On 07/19/2017 11:02 AM, Chris Olson wrote: > We have been following up with regard to how SDR capabilities might be > used for obtaining time using SDR dongles as well as using the > time source product referenced in that response. > > ... > > One thing that we did not find was any reference at all to SDR > products and software for monitoring the frequencies used by > recreational Remote Controlled Aircraft. > GNUradio works well on CentOS 7, but it is a bit of an adventure to get it built. Marcus Leech's build-gnuradio.sh script works fine, and I've used it several times to build GNUradio on C7, both on x86_64 and on aarch64 (although I haven't performed that build on any of my ODROID C2s in some time and it really was a pain due to EPEL not being available for aarch64 at the time). I tried the PyBOMBS build, but it wasn't successful for me, so I reverted to the build-gnuradio.sh script. GNUradio supports a number of SDR dongles, including the RTL-SDR. An old version of GNUradio used to be in EPEL, but it's no there as of today. For general-purpose SDR work GNUradio is fine, but if you need deterministic latency you may be disappointed.