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Update README again

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Tom Swartz 2016-10-17 11:13:27 -04:00
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README.md
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@ -13,13 +13,15 @@ To receive ACARS you need at least an AM VHF air band receiver tuned to one of t
- 131.550 USA primary - 131.550 USA primary
- 130.025 USA secondary - 130.025 USA secondary
- 131.450 Japan primary - 131.450 Japan primary
(these are the most common, google is your friend for other frequencies)
(These frequencies are the most common, Google is your friend for other frequencies)
Audio output from this receiver is send to the soundcard input of your PC under Linux. Audio output from this receiver is send to the soundcard input of your PC under Linux.
Then, acarsdec will demodulate the signals sent by aircrafts and print the received messages on its standart output in airnav log text format. Then, acarsdec will demodulate the signals sent by aircrafts and print the received messages on its standart output in airnav log text format.
## BUILDING IT ## BUILDING IT
On a Linux system, you will need libsnd librairy, alsa audio system and gcc/make installed. On a Linux system, you will need libsnd librairy, alsa audio system and gcc/make installed.
Then just type: Then just type:
`make` `make`
@ -41,6 +43,7 @@ Typical usage for realtime decoding is :
Be sure that correct record level is set for the used soundcard input. Be sure that correct record level is set for the used soundcard input.
For testing, you could try to record your receiver output at 48khz sampling frequency with any audio recording tool. For testing, you could try to record your receiver output at 48khz sampling frequency with any audio recording tool.
Save as wav file, then decode it by: Save as wav file, then decode it by:
`acarsdec -f audiofile.wav` `acarsdec -f audiofile.wav`
@ -55,16 +58,19 @@ PS: position decoding is in experimental stage. Mail me if you find errors or la
start acarsdec with the following option : start acarsdec with the following option :
`acarsdec -d hw:0 -s 14000` `acarsdec -d hw:0 -s 14000`
Then in xastir, choose : Interface->Interface Control->Add Then in xastir, choose:
Select : Internet Server, then Add - Interface → Interface Control → Add
Set Host at 127.0.0.1, Port 14000, Don't allow transmitting, then Ok. - Select: Internet Server, then Add
- Set Host at 127.0.0.1, Port 14000, Don't allow transmitting, then Ok.
This will add an interface in the Interface Control dialog. This will add an interface in the Interface Control dialog.
Then select this interface and press start. Then select this interface and press start.
To check that acarsdec send messages to xastir, select View->Incoming traffic To check that acarsdec send messages to xastir, select View→Incoming traffic
ACARS messages look like that in xastir: ACARS messages look like that in xastir:
```
F-XXYZ>ACARS:>Fid:AFXXXX Lbl:Q0 F-XXYZ>ACARS:>Fid:AFXXXX Lbl:Q0
```
Lots of ACARS messages are messages without position report, so be patient before seeing aircraft plotted on the map. Lots of ACARS messages are messages without position report, so be patient before seeing aircraft plotted on the map.