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Monitoring on HF
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DX-Torpet
Skåne
DXer:
Hermod Pedersen
CV: DXing since 1971, focusing on
Latin American radio stations. Have been president of the Swedish DX
Federation, and started its first Bulletin Board in 1990. Started the
Nordic Shortwave Center web site, later merged with HCDX.
Having retired, after 40 years in journalism, I now have more time for
radio adventures.
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Starting DXing
again, I need an online service to keep up with things. So this is a site
for my own pleasure, updated with what I want, when needed.
As I don't like Facebook, Instagram,
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HF
aircraft voice comms
Date: 9 Jan 2024
Dgital
Selective Calling, or DSC, can be used in the HF bands as well
as in VHF.
Standardized distress/emergency DSC frequencies are 4207.5, 6312,
8414.5, 12577, 16804.5 kHz.
There is a free DSC decoder available called YADD, Yet Another
DSC Decoder, somewhat of an analog to YAND for decoding NAVTEX
transmissions. Links to download YADD:
https://www.ndblist.info/datamodes.htm
https://www.ndblist.info/index_htm_files/YaDDSetup1_7_1.exe
For non-emergency
traffic, I believe aircraft use HFDL, or High Frequency Data Link,
in the HF bands. It is similar to ACARS used in the VHF band.
You can use MultiPSK to decode HFDL, but I tend to prefer PC-HFDL.
Here’s a link:
Free
PC-HFDL decoder
More info on the RTL-SDR feed regarding using PC-HFDL:
https://www.rtl-sdr.com/frugal-radio-hfdl-hf-acars-decoding-tutorial/
https://www.rtl-sdr.com/decoding-hfdl-acars-with-a-websdr-and-pc-hfdl/
You can pair up decoded HFDL messages with PlanePlotter, and show
plane locations like with ADSB.
There are a lot of HFDL frequencies between 2941 and 21997 kHz.
Here’s a link to a table for the various HFDL frequencies used
by the aeronautical ground stations that handle transoceanic flights
routes:
https://frugalradio.com/hfdl-resources/
Ken Sejkora -- WBØOCV -- on Airspy io.group
More
on HF aircraft voice comms
Date: 9 Jan 2024
Some air carriers use HFDL (High Frequency Data Link) which is HF
ACARS, similar to VHF ACARS but slower:
https://www.sigidwiki.com/wiki/High_Frequency_Data_Link_(HFDL)
For reference,
VHF ACARS is 2400Bd via the aircraft's VHF AM transceivers.
Boeing uses the #3 VHF for ACARS, but can be used for voice comms
if needed.
The B777 would use VHF when w/in range of ACARS ground stations,
then switch over to SATCOM as we went oceanic, and if that failed
(polar regions) HFDL would be used.
So for HF Aeronautical you have voice comms or HFDL.
Kriss Kliegle -- KA1GJU -- on Airspy io.group
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