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PA2AGA > HDDIG 24.07.00 03:14l 194 Lines 7462 Bytes #-9305 (0) @ EU
BID : HD_2000_196B
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Subj: HamDigitalDigest 2000/196B
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From: PA2AGA@PI8HGL.#ZH1.NLD.EU
To : HDDIG@EU
Date: Sat, 22 Jul 00 14:54:31 MET
Message-Id: <hd_2000_196B>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
X-BBS-Msg-Type: B
incoming messages alert the user on arrival and are held on the
message screen until killed.
* Bulletins and Announcements -- Bulletins and announcements are
addressed to everyone. Bulletins are sent a few times an hour for a
few hours, and announcements less frequently but possibly over a
few days.
* Fixed Station Tracking -- In addition to automatically tracking mobile
GPS/LORAN-equipped stations, APRS also tracks from manual reports or
grid squares.
* Objects -- Any user can place an APRS Object on his own map, and
within seconds that object appears on all other station displays. This
is particularly useful for tracking assets or people that are not
equipped with trackers. Only one packet operator needs to know where
things are (e.g. by monitoring voice traffic), and as he maintains the
positions and movements of assets on his screen, all other stations
running APRS will display the same information.
--------------------------------
Where to hear APRS transmissions
--------------------------------
One of the biggest benefits of APRS is that it only uses one frequency
to work on -- everyone shares it. In North America, this is 144.390 MHz.
In the United Kingdom and several European countries it is 144.800 MHz.
---------------------------------
Where to find out more about APRS
---------------------------------
These web sites have a wealth of information on APRS, including
documentation and sources of software:
http://www.tapr.org
http://www.aprs.org
http://www.dididahdahdidit.com
http://www.packetradio.org.uk
The full APRS Protocol Specification is at:
http://www.tapr.org/tapr/html/Faprswg.html
29 February 2000
73
Ian, G3NRW
Technical Editor, APRS Protocol Specification
--
+--------------------------------------------------------------------+
| APRS on 144.800 [IO91SX] ~55km/35 miles NNW of London |
| email: g3nrw@tapr.org |
| |
| APRS PROTOCOL SPEC: http://www.tapr.org/tapr/html/Faprswg.html |
| <APRSdec> APRS DECODER: http://www.tapr.org/~g3nrw |
| Mic-Encoder Software: http://www.tapr.org/~g3nrw |
+--------------------------------------------------------------------+
------------------------------
Date: Thu, 20 Jul 2000 10:06:08 -0400
From: "Joseph R. Skoler" <joseph@compuhelp.com>
Subject: Getting back into packet -- need info please
Sounds very cool.
Thanks for the info.
How would I broadcast/transmit local weather?
Ian Wade <Ian.Wade@care4free.net> wrote in message
news:JtQEcWALovd5EwHs@care4free.net...
> In article <8l6qkr$cqs$1@news.panix.com>, Joseph R. Skoler
> <joseph@compuhelp.com> writes
> >
> >Well, looks like it's a consensus: Packet did not bloom into the
wonderful
> >thing I had hoped it would.
> >
>
> ..... except in one respect: APRS (Automatic Position Reporting System).
> APRS is very much alive and well. Here's a brief summary:
>
>
> ====================
> INTRODUCTION TO APRS
> ====================
>
> -------------
> What is APRS?
> -------------
> APRS is short for Automatic Position Reporting System, which was
> introduced by Bob Bruninga, WB4APR, at the 1992 TAPR/ARRL Digital
> Communications Conference. Fundamentally, APRS is a packet
> communications protocol for disseminating live data to everyone on a
> network in real time. Its most visual feature is the combination of
> packet radio with the Global Positioning System (GPS) satellite network,
> enabling radio amateurs to automatically display the positions of radio
> stations and other objects on maps on a PC. Other features not directly
> related to position reporting are supported, such as weather station
> reporting, direction finding and messaging.
>
> APRS is different from regular packet in several ways:
>
> * It provides maps and other data displays, for vehicle/personnel
> location and weather reporting in real time.
>
> * It performs all communications using a one-to-many protocol, so that
> everyone is updated immediately.
>
> * It uses generic digipeating, with well-known callsign aliases, so that
> prior knowledge of network topology is not required.
>
> * It supports intelligent digipeating, with callsign substitution to
> reduce network flooding.
>
> * Using AX.25 UI-frames, it supports two-way messaging and distribution
> of bulletins and announcements, leading to fast dissemination of text
> information.
>
> * It supports communications with the Kenwood TH-D7 and TM-D700 radios,
> which have built-in TNC and APRS firmware.
>
> Conventional packet radio is really only useful for passing bulk message
> traffic from point to point, and has traditionally been difficult to
> apply to real-time events where information has a very short lifetime.
> APRS turns packet radio into a real-time tactical communications and
> display system for emergencies and public service applications.
>
> APRS provides universal connectivity to all stations, but avoids the
> complexity, time delays and limitations of a connected network. It
> permits any number of stations to exchange data just like voice users
> would on a voice net. Any station that has information to contribute
> simply sends it, and all stations receive it and log it.
>
> APRS recognizes that one of the greatest real-time needs at any special
> event or emergency is the tracking of key assets. Where is the marathon
> leader? Where are the emergency vehicles? What's the weather at
> various points in the county? Where are the power lines down? Where is
> the head of the parade? Where is the mobile ATV camera? Where is the
> storm?
>
> To address these questions, APRS provides a fully featured automatic
> vehicle location and status reporting system. It can be used over any
> two-way radio system including amateur radio, marine band, and cellular
> phone. There is even an international live APRS tracking network on the
> Internet.
>
> -------------
> APRS Features
> -------------
> APRS runs on most platforms, including DOS, Windows 3.x, Windows 95/98/
> 2000/NT, MacOS, Linux and Palm. A new version for WinCE is due for
> release soon.
>
> Most implementations on these platforms support the main features of
> APRS:
>
> * Maps -- APRS station positions can be plotted in real-time on maps,
> with coverage from a few hundred yards to worldwide. Stations
> reporting a course and speed are dead-reckoned to their present
> position. Overlay databases of the locations of APRS digipeaters, US
> National Weather Service sites and even amateur radio stores are
> available. It is possible to zoom in to any point on the globe.
>
> * Weather Station Reporting -- APRS supports the automatic display of
> remote weather station information on the screen.
>
> * DX Cluster Reporting -- APRS an ideal tool for the DX cluster user.
> Not only is it possible to see all DX spots on the map, but by
> operating in the monitor-only mode, the overall packet load on the
> DX cluster is reduced. This is a benefit to everyone on the channel.
>
> * Internet Access -- The Internet can be used transparently to cross-
To be continued in digest: hd_2000_196C
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