Nice work!
It looks to me as if there are two needs; long interleave to beat lightning and
impulsive noise, and multitone for on-channel qrm and background noise. How
does MT63 with short interleave look? How about 2K MT63? I suspect a
combination of slower rate and wider bandwidth is going to show up better
overall.
This is without ARQ, of course.
One thing I'm seeing (again) in this discussion is that there's no free lunch!.
Cortland
KA5S/AAR5UT
- Original Message -
From: Tony
To: digitalradio@yahoogroups.com
Cc: Rick
Sent: 9/20/2008 2:11:41 AM
Subject: [digitalradio] Re: Lightning Static Simulations / Propagation
Rick,
Tested a few modes for static crash resistance including the ones you asked
about. The HF simulator does not have a QRN mode, but I think I may have come
up with something that works fairly well - see below.
I don't know enough about ionospheric disturbances to know if you can
only have Doppler (such as polar flutter) without having multipath at the
same time.
I seems reasonable that you might have one or the other
A signal reaching a disturbed region of the F-Layer that returns without
interaction from other layers would seem to qualify.
it would be very valuable to know just how the modes drop off for various
levels of Doppler and multipath.
That could be done. I did something along those lines with JT65 and WSPR. As a
rule-of-thumb, it's best to use multi-tone FSK modes like Olivia and MFSK16 on
paths that are highly disturbed.
More later Rick...
Tony, K2MO
Static Crash Simulation.
MT63 1K
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MT63 500Hz
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