NBFM problem with rtl_fm on Raspberry Pi 2

Murat Tologlu mtologlu at hotmail.com
Wed Jul 8 07:54:36 UTC 2015

Hi Hayati,


Could you please mention which commit are you using from here: http://cgit.osmocom.org/rtl-sdr/log/ 


I am doing experiments with rtlsdr codebase on both RPi and X86 Ubuntu 14.04; I can check the NBFM issue you’ve mentioned.


Kind regards,

Murat, TA1DB 


From: osmocom-sdr [mailto:osmocom-sdr-bounces at lists.osmocom.org] On Behalf Of "Hayati Aygün"
Sent: Wednesday, July 08, 2015 10:39 AM
To: osmocom-sdr at lists.osmocom.org
Subject: Aw: Re: NBFM problem with rtl_fm on Raspberry Pi 2



Hi Marcus,


librtlsdr is OK, because rtl_tcp works fine, which transfers full I/Q spectrum of ~ 1.4 MHz to SDR# on Windows/PC.

The problem must lie in rtl_fm. By the way, the I/Q demodulation "raw" mode is erroneous, too, when having compiled on Raspberry Pi 2.

Something else i could try: use the binary compiled on Raspi 1 B+ on the Raspi 2. I'll check this, this evening.


Before going for painful debugging, it would be fine if someone else could reproduce the problem .. or say that it works fine.


kind regards,




Gesendet: Mittwoch, 08. Juli 2015 um 08:30 Uhr
Von: "Marcus Müller" <marcus.mueller at ettus.com>
An: osmocom-sdr at lists.osmocom.org
Betreff: Re: NBFM problem with rtl_fm on Raspberry Pi 2

Hi Hayati,

I'm totally not used to development on Raspbian, but:
It's really strange that running the same software on the same distro
with the same RF device would give different results.

So, debugging is on :/ I'd say you should use rtl_sdr to get raw IQ
samples, and then have a look at them on your PC. If they are ok, one
would have to look a bit deeper into rtl_fm, if not, something goes
wrong on the librtlsdr side of things.

Best regards,

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