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Re: [TowerTalk] Effective of ground snow on Antenna radiationpattern

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Subject: Re: [TowerTalk] Effective of ground snow on Antenna radiationpattern
From: Jim Lux <>
Date: Sat, 13 Jan 2007 13:14:33 -0800
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At 11:10 AM 1/13/2007, Ken Kinyon wrote:
>Is anyone aware of any studies done on the effect of ground snow on the RF
>reflectivity of the soil underneath the snow?
>It is not usual for the front range of Colorado to have significant 
>snow on the
>ground for any significant length of time.
>However since  two feet of snow fell shortly before Christmas, We have had at
>least another foot and most of it is still here although compacted
>significantly.  It is my subjective observation that I an not receiving or
>transmitting as well since the snow fell.  Everything looks normal 
>with all the
>equipment. Antenna SWR and directivity seem unchanged.  Is it 
>possible that the
>snow is absorbing RF that would ordinarily reflect off the ground and combine
>with direct radiation, thereby changing the vertical radiation 
>pattern? Another
>idea is that the snow is reflecting RF, raising the effective height of the
>ground (which I assume is some feet under the actual ground normally), thereby
>making my antenna perform as though it were closer to ground.
>Yes, cabin fever makes one ponder strange things. ;<)
>Thanks and 73,

I don't know much about snow properties at HF, but at Ku-band (13.402 
GHz, to be specific), the dielectric properties change a great deal 
with temperature and moisture content.  Ice is not particularly lossy 
or conductive.  Water is very much so.
>Ken W7TS
>Kenneth E.  Kinyon
>34 Princeton Circle
>Longmont, CO 80503-2106
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