Nathan, Look on this page: https://wiki.gnuradio.org/index.php/Talk:HamRadio Scroll down to: Saturday 12 December 2020 16:00 UTC
There you will find links to a flowgraph for narrowband FM on a HackRf. Jake ________________________________ 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-df004d897...@0x85.org> Content-Type: text/plain; charset=utf-8 Hello, 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+?
