[Hackrf-dev] Narrowband fm - what is the secret?

[Gavin Jacobs]

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
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