| |
ZL3AI > APRDIG 18.05.03 09:26l 301 Lines 10646 Bytes #999 (0) @ WW
BID : 1343-ZL3AI
Read: GUEST
Subj: TAPR Digest, May 16, 1/2
Path: DB0FHN<DB0RGB<DB0MRW<OK0PKL<OK0PCC<OK0PPR<OK0PPL<RZ6HXA<SP7MGD<VK7AX<
ZL2BAU<ZL3VML
Sent: 030517/1344Z @:ZL3VML.#80.NZL.OC #:439 [Chch-NZ] FBB7.00i $:1343-ZL3AI
From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Friday, May 16, 2003.
1. Re: FIPS locator
2. Re: FIPS locator
3. aprsserve connects?
4. Re: [amsat-bb] Cable Modems on HAM bands?
5. Hamvention GPS position
6. Re: aprsserve connects?
7. Re: FIPS locator
8. Re: aprsserve connects?
9. Re: Cable Modems on HAM bands?
10. Hara coordinates
11. Xastir on Windows/Cygwin
12. Re: Hara coordinates
13. Re: Hara coordinates
14. I am blown away - have a look at this
15. Re: Hara coordinates
16. Re: APRS Install on BMW Motorcycle
----------------------------------------------------------------------
Subject: Re: FIPS locator
From: Steve Dimse <k4hg@tapr.org>
Date: Thu, 15 May 2003 19:34:32 -0400
X-Message-Number: 1
On 5/14/03 at 11:46 AM hacker@tc.fluke.com (Curt Mills, WE7U) sent:
>Nope! We use what I consider to be a better format, ESRI
>Shapefiles. You can get Tiger data converted to Shapefile format
>for free from at least a couple of sites on the net. They're listed
>in the Xastir README files.
Could you share why shapefiles are better? For Miami-Dade county, they are
a little bit larger than the unzipped text files, and comparing the two on
the same machine, Xastir draws the same area in four seconds, as opposed to
perhaps half a second with the new MacAPRS. WinAPRS, running on Virtual PC,
draws the map in perhaps 1.5 seconds.
Xastir draw Palm maps faster than MacAPRS, so this isn't a function of X
windows system...
Steve K4HG
----------------------------------------------------------------------
Subject: Re: FIPS locator
From: Gerry Creager N5JXS <gerry.creager@tamu.edu>
Date: Fri, 16 May 2003 06:08:36 -0500
X-Message-Number: 2
Ubiquity. Shapefile maps are an industry standard. Basemaps are
generally available in .shp format from a variety of commercial sources,
albeit at varying qualities.
While there are several competing GIS standards, almost everyone who has
to share data will share it in shapefile format. Thus, your County GIS
folks can almost certainly provide a mapset comprising the 3 reuired
files (.shp/.shx/.dbf) very easily for specialty maps.
--
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
----------------------------------------------------------------------
Subject: aprsserve connects?
From: "Wes Johnston" <wes@johnston.net>
Date: Thu, 15 May 2003 21:59:01 -0400
X-Message-Number: 3
What is the format for the login to aprsserv which allows you to only
receive stations from a smaller area? I'm on dialup lately, so the entire
stream is overwhelming.
Wes
----------------------------------------------------------------------
Subject: Re: [amsat-bb] Cable Modems on HAM bands?
From: Adi Linden <adil@adis.on.ca>
Date: Fri, 16 May 2003 09:55:22 -0500 (CDT)
X-Message-Number: 4
>Any experts want to fill in the modem details and the bandwidths and
>frequencies?
That's an interesting idea. There is a commercial product that does
something similar.
Wavecom has a DOCSIS over wireless product. You need proper headend
equipment, such as a Cisco ubr7111 cable router. The upstream and
downstream of the cable router are connected to converters which moves the
spectrum of the cable router into an unlicensed ISM band. At the customer
premises there is a similar converter that takes the ISM band signal and
brings it down to something the cable modem can chew.
On a DOCSIS cable system, the downstream (going from the headend to the
cable modem) typically uses QPSK (64-QAM or 16-QAM). The downstream uses a
6 MHz channel width in the 85-to-860 MHz frequency range. Effective bit
rate is about 27Mbps on the downstream.
The upstream (going from the cable modem to the headend) typically uses
QPSK (or 16-QAM). The upstream supports the 5-to-42 MHz frequency range
and a typical channel width of 3.2MHz.
Hope this helps...
Adi
--
Adi Linden | va3adi | va3adi@adis.ca | http://adis.ca
+-----------------------------------------------------------------+
IRLP Node 2590 in Sioux Lookout, Ontario
----------------------------------------------------------------------
Subject: Hamvention GPS position
From: Jim Sanford <wb4gcs@amsat.org>
Date: Fri, 16 May 2003 11:09:11 -0400
X-Message-Number: 5
I know it's been around before, but can't find it on the hamvention web
page. Anybody have GPS position for Hara?
A mobile just asked me for it.
Thanks & 73,
Jim
wb4gcs@amsat.org
----------------------------------------------------------------------
Subject: Re: aprsserve connects?
From: "Phil Pacier, AD6NH" <ad6nh@arrl.net>
Date: Fri, 16 May 2003 10:46:6
X-Message-Number: 6
See http://www.aprsca.net/ports.txt for some information you might find
handy.
