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ZL3AI > APRDIG 05.08.03 19:43l 237 Lines 8559 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Aug 01, 3/3
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: Kantronics' latest offering...
From: "Mark Fellhauer" <sparkfel@qwest.net>
Date: Fri, 01 Aug 2003 15:10:31 -0500
X-Message-Number: 16
At 02:06 PM 8/1/2003, Gerry Creager N5JXS wrote:
>Between my headache and the schedule I'm keeping, I don't have time to
>debate this on the list.
>
>The methodologies for determination are simple. For a 3d autonomous fix,
>you require 4 satellites. Geometry matters. If all you have is 4, then
>you're stuck with whatever geometry you have.
I thought I made it clear no one here really needs a pedantic lesson in the
number of satellites required to achieve a good positional resolution, but
it's the underlying technology between new and old here. The fact of the
matter is that when someone says we're using an 8 channel OEM GPS engine in
our product, I assume that to mean an older non-parallel receiving design,
and that was Mr. Sadowski's point, also. You have gotten hung up on the
the number 8 and not on the real point of the comments made here.
The fact is that newer 12 channel parallel or 16 channel or whatever number
of channel receivers do work better and it's not just a marketing gimmick.
I had a Magellan Trailblazer XL and it would lose lock under moderate tree
canopies, it wouldn't work indoors even with an amplified antenna, it took
many minutes to get a cold first fix, and would often refuse to aquire a
lock if the unit was started in a moving vehicle. It was also prone to RF
saturation and sucked batteries dry like a vampire.
Funny, but every successive GPS I've owned has worked incrementally better
and the newer ones offer more features at less cost. That's the
point. Kantronics is offering what amounts to putting a 1995 Magellan
Trailblazer XL in product being sold in 2003.
Mark
KC7BXS
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Subject: Re: TNCless 1-wire weather?
From: "Scott Miller" <scott@opentrac.org>
Date: Fri, 1 Aug 2003 15:11:49 -0700
X-Message-Number: 17
Thanks to everyone who replied... I've ordered a uWeather board from
rxcomm.net and it looks like it'll do what I need. Gotta figure out my
power budget and size a battery and solar panel now. Using a 12v SLA
battery and a solar panel of just a few watts, I should be able to get away
with just a rectifier diode on the panel, right? Or is overcharging still
going to be a problem?
Scott
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Subject: Re: More APRS perl findu.com code examples
From: "Andrew VK4TEC" <vk4tec@hotmail.com>
Date: Sat, 2 Aug 2003 08:17:27 +1000
X-Message-Number: 18
Thanks Steve,
I have removed it. Hey so If I have MAPS I have paid for, can I use them to
my hearts content ?
Here we go, I hope we don't luanch into a map and copywrite ear bash.
Andrew vk4tec
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Subject: GARMIN Track Log to APRS converter ?
From: "Andrew VK4TEC" <vk4tec@hotmail.com>
Date: Sat, 2 Aug 2003 08:24:40 +1000
X-Message-Number: 19
Before I re-invent the wheel,
Has anyone written software that can interigate a GARMIN GPS in
GARMIN/GARMIN mode and output and APRS data packet ?
I am willing to have a go.
Andrew vk4tec
www.tech-software.net
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Subject: Re: More APRS perl findu.com code examples
From: "Curt Mills, WE7U" <hacker@tc.fluke.com>
Date: Fri, 1 Aug 2003 15:32:49 -0700 (PDT)
X-Message-Number: 20
On Sat, 2 Aug 2003, Andrew VK4TEC wrote:
>I have removed it. Hey so If I have MAPS I have paid for, can I use them to
>my hearts content ?
Typically yes, for your own purposes only. When you start giving other
people access to them, you'd better read the fine print in the agreement
you made when you bought the maps. Usually they don't like that.
>Here we go, I hope we don't luanch into a map and copywrite ear bash.
A better way is to find maps that are accessible via URL and don't have
limitations on their use. Sometimes these are hard to find.
