I happen to be playing with GnuRadio 3.8 and NI USRP-2901 when working on my thesis. I just created this transmitter while learning some concepts.
Relevant files can be found here in this drive folder.
(.grc, .py and .svg)
The equation used is from wiki page on FM broadcasting:
![\left[0.9\left[{\frac {A+B}{2}}+{\frac {A-B}{2}}\sin 4\pi f_{p}t\right]+0.1\sin 2\pi f_{p}t\right]\times 75~\mathrm {kHz}](https://wikimedia.org/api/rest_v1/media/math/render/svg/352564238bba8445f52cd99f8919979aece6ca39)
Flowchart:
The window should look something like this:
Happy learning!
PS: irrelevant notes about raspi 4:
I had also tried it with Raspberry Pi 4 Model B and it works well with 24k sample rate. UHD building from source required -DCMAKE_SHARED_LINKER_FLAGS="-latomic" and also one explicit execution of /usr/bin/ld with -latomic flag added.
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