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ZL3AI > APRDIG 19.05.04 09:31l 290 Lines 10659 Bytes #999 (0) @ WW
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Subj: TAPR Digest, May 04, 2/6
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: APRS Simulation
From: "Robert Bruninga" <bruninga@usna.edu>
Date: Tue, 04 May 2004 08:39:15 -0400
X-Message-Number: 6
>>>"Scott Miller" <scott@opentrac.org> 5/3/04 7:23:00 PM >>>
>There are simulation programs out there for modeling large
>radio networks. It'd be nice if someone out there with
>the expertise and time could set one up as a reasonable
>analog of the APRS network.
There is, and it is included with every version of APRSdos since 1994 or
so. Its called simulate.bas.
It lets you enter the number of stations in your event, Whether the APRSdos
decaying algorithm or the brain-dead constant rate mechanism is used, and
what the default rate is and the time of the simulation.
THen it displays the success rate, and the total number of packets
transmitted.
The APRSdos decaying algorithm always has a higher success rate and uses
about half the number of packets.
de Wb4APR, Bob
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Subject: Now ALE
From: "Sadowski, Allan" <allan.sadowski@ncshp.org>
Date: Tue, 4 May 2004 08:45:24 -0400
X-Message-Number: 7
Absolutely... and skip really isn't the issue...
Of course (as I pull out Fiedler and Farmers book)... Ham freq's aren't
the best freqs to use...
http://www.qsl.net/k5eph/nvis.htm has lots of good into... NVIS and ALE
for APRS... whoo hoo !!!! a real tactical net!
ALOHA
AH6LS
- At this time...not an acceptable concept on ham radio. Don't know if
it would ever work with ham radio. Major changes in thinking would have
to occur to really use ALE and that issue.... being stuck in the
past....well never mind! Not being a sheep, I'd love to have a radio
with ALE. I would like to think this is in our future!! I hope so
anyway.
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Subject: Re: Now ALE
From: "Spider" <spider@rivcom.net>
Date: Tue, 4 May 2004 06:05:40 -0700
X-Message-Number: 8
From: "Sadowski, Allan" <allan.sadowski@ncshp.org>
To: "TAPR APRS Special Interest Group" <aprssig@lists.tapr.org>
Sent: Tuesday, May 04, 2004 5:45 AM
Subject: [aprssig] Now ALE
Absolutely... and skip really isn't the issue...
Of course (as I pull out Fiedler and Farmers book)... Ham freq's aren't
the best freqs to use...
Huh? In the last 6 months, 2 to 12 MHz has been working great within a
300 mile radius from my location. You have to "find" the optimum freq
within that span that is working at the time of need. Without ALE, this
URL helps a bit although I've proved it no so accurate..( last evening) and
I am testing it's worth now. It does get you in the ball park!
http://www.ips.gov.au/Main.php?CatID=6&SecID=4&SecName=North%20America&SubSecID&
=3SubSecName=Ionospheric%20Map
Jim, WA6OFT
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Subject: RE: APRS Simulation
From: "Scott Miller" <scott@3xf.com>
Date: Tue, 4 May 2004 07:09:05 -0700
X-Message-Number: 9
I'm aware of the APRSdos simulator.
I'm talking about an actual network simulator, that models each node and its
behavior, and takes propagation and other RF effects into account.
See http://www.isi.edu/nsnam/ns/.
Scott
N1VG
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Subject: Re: DAMA was mentioned here Flexnet?
From: "Brian Webster" <bwebster@wirelessmapping.com>
Date: Tue, 4 May 2004 10:16:51 -0400
X-Message-Number: 10
Wes,
Here are the flexnet links that I found to be interesting. They were the
ones that I finally learned the benefits of flexnet and figured out it was
some sort of DAMA system. www.northeastflexnet.org , www.uspacket.net. These
two sites have links to other sources as well. The USpacket site has a great
tutorial about how to set up a flexnet client using a soundcard and goes in
to some good detail of the system in understandable terms (for me anyway).
They even show you how to install the soundcard as a network driver to make
it easier to do TCPIP over packet. Maybe that is how we get some smarts on
the aprs network by fooling the software we all use to connecting the packet
networks together with flexnet/tcpip. The other good thing about flexnet is
it's ability to run the kernel under dos on older computers. This could also
be a disadvantage for remote digi sites as there are no stand alone tnc
versions of flexnet. As for things like nodes brodcasts I'm not sure if you
can turn that off on a node site. From the cliet software perspective it may
not do that. I'm still learning about flexnet myself. I bet with the real
brianpower of this group we could get a useable version of flexnet put
together to do these things. Maybe it would take a custom build.
Brian, N2KGC
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Subject: Re: Trimble 6 Channel GPS board, need info please...
From: Doug Bade <dbade@clecom.com>
Date: Tue, 04 May 2004 10:26:31 -0400
X-Message-Number: 11
It sounds like they are SveeSix Modules...
They can be flashed to do NMEA, but not likely they are right now..More
likely TAIP protocol.
