Hi Rick,
You obviously do not use MT-63 to pass book traffic on a daily basis
on NVIS paths, fore if you did your opinion would be completely
different and if you don't believe me, just ask any MARS member that
is using a Sound Card based system these days and they will tell you
just how
I think that for the speed, MT-63 can be OK. But not that great with
difficult conditions. A lot of modes will work find with good paths. I
suspect that they have reasonably strong signals. MT-63 just does not
reach down into the noise as some other modes and I have tested it many
times under
Hi Tony,
Too bad you did not also run MT-63 at all three
modes for comparison. I can tell you that next to
the various 75bps Robust mode on the
MIL-STD-188-110/STANAG modem, its very robust.
However under such conditions nothing but an ARQ protocol will really suffice.
/s/ Steve, N2CKH
At
if it
was an SNR issue, but still no copy.
Tony - K2MO
- Original Message -
From: Steve Hajducek [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Saturday, October 27, 2007 1:37 PM
Subject: Re: [digitalradio] Digital Propagation Tests
Hi Tony,
Too bad you did not also run MT-63
Real attempts on 40 meters have had the same results for me.
On 20 it works far better, almost perfect..
MT63 is robust but too slow, and waving the carpet leaves it dizzy.
Being too slow, even slow doppler has a too high impact on it.
Jose, CO2JA
---
Tony escribió:
Hi Steve,
Too bad
Steve,
If MT-63 is robust relative to MIL-STD-188-110, then the latter may not
be all that robust! I do not find MT-63 to be all that robust, and it is
not as sensitive as other modes since it does not work well into the noise.
Do you have any real world amateur tests yet on the
All,
For what it's worth, I ran several digital modes through a high-latitude
ionospheric path simulator and recorded the results. The signal spread
was set to 30Hz and path delay was 7 milliseconds. With these settings,
the audio sounds much llike the most extreme polar path distortion and
