Well, it's not polished yet, but preliminary tests show that the Raspi has enough power to do some simple NFM software-defined radio work with RTL2832U-based DVB-T USB TV tuners.
I was able to compile rtl_fm (an optimized version of Osmocom's rtl-sdr software), which allowed the Raspi to tune a frequency (162.55 MHz, weather radio band in the US) and play it real-time. The Raspi's internal sound kept hanging, so a cheap USB audio device was used instead. The audio is choppy, but CPU usage is only around 62% - which is promising.
Raspi and RTL-SDR
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- Joined: Sun Jun 03, 2012 2:27 am
Was the dongle powered by the Pi or externally?
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- Joined: Wed Jun 20, 2012 5:31 pm
By the Pi. The Pi itself was powered with a 2A power supply (originally an HP Touchpad power adapter).
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- Joined: Sun Jun 03, 2012 2:27 am
Thought ot using the Pi as a USB-IP converter and piping the feed back to a more powerful PC running an SDR app in a VM?
Would this work? You can get away from thePC's RF noise, and keep the tuner close to the antenna this way..
Would this work? You can get away from thePC's RF noise, and keep the tuner close to the antenna this way..
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- Joined: Tue Aug 14, 2012 9:31 pm