HFDL "errors"


Andrew OBrien
 

I decided to monitor some HFDL traffic today.  What is the following telling me ?


<300 bps 1.8 sec 1441 Hz>    12/25/2020 16:11:35MPDU CRC control: error
<End frame>
 
<300 bps 1.8 sec 1444 Hz>    12/25/2020 16:11:52
MPDU CRC control: OK
MPDU (Media access control Protocol Data Unit) - Uplink
LPDU CRC control: OK
[Unnumbered Data LPDU] [Enveloped Data HFNPDU] 
<SOH>2.N123FE6_<DEL>D<ETX>S`<DEL>
<End frame>
 
<300 bps 1.8 sec 1440 Hz>    12/25/2020 16:12:02
MPDU CRC control: OK
MPDU (Media access control Protocol Data Unit) - Downlink
LPDU CRC control: OK
[Unnumbered Acknowledged Data LPDU] [Enveloped Data HFNPDU] 
<SOH>2.N123FE<NAK>SA7<STX>M82AFX00000EH1611532SH<ETX><ACK>3<DEL>
<End frame>
 
<300 bps 1.8 sec 1443 Hz>    12/25/2020 16:12:07
SPDU CRC control: OK
SPDU (Squitter Protocol Data Unit)
<End frame>
 


Patrick Lindecker
 

Hello Andrew,

 

Mainly positions are interesting for the users.  Apart to weather messages, the meaning of other messages is unknow (at least for me).

Push the “Expl./Weather” to have some the known explanations.

For more details (about planes for example), note that the HFDL-Display utility (freeware) by Mike Simpson may be of use to MultiPSK users. This one, in interface with Multipsk, displays details of the aircraft heard, current freqs in use etc. Interested users can get details then download the program at the WEB address:
http://www.agenetools.com/downloads/Display-Launcher.pdf

73

Patrick

 

De : multipsk@groups.io [mailto:multipsk@groups.io] De la part de Andrew OBrien
Envoyé : vendredi 25 décembre 2020 17:15
À : multipsk@groups.io
Objet : [multipsk] HFDL "errors"

 

I decided to monitor some HFDL traffic today.  What is the following telling me ?

<300 bps 1.8 sec 1441 Hz>    12/25/2020 16:11:35MPDU CRC control: error

<End frame>

 

<300 bps 1.8 sec 1444 Hz>    12/25/2020 16:11:52

MPDU CRC control: OK

MPDU (Media access control Protocol Data Unit) - Uplink

LPDU CRC control: OK

[Unnumbered Data LPDU] [Enveloped Data HFNPDU] 

<SOH>2.N123FE6_<DEL>D<ETX>S`<DEL>

<End frame>

 

<300 bps 1.8 sec 1440 Hz>    12/25/2020 16:12:02

MPDU CRC control: OK

MPDU (Media access control Protocol Data Unit) - Downlink

LPDU CRC control: OK

[Unnumbered Acknowledged Data LPDU] [Enveloped Data HFNPDU] 

<SOH>2.N123FE<NAK>SA7<STX>M82AFX00000EH1611532SH<ETX><ACK>3<DEL>

<End frame>

 

<300 bps 1.8 sec 1443 Hz>    12/25/2020 16:12:07

SPDU CRC control: OK

SPDU (Squitter Protocol Data Unit)

<End frame>