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ZL3AI > APRDIG 06.08.03 08:36l 267 Lines 9377 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Aug 03, 1/2
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Sunday, August 03, 2003.
1. Number of GPS birds
2. Re: Lat, lon, format confusion
3. Re: Number of GPS birds
4. Re: HF APRS SIG
5. Re: GARMIN GPS72 for APRS
6. Re: HF APRS SIG
7. KPC-2 calibrate instructions
8. Xastir & Sharp Zaurus SL-5500
9. GPS and TNC on single serial port, how does it work?
10. Re: GPS and TNC on single serial port, how does it work?
11. Re: GPS and TNC on single serial port, how does it work?
12. PICs cheap!
13. Re: GPS and TNC on single serial port, how does it work?
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Subject: Number of GPS birds
From: "Andrew VK4TEC" <vk4tec@hotmail.com>
Date: Sun, 3 Aug 2003 18:41:53 +1000
X-Message-Number: 1
I just did a download of the ALMANAC from my GPS
Seems there are 32 birds up there, some had a health of -1 (i guess it means
off)
Andrew vk4tec
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Subject: Re: Lat, lon, format confusion
From: "Joel Black" <w4jbb@charter.net>
Date: Sun, 3 Aug 2003 06:47:51 -0500
X-Message-Number: 2
I have noticed that too and cannot figure out why the inconsistencies.
Generally, I go out to my eTrex and tell it to display in the format needed.
GL es 73,
Joel B. Black, W4JBB
w4jbb@charter.net
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Subject: Re: Number of GPS birds
From: Gerry Creager N5JXS <gerry.creager@tamu.edu>
Date: Sun, 03 Aug 2003 10:26:46 -0500
X-Message-Number: 3
The nominal constellation is 4 satellites in 6 planes at 60 degree spacing.
USDoD periodically launches new satellites and parks them in one or another
plane as on-orbit spares. Having a surplus of birds on-orbit allows them
to fail a satellite with problems, and work on it in a more leisurely
manner.
Some of the on-orbit-spares are routinely available for use, increasing the
number of birds that might be visible, and aloowing more possiblilities for
overdetermined autonomous fix resolution.
gerry
--
Gerry Creager -- gerry.creager@tamu.edu
Network Engineering -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
Page: 979.228.0173
Office: 903A Eller Bldg, TAMU, College Station, TX 77843
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Subject: Re: HF APRS SIG
From: Glenn Wiebe <gswiebe@mts.net>
Date: Sun, 03 Aug 2003 10:46:52 -0500
X-Message-Number: 4
How about on SIG, if there is such a SIG I'd be interested too.
73 de Glenn
Eric Christensen wrote:
>
>I remember there was an HF APRS SIG that was created. Can someone
>send me (off list) that information, please? I think I am a
>subscriber but I cannot find the email address or anything associated
>with it.
>
>Thanks,
>Eric KF4OTN
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Subject: Re: GARMIN GPS72 for APRS
From: John Becker <w0jab@big-river.net>
Date: Sun, 03 Aug 2003 11:16:13 -0500
X-Message-Number: 5
I was looking at the 72 also till I found out that you can not hook it up
to an outside antenna. Now looking at the GPS-76.
Anyone using this unit?
John, W0JAB
>Gents,
>Picked up a GARMIN GPS72 for APRS. Seems to do all I want it to do, as well
>as put APRS stations on the screen.
>www.tech-software.net/aprs.htm
>Screen dumps included
>Andrew vk4tec
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Subject: Re: HF APRS SIG
From: "Eric Christensen" <kf4otn@earthlink.net>
Date: Sun, 3 Aug 2003 12:44:32 -0400
X-Message-Number: 6
It is Yahoo Groups... HF-APRS... I finally found it!
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Subject: KPC-2 calibrate instructions
From: Stan <stan911@optonline.net>
Date: Sun, 03 Aug 2003 19:48:03 -0400
X-Message-Number: 7
Need a bit of help with a TNC I will be using for an APRS node.
Works fine, but TX level needs to be raised.
Need specific instructions. Once it is given the cal command, what sets the
level?
Is there another method?
Anyone have a schematic and/or installation manual?
I have the command and operations manual?
