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

[Matt Blaze]

On Feb 19, 2012, at 6:18 PM, David I. Emery wrote:

> On Sun, Feb 19, 2012 at 06:06:17PM -0500, Matt Blaze wrote: >  
> 
>> I hope that's what's going on here, since that would allow me to
>> recover the actual IQ data from the "demodulated" IQ audio stream / wav
>> file.  The PR100 wav files are preferable for my purposes to the IQ
>> files, because the PR100 can be configured to pause audio recording when
>> no signal is over the squelch threshold (but the IQ is recorded
>> continuously, whether a signal is present or not).  This will make
>> capturing and analyzing infrequent signals much easier.
> 
> 	You presumably are also going to run into another issue,
> or more probably NON-issue for that app... Likely the IQ output
> that runs continuously is pre-most-AGC and wideband, likely the
> stereo one is POST AGC and only +-audio-bw (whatever they chose).
> Might make no difference, but depending on the modulation you are
> after it might...


Right - I think they specify only 12.5 KHz bandwidth max for the audio recording (which is OK for me), and up to 500 KHz (selected by IF filter BW) for the raw IQ stream.  And I can always disable the ACG.

Thanks again

-matt