[hpsdr] ISD - more work needed

[Robert McGwier]

The short answer for these experiments is that he is not measuring noise 
floor of the sound card.  He is injecting a known signal and is 
calibrating the system.  This function is provided for in the PowerSDR 
software he is using.   Ahti then uses the power calibrated meter to 
read off MDS in the no signal condition.

Bob





Johan Maas wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>   
>
> ------------------------------------------------------------------------
>
> Athi,
>  
> Can you tell me (and the others in the list) how you are measuring 
> the noise floor?
>  
> Is there a program to determine the noise floor of a sound card?
>  
> 73 Johan PAGSB
>  
>  

-- 
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
"You see, wire telegraph is a kind of a very, very long cat.
You pull his tail in New York and his head is meowing in Los
Angeles. Do you understand this? And radio operates exactly
the same way: you send signals here, they receive them there.
The only difference is that there is no cat." - Einstein


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