# R: Temperature versus noise figure

• Subject: R: [amsat-bb] Temperature versus noise figure
• From: "i8cvs" <domenico.i8cvs@xxxxxx>
• Date: Fri, 16 Nov 2001 08:49:07 +0100

```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

----- Original Message -----
From: ALberto Helmfelt <lu2fgn@yahoo.com.ar>
To: <amsat-bb@AMSAT.Org>
Sent: Friday, November 16, 2001 4:18 AM
Subject: [amsat-bb] Temperature versus noise figure

> Hi All...
>
> I wish to find out the relation betewn the temperature figure, sample I
have a
> band C downconverter that says 12K  what noise figure this is.
>
> Please sombody can replay this.....
>
> Today I tried a dish,,,,,, 1.6 meters BOY y was lisining like CB well I
must say
> ten meters, bery nice i went troug 26 circular DTV ofset dish , but this
is like
> ice cream (with real cream)....
>
> Son will be making noice on ao-40...
>
> Chau
>
> Thanks for responces.
>
> AL LU2FGN
>
> www.sateliteros.com.ar
>
>
>
> _________________________________________________________
> Do You Yahoo!?
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>

----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

```

AMSAT Home