[TowerTalk] Variation of Vertical T

Robert Pack nx5m at txcyber.com
Mon Nov 23 21:01:26 PST 2009


I have a bit of a dilemma for the short term.  While the construction is going on to erect a true elevated 160m vertical (36 foot high base, insulator then 120 feet above that) I need an alternative vertical for 160.  My preferred choice at the moment is a top loaded T but current circumstances just are not going to allow me to string up such an antenna between towers.  I had to remove the one I had up......or better yet........mother nature removed it for me and I cannot put it back up right now.
I do not want an inverted L although it is probably the easiest thing to do....but I do want a vertical.  I also do not want to shunt feed a tower and put down miles of radial wire.
With a top loaded T antenna in mind.........I put the vertical wire on supports up my 40m tower with the feedpoint 10 feet above the ground to a point at 105 feet up the 40m tower (95 feet of vertical wire) and instead of the top loading being in a T configuration I just slope those two wires at 45 degree angles downward.
Does it matter if the top loading wires are really horizontal or can they be sloped as described above?
I am assuming the feedpoint will be about 35 ohms so a pair of 75 ohm lines should accommodate that ok.

Anyone have any valuable input on this issue?
If I can make it work it will be a nice backup antenna for the future.

Bob NX5M


More information about the TowerTalk mailing list