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ZL3AI > APRDIG 21.07.06 03:06l 247 Lines 9338 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 25 #18, 1/1
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From: ZL3AI@ZL2BAU.#87.NZL.OC
To : APRDIG@WW
Today's Topics:
1. Re: IGate to APRS-IS data transfer delays (Robert Bruninga)
2. New positioning technologies & maps (John Habbinga)
3. Re: xastir vs. oziexplorer (Curt, WE7U)
4. vehicle laptop mount for APRS rig (Jason Winningham)
5. Re: vehicle laptop mount for APRS rig (Drew Baxter)
6. RE: vehicle laptop mount for APRS rig (John Gleichweit)
7. Re: vehicle laptop mount for APRS rig (Tyler Allison)
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Message: 1
Date: Mon, 17 Jul 2006 13:46:24 -0400
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: Re: [aprssig] IGate to APRS-IS data transfer delays
>>>tim_cunningham_at_mindspring.com 07/17/06 11:27 AM >>>
>This discussion is not for DCD problems it is for what
>the title suggests. DCD delay is a separate problem with digipeaters.
I agree 100% with your assessment and with what you are trying to do. And
I am sorry if I sound like a broken record, but it seems that going and
looking for Igate delays, without figuring out a method to eliminated the
DCD delays from the process first, is trying to battle one set of unknowns
with a known problem mixed in randomly...
It is extremely tedious to look at every case. I guess what I am asking,
is that someone needs to write an algorithm that uses a known set of rules
to try to separate these two problems so that energies are not wasted
jilting at the wrong windmill?
Again, I am only kibitzing, and may have missed a break-through, but
without a tool to separate the two problems, it seems too tedious to do it
by hand. I welcome Tim's suggestions to try to reduce the potential
problem on the IGate side. What are the suggestions for nailing it all
down?
Again, here are the facts as I understand them. Correct me if I am wrong:
1) Delays are seen. These delays could be at DIGIS with DCD problems or
they could be at IGates.
2) The DCD problem has been around over 20 years, is well known, is well
explained, is very very common and is very easy to accidently cause by
wrong setups at the digi
3) There are no known IGate long delay processes other than the seconds or
so inherrent in the internet.
Other than those 3 facts, it seems like jumping the gun to go looking for
IGate delays when it appears to me (could be wrong) that DCD could still be
the problem. ANd I agree, it is very hard to isolate the two... but since
RF DCD delays are so common, and long delays can perfectly be described by
that process, it just seems like we have to find a way to eliminate that
first.
My guess on an algorithm would be the following:
1) Look for all NMEA sentences (time stamped)
2) Compare times of arrival in APRS-IS
3) If a long delay is observed, then go look for other data to corroborate
whether it is a DCD delay or not.
Only thing I can thinkn of is to have to then be lucky enough to get TWO
different stations NMEA through the same digi within the "delay" time.
Either, they are both delayed and come "out" at the same time (though
different going in)...(proving a DCD delay)
Or if you can find one NMEA that is long delayed and another one that got
into-and-out of the same digi within the time period of the first one's
delay. Then and only then, can you prove it was not a DCD delay...
Good luck
Bob
Thanks Bob
------------------------------
Message: 2
Date: Mon, 17 Jul 2006 17:52:51 -0500
From: "John Habbinga" <kc5zrq_at_gmail.com>
Subject: [aprssig] New positioning technologies & maps
I wanted to give everyone a heads-up on a podcast called "The 10 Show" that
is featuring the "Where 2.0 Conference" today. I figured that people
interested in APRS would be interested in these new technologies for
mapping and position reporting.
http://on10.net/Blogs/TheShow/3935/
--
John Habbinga, KC5ZRQ
Lubbock, Texas
http://find-you.com/cgi-bin/find.cgi?call=KC5ZRQ*
------------------------------
Message: 3
Date: Mon, 17 Jul 2006 18:27:53 -0700 (PDT)
From: "Curt, WE7U" <archer_at_eskimo.com>
Subject: Re: [aprssig] xastir vs. oziexplorer
On Sun, 16 Jul 2006, Laidlaw, Andrew wrote:
>I'm looking at using APRS as an addition/supplement to some of my
>activities. After doing some Internet research, it looks as if I
>would be trying to use APRS inside either Xastir or OziExplorer. I
>would like to hear some feedback from people who have experience
>with both programs as to the good and bad points of each program.
