1.2 KiB
Pico SDR
Using RP2040 / Raspberry Pi Pico as a software-defined radio receiver.
See the blog post for more information. Older code the article is mostly referring to can be found in the branch old
.
Circuit
Software
-
Clone using
git clone --recursive
as this package is using a custom USB stdio library for better throughput and to avoid deadlocks. -
Build and flash the firmware as usual:
export PICO_SDK_PATH=/path/to/pico-sdk cmake -B build src cmake --build build picotool load -f build/pico_sdr.uf2
-
Start the USB serial to TCP bridge:
python util/bridge.py
You need to have PySerial and Click packages installed.
-
Open
grc/PicoSDR-WBFM.grc
in GNU Radio Companion, adjust carrier frequency to match your favorite FM radio station and pressF6
. -
Alternatively gqrx works fine with
rtl_tcp
input mode. Maximum sample rate seem to be 400 ksps, above that the samples are dropped. Make sure to adjust LNA gain to +30 dB. It's not accurate, but it does control bias strength which in turn does affect analog gain.