John, It would be my pleasure to run the PSK-R modes through the simulator. I'll post the results here on the reflector.
Thanks for the Q15X25 info. Tony -K2MO ----- Original Message ----- From: vk2eta To: digitalradio@yahoogroups.com Sent: Tuesday, January 19, 2010 7:35 PM Subject: [digitalradio] Re: NVIS Path Simulations - Darko, 9A2LI Tony, Would it be possible to get the same test for the PSK "Robust" modes as in the alpha version of Fldigi? http://www.w1hkj.com/alpha/fldigi-flarq/ I would really like to have an idea of what the simulator says since we found in practice reasonable NVIS performance (to our surprise). They are basically a BPSK mode with FEC (like PSK63F), but with an interleaver added for time diversity. It would be great to see how the 3 speeds fair (PSK125R, 250R and 500R) since the interleaver size changes with the speed. Also, regarding Q15X25, if you can run Linux this may be another option: http://he.fi/pub/ham/unix/linux/ax25/newqpsk/ Regards, John (VK2ETA) --- In digitalradio@yahoogroups.com, Tony <d...@...> wrote: > > > That is realy nice path test. Can you try few other modes, > > some more wide like ALE and Q15X25 ? > > We experimenting a lot with PSK250/500, with or without > > FEC and your path sim. explains us a lot. > > Experiments are on 80m band with NVIS antennas and > > 20-100Km distance. > > 73! Darko 9A3LI > > Darko, > > I'm glad you found the path tests useful. I've tested > several modes for NVIS performance using the path parameters > recommended by the ITU (see below). This simulation > represents a mid-latitude NVIS skywave path (7ms delay) with > significant ground wave interference. > > Please see attached image for the Hellschreiber test sample. > The image reveals how NVIS path delays can effect Hell mode > reception. Let us know how the simulations compare to your > on-air testing and if there's another mode I can run through > the simulator for you. > > Tony -K2MO > > PS: I'm not sure why, but I could not test Q15X25 with Mixw. > I'm not aware of another program available for that mode. >
