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posted by
janrinok
on Sunday April 15 2018, @12:27AM
from the one-for-the-true-hackers-among-us dept.
from the one-for-the-true-hackers-among-us dept.
We’ve become used to software-defined radio as the future of radio experimentation, and many of us will have some form of SDR hardware. From the $10 RTL USB sticks through to all-singing, all-dancing models at eye-watering prices, there is an SDR for everyone.
What about the idea of an SDR without any external hardware? Instead of plugging something into your Raspberry Pi, how about using the Pi itself, unmodified? That’s just what the Nexmon SDR project has achieved, and this has been made possible through clever use of the on-board Broadcom 802.11ac WiFi chip. The result is a TX-capable SDR, albeit one only capable of operating within the 2.4 GHz and 5 GHz spectrum used by WiFi.
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The Raspberry Pi 3B+ as an SDR – Without the SDR!
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(Score: 0) by Anonymous Coward on Sunday April 15 2018, @07:12PM
You would definitely want filters at hardware level in order to focus on a particular band, otherwise your a/d converter would be overwhelmed to cover the wide spectrum the radio is supposed to be operate on.
In the end, software is limited by the hardware capacity, in this case the wifi hardware. "Software-defined" doesn't magically turn a wifi radio into something else.