[600MRG] Rain amplitude modulation

[Brian Pease]

In northern VT over poor soil I see almost no change wet or dry, frozen 
or thawed in the tuning of my inv-L, which is 50 ft high with 300 ft 
horizontal.  I saw a far greater change last night when I moved 1.2kHz 
up the band for my WSQ contact.  I have 137 radials 100 ft long plus 6 
parallel ground wires under the horizontal part. With remote tuning (not 
matching), my reflected power stays well below 1 Watt with 100 forward.  
No snowshoeing 300 ft to re-tune at this station!

On 3/16/2018 2:28 PM, Eric NO3M wrote:
> 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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