Topband: Effect of current max not at base of vertical.

[ZR]

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 at vitelcom.net ; topband at 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 at 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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