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Re: Effect of Trees on S2 Band Signals



Whenever the trees or buildings are in the line of sight between the antenna
and satellite they will degrade signals. A leafy tree will easily produce
0.5 dB of attenuation per meter of thickness and a brick wall is good for
10-40 dB of attenuation. Since you have a fairly low gain antenna it doesn't
take much attenuation to make the beacon unreadable.

73,

John
KD6OZH

----- Original Message -----
From: "Barry Hawkes JR" <bhawkes@mediaone.net>
To: <amsat-bb@AMSAT.Org>
Sent: Monday, 27 August 2001 17:23 UTC
Subject: [amsat-bb] Effect of Trees on S2 Band Signals


> Hi All,
>
> I have tried five times, unsuccessfully, to receive AO-40 S2 band
> signals.  There are trees and buildings about 60 feet away from the
> antenna. I would like to know if they are close enough to significantly
> degrade the signal reception.
>
> My system is a home-brew 16 turn helix (G3RUH design) bolted to a DEM
> 2401-144 RX down converter, then through 20 feet of RG-58 coax to an
> ICOM 821H transceiver.  The antenna is five feet above ground.
>
> I use NOVA and update the keps frequently so I am certain that the
> antenna is correctly pointed.
>
> Any information will be most helpful.  (But please don't tell me to wait
> until late October when the leaves will be off of the trees.)
>
> Barry Hawkes N1BAN
> bhawkes@mediaone.net
> ----
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