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[TowerTalk] Vertical in the swamp

Subject: [TowerTalk] Vertical in the swamp
From: "Carrington, Walter" <>
Date: Tue, 13 May 2008 11:18:40 -0400
List-post: <">>
Is swamp water conductive?
Fresh water swamps have a lot of stuff suspended or dissolved in the water. The 
conductivity might be much higher than pure water.  
A quick google:
Great Salt Lake = 158,000 uS/cm
Salt water is about 50,000 microSiemen/cm  (uS/cm)  
Atlantic Ocean = 43000 uS/cm
Drinkable water -- less than 3000 uS/cm  (and you'd prefer <1000 )
Irrigation water -- 3000 to 6000 for  salt tolerant plants.
Lake Mead = 850 uS/cm
Lake Superior = 97 uS/cm
Soil conductivity in New England = 10 to 20 uS/cm  (Map ARRL Antenna Handbook).
Deionized water = .05 uS/cm
"Fresh" water swamps =  250 to 37000 by one Australian study,  but conditions 
were strange there (the 37000 was almost dry,  all were drying out).
My guess for swamps = 250 to 3000 

>From what I can find online,  your conductivity ought to be 10 to 100 times 
It ought to be more conductive than Lake Superior for sure, i.e., substantially 
better than a clean lake.
If your swamp gets drier seasonally the conductivity should go up when it's 
drier but still liquid.

These numbers make it look like a fresh water swamp will be better for radio 
than almost all soils and most fresh water lakes but not as good as salt water.

I wonder if the swamp at the bottom of my hill helps on 2 meters.
--Walter, K1CMF

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