[MAMS] Wind losses

[Zack Widup]

Lloyd, you probably know more about propagation on 24 GHz and above
than anyone I know. Have you noticed negative effects due to wind on
24 or 47 GHz? (Other than dish movement from the wind!)

You are on 47 GHz, right? I am hoping I get everything together and
working for 24 GHz by the May Spring microwave Sprint and after that I
am starting to eye 47088. I will probably only have as much power as a
harmonic mixer will put out unless I can find a not-too-expensive
device for power on that band.

73, Zack W9SZ


On Tue, Apr 5, 2011 at 9:41 AM, Lloyd Ellsworth <l10368r1 at gmail.com> wrote:
> I have set up and operated rover many times in very windy locations.
> It can be very frustrating, and destructive.
>
> Biggest suggestion. Advance planning. Testing. Better mechanical
> supports. Keeping to short paths, with short antennas, and horns
> rather than dishes and long antennas.
>
> As Jerry noted, the winds tend to blow away the nicely layered
> atmosphere, that promotes good DX conditions. I would support that
> observation.
>
> Conclusion I reached many years ago, along with many others, is that
> wind tends to scatter signals. I tend to use the term shred on
> microwaves. Winds seem normally to be gusty in nature. Changing speed,
> often, quickly, rather than being steady. Even direction. And on the
> Lake shore. Rarely, is it steady. This creates different atmospheric
> density zones, which affects signals, by shifting the signal direction
> slightly. As it passes from one density cell to a different density
> cell. The wind forming pressure waves. Ridges. The signal then
> slightly interfering with itself. Thus noise.
>
> Also noted, the higher the band, the greater the effect.
>
> Perhaps we need to study making use of the pressure waves, like a
> surfer uses waves near the beach shore. Gain advantage.
>
>
> 73, Lloyd NE8I/r
> EN74 etc
> ______________________________________________________________
> MAMS mailing list
> Home: http://mailman.qth.net/mailman/listinfo/mams
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:MAMS at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>