[Premium-Rx] Cubic CDR-3280 Digital I & Q output.

[GandalfG8 at aol.com]

In a message dated 15/01/2011 20:31:44 GMT Standard Time, pasha at kali.com  
writes:

It seems  you mentioned that these are digital outputs.

Some responses here seem  appropriate for analog outputs, but probably
not for digital  outputs.

There is probably someone here who knows the format and levels  of
these digital outputs.



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IQ signals are digital by definition, it's not that previous responses were 
 directed at analogue outputs but just that in amateur circles such  
signals are generally mixed down into the audio range for processing  and fed to 
the left and right inputs of the sound card to get them into the  PC.
I would recommend again the Gerald Youngblood article that I mentioned  
previously, as this may aid your understanding.
 
There are other interfaces available but ultimately these do much  the same 
job and this method is by far the most straightforward and  economical, 
especially given the wide range of excellent software that's  freely available.
 
Obviously it's important to keep signal levels such that the sound card  
isn't overloaded, and important too to make sure that the frequency range of 
the  IQ IF output is appropriate, which is basically what I said earlier!
 
regards
 
Nigel
GM8PZR