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  • digitizing
    replied
    -=[ Squitter message ]=-

    ACARS Mode: s Aircraft reg: _______
    Message Label: SQ Block ID: [Uplink]
    Message content:-
    00XS
    ----------------------------------------------------------[16/11/2017 11:05]-

    Heard near Juanda Airport ( WARR ) , Surabaya, Indonesia on 131.55
    It seems from SITA ground station

    Leave a comment:


  • digitizing
    replied
    ACARS Mode: 2 Aircraft reg: _______
    Message Label: SQ Block ID: [Uplink]
    Message content:-
    01XASUBKSUB1ARINC
    ----------------------------------------------------------[16/11/2017 10:46]-

    Heard near Juanda Airport ( WARR ) , Surabaya, Indonesia on 131.45
    It seems from ARINC ground station

    Leave a comment:


  • mxpvn
    replied
    ACARS mode: e Aircraft reg:
    Message label: SQ Block id: [Uplink]
    Message content:-
    02XS JER EGJJ 0 4912N 00211W

    Leave a comment:


  • Peter1066
    replied
    I guess this the information relating to the ground station "Source address (hexa): 219D18 (Ground Station, delegated address , command frame)" so very different from the regular ground station Squitter as this one from London Stansted on 131.975 MHz logged here. By the way I use a Multipsk decoder for both ACARS and VDL2


    20/03/15 10:05:33 UTC
    Mode: e Identifier: Ack.: {NAK}
    Message type: SQ
    Block:
    Message: 02XS STN EGSS 05153N00014E V136975/

    Leave a comment:


  • daniales
    replied
    Originally posted by Peter1066 View Post
    Hi forum,

    Have been getting used to monitoring VDL2 on 136.975. There sure is lots of messages per minute compared with regular ACARS
    I am trying to see some ground stations - can anyone say whether they use a similar format as on ACARS?

    I have received this kind of message that I think is squitter. There is a mistake on coordinates because this is not Sao Paulo!

    05/04/15 10:18:09 UTC
    Broadcast address (hexa): FFFFFF (All aircraft)
    Source address (hexa): 219D18 (Ground Station, delegated address , command frame)
    XID (Exchange Identification) frame F=0
    Data (hexa): 828000140109383838353A3139393302020001030320A488F0 001F000156040120C10453425350C406000000000000C50494 000000C80303EFA6
    Public parameters:HDLC public parameter: 8885:1993
    Classes of procedures (hexa): 0001
    HDLC functions (hexa): 20A488
    Private parameter set identifier: V
    AVLC specific options parameter (hexa): 20
    Airports covered by the ground station: SBSP SAO PAULO/CONGON (BRAZIL)
    ATN router nets:
    * ADM identifier (hexa): 000000 User field (hexa): 000000
    Station operator mask (address) (hexa): 200000
    Ground station (+/- 3'): 0612'N 00900'W

    Leave a comment:


  • Peter1066
    replied
    Originally posted by Peter1066 View Post
    More monitoring of Remote Ground Stations(RGSs) over past week on 131.725 Mhz has revealed
    CDG Paris: London Stansted: Zurich: Saarbrucken: Geneva: Brussels: Birmingham: Toulouse: and Norwich.
    Plus the unknown ? below which gives no ICAO/IATA/coordinates/freq information

    23/03/15 16:13:04 UTC
    Mode: g Identifier: Ack.: {NAK}
    Message type: SQ
    Block:
    Message: 00XS
    Hi forum,

    Have been getting used to monitoring VDL2 on 136.975. There sure is lots of messages per minute compared with regular ACARS
    I am trying to see some ground stations - can anyone say whether they use a similar format as on ACARS?

