Re signal improvements when over fresh water or swamp I've notice that many
times on VHF or FM radio in the car and always simply suspected the effects of
being in the clear without obstructions like buildings and trees.
Pete W2PM
-----Original Message-----
From: ZR <zr@jeremy.mv.com>
To: Guy Olinger K2AV <olinger@bellsouth.net>
Cc: topband <topband@contesting.com>; herbs <herbs@vitelcom.net>
Sent: Sat, Sep 24, 2011 11:35 pm
Subject: Re: Topband: Effect of current max not at base of vertical.
Well, Im on top of a pine and oak covered hill these days and RF ground
esistance tests say it aint so hot; about 250 Ohms for the Beverages. There is
bout 8-10" of compost and then very bony soil to an average of 18" before solid
ock. Now, the rock what locals call rotten granite as it just flakes off, is
ikely 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
od that is slightly larger diameter.
I still remember driving around when much younger how suddenly the AM BCB would
ave much increased signal strengths for a short distance and there was nothing
isible in the area to account for it. Crossing over a large area of fresh water
r swamp always peaked signals even when the road wasnt elevated.
Answers are needed.
Carl
M1H
----- 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
nconductive). So it's talking about Great Lakes fresh water away from urban
olution. Question would be how conductive the swamp water is. I would
ersonally guess that if the area is heavily vegetated and slow draining, the
onductivity would be higher due to dissolved compounds produced by submerged
otting vegetation.
Anybody care to go out in the middle of your local freshwater swamp and stick
hmmeter probes down there? The conductivity may even be layered, since the
ater with dissolved materials will weigh more and the more fresh will lay on
op.
If really stinky "fresh" water marsh is as conductive as that super-rich
idwest pastoral soil we keep hearing about, it jumps up to the best of
on-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
loors, like those down in flat land Carolina loblolly or oak forests. Would
ary incredibly depending on whether dry or not, or well drained with acid
eached 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
ersonal experience. At a prior QTH I had them on 2 sides and extending to a
ile 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
ore than a few inches in the winter.
Carl
KM1H
------------------------------------------------------------------------------
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1410 / Virus Database: 1520/3917 - Release Date: 09/24/11
______________________________________________
R RST IS ... ... ..9 QSB QSB - hw? BK
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
|