Posts by DB2OS

  • Um welche Satelliten handelt es sich hier

    Hallo Robert,


    Nein - ist in beide Richtungen:


    Wird mittlerweile sehr häufig für kommerzielle Missionen genutzt, die im 435 MHz Amateursatelliten-Band eigentlich nichts zu suchen haben ;)


    73 de Peter

  • BLUEWALKER-3 & BLUEBIRD1-5 (AST)

    It would be good to collect interference and potential interference on those frequencies used by BlueBird 1-5. For sure someone will ask for it. A lot of people might even not be aware were it is originating from. For example Repeaters on 439.5 MHz or 430.5 MHz (Repeater input in UK).

    • 430.5 MHz
    • 432.3 MHz
    • 434.1 MHz
    • 435.9 MHz
    • 439.5 MHz

  • BLUEWALKER-3 & BLUEBIRD1-5 (AST)

    Yes, it's no secret that BlueWalker 3 was a NanoAvionics cubesat from Lithuania with a huge foldable antenna attached. These new satellites seem to be the same. They even use the same protocol on UHF.

    The reason they're preferring UHF instead of S-band for TTC is that they got zero complaints for requesting UHF. In S-band uplink you often get lots of complaints from NASA. You can see all the limitations they've gotten in this grant related to avoiding interference to NASA satellites.


    Reading the FCC grant carefully, it is clear that the UHF grant is only for communications with the 5 groundstations (all outside the US!!) listed at the end of the document. The grant doesn't allow continuous beaconing as they're doing!!

    The major point is that AST are transmitting over the US on UHF, which shows that they're even not at all following what the FCC grant says. Perhaps because they think nobody will observe and complain. In this respect, the FCC might want to find them or at least call them to order. ARRL/AMSAT-NA are the best to complain by providing evidence collected by SatNOGS because they're US entities.


    Even though doing TTC with 5 particular groundstations in amateur spectrum still seems unfair, continuously beaconing worldwide (and with a rather high duty cycle) is orders of magnitude worse.


    Observations using SatNOGS seem to be constantly beaconing, including inside the US (example: https://network.satnogs.org/observations/10234701/).


    It might be reasonable to fill in a complain with the FCC. Primarily though AMSAT NA and/or ARRL, but all other's like AMSAT-UK / RSGB, AMSAT-F, AMSAT-HB, DARC, etc.. should also act accordingly. AMSAT-DL is already in touch with DARC and IARU.


    It's strategically important for amateur radio, to act strong as a community in this case. If this slips without consequences, then it sets precedent for more cases of the same, whether it's all the future 243 AST satellites, or someone else's.

  • BLUEWALKER-3 & BLUEBIRD1-5 (AST)

    Quote from HB9SKA

    But the 70cm band is not exclusively reserved for amateur radio like the 2m band.


    Yes and No! There are "non-amateur-radio" satellites, but still "amateur" and non-commercial according to the ITU regulations.. (see thread above).




    However, BlueWalker and BlueBird satellites do not fall into any of the categories assigned to the 430 MHz - 440 MHz Band. Thus, they should not be there.. and even more funny, FCC allowed them only to transmit outside of US, as long as nobody complains..

    So not only satellites, but also EME, SSB and others will be affected too.. and this may only be the beginning and a forerunner of hundreds and thousands to follow, if nobody cares. And if ham radio community does not care, it probably deserves it..


    BTW: SpaceX Starlink satellites are using 137 MHz frequencies for a similar purpose. Why can't AST just do it like everyone else is doing?

  • BLUEWALKER-3 & BLUEBIRD1-5 (AST)

    IARU suggests that the interference should be individually be reported to the national administration and that the administration will hopefully submit a report of infringement or even better a report of harmful interference.

  • BLUEWALKER-3 & BLUEBIRD1-5 (AST)

    Satellites have been added in SatNOGS DB with transmitter based on bluewalker 3 one at 437.500 MHz.

    A TLE set has been generated to track them, it is not fully accurate but it should work for the first observations:


    Bluebird 5

    1 98800U 24256.37291667 .00000000 00000-0 50000-4 0 07

    2 98800 53.0000 22.1000 0010148 0.0000 22.3000 15.15323704 02

    Bluebird 4

    1 98801U 24256.37291667 .00000000 00000-0 50000-4 0 08

    2 98801 53.0000 22.1000 0010148 0.0000 22.3000 15.15323704 03

    Bluebird 3

    1 98802U 24256.37291667 .00000000 00000-0 50000-4 0 09

    2 98802 53.0000 22.1000 0010148 0.0000 22.3000 15.15323704 04

    Bluebird 2

    1 98803U 24256.37291667 .00000000 00000-0 50000-4 0 00

    2 98803 53.0000 22.1000 0010148 0.0000 22.3000 15.15323704 05

    Bluebird 1

    1 98804U 24256.37291667 .00000000 00000-0 50000-4 0 01

    2 98804 53.0000 22.1000 0010148 0.0000 22.3000 15.15323704 06

  • BLUEWALKER-3 & BLUEBIRD1-5 (AST)

    SpaceX just launched 5 Block 1 BlueBird satellites for AST’s constellation and like Bluewalker-3 they will transmit in the 435 MHz amateur satellite band.


