[Lowfer] RX loop project update
Dexter McIntyre W4DEX
dexter.mc at gmail.com
Thu Dec 2 13:42:55 EST 2010
This has been one of those projects that I would have never started had
I know how much time it would waste :)
After at least 25 trips into the woods, about a 1/3 mile round trip for
the easiest navigable route, and up a 40% grade for about 150 feet I
finally found out why I can't tune the loop. After I strung the wire I
checked continuity which measured a few Ohms with the two conductors
parallel. For a few days I used the loop connected directly to the
coax. A while later I ohmed the conductors in order to connect the two
wires in series for a test. Then I wound and connected the transformer
for a trial. After installing the transformer I could never receive
near as good with the loop as with it connected directly to the coax.
That's when I started trying to bring it to resonance. After no success
and confused by what I was seeing I started wondering if the wires still
had continuity. This wire is very strong since the conductors are
copper clad steel. I suspect the breaking strength is several hundred
pounds. I had installed round procelian insulators at the sharp angled
that provided a nice wide radius for the wire. At the apex the tree
limb is about 6 inches in diameter and since the angle the wire travels
over it I figured that would not damage the wire. Not having an Ohm
meter with me on this trip I did a tug test figureing if the wires are
broken the jacket would break. It didn't so another trip back up the
hill. With Ohm meter in hand back at the antenna I found both
conductors wide open. I don't know where the break is but I don't plan
to fix it because this wire is history!
Dex
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