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ZL3AI > APRDIG 22.07.06 01:20l 259 Lines 9057 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 25 #19, 1/4
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From: ZL3AI@ZL2BAU.#87.NZL.OC
To : APRDIG@WW
Today's Topics:
1. RE: vehicle laptop mount for APRS rig (Tim Smith)
2. Re: IGate to APRS-IS data transfer delays (mconner_at_aer.com)
3. RE: vehicle laptop mount for APRS rig (Brian Webster)
4. Re: vehicle laptop mount for APRS rig (Randall Zabel)
5. vehicle laptop mount for APRS rig (Jim Lux)
6. Re: vehicle laptop mount for APRS rig (Jason Winningham)
7. Re: vehicle laptop mount for APRS rig (John Habbinga)
8. Re: vehicle laptop mount for APRS rig (David Odom)
9. Re: Re: IGate to APRS-IS data transfer delays (Robert Bruninga)
10. RE: Re: IGate to APRS-IS data transfer delays (AE5PL Lists)
11. Re: vehicle laptop mount for APRS rig (Joel Maslak)
12. RE: vehicle laptop mount for APRS rig (Andrew Rich)
13. RE: vehicle laptop mount for APRS rig (Drew Baxter)
14. Re: vehicle laptop mount for APRS rig (John Habbinga)
15. Re: vehicle laptop mount for APRS rig (Drew Baxter)
16. Re: IGate to APRS-IS data transfer delays (Tim Cunningham)
17. Re: IGate to APRS-IS data transfer delays (Ben Jackson)
18. Re: Laptop Stand (kd4ydc_at_juno.com)
19. Re: IGate to APRS-IS data transfer delays (Tim Cunningham)
20. EVDO to 802.11g dilemma (Mark Fellhauer)
21. RE: vehicle laptop mount for APRS rig (Nick Kotch)
22. Re: Re: Laptop Stand (Chris Rose)
23. Re: vehicle laptop mount for APRS rig (Jason Winningham)
24. Re: vehicle laptop mount for APRS rig (Jan T. Pharo)
25. Re: vehicle laptop mount for APRS rig (Jan T. Pharo)
26. RE: Re: IGate to APRS-IS data transfer delays (Curt, WE7U)
27. Re: vehicle laptop mount for APRS rig (Curt, WE7U)
28. Re: vehicle laptop mount for APRS rig (John Habbinga)
29. Re: vehicle laptop mount for APRS rig (Doug Ferrell)
30. Jotto Desk for Jeep (Michael J. Wolthuis)
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Message: 1
Date: Tue, 18 Jul 2006 10:08:53 -0700 (PDT)
From: Tim Smith <rt_smith_at_yahoo.com>
Subject: RE: [aprssig] vehicle laptop mount for APRS rig
There are a number of homebrew projects on the web for sturdy laptop
mounts without having to spend an arm and a leg. Plumbers specials are
popular.
See
http://www.makezine.com/blog/archive/2006/04/homemade_unimount_laptop_mount.htmc
l#omments
73,
Tim
--- John Gleichweit <smokeybehr_at_sbcglobal.net> wrote:
>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: 2
Date: Tue, 18 Jul 2006 12:16:03 -0500
From: mconner_at_aer.com
Subject: [aprssig] Re: IGate to APRS-IS data transfer delays
Bob WB4APR wrote:
>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.
It has already been established that non-RF delays are occurring. I've
seen several instances of direct reception of the same packet by two IGates
- one IGate will pass the data with <3 seconds delay, the other will have a
delay of a minute or more. This is not to say RF delays aren't occurring,
but that non-RF delays definitely are.
In addition to NMEA time stamps, TinyTraks sending hour/minute/sec time
information are also useful.
73 de Mark N9XTN
------------------------------
Message: 3
Date: Tue, 18 Jul 2006 13:31:50 -0400
From: "Brian Webster" <bwebster_at_wirelessmapping.com>
Subject: RE: [aprssig] vehicle laptop mount for APRS rig
Just make sure you look up on line the airbag deployment zone in your
vehicle if it has one. Most of the commercial solutions have this figured in
to the design. You do not want your laptop and mount to block the airbag
from working or worse yet have the airbag deploy and make the laptop and
mount be part of a missile because it got launched by the force of the
airbag. People get hurt by their hands hitting them from airbag deployments,
imagine a laptop lid or metal from the mount.....