>I realize that: Xastir is free, and can be problematic to get
>running initially; OziExplorer and OziAPRS/NETAprs cost money, but
>installs easier.
>I guess I'm looking for feedback dealing more with daily
>operation, program crashes, etc (the after it's up and running phase).
Xastir:
I won't talk much about the ease-of-install, partially because I do it many
times a week because of my developer role, partially because those that do
Unix/Linux installs tend to have no problem with it, those that are used to
Windows installs sometimes have great difficulty. There are several that
breezed through the install too, even though they were coming from the
Windows side to Linux/Unix or installing Xastir on Windows itself.
I will talk about the reliability: We've had several users make it to the
100-day mark and further. I've got three sessions running right now, one
of which has been up for 60+ days (off a filtered firenet feed). My other
two sessions I restart often as the code gets developed and I want to try
the new features. All of the versions I run are the "developmental"
versions as well, I'm not even running the "stable" version.
I'm currently tracking 35,388 stations/objects world-wide on one session
that's hook to a full firenet feed.
Every once in a while one of our users tests Xastir on a 486 laptop, and we
sometimes to tweaks to make sure it still runs ok there. For an RF-only
connection or a very filtered TCP connection this might work, but for more
stations you'll need more memory and probably a bit more CPU. I run a
PP200 w/128MB at home and it keeps up fine.
See the link listed below, then click on "APRS Client Capabilities Chart"
to see what features each of the major clients have. If you have data to
add to the chart, please send it to me.
--
Curt, WE7U. APRS Client Comparisons: 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!"
------------------------------
Message: 4
Date: Tue, 18 Jul 2006 11:13:15 -0500
From: Jason Winningham <jdw_at_eng.uah.edu>
Subject: [aprssig] vehicle laptop mount for APRS rig
Can anyone recommend a vehicle laptop mount?
I find myself going mobile with the laptop more and more, and it's fairly
unmanageable.
I'd also be interested in hearing about success with display mounts,
especially touchscreens, for mobile computing rigs.
-Jason
kg4wsv
------------------------------
Message: 5
Date: Tue, 18 Jul 2006 12:18:57 -0400
From: Drew Baxter <droobie_at_maine.rr.com>
Subject: Re: [aprssig] vehicle laptop mount for APRS rig
I like my Jotto Desk for what it is. They're sometimes cheap to have on
EBay and other places. They have vehicle specific foot mounts for many
vehicles as well.
www.jottodesk.com.
If you want to see one installed then check out
http://home.gwi.net/~droobie/rdfview.jpg. Pretty old photo but it shows
how it goes. In my case I had to bolt right into the firewall where the
transmission is because they didn't make a custom foot. Maybe they do for
my Maxima.. :)
I think RAM Mount makes some laptop trays too. I wouldn't use anything
that doesn't have some sort of locking feature to lock it down to the
platform.
--Droo, K1XVM
------------------------------
Message: 6
Date: Tue, 18 Jul 2006 09:27:32 -0700
From: "John Gleichweit" <smokeybehr_at_sbcglobal.net>
Subject: RE: [aprssig] vehicle laptop mount for APRS rig
There's a lot of cheaply made ones out there, so stick with the ones that
are used by Public Safety agencies. Gamber-Johnson is about the most
popular manufacturer, but there are several out there; you can Google for
them. I'm preparing to add a Toughbook docking station to the radio stack,
and permanently mounting the APRS kit in the truck.
--
John "Smokey Behr" Gleichweit FF1/EMT, CCNA, MCSE
IPN-CAL023 N6FOG UP Fresno Sub MP183.5 ECV1852
List Owner x6, Moderator x4 CA-OES 51-507
------------------------------
Message: 7
Date: Tue, 18 Jul 2006 12:44:07 -0400 (EDT)
From: "Tyler Allison" <tyler_at_allisonhouse.com>
Subject: Re: [aprssig] vehicle laptop mount for APRS rig
>Can anyone recommend a vehicle laptop mount?
>
>I find myself going mobile with the laptop more and more, and it's
>fairly unmanageable.
>
>I'd also be interested in hearing about success with display mounts,
>especially touchscreens, for mobile computing rigs.
I built my own for storm chasing. Depending on the type of car you could
do something similar.
http://www.allisonhouse.com/gallery/main.php?g2_view=core.ShowItem&g2_itemId=361
4
Jotto and Ram are the "standard" for hard mount systems.
-Tyler
------------------------------
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