I have been testing MT63 heavily for quite some time for use with psmail, but
PSK63 outperforms it,
so I am back with PSK63.
The biggest drawback (let alone the 2kHz bandwidth required) is the time it
needs to gain sync.
MT63 could have a life where larger blocks are sent (e.g. for PSKftp)
PSKmail also supports APRS messaging and Posit beaconing.
73,
Rein PA0R
-Ursprüngliche Nachricht-
Von: digitalradio@yahoogroups.com
Gesendet: 08.09.06 05:38:18
An: digitalradio@yahoogroups.com
Betreff: [digitalradio] Re: ARQ sound card modes
If I understood its description
--- DuBose Walt Civ AETC CONS/LGCA
[EMAIL PROTECTED] wrote:
Jose,
Are there really more multi-path signals on 40M and
80M than 20M?
I've never looked at signals on 80/40/20 from that
aspect.
73,
Walt/K5YFW
Well, maybe I am blaming the butler, as in mistery
novels, and it is not
Walt,
Aren't these some of Bob, N4HY's comments and what he was experimenting
with at the time? At one time TAPR seemed to be one of the best sources
of information and experimentation with new digital modes, especially on
HF. The impression that I got was that things did not progress further
My measurements on 10 Mhz show that MT63 has 20% less errors than PSK63 on
the same channel.
The is not enough to offset the negative points.
Very interesting. It would seem that MT63 would better remain a broadcast
mode like Amtor Mode B or PACTOR FEC.
73,
Mark N5RFX
Need a Digital
--- KV9U [EMAIL PROTECTED] wrote:
Hola Jose,
I think that Paul, K9PS attempted to do this at one
time, but was not
able to finish it. He has developed ARQ criteria
that was the used to
help develop PSKmail. I thought that MT-63 could
handle multi-path quite
well, but I still prefer
--- In digitalradio@yahoogroups.com, kf8zn [EMAIL PROTECTED] wrote:
QUESTION: How does MMTTY compare head to head with a TNC, such as the
DXP-38 for instance ??
There really are two questions, MMTTY compared with a DSP TNC like the
DXP-38 and compared with an all-hardware TNC like the PK-232
--- Dave Bernstein [EMAIL PROTECTED] wrote:
Open source is one solution. Another is to establish
and maintain a
repository containing source code and all necessary
development
tooling; this repository should be placed in the
hands of a trusted
individual or group with instructions for
anyone?
Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org
Other areas of interest:
The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/
DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion)
Yahoo! Groups Links
* To visit your group on
What I should have said is if your application is developed open
source, then have addressed this issue. Transitioning from closed to
open source solely to address longterm continuity would rarely make
sense, IMHO.
Effective open source projects require a significant management
effort.
Very important information, Rein, and thank you for sharing it with the
group. This is the kind of real world information we need to hear.
Considering the enormous amount of bandwidth MT-63 takes up, it would
have to work several times faster and better than a narrow band mode to
At 05:46 8/9/2006 -0700, you wrote:
DO KNOW that ISI is far more severe on 40 than on 20.
I have found that the higher you go on frequency, the
lower the ISI tends to be and TNC's used to behave
better.
Yes, Jose is right. A very good proof is the quality
of HF FAX signals, where multipath
EUROPEAN AMPLITUDE MODULATION AMATEUR RADIO GROUP
NEW YAHOO GROUP: http://groups.yahoo.com/group/eamarg/
This is a group for licenced amateur radio operators (HAMs) who are
interested in the AMPLITUDE MODULATION (AM) mode of communications.
The group exists to promote the AM operation in the HAM
The reason that Clover died out is that HAL decided to keep it
proprietary. At least the early SCS Pactor mode was implemented with
varying degrees of success on hardware from different vendors, e.g.,
Kantronics and AEA. Even HAL tried to implement it on their P-38 card
but it never worked
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