On Sun, Jan 22, 2017 at 7:53 PM, Andy Walls <a...@silverblocksystems.net> wrote: > On Sun, Jan 22, 2017 at 7:19 PM, Luke Berndt <l...@robotastic.com> wrote: > >> Well, there was definitely a lot of noise! and I am pretty sure the source >> was my computer. I got a couple of USB extension cables so I could get away >> from the computer and the USB hub and that helped a lot. I was able to noise >> floor by about 20db. >> >> Almost every transmission is coming in clear now. > > Yay! > > >> Oddly enough though when I >> do a debug recording, it still doesn’t give me the 4 distinct levels. Any >> thoughts on what could be up? > > You might be looking at a section of the IQ where there is no > transmission ongoing? > > Or you've tweaked something (e.g. baseband level with a multiply > const) such that the > joint tracking loop in the 4FSK demod block loses track of the symbol clock? > > IDK.
FWIW, the gr-op25 block I'm using came from: git://op25.osmocom.org/op25.git the head of the master branch. At the time I checked it out, the head commit was: commit d34fbe52edcfcb79dac349f221e5181adcf2eb8f Author: Max <ikj12...@yahoo.com> Date: Wed Oct 7 16:08:29 2015 -0400 reduce skip time My GNURadio is from the head of the master branch from a few weeks ago: v3.7.10.1-191-g0971afba - Andy >> Here is an example of the new and improved reception: >> https://www.dropbox.com/s/7is60h94ctf6d0t/34800-1485122982_4.90888e%2B08.raw > > With this file, and the flowgraph I provided to you, I get the four > levels (see one of the > two attached pictures). The levels are a little noisy, but the symbol > slicer should sort > them out with only a few errors, and error correcting code should fix > the stray symbol errors. > > There are parts in the IQ data where no transmission is being sent, > which will look like a > mess. See the second attached picture. > > > >> - Luke > > Regards, > Andy _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio