You can remote the tuning cap by using 1/2 wl of coax. This will be something in excess of 150 feet, depending on velocity factor. The antenna won't know the 1/2 wave is there.
Rick N6Rk Phil Clements wrote: > Much has been written about matching 160 meter shortened vertical > antennas, > but very little about 160 meter antennas that are too long. There were two > great articles in the old "Communications Quarterly" in 1998 about > elevated > ground planes, but I have lost them over the years. My current system was > built from these articles. > > > > The system here is a 195 foot Rohn 25 tower, with insulators at the 60 > foot > level. The five sets of guy wires are all insulated from the tower, and > additional insulators along their length to be invisible to 160 meter RF. > The guys at the 60 foot level, just below the tower insulators are > utilized > as the radials that form the ground plane. They are 110 electrical degrees > long. The system resonates at 1510 KHz, requiring a capacitor connected > across the feed point. 600 pf brings the system into resonance @ 1830 KHz. > > > > There will soon come a day when I will not be able to climb to the 60 foot > level to adjust the matching capacitor when needed. The question is: Can I > place the capacitor at ground level, connected to the original feed point > via coax or open-wire line? Will this 60 foot line radiate? I do not want > to > upset the radiation pattern of the system. I tried a motorized vacuum > variable several years ago, but it was a high maintenance item due to > exposure to the elements. > > > > I am open to all suggestions; perhaps some brand new ideas will surface > from > all the expertise on this reflector! After 57 years on the air, I am > still > learning, and trying to make improvements here! > > > > Thanks in advance for any/all comments. > > > > (((73))) > > Phil, K5PC > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK > > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
