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PA2AGA > HDDIG 20.09.00 23:35l 208 Lines 7329 Bytes #999 (0) @ EU
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From: PA2AGA@PI8HGL.#ZH1.NLD.EU
To : HDDIG@EU
Date: Sun, 17 Sep 00 16:38:41 MET
Message-Id: <hd_2000_253A>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
X-BBS-Msg-Type: B
Ham-Digital Digest Sat, 16 Sep 2000 Volume 2000 : Issue 253
Today's Topics:
FS: PK-96 TNC
HF multicast (2 msgs)
Interfaces-question
internet repeater linking (2 msgs)
multicast (was internet repeater linking) (4 msgs)
New Update For MMTTY Software
packet software opinions wanted (3 msgs)
TCP/IP Address (13 msgs)
WTB: Windows software for an SCS PTC-IIe TNC
Send Replies or notes for publication to: <Ham-Digital@UCSD.Edu>
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Archives of past issues of the Ham-Digital Digest are available
(by FTP only) from ftp.UCSD.Edu in directory "mailarchives/ham-digital".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
Loop-Detect: Ham-Digital:2000/253
----------------------------------------------------------------------
Date: Fri, 15 Sep 2000 20:10:06 -0400
From: ZZZjim_cronin@juno.comZZZ
Subject: FS: PK-96 TNC
For sale: AEA PK-96 dual speed TNC.
Does 1200 and 9600 baud on the same radio.
$140 shipped to lower 48. For more info send email to
ZZZjim_cronin@juno.comZZZ (remove leading and trailing ZZZ).
Thanks and 73,
Jim
N2VNO
------------------------------
Date: Fri, 15 Sep 2000 19:42:19 GMT
From: "Hank Oredson" <horedson@att.net>
Subject: HF multicast
"Charles Brabham" <n5pvl@swb.net> wrote in message
news:3Npw5.2933$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!
As I recall from the earlier discussions, there didn't seem to be
much interest. If a few stations would sign up for testing and
deployment, it might be fun to do the protocol over CLOVER FEC.
That protocol would seem to be a natural.
> I'm also interested in VHF/UHF multicast, for that matter. It looks like it
> might be fun.
Where is the spec for the multicast protocol used on the pacsats?
Looked at it a long time ago, and remember that nobody seemed
interested in adapting it to other uses.
I never see any traffic actually arrive via the pacsat links, except for an
occasional personal message. Do they handle bulletins anymore?
--
... Hank
http://horedson.home.att.net
------------------------------
Date: Sat, 16 Sep 2000 08:35:17 GMT
From: nomail@rob.knoware.nl (Rob Janssen)
Subject: HF multicast
Hank Oredson <horedson@att.net> wrote:
>Where is the spec for the multicast protocol used on the pacsats?
>Looked at it a long time ago, and remember that nobody seemed
>interested in adapting it to other uses.
The spec is in the proceedings of the 9th CNC (1990), but there have been
later mods and extensions that were distributed via the satellites as
files. Hopefully they can now be found on the web somewhere. If not,
ask Jeff Ward, K8KA.
There have been at least two implementations of a broadcasting station (I
have experimented with one from Japan), and one broadcasting the content of
an F6FBB BBS "on-the-ground". I don't know if these went beyond the stage
of experiments.
The current German BBS program from the Baycom group should also support
it.
Rob
--
+----------------------------------+--------------------------------------+
| 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 |
+----------------------------------+--------------------------------------+
------------------------------
Date: Fri, 15 Sep 2000 12:27:01 GMT
From: ydussaul@total.net (Yves Dussault)
Subject: Interfaces-question
Has anybody bought an interface kit from BUXCommCo?
Satisfied?
VE2ATD Yves
------------------------------
Date: Fri, 15 Sep 2000 19:16:45 GMT
From: "Hank Oredson" <horedson@att.net>
Subject: internet repeater linking
"Rob Janssen" <nomail@rob.knoware.nl> wrote in message
news:slrn8s3lto.qs.nomail@linux.pe1chl.ampr.org...
> >This topic was done to death about 5-6 years ago. Several robust
> >"request fill" protocols were proposed, none were tested.
>
> Wrong. The protocols were designed, implemented and tested and have
> been in use for over a decade now. On packet satellites.
Yes, I'm aware of those protocols.
I understood the topic to be HF protocols, my mistake.
--
... Hank
http://horedson.home.att.net
------------------------------
Date: Sat, 16 Sep 2000 08:37:12 GMT
From: nomail@rob.knoware.nl (Rob Janssen)
Subject: internet repeater linking
Hank Oredson <horedson@att.net> wrote:
>"Rob Janssen" <nomail@rob.knoware.nl> wrote in message
>news:slrn8s3lto.qs.nomail@linux.pe1chl.ampr.org...
>> >This topic was done to death about 5-6 years ago. Several robust
>> >"request fill" protocols were proposed, none were tested.
>> Wrong. The protocols were designed, implemented and tested and have
>> been in use for over a decade now. On packet satellites.
>Yes, I'm aware of those protocols.
>I understood the topic to be HF protocols, my mistake.
Actually the pacsat broadcast protocols are not very tightly coupled to
AX.25 as a transmission protocol. Any protocol that can transmit delimited
datagrams could be used as a layer below them.
Rob
--
+----------------------------------+--------------------------------------+
| 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 |
+----------------------------------+--------------------------------------+
To be continued in digest: hd_2000_253B
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