[Premium-Rx] R&S PR100 IQ demodulation mode?

[Clemens Paul]

 Maybe it's similar to the EB510
 (google for EB510_bro_en.pdf,
 a nice brochure with good explanations and SDR basics):

 One IF-IQ path is for displaying the FFT
 and the other (the IQ demod. path) is for the audio data.

 73
 Clemens
 DL4RAJ



 ----- Original Message ----- 
 From: "Matt Blaze" <matt at crypto.com>
 To: "Premium Receivers" <premium-rx at mailman.qth.net>
 Sent: Saturday, February 18, 2012 5:30 AM
 Subject: [Premium-Rx] R&S PR100 IQ demodulation mode?


> Hi all,

>Apologies for not being very active here lately, but perhaps someone
 >knows the answer to this surely terribly dumb question.

> I recent got a Rohde & Schwarz PR100 portable receiver (this is
 >their current model, replacing the EB200).  One of the features that
 >I really like is its ability to store on an SD card (or stream over
 >the network) baseband IQ data, for up to a 500KHz band.  (This
 >effectively allows you to store a little chunk of spectrum for later
 >analysis.)  This is independent of the demodulation mode -- the same
 >data is stored (or streamed) whether you're demodulation the audio
 >as FM, AM, CW, whatever.  (Demodulation happens after the IQ data is
 >calculated).
>
> OK, I understand the principles of IQ data, and I've managed to 
> parse the R&S IQ data format, so all is good there.  But the 
> receiver ALSO has an "IQ" demodulation mode.  And I can't for the 
> life of me figure out what it's for, what it does, or what the audio 
> actually is.  It seems to inject a BFO, but it's neither FM nor AM.
>
> Any idea what this mode is?  The manual is of sadly little help.
>
> I vaguely recall the EB200 also had IQ demodulation, and I didn't 
> understand what that did, either.
>
> Thanks for any advice!
>
> -matt