I have developed kits of sound card interface MX614 based 1200baud
modem. Please check-out details at http://foxdelta.com
Regards/Dinesh Gajjar
Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org
Other areas of interest:
The MixW Reflector :
How does the crest factor relate to the mean power vs the peak power? It
doesn't seem correct to add 3 to that figure to come up with the crest
factor.
Patrick has the peak and mean power for the various modes listed in the
documentation for Multipsk, but I am not clear how to convert them to
See my comments inserted...
Walt/K5YFW
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Wednesday, August 23, 2006 4:54 PM
To: digitalradio@yahoogroups.com
Subject: RE: [digitalradio] Re: PC-ALE Signal Detect Before
Transmitting: An Experiment
### My comments below... Walt/K5YFW
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Wednesday, August 23, 2006 5:31 PM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Re: PC-ALE Signal Detect Before Transmitting: An
Experiment
AA6YQ
Let me know if you find a U.S. distributor. I really would like to purchase a
couple or three of them.
Walt/K5YFW
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Wednesday, August 23, 2006 6:14 PM
To: digitalradio@yahoogroups.com
Subject: Re:
Bonnie,
What radio services are we going to interoperate with? Normally this
would be illegal operation. Even under emergency conditions, you need to
be very careful about transmitting outside the ham bands. Even if the
FCC says it could be legal, it may not be legal under other entities
I'm not sure that we can quantify ARQ vs. broadcast.
One thing which has been over looked is that we think of ARQ as sending a
packet(s) and the receiving station sends an ACK.
If however each packet is numbered and contains a CRC number, then if the
receiving station misses a packet (missing
Rick,
My explanation was for sinusoids not rectangular waves, our radios transmit
sinusoids. You are correct about rectangular waves they would have a crest
factor of 1 in linear terms or voltage terms, and 0B in non-linear or power
terms. Yes MT63 has a crest factor of 13dB. It is very
Hello Rick,
the peak and mean power for the various modes listed in the
In Multipsk, you have the ratio between the average power and the peak power.
The peak power is obtained if you have no band base windowing and if you are
always transmitting one carrier at a given time (RTTY, MFSK16...).
Oh my...you are right about the baud rates of MT63...I was going from memory
and I have the written down.
The only problem with on-the-air testing is that you Never HAVE THE SAME
CONDITIONS and you can do that with a simulator...but then the military always
has a fly-off or shoot-off.
I have
On Thu, 24 Aug 2006 10:09:00 -0500, DuBose Walt Civ AETC CONS/LGCA
[EMAIL PROTECTED] wrote:
Let me know if you find a U.S. distributor. I really would like to purchase a
couple or three of them.
just got some education from an elmer with whom I grew up ... he states that
comment in the IC
Research done by private research firms have addressed this problem.
For medium length messages in the broadcast mode, they suggest heavy FEC. For
longer messages they suggest less FEC and NAKs. For critical messages of any
length they suggest FEC and ACKs.
For many receiving stations, they
Hey Walt. I really enjoyed reading your comments. On the same sheet of
music for sure.
Thanks,
Hank
KI4MF
NN0BBX
_
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
On Behalf Of DuBose Walt Civ AETC CONS/LGCA
Sent: Thursday, August 24, 2006 9:45 AM
To:
*** new AA6YQ comments below
--- In digitalradio@yahoogroups.com, DuBose Walt Civ AETC CONS/LGCA
[EMAIL PROTECTED] wrote:
snip
Walt, what would make an HF-based system constucted by amateurs
invulnerable to cyber-attack?
### If you are NOT connected to the Internet and don't use 100%
I am leaving this group. Too much fighting.
Goodbye de LA5VNA
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
$$$ Comments to comments Hi Hi.
Walt/K5YFW
[EMAIL PROTECTED]
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Thursday, August 24, 2006 12:06 PM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Re: PC-ALE Signal Detect Before Transmitting:
ORIGINAL MESSAGE:
At 10:56 AM 8/24/2006, Steinar Aanesland wrote:
I am leaving this group. Too much fighting.
