APRS - Versionsgeschichte

Dl8rds am 6. März 2009 um 03:02 Uhr

2009-03-06T03:02:45Z

Dl8rds am 24. November 2008 um 00:12 Uhr

2008-11-24T00:12:30Z

Dl8rds am 23. November 2008 um 23:43 Uhr

2008-11-23T23:43:20Z

Dl8rds am 23. November 2008 um 23:28 Uhr

2008-11-23T23:28:44Z

Dl8rds am 23. November 2008 um 23:28 Uhr

2008-11-23T23:28:13Z

Dl8rds: New page: Automatic Position Reporting System. A service based on Packet Radio. === Involved Hardware === In order to generate APRS packets: * You generally have a GPS receiver * and a little Ter...

2008-10-14T01:54:55Z

New page: Automatic Position Reporting System. A service based on Packet Radio. === Involved Hardware === In order to generate APRS packets: * You generally have a GPS receiver * and a little Ter...

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Automatic Position Reporting System. A service based on Packet Radio.

=== Involved Hardware ===
In order to generate APRS packets:
* You generally have a GPS receiver
* and a little Terminal Node Controller (TNC) which encodes the NMEA data from the GPS receiver in the AX.25 data format and makes sure the channel is not busy. If the channel is free, the TNC sends the packet to the radio.
* In Europe, the APRS frequency is generally 144.800 MHz. So you need a 2m VHF radio.

There are also handheld and mobile transceivers on sale which have a TNC built in. There are also tracker devices around which substitute the TNC and are much smaller. Anyway, there are all sorts of products meanwhile...

On the other side, someone needs to receive these packets. So there again, you need
* a radio for 144.800 MHz,
* a TNC to decode the packets. It's noteworthy that most TNCs are operated in the KISS mode which loads all the data processing on the computer residing behind.
* a computer which processes the packets. They can either be projected onto a map locally or they can be forwarded through the internet to '''aprs.fi''' where they are projected into a Google map. So you can eventually track an APRS station on a map.

In case there is no internet-connected station nearby, APRS stations may also act as relays. This means that an APRS station receives a packet and assumes that it must forward it. So the packet will be re-broadcasted again in the hope that there is another station around that is able to forward it to the internet. This practice is causing quite some traffic.

=== Involved Software ===
I will just consider OpenWRT software since I am firmly convinced that high-power computers are massively undercharged by the task of forwarding packets that come in by 1200 bit / second.

* aprx - a receiving only APRS forwarder
* aprs4r - a fully fledged APRS digipeater

=== Related Projects ===
* [[Using the ASUS WL-500gP as a APRS digi]]

← Nächstältere Version		Version vom 6. März 2009, 03:02 Uhr
Zeile 1:		Zeile 1:
	Automatic Position Reporting System. A service based on Packet Radio.		Automatic Position Reporting System. A service based on Packet Radio.
		+
		+	=== My Site ===
		+	Have a look here:
		+
		+	* http://aprs.dl8rds.de

	=== Involved Hardware ===		=== Involved Hardware ===

← Nächstältere Version		Version vom 24. November 2008, 00:12 Uhr
Zeile 15:		Zeile 15:

	In case there is no internet-connected station nearby, APRS stations may also act as relays. This means that an APRS station receives a packet and assumes that it must forward it. So the packet will be re-broadcasted again in the hope that there is another station around that is able to forward it to the internet. This practice is causing quite some traffic.		In case there is no internet-connected station nearby, APRS stations may also act as relays. This means that an APRS station receives a packet and assumes that it must forward it. So the packet will be re-broadcasted again in the hope that there is another station around that is able to forward it to the internet. This practice is causing quite some traffic.
		+
		+	Here's some information ont the [[KF-163]]

	=== Involved Software ===		=== Involved Software ===

← Nächstältere Version		Version vom 23. November 2008, 23:43 Uhr
Zeile 24:		Zeile 24:
	=== Related Projects ===		=== Related Projects ===
	* [[Using the ASUS WL-500gP as a APRS digi]]		* [[Using the ASUS WL-500gP as a APRS digi]]
		+
		+	=== Further Information ===
		+	* [http://www.aprs-dl.de/index.php?APRS_Detailwissen details in German]

@@ Zeile 11: / Zeile 11: @@
 On the other side, someone needs to receive these packets. So there again, you need
 * a [[KF-166|radio for 144.800 MHz]],
-* a TNC to decode the packets. It's noteworthy that most TNCs are operated in the KISS mode which loads all the data processing on the computer residing behind.
+* a [[TNC2S|TNC]] to decode the packets. It's noteworthy that most TNCs are operated in the KISS mode which loads all the data processing on the computer residing behind.
 * a computer which processes the packets. They can either be projected onto a map locally or they can be forwarded through the internet to '''aprs.fi''' where they are projected into a Google map. So you can eventually track an APRS station on a map.