[600MRG] Rain amplitude modulation

[Eric NO3M]

I typically see a variation of 5.5 - 7 ohms R(feed) over the course of a 
year; how much of that is ground loss vs. other environmental factors is 
anyone's guess.  Radial field is approx 22,000 ft of wire over a 330x330 
ft area in an open field, closest treeline to the west is at 165-170 ft 
from the radiator.  This is over "glacial till" formed soil referred to 
as Alfisol:
  soil of an order comprising leached basic or slightly acid soils with 
a clay-enriched B horizon (subsoil).  Due to the shallow clay subsoil, 
very poor drainage.

73 Eric NO3M


On 03/16/2018 01:53 PM, Merv Schweigert via 600MRG wrote:
> I live where the salt in the ground is very high.  the soil is sandy 
> and volcanic,  the sand
> blows in from sand dunes on the shore about 2 miles distance to the 
> east of me.
> I have 120 - 350 ft radials, and 120- 60 ft radials, a former AM 
> broadcast location,  I see
> almost no change in 6 inchs of rain or bone dry summer.
> Thats why my question.   I can understand if one had only a few short 
> radials in place
> that the change would be large,  but with a large ground screen it 
> would seem there would
> not be the same change.
>
> The set up that was here was a two tower array on 830KHZ, phased to 
> null CA.  there was
> no change that had to be adjusted for between rainy season and 
> summer,  station was here
> since 1981 until I tore it down about 8 years ago.
> I am a little over a mile from the ocean,  elevation 600 ft.  it can 
> rain 6 inchs and in 15 mins
> you can drive on the ground,  so porous as it comes.
>
> Interesting to hear of so many having problems with R changes. Wonder 
> if others with a good
> ground system see such change??  Eric NO3M or Frank W3LPL ??
>
> Thanks  73 Merv  K9FD/KH6

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