[hpsdr] Questions about Mercury data

[Doug Adams]

I have a few questions concerning Mercury:

Is there any easy way, without a lot of test equipment to determine where the noise floor should be positioned on the Panadapter display All of the software available provides a "calibration" adjustment, how do you determine where to set that adjustment?
Normal receiver data (i.e. ep6 data):
What will be the expected range of values? I can see that it is made up of 24-bit samples. Is the data in some fixed relationship to the input signal, i.e. a specific input values generates a specific data value or is it somehow variable?
Wide Bandscope data from Mercury (i.e. ep4 data):
How is the Wide Bandscope data generated, I'm assuming that it is a decimated version of the Normal receiver data.
What will be the expected range of values? I can see that it is made up of 16-bit samples. Is the data in some fixed relationship to the input signal, i.e. a specific input values generates a specific data value or is it somehow variable? When I look at the frequency-domain signal on my bandscope, it seems that the broadcast band stuff is huge but most of the signals at higher frequencies are at much lower levels.
It appears that when you tell Mercury not to send bandscope data (in the StartStop Packet, 0x01 vs 0x03) I still see incoming ep4 packets but the data in them is a fixed value. Is that correct or am I doing something wrong? 

I've been following this list for some time and have found it very helpful for learning more about openHPSDR. Thanks for all the good information.

Doug Adams - K3TZR
douglas.adams at me.com





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