Difference between revisions of "HFDL"
From The RadioReference Wiki
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This topic can be discussed in our | This topic can be discussed in our | ||
[http://forums.radioreference.com/shortwave-data-decoding SW Data Decoding] forum. | [http://forums.radioreference.com/shortwave-data-decoding SW Data Decoding] forum. | ||
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| + | ==Current Usage== | ||
| + | This mode is utilized exclusively by fixed aeronautical stations in communications with planes, often at great distances - too far for VHF radio to accomplish. See the Related Links section for a link to a list of frequencies and sites. | ||
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===PC-HFDL=== | ===PC-HFDL=== | ||
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The HFDL Yahoo group can be found [http://groups.yahoo.com/group/hfdl/ here]. Version 2.042 can be downloaded from this stub [http://www.chbrain.dircon.co.uk/ page] | The HFDL Yahoo group can be found [http://groups.yahoo.com/group/hfdl/ here]. Version 2.042 can be downloaded from this stub [http://www.chbrain.dircon.co.uk/ page] | ||
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=== Other software that can decode HFDL === | === Other software that can decode HFDL === | ||
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*The current version (Sept. 5 2014) of the HFDL database table is 49. It's available from the UDXF Modes page [http://www.udxf.nl/HFDL-ACARS-VDL2.pdf here] in PDF. | *The current version (Sept. 5 2014) of the HFDL database table is 49. It's available from the UDXF Modes page [http://www.udxf.nl/HFDL-ACARS-VDL2.pdf here] in PDF. | ||
*The .dat file that can be used with the registered version of PC-HFDL can be had by joining the PC-HFDL Yahoo group and requesting one via private mail. It will NOT work with the free version. | *The .dat file that can be used with the registered version of PC-HFDL can be had by joining the PC-HFDL Yahoo group and requesting one via private mail. It will NOT work with the free version. | ||
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* [http://www.wavecom.ch/content/ext/decoder-online-help/default.htm#!worddocuments/hfacars.htm Wavecom HF-ACARS Description] | * [http://www.wavecom.ch/content/ext/decoder-online-help/default.htm#!worddocuments/hfacars.htm Wavecom HF-ACARS Description] | ||
* [http://www.shoc.ch/manuals/nethelp_go2m/index.html#!hfdl.htm go2Monitor HFDL Description] | * [http://www.shoc.ch/manuals/nethelp_go2m/index.html#!hfdl.htm go2Monitor HFDL Description] | ||
Revision as of 12:16, 4 March 2015
Contents
What is HFDL?
HFDL is a HF data link protocol, defined in ARINC spec 635-3. The HFDL service is operated by Rockwell Collins (since 2014) through a worldwide network of HF stations. See this PDF file from the UDXF for more.
- Transmissions on HF are in USB on a sub carrier of 1440 Hz with a symbol speed of 1800 baud.
- Modulation is 2-PSK, 4-PSK or 8-PSK with effective bit rates of 300, 600, 1200 or 1800 bits/sec.
This topic can be discussed in our SW Data Decoding forum.
Current Usage
This mode is utilized exclusively by fixed aeronautical stations in communications with planes, often at great distances - too far for VHF radio to accomplish. See the Related Links section for a link to a list of frequencies and sites.
Synonyms
- HF ACARS
Decoders
PC-HFDL
PC-HFDL is a Windows software to decode HFDL data traffic and has been written by Charles Brain. Just feed the HF receiver speaker's output into the soundcard of a Windows PC. It can be downloaded from the HFDL Yahoo group.
The best monitoring results will be achieved with the following PC-HFDL settings:
- PREAM ON - to control the audio offset of the receiver
- SPDU OFF - only needed temporarily ON to see the squitters of a new unknown ground station
- MPDU ON - see the MPDU packets
- LPDU ON - see the LPDUs within the MPDUs
- BDU ON - see the BDUs
- VERB ON - see more details
- HFNPDU ON - see the routine position reports
- HEX OFF - only needed for debugging purposes
So in short, with all options ON except SPDU and HEX, the complete session can be seen: LOG-ON of the aircraft to the ground station giving its 24bit ICAO-ID, the assignment of the 1byte sequence ID number to the given ICAO-ID by the ground station referenced in all subsequent traffic, clear distinction of MPDU packets containing more than just one LPDU, and full traffic details.
The HFDL Yahoo group can be found here. Version 2.042 can be downloaded from this stub page
Other software that can decode HFDL
- Hobby Level Software
- Hoka Code 3-32P
- Hoka Code 300-32P
- MultiPSK
- PlanePlotter (Not a decoder but will show aircraft decoded by PC-HFDL)
- Sigmira
- Skysweeper (Discontinued by manufacturer)
- Sorcerer
- Note: It has been recently discussed on the UDXF Yahoo group that Sorcerer is using an old freq/site list - you may get correct decodes, but not correct site IDs
- Professional Equipment/Software
- go2decode
- Hoka 300-32
- Krypto 500
- Many of the newer WaveCom modems
- Wavecom W-Code
Audio Example and Waveform
- See this entry from the Signals Indentification wiki
- HFDL Waveform
Related Links
- The current version (Sept. 5 2014) of the HFDL database table is 49. It's available from the UDXF Modes page here in PDF.
- The .dat file that can be used with the registered version of PC-HFDL can be had by joining the PC-HFDL Yahoo group and requesting one via private mail. It will NOT work with the free version.
- Wavecom HF-ACARS Description
- go2Monitor HFDL Description