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Something Different

Posted: Wed Jan 31, 2018 9:15 am
by anomaly
I heard that in the 1970's someone found out computers emit a weak radio signal when they're processing things, apparently back then someone was able to somehow program an old Altair computer to play a song on their AM radio in beeps and chirps. I think that sort of thing is really interesting and I'd like to recreate the experiment with modern computer equipment. I have an SDR radio (Model: R820T2 RTL2832U), but I don't know what frequency ranges to search for the RF coming from a computer. So I thought I should ask the community if anyone has an ideas for where I should begin? Or if any of you have one of those meters/detectors that might be able to point me in the right direction? Thanks in advance for your replies.

Re: Something Different

Posted: Wed Jan 31, 2018 5:20 pm
by alkinoy

Re: Something Different

Posted: Thu Feb 01, 2018 4:13 am
by rtlsdrblog
Have a look at these posts, some interesting results can be obtained with just RTL-SDRs.

https://www.rtl-sdr.com/transmitting-rf ... n-your-pc/

https://www.rtl-sdr.com/tempestsdr-a-sd ... diated-rf/

Re: Something Different

Posted: Thu Feb 01, 2018 10:31 am
by Rufty
Well, there's the Raspberry Pi Fm transmitter:
https://www.raspberrypi.org/magpi/raspb ... ansmitter/