I have a manual and docs on them, as well as flash info.
Contact me back direct to continue the discussion.. I will PDF what you
need in the mean time...
Doug KB8GVQ
At 02:36 AM 5/4/2004, Kriss Alan Kliegle wrote:
>Greetings from NH!
>I purchased a few Trimble 6 channel GPS boards at a local Hamfest. Trying
>to find out where to apply power and get data out of it. It has a 8 pin (2
>rows of 4 @ 2mm spacing where it was connected to another circuit board.
>For markings it has the numbers: 39818 on both sides. Unit is 3.25" x 1
>13/16" (8.3cm x 4.7cm)
>.................
>Thank you!
>Kriss KA1GJU
>KA1GJU-3 100% Solar Powered WX Digi in Kensington, NH
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Subject: Multi-2000
From: Robbie - WA9INF <mwrobertson@comcast.net>
Date: Tue, 04 May 2004 09:46:05 -0500
X-Message-Number: 12
Hi again,
Its possible my first request for assistance might have gone unnoticed
with the armchair lawyer discussion, <g>
I am trying to set up this unit on APRS, and it seems I cannot adjust or
find my input audio problem and need a schematic. It is made by
Fukuyama, and is labeled ITC Multi-2000, or FDK Multi-2000
Would certainly appreciate _any_ assistance on finding the schematic.
Thanks,
Robbie
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Subject: Re: DAMA was mentioned here Now ALE
From: "Curt, WE7U" <archer@eskimo.com>
Date: Tue, 4 May 2004 08:04:57 -0700 (PDT)
X-Message-Number: 13
On Tue, 4 May 2004, Sadowski, Allan wrote:
>NVIS and data... with ALE... now we're talking some new technology...
>Given the link margin with NVIS... I don't think 1200 bps APRS can
>work... but maybe PSK31 APRS with NVIS and ALE... now your talking about
>areal tactical solution... that doesn't need digi's (infrastructure) to
>work !!!
If that can be done (eventually) with a relatively cheap system, I'd
be interested in something like that for a direct data link back to
our EOC and 911 folks. That would sure beat relaying via voice
links.
I thought the link margin was better with NVIS, as the path lengths
were quite short. I'll have to study up on ALE, as to me that means
"address latch enable".
--
Curt, WE7U archer at eskimo dot com
Arlington, WA, USA http://www.eskimo.com/~archer
"Lotto: A tax on people who are bad at math." -- unknown
"Windows: Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
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Subject: Re: Trimble 6 Channel GPS board, need info please...
From: "Curt, WE7U" <archer@eskimo.com>
Date: Tue, 4 May 2004 08:08:03 -0700 (PDT)
X-Message-Number: 14
On Tue, 4 May 2004, Doug Bade wrote:
>It sounds like they are SveeSix Modules...
>
>They can be flashed to do NMEA, but not likely they are right now..More
>likely TAIP protocol.
>
>I have a manual and docs on them, as well as flash info.
>
>Contact me back direct to continue the discussion.. I will PDF what you
>need in the mean time...
I have a bit of collected data on those as well. I've flashed them
to NMEA mode and hooked them up to a TinyTrak before.
One thing about them, they need a bit of gain in the amplified
antennas. Just any amplified antenna won't work with them.
Hopefully you got some Trimble antennas to go with them, then you're
all set.
Also, if you hook up a lithium battery to the proper pins, they'll
keep the satellite info between uses. Without that, you'll have
terrible startup times before you get a lock.
--
Curt, WE7U archer at eskimo dot com
Arlington, WA, USA http://www.eskimo.com/~archer
"Lotto: A tax on people who are bad at math." -- unknown
"Windows: Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
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Subject: HF ALE
From: Jack Cavanagh <cjcav@earthlink.net>
Date: Tue, 04 May 2004 11:37:36 -0400
X-Message-Number: 15
There is considerable activity with HF ALE among US Army MARS members at
this time using the sound card software developed by Charles Brain,
G4GUO. Results to date indicate that the sound card method works well
and has demonstrated the ability to communicate with the military
hardware ALE radios.
So as not to break the current thread, here is a point for the
armchair lawyers: ALE does not appear to be allowed under current FCC
rules in the United States. These rules limit digital transmissions to
about 500 Hz. ALE occupies about 2.8 kHz or the width of a voice
channel. MARS operation does not come under FCC juristiction. MARS is
governed by NTIA/DoD regulations.
Now, the mavens at Newington have made the interpretation that the
new digital SSTV is permitted because it is transmitting pictures and
not digital data.
This whole things sounds a lot like the situation back in the early
days of packet when the FCC did not permit transmission of ASCII data.
Does anyone remember the Vancouver protocol? The more advanced thinking
of the Canadian Administration allowed our neighbors to the north to get
a jump on packet.
Here is a thought for HF APRS: Use Pactor FEC. It allows the full
ASCII character set; it is analogous to an unconnected packet; it is has
some error correction and is about 10 times faster than PSK31 including
QPSK31 which has FEC.
Jack/KB4XF/AAT3GZ
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