Another contest...
S
Andrew O'Brien wrote:
The Makrothen Contest
TMC - The Rules - 2008
Last Update: 4-October-2008
TMC logo
Date and Time:
The contest takes place on the second full weekend of October each
year. The next contest dates are Saturday 11th and Sunday 12th
Hello Tony,
According to my measures (under noise only):
* 16-1K: Fast 16 tones, bandwidth=1000 Hz, speed=62.5 bauds, 78.2 wpm,
lowest S/N =-9 dB,
* MT63 1K: 100 wpm, lowest S/N - 5 dB for 10 bauds (perhaps -7dB with the
original program) but due to the
Pmean/Ppeak: 0.1, it is only
Vojtech and Patrick thanks you for the reply. I effectively didn't
realize synchronization was so critical too. Interesting.
Just a comment/question to both, since you are both developers of
widely used programs (and I take this opportunity to thank you both
for that), I discovered the THOR mode
-- Forwarded message --
From: Colin J Thomson [EMAIL PROTECTED]
Date: Sat, Oct 11, 2008 at 6:30 AM
Subject: [Knightsqrss] A proposal..
To: Knights-List [EMAIL PROTECTED]
Hi Graphical Knights..
A proposal.. although a little too late now I think.
With the ever increasing QRO IE
Hello John,
As far as I know, there are no public specifications or description of THOR
modes.
73
Patrick
- Original Message -
From: vk2eta [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Saturday, October 11, 2008 12:01 PM
Subject: [digitalradio] Re: Sound card question
Patrick, John,
This is all we have published at the moment. More will be released at a later
date. We are busy with the launch of NBEMS and have no time right now to write
detailed specifications.
http://w1hkj.com/FldigiHelp/Thor.html
73, Skip KH6TY
NBEMS Development Team
- Original
Patrick, John,
The link on the Thor web page, http://w1hkj.com/FldigiHelp/Thor.html,
provides some additional technical specifications for Thor:
http://w1hkj.com/FldigiHelp/Modes/THORdesc.htm
To answer John's question, Thor uses full time FEC.
73, Skip KH6TY
NBEMS Development Team
Hi Tony.
Even though the simulation results look promising for MT63, they do
not take real HAM SSB transceiver into account. SSB PA of an average
HAM TRX is usually not very linear and the many carriers of MT63 will
mix with each other, which will show up as an added noise. Also MT63
has very low
There is a basic outline of THOR at:
http://www.w1hkj.com/FldigiHelp/Modes/THORdesc.htm
Perhaps someone can help us understand the difference between THOR and
DEX/FEC (Domino EX with FEC). Aren't they very much the same concept, or
is there a design difference?
73,
Rick, KV9U
Patrick
-Original Message-
From: Hans Zimmermann [mailto:[EMAIL PROTECTED]
Sent: Friday, October 10, 2008 05:33
To: [EMAIL PROTECTED]
Subject: GlobalSET - November 2008
To all participants of GAREC-05-06-07-08:
The next GlobalSET has been announced for 8 November 2008. Below please find
the
Hello Skip,
TKS for the information.
I read the specifications. It seems to be a DominoEX with a MFSK16 interleaver
(in the FEC DominoEx, in accord with Murray Greenman, I had reduced it as it
seemed to me that the delay was a bit long).
Do you confirm that it is the only difference?
If so,
Hello Vojtech and Tony,
has very low crest factor, so the effective transmitted power will be
An example, with a 100 watts HF transceiver, keeping linear:
* you can transmit 10 watts of MT63,
* you can transmit 76 watts of Contestia.
73
Patrick
- Original Message -
From: Vojtech
Just this morning I came across a net running in Olivia 8-tone/1000Hz.
It decoded poorly in one SW package, better in another, and best of
all in a third. I think this must be due to the decoding algorithms
of the software packages, as I get different rankings in other modes.
Cortland
KA5S
Patrick,
I get the same minimum SNR for Contestia but can squeeze -8db out of MT63 when
using DM780 and IZ8BLY. Some MT63 programs have a higher decode threshold for
reasons you've mentioned previously.
The threshold difference shows on-air as well as under controlled conditions
and so it
Nope - the code is almost the same - it'll be soundcard calibration issues.
Simon Brown, HB9DRV
www.ham-radio-deluxe.com
- Original Message -
From: Cortland [EMAIL PROTECTED]
Just this morning I came across a net running in Olivia 8-tone/1000Hz.
It decoded poorly in one SW package,
The following is an excerpt from the web page Sights and Sounds of
Digital Signals, http://www.w1hkj.com/FldigiHelp/Modes/index.htm.
THOR Modes
General Description
THOR is a family of offset incremental
The following is an excerpt from the web page Sights and Sounds of
Digital Signals, http://www.w1hkj.com/FldigiHelp/Modes/index.htm.
THOR Modes
General Description
THOR is a family of offset incremental multi-frequency shift keyed
modes with low symbol rate, closely related to DominoEX. A
TKS Tony for the information,
I've tested this theory by removing short 1-to-3 second segments of the signal
at random intervals and the mode continues to print despite the missing
'chunks'.
Yes MT63 has a good frequency and time diversity. And at 100 wpm, there are no
many modes...
A
Great information, Dave,
On other thing that I can not understand is why THOR's performance
proved to be so poor on Tony's tests. The robustness to multipath and
Doppler does not seem to show up although sensitivity at -15 dB SNR
seems quite good.
It might be understandable with the more
Hello Cortland,
Yes this is due to different sound card speeds. With a perfect sound card
speed for each application, the decodings are very similar.
Olivia is very sensitive to soundcard speed accuracy, not as much as MT63
but...
73
Patrick
- Original Message -
From: Simon Brown
I thought that might be the case, but having calibrated the sound card
clock in each of the three packages MultiPSK, fldigi and MixW, the
differences persist.I may try a better sound card.
Cortland
KA5S
[Original Message]
From: Simon Brown \(KNS\) [EMAIL PROTECTED]
To:
Tony wrote:
Patrick,
I get the same minimum SNR for Contestia but can squeeze -8db out of
MT63 when using DM780 and IZ8BLY.
Yesterday I had no luck with DM780 while monitoring Tony's QSO's on
14106. Of course, I have not calibrated DM780, so that is no surprise.
Propagation was not
http://www.arrl.org/news/features/2008/10/10/10380/
Surfin': More Going ATV Digitally
By Stan Horzepa, WA1LOU
Contributing Editor
October 10, 2008
This week's Surfin' again considers Web sites related to Amateur Television
(ATV) going digital.
I had good intentions for the last GAREC SET and had even announced this
at our county wide amateur radio club, however, I managed to completely
slip up remembering and hope to do better this time around. Are any of
you digital operators planning to participate, especially if using CW or
24 matches
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