Antenna Mania

Every year when it gets cold, I get the urge to do antenna work outside. This year I got done early, before the snows came. I am assuming we will have snow this year now that we have discovered we are actually experiencing global cooling.

Got four antennas up now and three of them are wire antennas.

After we got the large trees in the back yard trimmed, we put up a full sized one wavelength loop for 80 meters. It is in the configuration of a square and all four supports are about 25 feet high. The feedpoint is a little lower and I use 300 ohm heavy duty twinlead to bring the feedline to a Z-match antenna tuner. Works on all bands but is particularly effective on 75 meters for comminication out to about 300 miles using an output power level of 500 watts.

The second wire antenna is a 40 meter half square. This thing is half the size of a bobtail and 90 percent as effective. It is made up of two 1/4 wave wire verticals connected at the tops with a 1/2 wavelength wire. So we have two phased verticals for about 6db gain and some very low angle radiation for DX. Feed point is at the bottom of one of the verticals and very high impedance. Using a simple parallel tuned circuit to ground for matching. 50 ohm coax feedline connected between a tap on the coil and ground.

The third antenna is a modified Windom. It has one leg at 44 feet and the other at 89 feet. Fed with 450 ohm window line to a 4:1 balun and then run to the shack with 50 ohm coax. Works on all even harmonically related bands without need for an antenna tuner. This thing is installed as an inverted vee with the center up at 46 feet and the ends at 12 feet. Other than being feed off center, it is just a plain old 80 meter dipole in inverted vee configuration.

The final HF antenna is a 20, 15, 10 meter four element beam up at 50 feet. A KT-34. The finest HF antenna ever made.

Why so many antennas? I have lots of radios. Enough to set up five operating positions. I can’t use them all at the same time but I like to have them ready for use without requiring lots of cable switching. So, I use the Windom with the Drake twins, the beam with the 737 Icom, the loop with the TS-120, and the half square with the Atlas 210X.

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2 Comments on “Antenna Mania”

  1. admin Says:

    Well, the Windom is not all it is cracked up to be. The Windom premise is that it works on all harmnically related bands without need for an antenna tuner. That may be true but not all harmonics of every frequency end up in a ham band.

    Consider this:

    3.6mhz X 2 = 7.2mhz

    7.2mhz X 2 = 14.4mhz hmmm….. maybe that is why I get a 4:1 swr on 14.1mhz.

    Guess I need to cut the dipole for 3.55mhz to get it to work well on 14.1mhz.

    Oh well, not going to use the dipole on 20 meters anyway when I have a four element beam for that band. So what does it matter? Getting better than a 2:1 swr from 3.6 to 3.9mhz on 80 meters and better than 1.5:1 all across 40 meters. All that without a tuner. Heck, it even covers much of 10 meters with a decent swr.

    Call that good and leave it alone.

  2. admin Says:

    Well, it worked fairly well, then I cut off the excess feedline, mounted the balun in a weatherproof enclosre and installed a coax connector at the radio end. Now it does not work so well except on 75 meters.

    So, I added the excess feedline back in. Rolled up the excess in the attic and now it is working.

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