Re: [AFMUG] multipath on a reflector

[Bill Prince]

When Ken was here, he would relate tales about the height of the corn fields affecting multipath. One of the things you can do is raise the height of the SM to get out of the multipath zone.

bp
<part15sbs{at}gmail{dot}com>

On 3/11/2021 1:21 PM, Brian Webster wrote:

Doe this customer have the issue at a certain time of the day? Maybe around sunrise or sunset. It may be possible that it’s not multipath but at certain times of the year the antenna has a good path to picking up noise from the sun and that could be stronger than your AP signal? This usually is exhibited on paths that have an East/West orientation. Depending on the gain of the antenna it can be worse than others. Think of the sun either just above the horizon at sunrise or sunset and the focal beam on the antenna is such that it picks up that noise enough to be stronger than the AP. Depending on the time of year, tilt angle of the Earth etc., it looks like a seasonal issue.

 

Thank you,

Brian Webster

www.wirelessmapping.com

 

From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of Steve Jones
Sent: Thursday, March 11, 2021 1:36 PM
To: AnimalFarm Microwave Users Group
Subject: [AFMUG] multipath on a reflector

 

our APs sit between 90 and 110 feet on average in flat terrain so we deal with alot of seasonal ground reflectivity issues. We have this one customer presenting again with whats probably multipath fading, I had tried putting a shield on the bottom half of the reflector once out of curiosity. It didnt do much

what im wondering though is how the ground reflected multipath feeds into the feedhorn.

is it reflecting off the top half of the dish and into the feedhorn like a mirror?

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