Goodbye de LA5VNA
REPLY FOLLOWS
This is one of the politest groups around. You need to get out more,
Steinar. :-)
73, Bill W6WRT
Need a Digital mode
I understand that your proposed HF system would be entirely
independent of the internet, Walt. My points are
1. If we could reliably distinguish attack payloads from valid
payloads, we'd already be doing this on the internet -- where its
easier to accomplish given the hierarchical routing
BTW Dave...if I come up to your neck of the woods, I'll take you out to some
place that you can recommend that serves good crab cakes, New England Clam
Chowder and lobster.
See me comments ***
Walt/K5YFW
[EMAIL PROTECTED]
-Original Message-
From: digitalradio@yahoogroups.com
AA6YQ comments
--- In digitalradio@yahoogroups.com, DuBose Walt Civ AETC CONS/LGCA
[EMAIL PROTECTED] wrote:
BTW Dave...if I come up to your neck of the woods, I'll take you out
to some place that you can recommend that serves good crab cakes, New
England Clam Chowder and lobster.
You're on,
On Thu, 24 Aug 2006 11:49:16 -0700, Bill Turner [EMAIL PROTECTED] wrote:
This is one of the politest groups around. You need to get out more,
Steinar. :-)
73, Bill W6WRT
obviously he was not around for the FLAME WARS on both BBS and Fidonet in the
early 80s!!! back when I first started running
If any digital radio software authors here would like to check their
code for vulnerabilities, RATS is available via
https://securesoftware.custhelp.com/cgi-
bin/securesoftware.cfg/php/enduser/doc_serve.php?2=Security
This is a primitive static analysis tool compared to commercial
products
Well, this is one very good, hearty, polite, technical discussion.
73... Jon W1MNK
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
KV9U writes:
If you want to broadcast a message from one to many, then the only
practical alternative is to use a non-ARQ mode, typically with a large
amount of FEC. While this is done on amateur frequencies for sending a
bulletin, calling CQ, and having a roundtable, if your goal is
Chris,
There are several amateur radio to e-mail systems available now and they
all use ARQ.
For sending a shared resource, such as is done all the time on SSTV, the
stations are often using WinDream or Hampal which allow you to send out
replacements for bad segments. It can be time
If messages to N recipients are converted to N messages to 1
recipient, under what circumstances would a message transport layer
require one-to-many transmission?
73,
Dave, AA6YQ
--- In digitalradio@yahoogroups.com, KV9U [EMAIL PROTECTED] wrote:
Chris,
There are several amateur
WELL SAID --- BUT IS ANYONE LISTENING??
BOB, K2CRR
- Original Message -
From: expeditionradio [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Wednesday, August 23, 2006 11:24 PM
Subject: [digitalradio] Open 5066 for HF-based Digital Email, Emergency Data
We have plenty of
In case of a serious disaster as Bonnie mentioned a battery pack wil
not last enough.
I have stand by a HW-8 tranceiver a battery pack (solar powered).
And I use the only digital mode that a human understand without using
technology.
So I'm qrv for months maybe for years.
Hoping there will be an
OhSteinar, toughen up!
This isn't fighting. These are just brothers in a bit of
a family disagreement. OK?
Hang in there. They'll agree to disagree, soon.
PS - If you want to see fighting then just drop me a line,
and I will show you a few links that are written in blood! (HI)
73,
John
The message you cite provides no reference to an amateur
implementation of the 5066 standard in amateur radio. I Googled it,
but the only hits were to commercial manufacturers of milspec
equipment.
We have indeed amassed collection of soundcard digital mode
implementations over the last few
ORIGINAL MESSAGE:
At 05:24 AM 8/24/2006, rws wrote:
Let us put aside our petty squabbling, and not worry about whether any
particular digital method was not invented here by hams. Let us
unite behind a common HF standard and actually achieve interoperable
digital communications
My station is also solar powered...
From: martin beekhuis [EMAIL PROTECTED]
Reply-To: digitalradio@yahoogroups.com
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Re: Open 5066 for HF-based Digital Email, Emergency
Data
Date: Thu, 24 Aug 2006 14:08:27 -
In case of a serious
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