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Thread: Remote Ground Station (RGS) squitters

  1. #11
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    Quote 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 at 22:56.

  2. #12
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    Hi,

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

  3. #13
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    Quote 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.

  4. #14
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    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

  5. #15
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    Quote 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.

  6. #16
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    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.

  7. #17
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    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

  8. #18
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    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

  9. #19
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    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

  10. #20
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    Quote 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?

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