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

[GandalfG8 at aol.com]

In a message dated 15/01/2011 18:51:09 GMT Standard Time,  
wombat5 at ntlworld.com writes:

I have a  Cubic CDR-3280 with a Quadrature Digital IF output (I&Q). What 
can this do  for me? What can I connect it to? I have the manual and there is 
no  information on this.
Hi John
 
Welcome to the world of SDR:-)
 
IQ signals can be processed sing DSP software to demodulate any  form of 
modulation, let alone all the follow on filtering that DSP  allows, and 
there's a wealth of free software online for use with simple  front ends, such as 
the Softrock receiver series, which generate the IQ signals  for just this 
purpose.
 
If you Google on Gerald Youngblood, think that's spelt right, you  should 
find his articles from QEX or QST of a few years ago which kick started  
amateur SDR.
 
For software Google should help again but a starting point might  be Winrad 
and it's later derivatives. Some later versions are enable for  also 
controlling various receivers but that part probably wouldn't be of  much use to 
you.
 
Processing is usually carried out by feeding the IQ signals to the line  
input of a soundcard in the PC running the software, so you would need to 
check  compatibility as regards levels and frequency range of your signals.
 
regards
 
Nigel