On 22/03/2023 18:42, jmalo...@umass.edu wrote:
Nothing interesting, I am currently just “toying around” to understand 
the device(and sdrs) better, and the lowest the closest available 
signal generator I have goes to 100 khz. I was using 3 Mhz before but 
I figured if the API was telling me that it was able to be tuned lower 
than why not try reducing the input frequency.

I am currently just interested in trying to interpret the data that comes from the ADC. I saw on the daughterboard there is a lot more going on than just two mixed signals, so I am asking if there any particular formula or considerations I should be making when trying to recover the original signal. Ideally(for my application), I would be able to directly sample voltages on the antenna, but since that is not possible I need to work around this instead.

_______________________________________________
USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-le...@lists.ettus.com
What you get in I/Q signals is a *linear proxy* for the instantaneous voltages appearing on the antenna terminals.    If you really   want just a high-speed ADC, there are other products out there that are closer to what you need.   Trying to cajole a *radio*   into being a laboratory high-speed ADC, without regard to its "RFness" is asking for heartburn.
Signals are typically filtered and  amplified and mixed-down to 
baseband, filtered and amplified again, and then presented to
  a *complex* ADC.  After that, the signals are usually digitally 
filtered and down-sampled to produce an alias-free complex-baseband
  to the application at the requested sample rate.

https://getmyuni.azureedge.net/assets/main/study-material/notes/electronics-communication_engineering_analog-communication_complex-baseband-representation-of-bandpass-signals_notes.pdf

But if you're looking to *measure* actual voltages as seen at the antenna input, you cannot do that directly with a typical   radio (whether analog or DSP).   But what you *can* do is engage in a *calibration* process using sources of known   power--this works because the transformations described above are all more-or-less linear.
_______________________________________________
USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-le...@lists.ettus.com

Reply via email to