/K5YFW
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 19, 2006 3:04 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] 16QPSK Modulation and Baud
Jose Amador wrote:
Taking adventage of SCS experience, they chose PSK
there.
Walt/K5YFW
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 19, 2006 7:10 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] 16QPSK Modulation and Baud
Walt,
I don't doubt that the source data is 20K/Minute or greater
Packet COULD have been a solution, but had a
modulation format unable to do the job.
As a MultiPSK user, I think that PSK31 is inadequate,
maybe PSKFEC could perform better, but I would try
PAX.
It has some long keying delays I don't like from the
moment you press the ENTER key, but is an
Can you or anyone explain why they need this high speed on HF when even
300 baud is pushing the limit on the higher HF bands?
I think this limit only applies to protocols that do not make use of FEC,
redundancy and
adaptive training. Adaptive training may be the most important element.
73,
-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 19, 2006 7:38 AM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] 16QPSK Modulation and Baud
Can you or anyone explain why they need this high speed on HF when even
300 baud is pushing the limit
Walt- I will agree that this is a desirable capability, and I will agree
that Hams should *Within reason* provide emergency Comms, but I DO NOT see
this scenario as a proper part of Ham service. Especially if it requires
drastic changes in our service constraints.
Really- this is an extreme
I have been looking through the internet to find more information on all
these alphabet soup modems. Here is a very interesting web site that
lists not only the various types of waveform bps rates, but also the S/N
ratio for these modems to work properly. Unfortunately, the baud rate is
never
/K5YFW
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 19, 2006 12:25 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] 16QPSK Modulation and Baud
You are misinterpreting what I was asking. Probably because I did a poor
To: digitalradio@yahoogroups.com
Subject: RE: [digitalradio] 16QPSK Modulation and Baud
Walt- I will agree that this is a desirable capability, and I will agree
that Hams should *Within reason* provide emergency Comms, but I DO NOT see
this scenario as a proper part of Ham service. Especially
--- DuBose Walt Civ AETC CONS/LGCA
[EMAIL PROTECTED] wrote:
Ok Jose and everyone...let's take a poll or have
some SWAGs.
So what do YOU (plural) think is the best modulation
technique to use for a NEW and BETTER HF data mode?
I believe there is no single best mode. Like in
antennas, that
--- Mark Miller [EMAIL PROTECTED] wrote:
Can you or anyone explain why they need this high
speed on HF when even
300 baud is pushing the limit on the higher HF
bands?
On the contrary, it is worse on the LOWER bands.
I think this limit only applies to protocols that do
not make use of
--- DuBose Walt Civ AETC CONS/LGCA
[EMAIL PROTECTED] wrote:
Let me give one incident where high through put
would be most desirable...
When hurricanes hit the Texas Gulf Coast, all but
radio communications can be lost between
Brownsville, Texas to Houston, Texas. The weather
stations
You say A highspeed, error free, robust, realtime, HF data mode is
needed. Why would the radar images have to be digital? It's not
perfect data, but continuously changing. When I view radar and
satellite imagery of storms on my television set, the signal I receive
isn't digital, and it
MIL-STD 188-141 http://tracebase.nmsu.edu/hf/standards/MIL/141Bn1.pdf .
MIL-STD 188-110 http://tracebase.nmsu.edu/hf/standards/MIL/188-110B.pdf
Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org
Other areas of interest:
The MixW Reflector :
--- KV9U [EMAIL PROTECTED] wrote:
You are misinterpreting what I was asking. Probably
because I did a poor
explanation.
What I am asking, and no one seems to confirm, is
whether or not the MIL
or STANAG modems really are running at multi
thousand baud rates on HF
frequencies, or
:[EMAIL PROTECTED]
Sent: Tuesday, September 19, 2006 2:37 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] 16QPSK Modulation and Baud
You say A highspeed, error free, robust, realtime, HF data mode is
needed. Why would the radar images have to be digital? It's not
perfect data
Jose Amador wrote:
Taking adventage of SCS experience, they chose PSK
(cannot tell by heart if differential or not, a peek
to the manual is needed) as a modem, and depending on
the retry rate (closely related to BER) it tries more
complex constellations and more carriers. One of the
secrets
Walt,
I don't doubt that the source data is 20K/Minute or greater, what I
question is whether or not sending the 'source' is necessary? It seems
to me that you are asking us to find ways to solve a problem, it often
helps to step back and look at the problem and ask questions. I make my
what is desired...near
realtime data can prevent the loss of many lives.
Walt/K5YFW
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 19, 2006 12:14 PM
To: digitalradio@yahoogroups.com
Subject: RE: [digitalradio] 16QPSK Modulation
--- KV9U [EMAIL PROTECTED] wrote:
Walt,
Maybe someone can clear this up, but what is the
difference between the
differential modes such as DBPSK, DQPSK, 8DPSK, and
16DPSK such as used
with Pactor 2 and modes such as 8QPSK, 16QPSK?
Even when theory says that differential modes have a
-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Monday, September 18, 2006 8:28 AM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] 16QPSK Modulation and Baud
--- KV9U [EMAIL PROTECTED] wrote:
Walt,
Maybe someone can clear this up, but what is the
difference
Thanks for your comments, Jose, however, I think most of us understand
and agree with what you say.
What I am not clear on is the difference betwee the differential
versions of the PSK modes and the non-differential versions. For
example, my understanding is that PSK31 is really DBPSK31. I
--- DuBose Walt Civ AETC CONS/LGCA
[EMAIL PROTECTED] wrote:
Greeings All,
How hard is it to demodulate a 16QPSK as compaired
to a 8QPSK signal.
Demodulation...I think it is about the same. Carrier
regeneration is a bit more complex. Decoding it is
something else, but also doable.
And I
Walt,
Maybe someone can clear this up, but what is the difference between the
differential modes such as DBPSK, DQPSK, 8DPSK, and 16DPSK such as used
with Pactor 2 and modes such as 8QPSK, 16QPSK?
With the former, it is my understanding that with a single tone, the
binary form (DBPSK) gives
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