[Elecraft] P3 IQ output

Edward R. Cole kl7uw at acsalaska.net
Fri Feb 25 02:21:40 EST 2011


This was one of my questions to Wayne before purchasing my K3.  He 
did state that it would be accessible eventually via the P3.  But I 
decided to go with the LP-Pan and use computer sw for panoramic 
display of spectrum (and other things).  I had thought I could use 
the SDR embeded in the K3 but there is no easy way to tap the IQ data 
stream and K3 audio is recombined so the quadrature info is lost.

But to get more than a 15-KHz bandpass one really needs to tap the 
1st IF like the P3 and LP-Pan do.  I have a SDR-IQ so could use it 
but I needed to have two channel diversity receive and two SDR-IQ 
cannot accomplish that.  Two LP-Pan slaved to one LO can.  I am still 
working on accomplishing this: http://www.kl7uw.com/LINRAD.htm

Most do not need dual IQ data streams so merely breaking out the 
sub-Rx IF will permit the P3 to display either Rx.  To use other SDR 
sw  you will either have to wait for the IQ to be implemented in the 
P3 or go with a separate SDR on the IF.


73, Ed - KL7UW, WD2XSH/45
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