[hpsdr] mercury arrived - noise floor

[Kermit Carlson]

Georg;

   After the calibration you should see -174 Dbw/Hz 
(or very close to it) for 270K.  Remember noise power 
scales directly with the bandwidth used. 

                          73 Kermit W9XA


----- Original Message -----
From: Georg Prinz <getpri at t-online.de>
Date: Wednesday, January 14, 2009 4:52 pm
Subject: [hpsdr] mercury arrived - noise floor
To: HPSDR Reflector <hpsdr at lists.hpsdr.org>


> ***** High Performance Software Defined Radio Discussion List *****
>  
>  Hello everybody,
>  
>  I got my mercury and fired it up successfully. Nevertheless I realized
>  that the noise floor is about -95dBm and the RX-meter shows -101,5dBm
>  when the input is shortened with 50 Ohms. 
>  
>  Is this behavior ok, because the whole system is sitting on my workbench
>  without any screening case?  The power is taken from a ordinary
>  labor-supply.
>  
>  How can I lower the noise floor?
>  
>  Thank you in advance.
>  Georg, dl2kp
>  
>  
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