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Re: GNU Radio on Raspberry Pi 4?

From: address@hidden
Subject: Re: GNU Radio on Raspberry Pi 4?
Date: Thu, 17 Dec 2020 06:26:31 +0000

Forgot to Cc: the mailing list for the record:

> You will find at http://jmfriedt.free.fr/projetM1_2020_2.pdf the description
> of our use of the sound card of the Pi4 on slide 4. Prior to running the 
> sound card
> with GNU Radio, we tested with the speaker-test application by
> 1/ activating the sound card by adding in config.txt of the first VFAT 
> partition
> the option dtparam=audio=on
> 2/ when booting, the dmesg must display 
> bcm2835_audio bcm2835_audio: card created with 8 channels
> 3/ in buildroot, alsa-utils in Target packages -> Audio and video 
> applications provides
> speaker test and executing
> speaker-test -t sine -f 440
> should play a tone on the speaker output.
> JM
> --
> JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000 Besancon, 
> France
> December 16, 2020 11:40 PM, "Dan Romanchik KB6NU" <cwgeek@kb6nu.com> wrote:
>> Has anyone successfully run GNU Radio on a Pi 4? I recently purchased an 
>> RTL-SDR dongle and thought
>> it would be fun to experiment a little with GNU Radio and learn something 
>> about SDR.
>> A couple of days ago, I fired up GNU Radio, and after having some trouble 
>> figuring out how to get
>> the audio sink to talk to the Pi, I downloaded VE6EY's FM receiver flow 
>> graph. The flow graph runs,
>> but the Pi 4 just doesn't seem to have enough horsepower to run it in real 
>> time. The audio is slow
>> and distorted.
>> Thinking that it might be the WX widgets slowing down the program, I first 
>> deleted the FFT display
>> widgets, then converted the WX slider controls to QT range controls. Neither 
>> had any effect on how
>> well the flow graph ran.
>> GQRX and CubicSDDR seem to work just fine. At least with both of them, I'm 
>> able to receive FM
>> broadcast and NOAA weather station. But, maybe the PI4 just doesn't have 
>> enough horsepower to run
>> GNU Radio? If so, that's kind of disappointing.
>> 73! <—ham radio lingo for “best regards"
>> Dan KB6NU
>> CW Geek, Ham Radio Instructor
>> Author of the "No Nonsense" amateur radio license study guides
>> Read my ham radio blog at http://www.kb6nu.com

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