aprs is a registered trademark of bob bruninga, wb4apr copyright © 2009 – geoff gatward vk2xjg...
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APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRSIntroduction to APRS
Geoff Gatward - VK2XJGFebruary 2009
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
What is APRS ?• Automatic Packet Reporting System
• Provides situational awareness to all operators of everything that is going on in the local area via packet radio (AX25) protocols.
• Information can be combined with a computer and mapping software to show the transmitted data superimposed on a variety of map displays
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
• Real-time tracking
– Position report beacons (Posits)– Weather conditions and warnings– Virtual “Objects”
• Message Transmission to other APRS users• VoiceAlert
– 91.5Hz CTCSS – acts as an APRS ‘radar’, or always-on back-channel between APRS operators
• Direction Finding
What can I do with APRS?
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
• Remote Telemetry– SiteAlert installed at digipeater site to monitor:
• Battery voltage• Ambient Temperature• Mains Fail / Door Alarms
• Posits stored in global online databases– Review track history via the Internet
• Propagation Indication• Home Automation
– APRS Plugin for HA packages
What can I do with APRS? (2)
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
• Simple PC setup at base station• Tracking of WICEN and other key personnel
– Car rally: Track nominated cars (e.g. 000, Sweep)– Horse events: Track nominated riders – Water events: Track floodboats and nominated
competitors
• Use APRS network as scoring/timing net – Using APRS messaging capabilities– Customised APRS client applications
APRS and WICEN
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
Local Information
• Information relevant to immediate local area is transmitted by digipeaters– Local repeater frequency, offset and subtone– Local club meeting and net times– Hamfest location & Talk-in details
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
• Short (40 character) Station to Station Messages• Bulletins & Announcements• EMERGENCY! Beacons
– Equivalent to SOS or MAYDAY transmissions– Sets off alarms in most clients
Messaging Capability
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
What Equipment Do I Need?
• FIXED (Home)– Transceiver & TNC / Modem– Computer to Run APRS Client Software
• MOBILE:– GPS (with NMEA Serial output)– Transceiver– TNC with GPS capability or APRS Tracker Hardware
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
Tracker Setups
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS Clients• Software
– DosAPRS– MacAPRS/WinAPRS– APRS+SA– UI-View– APRSPoint– Xastir– javAPRS– PocketAPRS– APRSce
• Hardware– PacComm TNC’s– TinyTrack– All In One (MicroTrak)– HamHUD– Kantronics KPC 3/3+– Kenwood TH-D7, TM-D700 & TM-D710– OpenTracker– Yaesu Vx8– Avmap
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS Hardware
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS Hardware
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
UI-View Screenshot Example
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS Telemetry Example
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS RF NETWORK
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
• WIDE Area digipeaters– Each WIDE covers a large area– Coordinated at a state level– Operates with dedicated APRS digipeater firmware
• Fill-In Digipeaters– Set up in areas where access to a WIDE is not possible
• I-Gates– Pass traffic heard via local WIDE digipeaters to Internet– Gate selected traffic from the Internet onto RF
APRS Network Overview
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
• HF Gates– Inject traffic heard on HF into VHF network
• SatGates – Inject traffic heard via APRS capable Satellites into
VHF network
• Users– As many as possible!
APRS Network Overview (2)
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
APRS Frequencies• National 2m Frequency – 145.175• National 70cm Frequency – 439.100 • HF
– 30m 10.149 USB (300bps)– 20m 14.098 USB (300bps) – 40m 7.034 LSB (300bps)
• Satellites– ARISS: 145.825– PCSAT (NO44): 435.250 ↑ / 145.825 ↓– GO32: 435.225 (9k6) ↓
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
• All digipeaters respond to generic aliases• APRS User transmits beacon with fixed path:
– Home Station: APRS via WIDE2-2– Mobile Station: APRS via WIDE1-1,WIDE2-2– HF Station: APRS via GATE,WIDE2-1– Satellite: APRS via ARISS,SGATE,WIDE2-1
• Digipeaters perform smart relaying of beacons
Generic Paths
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
Beacon Rates
• No need to send beacons too frequently– Beacons ‘expire’ from map after 30 minutes– Conserving air-time for all users
• Recommended rates are:– Home/Fixed station = 30 minutes (1800 seconds)– Mobile station = Smart Beaconing if available,
Otherwise 1 minute minimum (5 minutes on HF)
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
Path demo - VHF
APRS v WIDE1-1,WIDE2-2
DIGI-ADIGI-E
DIGI-CDIGI-D
DIGI-BDIGI-F
DIGI-G
I-GATE
APRS v DIGI-A*,WIDE2-2
APRS v DIGI-A*,DIGI-B*,WIDE2-1
APRS v DIGI-A*,DIGI-E*,WIDE2-1
APRS v DIGI-A*,DIGI-B*,DIGI-C*,WIDE2*APRS v DIGI-A*,DIGI-E*,DIGI-F*,WIDE2*
APRS v DIGI-A*,DIGI-E*,DIGI-G*,WIDE2*
DIGI-H
All hops used up No further digipeating
All hops used up No further digipeating
All hops used up No further digipeating
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
Path demo - HF
I-GATE
DIGI-A
HF-GATE
APRS v GATE,WIDE2-1
APRS v GATE*,WIDE2-1
APRS v GATE*,DIGI-A*,WIDE2*
DIGI-B
All hops used up No further digipeatingDIGI-C
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
Path demo - Satellite
I-GATE
DIGI-A
SATGATE
APRS v ARISS,SGATE,WIDE2-1
APRS v ARISS*,SGATE*,WIDE2-1
APRS v ARISS*,SGATE*,DIGI-A*,WIDE2*
DIGI-B
All hops used up No further digipeating
DIGI-C
APRS v ARISS*,SGATE,WIDE2-1
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
SSID
• Even though we can tell from a station's ICON the type of station they are, a set of standards have been devised that links the SSID with the ORIGIN of the beacon. These standards apply globally.
– For example, VK3EFG has a TinyTrack setup with the icon as a CAR. When we see this station on the map we know that it is a car, however how did the beacon get into the network? Using the standard SSID table, we could tell this information easily by looking at the callsign.
• VK3EFG-9 would indicate a standard VHF mobile setup.• VK3EFG-6 would indicate that the station is sending APRS via the
ARISS satellites• VK3EFG-15 would indicate that the station is operating HF APRS.• VK3EFG-7 would indicate that the station is using a Kenwood D7
Handheld, and therefore LOW power.
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
SSID Table
-0 (No SSID) Home Station
-1 Digipeater, or Home Station running a Fill-In Digi,
-2 Digipeater [#2] on 70CM
-3 Digipeater [#3]
-4 HF to VHF Gateway
-5 IGate (Dedicated system, not home station)
-6 Operation via Satellite
-7 Kenwood D7 Handheld
-8 Maritime vessels - Boats, sailboats and ships (VHF / UHF)
-9 Mobiles (VHF / UHF)
-10 Operation via Internet Only (No RF capability)
-11 Aircraft, Helicopters or Balloons
-12 APRStouch-tone users and Portable Units such as Laptops, Camp Sites etc
-13
-14 Interstate Truckers
-15 Operation via HF
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
Current and Proposed Digipeaters
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
Further Information…
• APRS Websites:– http://www.aprs.net.au– http://vk2.aprs.net.au– http://wxsvr.aprs.net.au
• OZAPRS Mailing List:– http://aprs.net.au/mailman/listinfo/ozaprs
APRS is a registered trademark of Bob Bruninga, WB4APRCopyright © 2009 – Geoff Gatward VK2XJG
Q&A