[Hackrf-dev] Amateur radio with HackRF One and gnuradio

[Scott Davis]

I don’t think this list is attachment-friendly, so I’ll send a screenshot of my 2m Rx flowgraph to your email address.  Don’t panic -- it’s way more complicated than you need for starters.  I was looking at 3 FFTs — RF, IF and audio, and I included an audio band-reject filter to get rid of CTCSS tones from repeaters.  Also had a variable RF gain control, a channel selector and a simple variable squelch.  

However, the basic “Hello world” ought to work fine if you just change the frequency to your target, and replace the WBFM receive block with an NBFM receive block at 5kHz deviation.  Maybe that’s what’s causing your distorted audio…?

-Scott K5TA

On Sep 9, 2015, at 3:45 PM, R. Niles Vaught <nvaught at bellsouth.net> wrote:

> Thanks for the replies and info.  Hello world with broadcast FM works and sounds great.  VHF/UHF specifically poor audio on rx; the voice is there but sounds terrible.  I haven't tried any tx yet.  Scott would you be willing to share your flow graphs for 2m and 70cms?  And Chuck, I do have the ham-it-up adapter; once I have VHF/UHF working I'll look at that.
> 
> 73!
> 
> Niles
> K4RNV
> 
> 
> 
> 
> 
> On Wednesday, September 9, 2015 2:02 AM, Scott Davis <scottk5ta at gmail.com> wrote:
> 
> 
> >but my personal attempts to use HackRF One and gnu radio on the ham bands have resulted in very poor audio.
> Thanks in advance
> NilesK4RNV
> Poor audio in what respect?  Tx?  Rx?  I have had good luck transmitting and receiving NBFM on 2m and 70cm, completing several two-way (albeit short-distance) contacts.  The only funky feature was the lack of “transceive” capability — I used 2 separate flowgraphs, and clicked to switch between them, which takes a couple of seconds.
> 
> -Scott K5TA
> 
> 
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