Well, Im on top of a pine and oak covered hill these days and RF ground
resistance tests say it aint so hot; about 250 Ohms for the Beverages. There is
about 8-10" of compost and then very bony soil to an average of 18" before
solid rock. Now, the rock what locals call rotten granite as it just flakes
off, is likely due to a high iron content which also affects well water around
here.
Maybe I should try drilling deep into the rock and pounding down a copper clad
rod that is slightly larger diameter.
I still remember driving around when much younger how suddenly the AM BCB would
have much increased signal strengths for a short distance and there was nothing
visible in the area to account for it. Crossing over a large area of fresh
water or swamp always peaked signals even when the road wasnt elevated.
Answers are needed.
Carl
KM1H
----- Original Message -----
From: Guy Olinger K2AV
To: ZR
Cc: herbs@vitelcom.net ; topband@contesting.com
Sent: Saturday, September 24, 2011 3:30 PM
Subject: Re: Topband: Effect of current max not at base of vertical.
EZNEC's "fresh water" selection shows a conductivity of .001 (very
unconductive). So it's talking about Great Lakes fresh water away from urban
polution. Question would be how conductive the swamp water is. I would
personally guess that if the area is heavily vegetated and slow draining, the
conductivity would be higher due to dissolved compounds produced by submerged
rotting vegetation.
Anybody care to go out in the middle of your local freshwater swamp and stick
ohmmeter probes down there? The conductivity may even be layered, since the
water with dissolved materials will weigh more and the more fresh will lay on
top.
If really stinky "fresh" water marsh is as conductive as that super-rich
midwest pastoral soil we keep hearing about, it jumps up to the best of
non-salt-water results. How conductive is YOUR local fresh water swamp.
73, Guy
PS, this also applies to fairly acidic recently wet down pine straw forest
floors, like those down in flat land Carolina loblolly or oak forests. Would
vary incredibly depending on whether dry or not, or well drained with acid
leached out.
On Sat, Sep 24, 2011 at 11:29 AM, ZR <zr@jeremy.mv.com> wrote:
Ive doubted some of the claims about fresh water swamps based only on
personal experience. At a prior QTH I had them on 2 sides and extending to a
mile or more and the 160 vertical "appeared" to play better then expected.
All that rotting vegetation had to be good for something and it rarely
froze more than a few inches in the winter.
Carl
KM1H
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