Topband: Topband T-Vertikal for ZK1Expedition

[George & Marijke Guerin]

Magnus, et. al,

Just put up an inverted L over many radials.  The total length of wire 
should be 0.25 wavelength (39 - 40 meters).  Go as high as you can with a 
rope over a tree with an insulator to pass the wire through and then tie off 
the rope and take the rest of the wire to another tree with an insulator and 
rope at the end of the wire.
With 30 radial wires about 20 meters long each, the feed point impedance 
will be about 22 ohms, so take an L-net tuner or a 9:4 UnUn or transformer 
to feed it with 50 ohm coaxial cable.  The tuner can be at the radio or the 
antenna feed point.  It does not matter much.  If you put an 80 meter trap 
at 20 meters, and shorten the wire about 4-5 meters, you can use it on both 
80 & 160.

I have trap information if you need it.

73        Good luck        George    K8GG



----- Original Message ----- 
From: "Magnus A" <sm6wet at telia.com>
To: <topband at contesting.com>
Sent: Tuesday, January 25, 2005 12:36 PM
Subject: Topband: Topband T-Vertikal for ZK1Expedition


> Hi!
>
> Am currently working on some antennas for our soon to come ZK1 expedtion 
> in February and have some thoughts on 160m as alot of request have come my 
> way for people wanting ZK1 South and North on 160m.
>
> Now, we have several 20m high palmtrees which can be used and my first 
> thought was a Invert L ...snip...

> 73 de Magnus SM6WET  (soon ZK1WET)