    Although FCC confessed that the commercial 435 MHz TT&C operations do not fall within the ITU assigned classification for the amateur satellite service, they granted permission…


    See FCC extract below:


    Page 7:

    14. UHF Band. AST also seeks to conduct TT&C in the 430-440 MHz (space-to-Earth and

    Earth-to-space) band outside the United States, including for LEOP, with five satellites authorized in this

    grant. AST plans to perform such operations pursuant to agreements with authorized third-party teleport

    operators. The International Table of Frequency Allocations has allocations for amateur, radiolocation

    and Earth exploration-satellite services in the 430-440 MHz band. However, there is no relevant service classification for AST’s TT&C operations. Accordingly, AST submitted an interference analysis to demonstrate that it will not cause harmful interference to other operations in conformance with the ITU Radio Regulations. When operating in the 430-440 MHz band, AST shall not cause harmful

    interference to, and shall not claim protection from harmful interference caused by, a station operating in

    accordance with the ITU Radio Regulations. Furthermore, in the unforeseen and unlikely case that

    harmful interference occurs, AST confirms that it is capable of ceasing transmissions from its satellites as

    required under section 25.207 of the Commission’s rules, and consistent with notification of a non-

    conforming frequency use, which requires that any harmful interference be eliminated immediately. We

    conclude that AST’s demonstrations are sufficient to authorize a limited, non-conforming use, and

    therefore grant AST authority to conduct TT&C operations in the 430-440 MHz band with earth stations

    outside the United States, including during LEOP, subject to the laws, regulations, and requirements

    applicable to such operations in any foreign jurisdictions.


    Page 13:

    In its most recent amendment, AST requests to operate five additional satellites at a lower

    altitude and added requests to operate in the S-band and UHF band for TT&C during LEOP and

    emergency TT&C. Although submitting these additional requests could be considered a “major”

    mendment under our rules these requests do not create the potential for new or increased frequency

    conflicts, and AST does not seek to make any changes to its previously requested V-band operations.

    Also, no other processing round participants commented or expressed concern on AST’s request for an

    additional five satellites or TT&C frequencies.


    Page23: Groundstations

    UHF band: 430-440 MHz (Earth-to-space) (space-to-Earth)

    1. Wilde, Argentina
    2. Perth, Australia
    3. Vinogradets, Bulgary
    4. Knoll Fort, St. Helena
    5. Juju, South Korea

  • ERMINAZ-1V und ERMINAZ-1U

    Mehr Details auf unser Homepage:



    ERMINAZ-Mission auf 2025 verschoben
    Am Montagabend, den 19. August 2024 und nur wenige Wochen vor dem geplanten Starttermin von RFA One, mit der ERMINAZ-Nutzlast, führte die Rocket Factory…
    amsat-dl.org


    oder auf englisch:


    ERMINAZ mission postponed to 2025
    On Monday evening, August 19, 2024, just a few weeks before the planned launch date of RFA One with the ERMINAZ payload, Rocket Factory Augsburg (RFA)…
    amsat-dl.org

  • Ariane 6 gestartet (vorher: Ariane 6 Startmöglichkeit?)

    Quote from HB9SKA

    Erfolgte der Video-Downlink, so wie koordiniert, als DVB-S2-Stream auf 2440.0 MHz ? Dann werde ich YPSat natürlich in die Liste aufnehmen.


    Ja, wie oben beschrieben.. AMSAT-DL/Bochum war daran beteiligt..


    GENESIS-A hat das Problem, dass die Sendeleistung extrem eingeschränkt war: The effective radiated power of such transmissions is -8 dBm (75 uW). Daher wohl auch kein Wunder zu erwarten. Dies war eine Spezifikation/Vorgabe seitens des Launchers, um Störungen anderer Systeme zu minimieren.

  • Ariane 6 gestartet (vorher: Ariane 6 Startmöglichkeit?)

    YPSAT und GENESIS-A von AMSAT-EA fehlen noch in der Liste.
    siehe auch: https://www.facebook.com/amsat.deutschland


    With the collaboration of 11 ground stations across Europe and South America, the YPSat telecommunications team successfully recovered all the data necessary to achieve the mission's objectives.


    A special thanks from the YPSsat team to the Ground Station Operators that were with them throughout the mission:


    Peter Gülzow from AMSAT Deutschland
    Roberts Rasmanis from VIRAC
    Viljo Allik from University of Tartu
    Ferruccio Paglia in Turin
    Luis Cormier from Nottingham University
    Jaakko Yliaho from University of Vasaa
    Robin Schweigert from University of Stuttgart
    René Fléron and Hans Henrik Løvengreen from Technical University of Denmark
    Juan Jaramillo and Matías Campos Abad from Astralintu
    Giacomo Paialunga from University of Bologna
    Eric Martin from ESA ESEC

    External Content www.youtube.com
    Content embedded from external sources will not be displayed without your consent.
    Through the activation of external content, you agree that personal data may be transferred to third party platforms. We have provided more information on this in our privacy policy.