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

[Clemens Paul]

To be more precise:

> One IF-IQ path is for displaying the FFT

..for displaying the IF panorama.

> and the other (the IQ demod. path) is for the audio data.

...for audio and spectrum display *of the demod. path*


73
Clemens
DL4RAJ


----- Original Message ----- 
From: "Clemens Paul" <cpaul at gmx.net>
To: <Premium-Rx at mailman.qth.net>
Sent: Saturday, February 18, 2012 1:56 PM
Subject: [Premium-Rx] R&S PR100 IQ demodulation mode?


>
> 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
>
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