73
Phillip Pacier - AD6NH
http://www.aprsca.net
----------------------------------------------------------------------
Subject: Re: FIPS locator
From: "Curt Mills, WE7U" <hacker@tc.fluke.com>
Date: Fri, 16 May 2003 09:16:28 -0700 (PDT)
X-Message-Number: 7
On Fri, 16 May 2003, Gerry Creager N5JXS wrote:
>Ubiquity. Shapefile maps are an industry standard. Basemaps are
>generally available in .shp format from a variety of commercial sources,
>albeit at varying qualities.
>
>While there are several competing GIS standards, almost everyone who has
>to share data will share it in shapefile format. Thus, your County GIS
>folks can almost certainly provide a mapset comprising the 3 reuired
>files (.shp/.shx/.dbf) very easily for specialty maps.
Also: The TigerLine format keeps changing every year or three, so if you
want to keep using their format, you have to keep changing your software to
correspond, while also keeping backward compatibility with the older
formats in case someone wants to load older files.
Shapefiles sidestep that problem entirely.
Besides that, having the extents of the entire map file available quickly
allows you to skip maps that don't fit in the viewport. Shapefiles also
have extents for each shape, so you can skip shapes that don't fit within a
file.
The Shapefile code in Xastir is still in it's first generation. It hasn't
been optimized at all, and in fact there's a lot of code that it goes
through just trying to determine what sort of map it is and how it should
be presented on the screen. I suspect that with optimization it'd be as
fast or faster than the equivalent WinAPRS implementation of TigerLine
files. We'll be redoing all of that stuff when we start on the Xastir-2
project (Real Soon Now!).
--
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: aprsserve connects?
From: "Dick Stanich" <dick@kb7zva.com>
Date: Fri, 16 May 2003 11:16:57
X-Message-Number: 8
On 05/16/03, ""Wes Johnston" <wes@johnston.net>" wrote:
>What is the format for the login to aprsserv which allows you to only
>receive stations from a smaller area? I'm on dialup lately, so the entire
>stream is overwhelming.
Pulling the exact data you want from our servers by using the 'User
Definable Ports'. No need to run any other software.
Some ports on these level 2 servers are pre-defined, and you still can send
messages world-wide. Ports.txt is an excellent way to get started as Phil
mentioned. Currently the following level 2 servers support these User
Definable Ports:
aprswest.net
aprsca.net
aprsfl.net
ahubswe.net
As simple as sending a message to the server, telling it what you want it
to send you.
Dick, KB7ZVA
APRSWEST
http://kb7zva.com
----------------------------------------------------------------------
Subject: Re: Cable Modems on HAM bands?
From: "Joseph C. Bender" <n8xre@benderhome.net>
Date: Fri, 16 May 2003 14:31:17 -0400 (EDT)
X-Message-Number: 9
Bob Bruninga said:
>A Cable Modem operates at RF (in a cable TV system).
Yes, so?
>WHy not simply hook it up to a converter to up/down convert the signal
>to a pair of HAM bands and get High data rates on the HAM bands.
Cute. But who runs the head-end? Cable modems are set up as a
one-to-many network, largely controlled by the cable company's local
head-end.
The network settings, channel slot assignments and clocking come from
there. It's a TDMA-style access.
>This idea came from Ron Parise WA4SIR during a chat around the water
>cooler. There's lots we don't know, and maybe someone on the APRS or
>AMSAT sigs works in the industry and can fill us in.
>
>Things we assume:
>1) Uplink is below 50 MHz, downlink is somewhere in the CATV passband.
>2) Since uplink and donwlink are different, then a "repeater" would
>need to be installed in the city to tie everyone togther (or a HAM
>satellite).
>This approach at taking a consumer item and modifying it for HAM use
>has a certain atttraction, since it gives us an unlimited supply of
>cheap hardware on which to build... The ONLY thing we have to build
>are the repeaters (or satellite), for all of use users its
>plug-n-play.
I understand the need for common ubiquitous hardware to run next-gen ham
networking on, but who's going to put the cash into building these
head-end systems in various metro areas? Satellite is out of the
question, if you read the specs (see below).
>Any experts want to fill in the modem details and the bandwidths and
>frequencies?
A 30-second Google search for Cable Modem and "DOCSIS" (The prevalent
standard) turned up: <http://www.cablelabs.com> Two clicks later
provided a wealth of PDF files.
>Bob
>
>Since the uplink (inlink) is low data rate, it could probably fit
>easily in the 220 or 440 band somewhere, the downlink (or outlink)
>might fit in 900 or 1296 somewhere...?
The bandwidth on the ham bands would probably kick it 440 or higher
because of channel sizing (If I'm reading the documents correctly)
Bob, I'm not trying to sound so negative, but a little searching before
posting would have turned this stuff up.
Though, I do think the 2.4 GHz MMDS(?) systems (Sprint broadband-type)
would work a little bit better. Or possibly tech like the Riccochet
mini-cellular technology, which would enable all operators to repeat for
others, transparently, if enabled correctly.
--
Joseph C. Bender
n8xre at benderhome net
----------------------------------------------------------------------
Read previous mail | Read next mail
| |
