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ZL3AI > APRDIG 20.09.03 10:15l 147 Lines 4619 Bytes #999 (0) @ WW
BID : 1960-ZL3AI
Read: GUEST
Subj: TAPR Digest, Sep 17, 7/7
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Sent: 030919/1413Z @:ZL3VML.#80.NZL.OC #:8668 [Chch-NZ] FBB7.00i $:1960-ZL3AI
From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: Digi Range Experiment
From: "Spider" <spider@rivcom.net>
Date: Wed, 17 Sep 2003 16:10:52 -0700
X-Message-Number: 50
>A digi with a range of 124 miles is "full" in under 30 miles...
>
>I'd suggest that this is one way to show a digi is "too good"
>for the network.
>
>73,
>Bill - WA7NWP
Hi Bill!
I had to laugh! Tell that to a Ham that has free space on a 9000'
mountaintop! Actually, I could give you the callsigns of a few hams you
could tell this too!
Jim, WA6OFT
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Subject: Re: Digi Range Experiment
From: "Bill Vodall - WA7NWP" <wa7nwp@jnos.org>
Date: Wed, 17 Sep 2003 17:50:14 -0700
X-Message-Number: 51
>>A digi with a range of 124 miles is "full" in under 30 miles...
>>
>>I'd suggest that this is one way to show a digi is "too good"
>>for the network.
>
>Tell that to a Ham that has free space on a 9000'
>mountaintop! Actually, I could give you the callsigns of a few hams you
>could tell this too!
>
>Jim, WA6OFT
The old ideas of 10 years ago that helped sink legacy connected mode packet
are still alive. Higher is not better for digital. For a given
technology (1200 baud AFSK) only so many stations can share the channel.
With some theory and handwaving, 50 was chosen as a good enough number of
stations.
A digi on a 9000' peak would be great for a sparsely populated area like
Montana without 50 APRS hams in the whole state. It's totally
counter-productive in a busy area like Western Washington and, I'm
guessing, Southern California.
There are so many other opportunities for a 9000' mountain top it's sad to
see it misused on 144.39.
73,
Bill - WA7NWP
PS. Here's my report of Western Washington digi's and the stations, and
digis, they hear direct as indicated by callsign substitution of the first
"RELAY" or "WIDE" path member.
http://www.jnos.org/javAPRS/tnc/digisummary.txt
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Subject: sar/aprs software
From: Kevin Deckert <kdeckert@mercuryspeed.com>
Date: Tue, 16 Sep 2003 22:52:49 -0700
X-Message-Number: 52
Could any of you magic software developers...put something in the APRS
program that will show where the missing person is. That would save a
great deal of hassle for everyone!!! lol
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Subject: RE: Re: Digi Range Experiment
From: "Scott Miller" <scott@home.miller.org>
Date: Wed, 17 Sep 2003 18:15:28 -0700
X-Message-Number: 53
On the other hand, a few high sites ought to be idea for a high-speed
backbone. Has anyone put much work into analysis of an APRS backbone
architecture? I know there's been discussion of protocols, and OpenTRAC is
being designed with backbones in mind, but that only addresses the language
and not the topology of the network.
I'll have to dig up some of the papers I found on the Army's research into
MANETs. Their analysis of broadcast protocols was particularly interesting.
Maybe if I get some time I'll skim through the material and write up a quick
summary for the PSR or something.
Scott
N1VG
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Subject: RE: sar/aprs software
From: "Scott Miller" <scott@home.miller.org>
Date: Wed, 17 Sep 2003 18:18:25 -0700
X-Message-Number: 54
The key is having the foresight to put a tracker on the subject BEFORE they
get lost. =]
Actually, with some 'repeat customers', it's been done...
Again, everyone needs to review the 12-codes at
http://comspark.com/esarc/funcodes.htm. To wit:
12-03 Have found subject. Please advise us of our location.
12-07 Subject has obviously never been within 100 miles of this &^%$# place.
12-21 If I knew where I was, I wouldn't need you to bring me a map, would I?
And my favorite, from repeated personal experience:
12-19 Sure, this photocopied, enlarged, scanned, and faxed driver's
license picture is perfectly clear.
Scott
N1VG
----------------------------------------------------------------------
Subject: Book recommendations
From: "Scott Miller" <scott@home.miller.org>
Date: Wed, 17 Sep 2003 18:24:14 -0700
X-Message-Number: 55
I just came across this book on Amazon... 'Ad Hoc Mobile Wireless Networks:
Protocols and Systems.' Looks good, but I'm not sure if I want to shell out
$xx for a copy. Anyone read this?
Any other reading recommendations on the subject?
The Amazon link is
http://www.amazon.com/exec/obidos/tg/detail/-/0130078174/ref=lib_rd_btb/002-
6945280-0124064?v=glance&s=books
Scott
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