Thanks,
Stan N2NKI
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Subject: Xastir & Sharp Zaurus SL-5500
From: Vince <heffer@mindspring.com>
Date: Sun, 03 Aug 2003 19:55:08 -0400
X-Message-Number: 8
Hi,
Has anyone tried Xastir on a Sharp Zaurus SL-5500?
another subject and a rant - I really haven't asked questions here before,
opinions yes :) but I've found my past posts are available to spammers on
TAPR and a mirror site (do a search for my e-mail address). So now we
have death, taxes and SPAM. :)
Guess I've learned to live with it; just hope a client doesn't get missed.
Best,
Vince
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Subject: GPS and TNC on single serial port, how does it work?
From: Adi Linden <adil@adis.on.ca>
Date: Sun, 3 Aug 2003 19:47:32 -0500 (CDT)
X-Message-Number: 9
I would like to use a notebook computer with a single serial port (no USB
support) for a mobile APRS station. I need to connect a GPS and a TNC.
I am aware of 3 options, the HSP cable, the KPC-3+, and PicoPacket. How do
these solutions work to allow communications with the TNC and the GPS via
the same serial line? I've googled for answers, but no luck.
Adi
--
Adi Linden | va3adi | va3adi@adis.ca | http://adis.ca
+-----------------------------------------------------------------+
IRLP Node 2590 in Sioux Lookout, Ontario
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Subject: Re: GPS and TNC on single serial port, how does it work?
From: Bill Herrmann <bherrman@spro.net>
Date: Sun, 03 Aug 2003 20:22:40 -0600
X-Message-Number: 10
At 07:47 PM 8/3/2003 -0500, Adi Linden wrote:
>I am aware of 3 options, the HSP cable, the KPC-3+, and PicoPacket. How do
>these solutions work to allow communications with the TNC and the GPS via
>the same serial line? I've googled for answers, but no luck.
The HSP cable just provides a way for the software to switch between the
two devices. The laptop can listen to one or the other but misses anything
from the one it isn't listening to. I don't know anyone using that
solution.
The KPC3+ and PicoPacket use a similar solution. Each has a second serial
port (or portion thereof) and receives and processes the GPS data. The
PicoPacket has 2 hardware serial ports. I'm not sure how full function they
are. The KPC3+ has one hardware port and one limited functionality software
implemented serial port. (It is basically a 2 wire receive-only serial
port.) In spite of that it works very well. (I've heard anecdotal
statements that it works as well or better than the Pico's 2nd hardware
port, but I've never worked with a Pico...)
Software running on the laptop can query the current GPS data at any time
by sending a special character down to the TNC. By default that is a
<ctrl-e>. The TNC responds by sending the GPS data back. There are several
advantages to this. The TNC (at least on the KPC3+ and I believe on the
Pico) is APRS aware enough to be a simple tracker without any laptop
connected. It simplifies the connection at the laptop end. I just connect
one cable and I'm ready to go.
Two tips for the KPC3+
Make sure you have firmware version 8.3 or higher. The software serial port
didn't become active until that version. (The hardware is there and the
firmware is upgradable.)
Many people use a Y cable to provide the connection for the GPS and radio
to the TNC. (The GPS port uses 1 pin and ground from the radio port.) I
used a back to back housing so it's more rigid. I brought the packet cable
out the side and wire-tied it to the housing.
HTH!
Bill
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Subject: Re: GPS and TNC on single serial port, how does it work?
From: "Wes Johnston" <wes@johnston.net>
Date: Sun, 3 Aug 2003 23:08:32 -0400
X-Message-Number: 11
HSP: Aserts flow control on the TNC once a minute to stem the flow of data.
Since TNCs have sufficient buffer space, a momentary pause on the rs232 port
will not cause any lost data. During the TNC's pause, the GPS data input is
switched on and GPS data is collected. Since GPS data repeats all the time
it really doesn't matter when it's heard.
PICO and KPC3+: The GPS has two serial ports. One talks to your PC, the
other just listens to the GPS and collects data. Once a minute, your APRS
software query's the TNC for it's latest GPS data usually by sending a
CNTRL-E. The TNC responds by simply transmitting the last copy or either
GPRMC or GPGGA string heard from the GPS.
Both methods have their pros and cons. The HSP method allows you to collect
more than one sentance from the GPS... like satellite signal strength for
example. But its prone to loosing characters heard from the TNC if it
should decide to switch to GPS data right in the middle of the TNC sending
data.
The pico / kpc3+ method does not loose any characters, but it will only give
you one gps sentance.
In most cases the kpc3+ / pico method is preferable.
Wes
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