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translated msg de I8CVS



Here is a translation of an interesting message (originally in Spanish) 
provided by Frieda, N2JWL (ffeller@erols.com).

73, art.....

=================================

Hello Alberto, LU2FGN

First you have to convert the temperature equivalent of noise T in factor 
of noise F utilizing the following relation:

F= (T / 290 ) + 1

Second you have to convert the factor of noise F in "noise figure" NF (db ) 
utilizing the following relation:

NF = 10 log F  (dB)

Example:
To calculate NF with reference to this data:

Temperature equivalent of noise T = 12 kelvin

F = (12 / 290) + 1 = 1,041

NF = 10 log  1,041 = 0,18 dB

I hope to contact you very soon on AO40

At the moment the only active Argentine station on AO40 L/S is Daniel, LU2DDU

73 from i8CVS Domingo

At 07:10 AM 11/16/2001 -0500, you wrote:

From: "i8cvs" <domenico.i8cvs@tin.it>
To: "AMSAT-BB" <amsat-bb@AMSAT.Org>, "ALberto Helmfelt" <lu2fgn@yahoo.com.ar>
Subject: R: [amsat-bb] Temperature versus noise figure
Date: Fri, 16 Nov 2001 08:49:07 +0100
X-Mailer: Microsoft Outlook Express 5.00.2615.200
Sender: owner-AMSAT-BB@AMSAT.Org

Hola Alberto,LU2FGN

Primero usted tiene que convertir la temperatura equivalente de ruido  T en
factor de ruido F utilizando la seguente relation:

F= ( T / 290 ) + 1

Segundo tiene que convertir el factor de ruido F en
"noise figure" NF ( dB ) utilizando  la seguente relation:

NF = 10 log    F          (dB)
                    10

Exemplo:
Calcular NF con riferimento a sus datos:

Temperatura equivalente de ruido  T= 12 kelvin

F= ( 12 / 290 ) + 1 = 1,041

NF = 10 log    1,041  =  0,18 dB
                    10

Espero de contactarte muy pronto en AO40

Al momento la unica estation argentina activa en AO40 L/S es Daniel, LU2DDU

73 de i8CVS Domingo

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