At first I thought rtl_tcp was the way to go, but after looking at the code, it doesnt seem to support wide band FM, which led me to rtl_fm instead.
Also, when using rtl_tcp as a server, I found my signal strengths were weaker when connecting to the rtl_tcp server with GQRX. I changed gqrx back to use the USB dongle directly and then i click the hardware agc checkbox - which gives me better signal strength.
Is that not typical behavior? Maybe I'm not configuring something correctly?
Thanks :)
Any reason that you couldn't use rtl_tcp instead?
It's pretty common to run rtl_tcp on a remote RPi server,
then use a different, local computer to host GQRX.
Squelch, frequency changing, and other features should be
available via that protocol presently.
--
Tom Swartz
On Mon, Jan 07, 2019 at 05:01:37PM -0500, Mark Russell wrote:
> Good evening -
> I am trying to make modifications to rtl_fm so that I can change
> frequencies, gains, modulation types, and squelch values on the fly (and
> thus avoiding a restart).
>
> Its unclear to me what functions need to be called in order to apply
> changes to the sdr device so that I can do the above. The rtl_fm code isnt
> documented so I dont have much to go off of...
>
> GQRX doesnt run reliably on any RPi3's I've tried so I hoping to use a
> modified rtl_fm in its place. Any help would be appreciated.
> Thanks :)