Here in the U.S. we have Tigermap server (street maps), Terraserver
w/satellite images, and Terraserver w/topo maps. I know the first one is
totally free for all uses. The data and the site were paid for by
taxpayers. I think terraserver is free as well: It uses USGS
taxpayer-funded data.
We can use all three types from within Xastir. Findu station trails can be
snagged down/overlaid on top of any of these sources by Xastir also. Up to
two weeks worth for any station.
--
Curt Mills, WE7U hacker_NO_SPAM_@tc.fluke.com
Senior Methods Engineer/SysAdmin
"Lotto: A tax on people who are bad at math!"
"Windows: Microsoft's tax on computer illiterates!" -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
----------------------------------------------------------------------
Subject: Re: GARMIN Track Log to APRS converter ?
From: "B. Hildebrand" <bhildebrand@earthlink.net>
Date: Fri, 1 Aug 2003 15:43:31 -0700
X-Message-Number: 21
There are many ways to work with the Garmin. Garmin mode works fine, but as
I recall, Altitude is lacking when you poll the device for position. With
PVT turned on, you get everything you need. Garmin also has TEXT OUT mode
which is a 56 byte simple ASCII packet with Date/Time to the second, 3-D
Position, and 3-D velocity and 2-D error. TEXT out works great for a dumb
tracker. But I only know of one APRS program that decodes it. Brent KH2Z
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Subject: Re: More APRS perl findu.com code examples
From: "Scott Miller" <scott@opentrac.org>
Date: Fri, 1 Aug 2003 16:05:30 -0700
X-Message-Number: 22
So I should be able to re-distribute all USGS data I get from gisdatadepot,
right? They're just contracted for distribution, if I understand right.
----------------------------------------------------------------------
Subject: Re: GARMIN Track Log to APRS converter ?
From: "Scott Miller" <scott@opentrac.org>
Date: Fri, 1 Aug 2003 16:07:03 -0700
X-Message-Number: 23
I was hoping to use the 3d velocity output to make a GPS-based variometer
for my paraglider, but it turns out it's averaged over something like 10
seconds.
Assuming you could get at the raw data, how accurate is vertical speed from
a gps? I know vertical position sucks, but isn't gps generally more
accurate in speed than position?
Scott
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Subject: Re: GARMIN Track Log to APRS converter ?
From: "Andrew VK4TEC" <vk4tec@hotmail.com>
Date: Sat, 2 Aug 2003 09:07:41 +1000
X-Message-Number: 24
Sorry, I meant download the track log and convert to APRS format
----------------------------------------------------------------------
Subject: Re: More APRS perl findu.com code examples
From: Steve Dimse <k4hg@tapr.org>
Date: Fri, 1 Aug 2003 20:39:33 -0400
X-Message-Number: 25
On 8/1/03 at 4:05 PM Scott Miller <scott@opentrac.org> sent:
>So I should be able to re-distribute all USGS data I get from gisdatadepot,
>right? They're just contracted for distribution, if I understand right.
Their site answers this:
-------
Q20: Are there any copyrights associated with the free online data?
All of the data available via the GIS Data Depot is free of a copyright .
-------
Most of the US maps that are copyrighted are based on the same data from
the USGS. The data itself is available for anyone to use, but when the data
is converted to a map it can be copyrighted.
You must read the site/program licenses carefully to see what you are
allowed to do. Most prohibit placing images onto the internet, modifying or
retransmitting them. You could use any copyrighted map with a geo file in
findU and be safe, no one could know. However when you advertise it or
place links to it on a web page, you run the risk of infringing.
As recent events in the music swapping arena show, big businesses are
realizing that lawsuits are cost-effective ways of scaring a large
population. I am doing all I can to be sure I'm not first in line to be
sued over maps!
Steve K4HG
----------------------------------------------------------------------
Subject: Request
From: "Andrew VK4TEC" <vk4tec@hotmail.com>
Date: Sat, 2 Aug 2003 12:16:22 +1000
X-Message-Number: 26
Dear Sir's
I would like to request to freely experiment and extend my knowledge of the
world.
I ask for fear of making some lawer rich.
pun intended
---
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