RE: [amsat-bb] Date: Tue, 25 Sep 2001 11:23:45 -0500

["Robert E. Martinson" <REMartinson@xxxxxxx>]

>From CCIR Rep. 390-5  :

For elevation angles above 5 degrees

Atmospheric absorption = A/Sin(alpha), where alpha is the elevation angle,
and A is the one-way absorption for a vertical path in dB.

>From Fig. 12 (of 390-5), it appears that the vertical one-way attenuation at
less then 1 GHz is about .03 dB

73,
Bob, N1VQR


-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
Behalf Of Luis Felipe Solis
Sent: Tuesday, September 25, 2001 12:22 PM
To: 'amsat-bb@amsat.org'
Subject: [amsat-bb] Date: Tue, 25 Sep 2001 11:23:45 -0500


regards for all.

I search in a "Roger L. Freeman" book any function or ecuation to know the
aditional atenuation in a satellite link, of elevation angle in funtion of
frecuency. (minor angle, plus ATT, becasuse exist plus atmosphere).

if anyone know, more about that. I really apriciate that.

THANKS IN ADVANCE.
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