[TowerTalk] Rain drops noise on Yagi (dipole)

[Chuck Dietz]

I have used quads and Yagis. The quads were always lower, but on a separate
tower. I used bare wire for the quad loops (4 el, tri-band).  The quad
sometimes had some rain noise, but always lower than the top Yagi. My
feeling was that each charged raindrop makes an electrical impulse noise
when it contacts the highest elements. It loses it’s charge as it gets
closer to the ground. The quad elements are a loop, so the electrical
impulse goes two directions and cancel out. The desired waves are much
larger than the raindrops and interact differently with the quad loop.

Chuck W5PR

On Thu, Dec 6, 2018 at 10:25 AM Richard Smith <n6kt1 at sbcglobal.net> wrote:

>  Bob and John,
> Have either of you had a cubical quad at your station, so that you could
> switch between a yagi and a quad, and observe whether the quad had lower
> noise? From what I have read, it seems to be reported very often that a
> quad is much quieter during times of rain static.
> 73, Rich, N6KT
>
>     On Wednesday, December 5, 2018, 6:11:40 PM PST, john at kk9a.com <
> john at kk9a.com> wrote:
>
>  I have similar QRN results as KQ2M using my homebrew OWA beams. At first I
> thought it was related to the OWA design but according to everything that I
> have read by W8JI and others, it is not. In my case during rain static
> events, no antenna is quiet however lower is definitely better. I use
> MicroHAM micro STACK switches and with a simple button push I can disable
> the noisy antenna on RX but it is a pain to operate that way. I believe
> that
> there is a way to automate switching so it transmits into all antennas and
> receives using just a lower one but I have not attempted this.
>
> John KK9A - W4AAA
>
>
>
> Bob Shohet, KQ2M wrote:
>
> I have had difference experiences than Jim.  When the rain static is
> horrible (at the level where is sounds like the drumming section in a large
> marching band  ;-)  the the top yagi is always the loudest in Ierms of
> hearing rain static, it is NOT the only one that gets it and that has been
> true whether it has been 10, 15 or 20 meters.  What happens at my qth is
> that the top is the loudest by far, the 2nd one down is moderately loud,
> the
> 3rd one down has some static and the 4th one down (bottom) is quiet.
>
> With lower levels of rain static, the top is still the loudest but the 2nd
> and 3rd one down may not experience any.
>
> I use 5L Hygain HG205CA, 155CA and 105CA's.
>
> 73
>
> Bob, KQ2M
>
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