Hi - neither APRS or AFSK are FM modulated. AFSK is digital and uses 2 frequencies - FM is analog and uses a wide range of frequencies.
APRS is packet based and you need to decode it - which is what your handset is doing. See if SDR has a APRS decoder plugin. Note, gqrx has a APRS decoder. -- Cinaed On 09/14/2016 09:03 AM, Gavin Jacobs wrote: > Yesterday (thanks to help here on this mail list) I got my hackrf One > working as an FM receiver. I have SDR# v1.0.0.1483 running on Windows > 10. So, today I want to move on to narrowband fm. I picked APRS channel > because there is steady traffic. I tuned SDR# to 144.39 MHz, NFM, > bandwidth 8k, LNA gain 32, VGA gain 24, amp off (also tried on), squelch > off, antenna adjusted to 52 cm. > > If I key my handheld, I see a big spike on the frequency; and if I zoom > in, it appears centered on 144.39. Meanwhile, on my handheld, I can > hear the AFSK tones, so I know there are signals coming in, but the > hackrf/SDR# doesn't change (neither frequency nor audio). > > My first guess is that I have missed some RF setting, but I've been > through the menus and can't find anything. > > Once again - any advice is welcome. > > > Jake > > > > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
