage. Tree N6TR/7 Boring, OR On Tue, Dec 27, 2011 at 4:38 PM, Jim Miller <j...@jtmiller.com> wrote: > I don't have a lot of room for antennas on my antenna restricted lot. After > doing some reading on larger antenna farms I thought that a parasitic > director added to my toploaded vertical might afford some gain toward > Europe from my MD location. I've done a bunch of googling today but didn't > find anything on this implementation specifically. Anyone have any links or > thoughts on this? > > 73 > > jim ab3cv > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
