RPi is FM Radio (no extra parts)

michaelkellett over 13 years ago

I knew there was something useful it could do ........

http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter

(Thanks to Jan Panteltje on sci.electronics.design for bringing this to my attention)

wallarug over 13 years ago

I have already got this going about a month ago! It is a great project idea!

BUT...

The website clearly says that you need to have the music formatted to: 44100 Hz @ 16 bit Mono which is WRONG!

After testing I discovered that the music accually needs to be in the format of "16 bit resolution [mono] with 22 050 Hz timing!!"

You can see my full research in this forum link: http://www.element14.com/community/thread/25073?tstart=30
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johnbeetem over 13 years ago

Reminds me of the Altair 8800 program that played monophonic music over an untuned AM radio. It played "Daisy Bell: the Bicycle Song".

This was before home computers had FCC regulations.
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e14 Contributor over 13 years ago

If you've got an amateur radio license try https://github.com/threeme3/WsprryPi

The RPi operates as a WSPR beacon - as the output is square wave you MUST add a filter for the ban you're working.
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morgaine over 13 years ago in reply to johnbeetem

These are fun RF projects for converging amateur radio clubs + hackerspaces. (Good RF instrumentation required.)

I wonder if the BBB's two PRUs could be harnessed for the job. They could be run in time sync to generate I+Q quadrature outputs to feed into an RF mixer, or the reverse on receive --- a good use for the PRU's extremely tight realtime behaviour, at least in principle.

Computers and radios tend to be mutually hostile neighbours, so it's good to see radio amateurs making them cooperate nicely under the SDR banner. My eye is on Parallella for this.
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e14 Contributor over 13 years ago

The first thing that came to my mind when I was reading this, is a sweet car FM transmitter for your ipod/mp3 player. Im sure there is a lot more leg work that needs doen for that to happen, but that would make a really sweet project.
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