Introduction to APRS By Guy Story KC 5

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Introduction to APRS By Guy Story, KC 5 GOI www. kc 5 goi. net kc 5 goi@kc 5 goi. net

Topics to be covered • • What is APRS? Why do I want APRS? How do I view APRS? OK, now how do I go mobile? Current software The internet piece of the puzzle Upcoming goodies

What is APRS • • Automatic Position Reporting System • By Bob Bruninga, WB 4 APR • Brief history

History of APRS • Initial use as we know it in 1990 to track boats during summer cruises. The following flavors followed. • Mac. APRS • Win. APRS • APRS+ • pocket. APRS just released • Perl. APRS • XAPRS released as beta at 1999 Dayton Hamvention

Why do I want APRS? • For Starters…. • Ok, Joe Ham tells me he has a bike rider down but has no clue were he is. • Or, Joe Ham has hail coming down and still has no clue were he is. • Joe Ham is part of a disaster evaluation team.

How do I view APRS?

Software • • There are many flavors to APRS DOS APRS Win. APRS and APRS+SA Mac. APRS XAPRS for Linux (currently in beta) pocket APRS (Palm Pilot) APRSdigi, digi software Perl. APRS

OK, now how do I go mobile? • • • TNC route Mic-E route Pic-E route GPS receiver Do I have/want to use a laptop?

Mobile Equipment

TNC Verses Mic-E or Pic-E • TNC route requires a separate radio • Mic-E and Pic-E can go in-between radio and mic. • Either route can be run on separate radio • Either route is referred to as a “TRACKER”

Definitions • A tracker is a mobile station • Posits are position reports • UI Frames are frames that do not employ error correction techniques, entirely that is. • Digipeaters are stations that act as a simplex repeater except in a digital format • IGATES are stations that feed data to and from the internet

Definitions • GATES are stations that take the HF APRS data and retransmits them on VHF and possible the internet. • APRServers are stations that IGATES send data to and redistribute them to the IGATEs

How does it work, basically? • A tracker or fixed stations sends out a UI frame that has lat/long and possibly other data. • If the packet burst passes the checksum, the info is then displayed on the screen. • If the checksum fails, the packet is lost. This is not a big deal since the posit will be transmitted again soon.

The Next Level • IGATES, why would I want to do this? • IGATES provide a feed to the net so everyone can see what is going on and allows for messaging on a world level • Balloons, mobile stations, weather events you want to track, using automated watch/warning data to transmit in your area.

What else can I do with APRS • Connect your weather station • DF abilites • track vehicles (balloons, trucks, space vehicles, hurricanes) • messages • Propagation, Prop. Net

Guy Story: W 8 XF baloon launch on 8. 3. 97. The X indicates max altitude achieved.

Digipeater does and don’ts

Other station tips • • What is my tnc deviation? The target is 3 k. Hz deviation Greatly improves channel throughput. Go to http: //www. febo. com/layerone/index. html for more data. • Open squelch? ? ? • Hidden and deaf transmitters

Credits • • Bob Bruninga, WB 4 APR TAPR Mark, KB 2 ICI and Keith, WU 2 Z, Sproul Brent Hilderbrand, KH 2 Z Steve Dimse, K 4 HG Mike Musick, N 0 QBF Rich Perry, W 9 IF John Ackerman, N 8 UR

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