Wow - magic!! Works like a champ on my latest data as well! So how did you figure out the descrambler settings? I was running a program attempting all permutations this morning and so far, couldn't create one that worked.
Thanks!! -Tom On Sun, Mar 27, 2016 at 12:20 PM, Andy Walls <[email protected]> wrote: > On Sun, 2016-03-27 at 14:03 -0400, Andy Walls wrote: > > On Sun, 2016-03-27 at 12:00 -0400, [email protected] > > wrote: > > > > > > Message: 5 > > > Date: Sat, 26 Mar 2016 15:05:02 -0400 > > > From: Andy Walls > > > > > > From: > > > > Tom Golden > > > > Subject: > > > > Re: [Discuss-gnuradio] Ettus N210 > > > > GMSK 9600 > > > > Date: > > > > Sat, 26 Mar 2016 10:12:18 -0600 > > > > > > > > I've been staring at the de-modulator and I really think it's > > > correct. > > > > Unfortunately amateur packet radio isn't well documented (at least > > > for > > > > me). > > > > > > > > > > > > I think there's a scambler I'm not taking into account. Does anyone > > > > know the specifics of this? Or can point me to how to what the > > > > parameters of the descrambler block mean and/or how to determine > > > their > > > > settings (my best guess is it's a 17-bit LFSR with a polynomial of 1 > > > > +x^12+x^17)? > > > > > > > > > I can't help with the descrambler, sorry. There are some AX.25 pages > > > out there that talk about it; you've probably seen them already. > > > > I was able to figure out the descrambler. :) > > > > The attached flowgraph now has the HDLC deframer spewing out test data > > packets full of 0x44's. > > Oopsie. Flowgraph attached for real this time; not just the generated > python. > > -Andy > > > The radio appears create a pretty long idle stream (repeated HDLC flags) > > at the start of a burst. > > > > Regards, > > Andy > > > >
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