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PA2AGA > HDDIG 20.09.00 23:32l 203 Lines 7291 Bytes #999 (0) @ EU
BID : HD_2000_253B
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Subj: HamDigitalDigest 2000/253B
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From: PA2AGA@PI8HGL.#ZH1.NLD.EU
To : HDDIG@EU
Date: Sun, 17 Sep 00 16:38:43 MET
Message-Id: <hd_2000_253B>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
X-BBS-Msg-Type: B
--------------------+--------------------------------------+
| Rob Janssen pe1chl@amsat.org | WWW: http://www.knoware.nl/users/rob |
| AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+----------------------------------+--------------------------------------+
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Date: Fri, 15 Sep 2000 08:55:08 -0500
From: "Charles Brabham" <n5pvl@swb.net>
Subject: multicast (was internet repeater linking)
I found that a day's worth of packet bulletins took about an hour to
"multicast". This left 23 hours to kill... So they were re-sent at different
times of the day. That's 23 retransmissions of each bulletin per day.
It's been a while since I did that test run, but if I remember correctly,
the transmitter would be keyed-up for several minutes (7-8 I think, but may
be wrong) then it would stop transmitting for one second, then back to the
grindstone again for 7 more minutes. Compare this to a normal 1.2 kb packet
transmission with a PACLEN of 80 or 128, then you start to get an idea of
how much "overhead" is eliminated. This is why it sends bulletins that might
have taken you several hours to recieve in about an hour.
There's no "problem" sending updates... As a matter of fact, that's what you
spend the great majority of your time doing!
Transmit on several bands at once, and recipients should be able to find a
clear signal at just about any time of day.
When I decided to do that test run, I talked to the guys at the ARRL and
FCC. Everybody told me to go right ahead; Nobody told me that there were any
legal issues to worry about. I had made it clear that I would be sending @WW
bulletins only. I heard nothing but encouragement.
W1AW broadcasts information "of interest to Hams" every day.
Who is intertested in developing HF multicast? I am!
I'm also interested in VHF/UHF multicast, for that matter. It looks like it
might be fun.
--
73 DE Charles Brabham, N5PVL
n5pvl@swbell.net
http://home.swbell.net/n5pvl/
------------------------------
Date: Fri, 15 Sep 2000 18:31:24 GMT
From: "Cathryn Mataga" <cathryn@junglevision.com>
Subject: multicast (was internet repeater linking)
"Charles Brabham" <n5pvl@swb.net> wrote in message
news:3Npw5.2933$aY1.207485@nnrp2.sbc.net...
> I found that a day's worth of packet bulletins took about an hour to
> "multicast". This left 23 hours to kill... So they were re-sent at different
> times of the day. That's 23 retransmissions of each bulletin per day.
>
> It's been a while since I did that test run, but if I remember correctly,
> the transmitter would be keyed-up for several minutes (7-8 I think, but may
> be wrong) then it would stop transmitting for one second, then back to the
> grindstone again for 7 more minutes. Compare this to a normal 1.2 kb packet
> transmission with a PACLEN of 80 or 128, then you start to get an idea of
> how much "overhead" is eliminated. This is why it sends bulletins that might
> have taken you several hours to recieve in about an hour.
>
> There's no "problem" sending updates... As a matter of fact, that's what you
> spend the great majority of your time doing!
>
> Transmit on several bands at once, and recipients should be able to find a
> clear signal at just about any time of day.
>
> When I decided to do that test run, I talked to the guys at the ARRL and
> FCC. Everybody told me to go right ahead; Nobody told me that there were any
> legal issues to worry about. I had made it clear that I would be sending @WW
> bulletins only. I heard nothing but encouragement.
>
> W1AW broadcasts information "of interest to Hams" every day.
>
> Who is intertested in developing HF multicast? I am!
>
> I'm also interested in VHF/UHF multicast, for that matter. It looks like it
> might be fun.
>
Yeah, this is an interesting idea. The name 'multicast' is a little confusing
compared to the use of the word in ip. In those terms it's more
like 'broadcast.'
If you're just sending, maybe you could use PSK31. Just
make a program that makes a file with the last day's @WW messages, put
a CRC check on each one, and then update it every hour. On the
transmitter just send it over and over again on PSK31. On the receive
end, you download the stream. Check the CRC's and the one that pass
you send over to mail.in on FBB.
------------------------------
Date: Fri, 15 Sep 2000 19:02:28 -0500
From: "Steve Sampson \(K5OKC\)" <ssampson@nospam.radio-link.net>
Subject: multicast (was internet repeater linking)
"Cathryn Mataga" says:
> If you're just sending, maybe you could use PSK31.
or better yet, PSK63, or PSK125...
I wouldn't send the BBS crap, but maybe peoples current
Ham Radio Web Pages or National Weather Service radr, sat,
etc, for later downloading and viewing (HTML, GIF, JPG, PNG,
etc, etc).
Something useful.
------------------------------
Date: Sat, 16 Sep 2000 03:36:27 -0500
From: "Charles Brabham" <n5pvl@swb.net>
Subject: multicast (was internet repeater linking)
"Steve Sampson (K5OKC)" <ssampson@nospam.radio-link.net> wrote in message
news:ss5e27mph3t22@corp.supernews.com...
> "Cathryn Mataga" says:
>
> > If you're just sending, maybe you could use PSK31.
>
> or better yet, PSK63, or PSK125...
>
> I wouldn't send the BBS crap, but maybe peoples current
> Ham Radio Web Pages or National Weather Service radr, sat,
> etc, for later downloading and viewing (HTML, GIF, JPG, PNG,
> etc, etc).
Typical LandLine Lid "thinking"... "Hey, let's use the Ham digital network
to send stuff you can get easier and faster on the Internet!"
How clever.
The "BBS crap" you disparage is the messages and bulletins that thousands of
HAMS care to exchange with each other. It doesn't come from the Internet; It
comes from your fellow Hams.
No wonder you (as a LandLine Lid) have so much trouble accepting it. ;-)
--
73 DE Charles Brabham, N5PVL
n5pvl@swbell.net
http://home.swbell.net/n5pvl/
------------------------------
Date: Sat, 16 Sep 2000 11:45:40 +0100
From: "Dave deSouza" <g3vfp@btinternet.com>
Subject: New Update For MMTTY Software
Just a quick note guys to say that there is a new release of Mako sans
software for RTTY. It has supporting help files in English which have been
compiled by the help group headed by Jan KX2A.
The software is fantastic, and if you have never tried it give it a whirl.
The file on my download page is for pentium use.
http://www.g3vfp.co.uk
Hope you enjoy it.
Best 73es Dave G3VFP
------------------------------
Date: Sat, 16 Sep 2000 01:02:53 GMT
From: Brian Hemmis <K3USC@att.net>
Subject: packet software opinions wanted
Just purchased a used PK232MBX, came with PCPakratt for Windows version
1.00A. Although it works, I'm sure there's got to be something newer and
better. I'm not a packet geek and just need something simple to use. Use it
99% for Packet Cluster DX spotting. Any suggestions- I run a PC with WIN98.
Thanks in advance. Brian K3USC
------------------------------
Date: Fri, 15 Sep 2000 20:31:14 -0500
From: "Rick Ruhl" <ricker@cssincorp.com>
Subject: packet software opinions wanted
To be continued in digest: hd_2000_253C
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