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28 Foot Experimental Vertical

This was constructed to prototype and better understand vertical antennas.

The purpose for displaying here is to show others how simple the experimenting

can be and to (hopefully ) get a little constructive feedback for further experiments.

The top mast is from a salvaged CB antenna and is about 18 feet long.

The lower mast is a piece of generic TV antenna mast.

The pivot on the bottom comes from Radio Shack.

The plastic crate that the mast is setting on is a Coke soft drink case serving as a

ground insulator.  It is spiked to the ground with four gutter spikes.

The mast is bracketed to the shed without insulation. I choose to ignore losses and I

don't feel my 100 Watts will create any problems.

The subject antenna is in the foreground.

The tower in the background is a crank up from the late 1970's.

 

Same view, just back a bit.

This shows the bracket and the connection between the upper & lower mast. The jumper

wire is the point where an inductor my be inserted. I use Stainless hose clamps to make the

electrical connections.

Same subject, different angle.

This is the plastic box insulator that keeps the mast from being grounded.

I keep looking for a suitable wine bottle to replace it!

I found this plastic box at the home improvement store that is intended as an enclosure for a lawn sprinkler valve.

It works great as an insulator and support for the bottom of the antenna. I think it was about $13.

Same subject, different angle.

Here is the base loading coil I used to match it on 40 and 80 meters. What you see is

the 80M tap. The 40M tap is only a couple of turns and the 160M tap is about 3/4 of the

length.  The loading coil alone does not provide a good match but is usable on 40, iffy

on 80 and unusable on 160. I got a little better results using a Dentron Jr. match box.

The antenna complied with the EZNEC model.

I believe that a good match would be  accomplished by applying the TLW program

that is supplied with the ARRL Antenna Handbook. I have not pursued this yet

because I am reluctant to buy suitable capacitors until I am certain I cannot make

them. 

 

What appears to be an AC line connector is my radial connector. I use AC extension

cords plugged into this connector as radials. Primitive, but expedient. I have a

number of long cords that are easily deployed and recovered.  Remember, this is a

learning tool, not a permanent antenna!

Same subject, different angle.

Next Page, the investigation!

Adding the SGC-237 Auto Tuner

More to come later as I progress!