From owner-freebsd-mobile  Sat Nov 10 19:43:26 2001
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To: Warner Losh <imp@harmony.village.org>
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From: "Louis A. Mamakos" <louie@TransSys.COM>
Subject: Re: an and wi ad-hoc talking 
References: <20011110182900.Y327@numachi.com> <200111102300.fAAN0g767233@harmony.village.org> <200111110031.fAB0VS767787@harmony.village.org> 
In-reply-to: Your message of "Sat, 10 Nov 2001 17:31:28 MST."
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> At sunrise/sunset we have intersting effects on link quality.  We get
> the best signal at night (when it isn't frosting) and during the
> hottest part of the day.

Are your antennas pointed east and west?  The Sun produces measurable
noise, and in fact, is used by some to tune-up receive preamplifiers,
measure antenna gain patterns, etc.  If you're pointed near where the
sun rises and sets at the horizon, you're probably seeing this.

Also, ensure that your parabolic reflectors are painted a flat,
non-glossy color.  Note that the optical focus will be coindicident
with the the RF, and your antenna feed might get toasted.  If you're
getting sun noise, then you're probably getting sun light, too.

louie
(wa3ymh)


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