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Re: Working Narrowband FM examples?

From: Gavin Jacobs
Subject: Re: Working Narrowband FM examples?
Date: Wed, 4 Aug 2021 02:40:20 +0000

Look on this page:
Scroll down to: Saturday 12 December 2020 16:00 UTC

There you will find links to a flowgraph for narrowband FM on a HackRf.


Date: Mon, 2 Aug 2021 23:40:41 -0700
From: Nathan Van Ymeren <n@0x85.org>
To: discuss-gnuradio@gnu.org
Subject: Working Narrowband FM examples?
Message-ID: <20515F1E-1E1A-4FAB-A319-DF004D897EB2@0x85.org>
Content-Type: text/plain;       charset=utf-8


I am seeking a working NBFM receiver example, as the one on the wiki[0] produces unintelligible output.  I am confident that my hardware is functioning properly because if I tune to the same frequency (162.525 MHz ) in gqrx, I can hear the weather radio broadcasts clearly.  I am on OpenSUSE Tumbleweed, running gnuradio 3.8.x with a HackRF One and a standard telescopic antenna.

I have reproduced [0] verbatim except with the following change:  Instead of a ZeroMQ source, I am using an osmocom source for my hackrf. 

I’ve also tried adapting the flowgraph from the “SDR with HackRF” tutorial[1], which implements a wideband FM receiver in gnuradio, but I wasn’t able to make it produce anything resembling speech when I changed it to narrowband FM.

Additionally, I’ve tried a few NOAA weather radio flowgraphs found online but most of what I’ve found either didn’t work or else was for an older version of gnuradio and thus had errors that I wasn’t able to work around since I am a gnuradio novice.

Can anyone recommend a working flowgraph for narrowband FM, ideally something simple and working in gnuradio 3.8+?

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