Re: [IRCA] Copper loop update 2

["Craig Healy" <bubba@xxxxxxxxxxxxxxxxxxxx>]

> Is your Sloper a homebrew? I have an Alpha-Delta Sloper, but I haven't put
> it up here at the new house. It's the one that includes MW. I bought it
> years ago for my Drake SW-2. The 135' Wire I have seems to do a great job.

It's one of the guy wires for my 80' tower. Just a length of 1/4" seven
strand guy cable.  There's a fiberglass insulator at the bottom, and it's
fed through a 9:1 transformer.  Ground is a couple of 8' copperweld rods
driven in at the end.  A few radials would be better.

> I also want to try a bev. around my yard. It will have to run at angles,
but
> I guess you just have to experiment. I will post the dimensions one day
and
> see if anyone has any suggestions. I think it will run around five or
> six-hundred feet in length when it's all said and done. Maybe a project
for
> my Fall Break in a few weeks...

As straight as you can get it will work best.  Hopefully in a direction
where it will do something for you.  Some people have had good luck with a
big horizontal loop.

> Oh..where did the toroid come from? What size, etc? And how did you solder
> it to the coax connector? I'm very ignorant when it comes to the technical
> side of things.

That particular one is a J. W. Miller F-240-1 which is long discontinued.  I
picked it up from a back shelf of a local electronics house.  It had
probably been hanging there for 20 years.  The coax connector is a SO-238
chassis mount.  I soldered some #16 wire to one of the mount holes, wrapped
six turns through the toroid, and soldered the other end to the center pin.
Once built, it was slipped over one of the copper tubes before I soldered
the tubes together.  There's some friction tape over the windings for
physical protection.  I have some ferrite toroids out of a Harris SX-5
transmitter I will probably use for the next one.  Most any large enough
core of appropriate mix for BCB use will work.  Nothing magic here.  More
turns probably would be better.  I'll try 20 turns on the next one.  I'll
also waterproof it with some epoxy.  This was just a temporary test unit.

Craig Healy
Providence, RI


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