Re: HFDL data

Paul Gulliver
 

Taking the flight identifier in the second batch of data, according to Flight Aware AS0988 is a Boeing 737-800 reg'd N597AS from Kona to Seattle

I don't receive HFDL so I can't help you with any other details

Paul


On 28/08/2019 at 00:30, Thomas Kramer <tkramer@...> wrote:
A newcomer to  HFDL.  been monitoring some.  I decoded this:

<300 bps 1.8 sec 1429 Hz>    08/27/2019 23:24:04
MPDU CRC control: OK
MPDU (Media access control Protocol Data Unit) - Downlink
00 Ground Station Identifier: 2 - Molokai, HAWAII, USA (157-10-46W 21-10-47N)     Synchronized to UTC time
01 Aircraft Identifier: 255
02 Number of medium priority slots: 0    Low priority slots: 0
03 Uplink data rate: 300 bits/s    U(R): 0    LPDU [ U(R) Vect + 1..8 ]: 00000000
04 Number of LPDU: 1      LPDU Sizes: 39
LPDU CRC control: OK
<End frame>
  Does this mean it is from a plane to the Ground station?  I see there is an aircraft ID number is there a way to know what plane it is?   OR is it just the ground station IO decode?

I assume this is from ground to air:
Unnumbered Data LPDU] [Performance data HFNPDU] 
UTC time: 23:28:06 UTC   Flight identifier: AS0988   Latitude: 33-54.01N   Longitude: 143-57.25W
Performance version: 10   "Flight leg"': 8
Ground Station Identifier: 2 - Molokai, HAWAII, USA (157-10-46W 21-10-47N)
Frequency number: 3 (13324.0 KHz) 
Previous frequency search count: 16
Current frequency search count: 15
Previous HF data disabled time: 6252 sec
Current HF data disabled time: 234 sec
MPDUs received without error: 0 (1800 bps) / 0 (1200 bps) / 3 (600 bps) / 28 (300 bps)
MPDUs received with errors: 0 (1800 bps) / 0 (1200 bps) / 0 (600 bps) / 0 (300 bps)
SPDUs received without error: 72
SPDUs received with errors: 2
MPDUs transmitted: 0 (1800 bps) / 3 (1200 bps) / 1 (600 bps) / 2 (300 bps)
MPDUs delivered: 0 (1800 bps) / 3 (1200 bps) / 1 (600 bps) / 2 (300 bps)
No frequency change since the last "performance data" HFNPDU
<End frame>
  Thanks for reading my novice question
Tom NQ7R AZ

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