    Leave a comment:


  • daniales
    replied
    ACARS mode: b Aircraft reg:
    Message label: SQ Block id: Msg. no: 02XB Flight id: CGHSBS
    Message content:-
    P02337S04639WV136975/
    ----------------------------------------------------------[29/03/2015 15:01

    In SBSP - Brazil 131.550 Mhz

    Leave a comment:


  • Peter1066
    replied
    More monitoring of Remote Ground Stations(RGSs) over past week on 131.725 Mhz has revealed
    CDG Paris: London Stansted: Zurich: Saarbrucken: Geneva: Brussels: Birmingham: Toulouse: and Norwich.
    Plus the unknown ? below which gives no ICAO/IATA/coordinates/freq information

    23/03/15 16:13:04 UTC
    Mode: g Identifier: Ack.: {NAK}
    Message type: SQ
    Block:
    Message: 00XS

    Leave a comment:


  • Peter1066
    replied
    Managed to getfollowing 3 SQ uplink messages on 131.725 - out of approx 18000 - so not easy from this location. I see one is CDG Paris, about 160 miles from here but don't know where 00XS is. I guess there maybe a list of SQ IDs somewhere? Nearest to me is Gatwick (00XS?) about 40 miles.
    Interesting, maybe when there are VHF "lifts" it will be possible get further

    13/03/15 18:23:57 UTC
    Mode: x Identifier: Ack.: {NAK}
    Message type: SQ
    Block:
    Message: 00XS


    14/03/15 08:36:36 UTC
    Mode: g Identifier: Ack.: {NAK}
    Message type: SQ
    Block:
    Message: 02XS CDG LFPG 04901N00233E V136975/


    14/03/15 20:24:42 UTC
    Mode: e Identifier: Ack.: {NAK}
    Message type: SQ
    Block:
    Message: 00XS

    Leave a comment:


  • Peter1066
    replied
    No problem, thanks for all the tips. I have been listening to the audio(Airport Ops) on 131.550 and a little ACARS activity noted there but no uplinks.

    Getting late so will have a play with agc/bandwidth etc tomorrow.

    Cheers for now.

    Leave a comment:


  • glyptodon
    replied
    Originally posted by Peter1066 View Post
    Yes I understand that - what I mean is which of the usual ACARS frequencies - I have been monitoring 131.725 for past couple of hours and only one Uplink SQ so far is below. Not sure where it is? I'm located near to Hastings. Appreciate the help.

    13/03/15 18:23:57 UTC
    Mode: x Identifier: Ack.: {NAK}
    Message type: SQ
    Block:
    Message: 00XS
    Sorry, I've managed to quite comprehensively misunderstand you. I'm near Zurich and get the most traffic on 131.725 and 131.525. Sometimes 131.825 pipes up as well. Uplink traffic is tough to get though if you are not near a transmitter as it sends most of its power upwards. I'm about 10 miles from the transmitter but its signal is far weaker than the aircraft.

    You could also try: 131.550, 131.850, 136.750 and 136.925.

    Switch off AGC and try to find a good setting for gain and bandwidth with your ears and an audio card before using dump1090 or other tools. It should be nice and quiet static with clearly audible squits during data transfer.

    Leave a comment:


  • Peter1066
    replied
    Yes I understand that - what I mean is which of the usual ACARS frequencies - I have been monitoring 131.725 for past couple of hours and only one Uplink SQ so far is below. Not sure where it is? I'm located near to Hastings. Appreciate the help.

    13/03/15 18:23:57 UTC
    Mode: x Identifier: Ack.: {NAK}
    Message type: SQ
    Block:
    Message: 00XS

    Leave a comment:


  • glyptodon
    replied
    Originally posted by Peter1066 View Post
    Hi,

    Which frequency(or is it various ones) - do you generally receive the "Uplink" squitters on ?
    Peter, the uplink and downlink are on the same frequency, just like with voice comms, because the ACARS system was originally designed to actually use the voice radio.

    Leave a comment:


  • Peter1066
    replied
    Hi,

    Which frequency(or is it various ones) - do you generally receive the "Uplink" squitters on ?

    Leave a comment:


  • The Sage of Milton
    replied
    Originally posted by glyptodon View Post
    What kind of antenna are you using, if you don't mind me asking?
    It's a home-made half-wave dipole, cut for 130Mhz. Each leg of the dipole is 21.5"
    Cost? Negligible. It was made of of two old wire coat-hangers which I straightened out and then cut to length.
    Last edited by The Sage of Milton; 2014-05-23, 22:56.

    Leave a comment:

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