Thank You,
Brian N2KGC
------------------------------
Message: 4
Date: Tue, 18 Jul 2006 13:45:14 -0500
From: Randall Zabel <Zabel_at_aps.anl.gov>
Subject: [aprssig] Re: vehicle laptop mount for APRS rig
I bought a jotto desk and it is one of my best investments.
2002 Ford Expedition
Randy, N9NWA
------------------------------
Message: 5
Date: Tue, 18 Jul 2006 12:00:18 -0700
From: Jim Lux <jimlux_at_earthlink.net>
Subject: [aprssig] vehicle laptop mount for APRS rig
Aside from the mechanical and power aspects, you also need to consider
thermal effects. Most notebook computers are desigend to be operated in an
"office environment", meaning not too far from 20C. Put it in a car at 0C
or 40C, and things might not work out too well. In lots of places, it's
pretty easy to get the interior temperature of the car up above 50C (122F),
and if the sun is shining on the case, it will get even hotter.
A panasonic toughbook has been tested for -20 to 140F operational, -60 to
160F non-op
A macbook is specified to operate at 35C.
Sony Vaios say Operating range: 0 to 35C (32 to 95F)
Dells are speced at 0 to 40C..
And, although it may say you can run that hot, bear in mind that the
expected life is roughly halved for every 10C
Jim Lux, W6RMK
------------------------------
Message: 6
Date: Tue, 18 Jul 2006 14:14:47 -0500
From: Jason Winningham <jdw_at_eng.uah.edu>
Subject: Re: [aprssig] vehicle laptop mount for APRS rig
On Jul 18, 2006, at 2:00 PM, Jim Lux wrote:
>Aside from the mechanical and power aspects, you also need to consider
>thermal effects.
Yep. My application would be occasional use, and the vehicle would be
running pretty much 100% of the time the computer is in operation.
If it were installed permanently, I think it would be a close race to
see what killed it first: vibration or thermal stress.
>In lots of places, it's pretty easy to get the interior temperature of
>the car up above 50C (122F),
it's almost that hot outside today. (:
-Jason
kg4wsv
------------------------------
Message: 7
Date: Tue, 18 Jul 2006 14:27:46 -0500
From: "John Habbinga" <kc5zrq_at_gmail.com>
Subject: Re: [aprssig] vehicle laptop mount for APRS rig
If there will be no one riding in the passenger seat, then there is a
solution that is very cheap. At Office Depot if found a computer support
that is similar to a pillow with a board on top. The pillow covering is
velor and the top has some sort of leather like material glued to the top
of it.
You place it in the passenger seat and the velor covered pillow supports it
firmly. Since the top is flat it lets the computer stay ventilated and
cool. I'm not sure these are sold as computer holders, but rather portable
desk space for writing.
There are photos of something similar to what I have at
http://www.levenger.com/Pagetemplates/Product/MorePhotos.asp but mine has a
padded lip at the bottom instead of a elastic bands to keep stuff from
sliding off and no handle. Definitely not a permanent solution, but good
on trips if you don't have a passenger and you don't have to stare at the
computer while your driving.
------------------------------
Message: 8
Date: Tue, 18 Jul 2006 15:33:50 -0400
From: "David Odom" <dodom_at_mindspring.com>
Subject: Re: [aprssig] vehicle laptop mount for APRS rig
A great home built mobile lap top stand is shown on Stephen Smiths web site
at wa8lmf dot com.
Dave
W4VOR
------------------------------
Message: 9
Date: Tue, 18 Jul 2006 16:26:11 -0400
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: Re: [aprssig] Re: IGate to APRS-IS data transfer delays
Thanks,
I was not aware of those instances. So thanks for claraifying.
So, has anyone clarified what each IGate does when it suffers a lost
connection and then attempts to re-establish the connection? Does it
buffer packets until recoenected, or drop them on the floor?
bob
------------------------------
Message: 10
Date: Tue, 18 Jul 2006 15:56:56 -0500
From: "AE5PL Lists" <HamLists_at_ametx.com>
Subject: RE: [aprssig] Re: IGate to APRS-IS data transfer delays
>-----Original Message-----
>From: Robert Bruninga
>
>So, has anyone clarified what each IGate does when it suffers
>a lost connection and then attempts to re-establish the
>connection? Does it buffer packets until recoenected, or
>drop them on the floor?
It is supposed to "drop them on the floor". javAPRSSrvr and APRS+SA
both do _not_ buffer packets for delayed delivery.
73,
Pete Loveall AE5PL
mailto:pete_at_ae5pl.net
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