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new file: A-Better-APRS-Packet-Demodulator-Part-1-1200-baud.pdf new file: A-Better-APRS-Packet-Demodulator-Part-2-9600-baud.pdf modified: APRStt-Implementation-Notes.pdf modified: CHANGES.txt new file: Makefile modified: Makefile.linux modified: Makefile.win deleted: Quick-Start-Guide-Windows.pdf modified: Raspberry-Pi-APRS-Tracker.pdf modified: Raspberry-Pi-APRS.pdf modified: User-Guide.pdf modified: aclients.c modified: aprs_tt.c modified: aprs_tt.h modified: atest.c modified: audio.c modified: audio.h modified: audio_win.c modified: ax25_pad.c modified: ax25_pad.h modified: beacon.c modified: beacon.h modified: config.c modified: config.h modified: decode_aprs.c modified: decode_aprs.h modified: demod.c modified: demod.h modified: demod_9600.c modified: demod_9600.h modified: demod_afsk.c modified: digipeater.c modified: digipeater.h modified: direwolf.c modified: direwolf.conf deleted: direwolf.desktop modified: direwolf.h new file: direwolf.spec new file: direwolf.txt new file: dlq.c new file: dlq.h modified: dsp.c new file: dtime_now.c new file: dtime_now.h modified: dtmf.c modified: dtmf.h new file: dwespeak.bat new file: dwespeak.sh modified: fsk_demod_state.h modified: gen_packets.c modified: gen_tone.c new file: geotranz/README-FIRST.txt new file: geotranz/error_string.c new file: geotranz/error_string.h new file: geotranz/mgrs.c new file: geotranz/mgrs.h new file: geotranz/polarst.c new file: geotranz/polarst.h new file: geotranz/readme.txt new file: geotranz/releasenotes.txt new file: geotranz/tranmerc.c new file: geotranz/tranmerc.h new file: geotranz/ups.c new file: geotranz/ups.h new file: geotranz/usng.c new file: geotranz/usng.h new file: geotranz/utm.c new file: geotranz/utm.h modified: hdlc_rec.c modified: hdlc_rec.h modified: hdlc_rec2.c modified: hdlc_rec2.h modified: hdlc_send.c modified: igate.c modified: igate.h modified: kiss_frame.c modified: kiss_frame.h modified: kissnet.c modified: latlong.c modified: latlong.h modified: ll2utm.c modified: log.c modified: log.h new file: man1/aclients.1 new file: man1/atest.1 new file: man1/decode_aprs.1 new file: man1/direwolf.1 new file: man1/gen_packets.1 new file: man1/ll2utm.1 new file: man1/log2gpx.1 new file: man1/text2tt.1 new file: man1/tt2text.1 new file: man1/utm2ll.1 modified: multi_modem.c modified: multi_modem.h new file: pfilter.c new file: pfilter.h modified: ptt.c modified: ptt.h deleted: pttest.c modified: rdq.c new file: recv.c new file: recv.h modified: redecode.c modified: redecode.h modified: rrbb.c modified: rrbb.h modified: server.c modified: server.h modified: telemetry.c modified: telemetry.h modified: textcolor.c modified: textcolor.h modified: tocalls.txt modified: tq.c modified: tq.h modified: tt_text.c modified: tt_text.h modified: tt_user.c modified: tt_user.h new file: ttcalc.c deleted: udp_test.c deleted: utm/LatLong-UTMconversion.c deleted: utm/LatLong-UTMconversion.h deleted: utm/README.txt deleted: utm/SwissGrid.cpp deleted: utm/UTMConversions.cpp deleted: utm/constants.h modified: utm2ll.c modified: version.h new file: xid.c modified: xmit.c modified: xmit.h
87 lines
2.3 KiB
Groff
87 lines
2.3 KiB
Groff
.TH DECODE_APRS 1
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.SH NAME
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decode_aprs \- Convert APRS raw data to human readable form.
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.SH SYNOPSIS
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.B decode_aprs
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[ \fItext-file\fR ]
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.RS
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.P
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\fItext-file\fR should contain AX.25 packets in the standard monitoring format.
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If no file specified, data will be read from stdin.
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.P
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.RE
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.SH DESCRIPTION
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\fBdecode_aprs\fR is useful for understanding sometimes obscure APRS packets and finding errors.
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.SH OPTIONS
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None.
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.SH EXAMPLES
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You see something like this show up on your screen:
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.P
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.RS
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M0XER-3>APRS63,WIDE2-1:!/4\\;u/)K$O J]YD/A=041216|h`RY(1>q!(|
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.RE
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.P
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What does it mean? If you haven't spent a lot of time studying the APRS protocol
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specification, most of it probably looks like random noise.
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Pipe it into decode_aprs to find out.
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.P
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.RS
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.B echo 'M0XER-3>APRS63,WIDE2-1:!/4\\\\;u/)K$O J]YD/A=041216|h`RY(1>q!(|' | decode_aprs
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.RE
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.P
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http://www.findu.com/cgi-bin/errors.cgi has a never-ending collection of packets
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with errors. Sometimes it's not obvious what is wrong with them.
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Dire Wolf will usually tell you what is wrong. First,
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cut-n-paste the bad packets into a text file. Here a couple examples:
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.P
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.RS
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n2cma>APRS,TCPIP*,qAC,SEVENTH:@212127z43.2333n/77.1w_338/002g001t025P000h65b10208.wview_5_19_0
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.P
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K0YTH-10>APNU3B,NULL,qAR,K0DMF-10:!4601.5NS09255.52W#PHG6360/W2,MNn 444.575
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.RE
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.P
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If you simply fed this into decode_aprs, it would complain about the
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lower case in qA-something, added by the IGate, in the via path.
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We can take it out with something like this:
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.P
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.RS
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.B cat findu-errors.txt | sed -e 's/,qA.*:/:/' | decode_aprs
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.RE
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.P
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In the first case, we get,
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.P
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.RS
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Address has lower case letters. "n2cma" must be all upper case.
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.RE
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.P
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After changing the source address to upper case, there are other issues. Identifying them is left as an exercise for the reader.
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.P
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And in the second example,
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.P
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.RS
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.PD 0
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Invalid character in latitude. Found 'N' when expecting 0-9 for hundredths of minutes.
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.P
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Invalid character in longitude. Found '9' when expecting 0 or 1 for hundreds of degrees.
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.PD
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.RE
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.SH SEE ALSO
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More detailed information is in the pdf files in /usr/local/share/doc/direwolf, or possibly /usr/share/doc/direwolf, depending on installation location.
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Applications in this package: aclients, atest, decode_aprs, direwolf, gen_packets, ll2utm, log2gpx, text2tt, tt2text, utm2ll
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