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Re: LF: s/n shown by wspr .... what is it actually showing ?

from [Andy Talbot] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: s/n shown by wspr .... what is it actually showing ?
From: Andy Talbot <[email protected]>
Date: Wed, 23 Sep 2009 21:50:57 +0100
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Its normalised to 2500Hz banbdwidth - approximately an SSB filter's worth.
 
So +20dB in 100Hz   =   -3dB in 2500Hz.  
 
Andy


 
On 23/09/2009, Graham <[email protected]> wrote:
Just watched Dave's G3YXM  wspr  signal on spec-lab ,
 
Spec-lab showed the  signal to  be a constant  20 dB over the back ground noise floor  of the  rx
so in my  book that's 20 dB  s/n  
 
The  wspr  decode is  showing -3 dB s/n ?
 
What is it  actually  displaying ?
 
G ..
 
 
 



--
Andy
www.g4jnt.com

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