A few moments ago I was able to receive the Radio-DARC-transmission from 11:00 CEST, Sunday, June 13, 2021, with my homebuilt SDR, that just became ready for a first try on the antenna.
The received sound was loud and clear.
The SDR comprises an anti-aliasing-filter, a preamp, a NUCLEO-STM32H743ZI evaluation board, an active loudspeaker and nothing else.
Reception of the AM transmission at 6070 kHz is done by undersampling the signal from the antenna by using the internal ADC of the microcontroller.
IQ-Downmixing, Filtering and AM-Demodulation is done by using the internal peripherals of the STM32H7 and by running a very small program with only a few lines of code.
A detailed explanation will come soon…
Hi
Thanks for sharing your really interesting projects on this blog and GitHub. It is impressive what can be achieved with modern microcontrollers!
I am considering reusing some of the ideas for a commercial application. Would you be willing to add some form of reasonably permissive licence to https://github.com/papamidas/H7SDR ?
G8WKS many years ago!
Hi Andrew,
I added a GPLv3 license file. Hope that helps!
73, DM1CR
Hi
Thanks for adding the licence. Unfortunately GPLv3 has very strong copyleft requirements, that make modification for commercial use problematic. There is a requirement to disclose source for any derivative software. https://snyk.io/learn/open-source-licenses/
Is the any chance you would consider Apache, BSD, or MIT licence?
73 Andrew
Hi Andrew, I changed the license to Apache 2.0
Dear Sir ,
I stumbled upon your github on H7SDR and your blog posts , and was quite fasinated by your work.
I am planning to make a similar SDR project involving an STM32F4. However since you have already done such a project , I wanted your advise on this project . Will be keen for your reply.
Regards
Hari Shankar N