To: | kk9a@arrl.net |
---|---|
Subject: | Re: [TowerTalk] Quad vs SteppIR |
From: | david jordan <wa3gin@erols.com> |
Date: | Mon, 30 Aug 2004 13:50:29 -0400 |
List-post: | <mailto:towertalk@contesting.com> |
clarify please... Noise from point source such as a tower or building and percepitation static created when dropplets of rain or snow flakes that are charged come in contact with the elements of a bare wire or beam antenna. When pointing a low antenna at a tall tower is the direction of the storm front also in the same direction as the tall tower? Is the noise increase due to a local noise source like the taller tower or is the low beam pointing into the noise source behind it or are you hearing two separate noise sources? In the winter I can hear an approaching snow storm on my 160m dipole. Has anyone experienced a storm front in the winter listening on a beam and then turned the beam away from the approaching front and heard the noise floor drop? My experience is there are several noise source scenarios. The storm front which could be at a distance and approaching (not local percepitation static), the combination of the local static due to charged rain drops or snow flakes as well as the mass of the storm moving in the direction the beam is facing, and the third being the local static produced by the charged rain drops and snow flakes on the beam and other objects in the vicinity of the beam. I've heard the distant noise of an approaching snow storm and the distinct pops due to descrete discharges of drops of rain on the beam elements. These are very different sounding noise sources. Once the approaching storm has arrived I've not been able to hear the distinct discharges because the noise floor is too high to distinguish... I would think the Stepper would be less suseptible to the distinct discharge noise from rain drops and snow flakes because the copper elelments are protected from the charged particles by the fiberglass tubing, but would have no benefit from the noise produced by an approaching storm front or noise while in the mist of a storm. I've enjoyed using loop antennas in part because they appear to me to be less suseptible to man-made noise, esp. when fed with shielded twin lead to reduce common mode noise from long vertical runs of single coax feds. The question is really whether these noise sources prevent us from hearing that DX station we're tried to work for the past 3 years! 73, dave wa3gin kk9a@arrl.net wrote: _______________________________________________There are times during storms that my upper antennas have heavy static and the lower ones are much quieter. Perhaps your antenna is low and less prone to static than your buddies? See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA. _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk |
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