Topband: Beverage construction questions
Sat, 25 Aug 2001 10:01:38 -0700
>I was planning on using 17 gauge aluminum electric fence wire, but I'm abt
>to decide that would be a mistake. I've got both a 1wl and 2wl beverage in
>mind. Can I get away with using #16 or #18 insulated stranded copper wire?
// I used surplus Gibson-girl 500-kHz emergency beacon hydrogen-balloon
tether wire, This wire is c. #20ga,, made of a Cu-Cd alloy braid over a
glass fiber core. It's strong, lightweight, stretches little, and
conducts RF well. To splice two ends together, I used copper tubing
filled with solder. To maintain 2kg of constant tension, I hung a
2-litre bottle filled with water from a rope and pulley at one end. This
provided some give when the wire was inadvertently struck at night by
owls hunting rodents.
>I plan on using 10ft pieces of 5/8inch rebar as supports for a beverage
>(the rebar will be driven into the gnd 2ft).
// I used end to end 7' and 4' fiberglass electric fence posts --
available in the Sears Farm Catalog. The end to end fastening was
accomplished with stainless-steel hose clamps.
> My question is what distance
>should the ant wire be from the piece of rebar. They make these nice
>plastic things for electric fence wire that would screw onto the rebar, but
>the ant wire would be within 1 to 2 inches from the rebar. Is this too
>close? My other idea, that requires slightly more work, is to cut a 1 to
>2ft piece of PVC pipe and clamp it to the top of the rebar and run the ant
>wire thru a slot in the pipe.
// Good idea.
>So, what should the minimum distance be
>between rebar and ant?
>If I were to use the elec fence plastic thingees, do you think that the
>rebar would rotate until the ant wire touches the rebar?
>I plan on terminating the beverage with one-fourth wavelength of wire. Is
>this one-fourth wl in free space? Or is the length not that critical?
// I found that the least resistive MF/HF ground was wire laid
horizontally just below the surface of the soil. 10' of wire was
seemingly enough to get a good front-to-back ratio.
>Tks in advance for any answers.
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.