Beiträge von DB2OS

    Well my dish is movable from 58w to 53e so no problem at all to receive where it happens to be stationed :-)


    Same idea over here when I installed the dish in the summer... and it turned out to be a good idea to be able to check what's going on at 24°E before going to 26°E :)

    ..and who knows what will come after XMAS.. perhaps an Es'hail-3 ? :/;)

    Hi,


    I was also able to receive the EB and after some more tweaking this evening with my DiSEqC Motor to 24°E, I've got some nice signal on my 80cm dish with an unmodified Octagon Optima OSLO PLL Single LNB ..


    More stable than I thought and for someone who is used to a lot of Doppler shift from the LEO's, this frequency drift is no problem for the beginner (SSB) et all.


    It probably needs to be observed how the frequency will be under more severe weather conditions.



    (the frequency axis is 5 kHz per line, i.e. 30kHz between the sidebands with the carrier in the middle)

    So, don't worry if you haven't modified your LNB yet. I might do that later next year when the weather is better, but that's not urgent.. ;)


    73s Peter

    .. and there are definitely no beacons on that frequencies.. the beacons for the AMSAT P4-A transponders are generated on the ground as part of the LEILA-2 system ;-)


    These a most likely ghost signals at even multiples of internal references. 10450 MHz is integer multiple of 25 MHz.. same is 10500 MHz.

    Dear Christian,


    Thanks for your observations..


    Just to make sure.. did you made a sanity check, i.e. did the signal disappear when you moved the antenna a little bit to the left and right?

    At which °E Spot do you point the antenna?


    73s Peter

    I remember that Michael oh2aue received the EB from Es'hail-1 a while ago from Finland using a 1,20m dish and Funcube dongle..


    Since Es'hail-1 does not have a beam to Europe, I would assume the EB is coming from a dedicated more wide beam feed..


    Everything else would be under NDA which I signed for AMSAT-DL ;-)

    Absolutely Rob, the whole P4-A team is very excited and can't wait to see the first "real signals" coming down ;-) But we have still a lot of work ahead to install and test all our ground-station equipment for and with the AMSAT P4-A Transponders in the Es'hailSat Satellite Control Center in Qatar...


    Regarding the downlink, the DTH will have a completly different Antenna coverage than our AMSAT transponders.



    Thanks Allessio, well I think they share our enthusiasm and understand it very well.. but they also have their stakeholders which they have to serve first ;-)


    pe1chl Well, I believe the engineers (we meet them) are also very excited to turn the dials.. but the characterization of all parameters during the IOT Phase is very important for them too, also a mater of insurance and other things related to the commercial contract and agreed specification with the satellite manufacturer. One of the time consuming things they do is to make a full roll in both axes to measure the complete antenna pattern and so on.. calibrating thrusters for station keeping, etc.. so, they have a lot of work, not just simple "selftest" :-) But certainly different from how we do it after launch..

    Forgive me, Space-Track is the origin, the primary source of the Keplerian elements.

    But, then, what do you need to know exactly where is the satellite if the transponders are off?

    73, Lucio IØLYL


    in addition, Es'hail-2 is at a temporary position for the IOT Phase.. it shall move/drift than to the final position before the AMSAT transponders will be activated... so still plenty of time.. enjoy the Christmas season!

    Directly after the launch, which put Es'hail-2 in a highly elliptical orbit, the manufacturer MELCO in Japan made several orbit raising maneuvers to quickly bring the perigee out of earth atmosphere drag, than to further circularize the orbit and also reduce inclination. This took several days followed by unfolding of the solar panels, antennas and so on. Meanwhile Es'hail-2 should be close to a temporary parking position in GEO from where the In-Orbit-Testing will be performed. The IOT testing will be performed from the new Es'hailSat Teleport in Qatar.


    Try-out and opening of both AMSAT transponders is planned after the IOT phase is finished, we currently expect that this will not happen before January/February next year.


    Please understand that this is a multi-million commercial satellite and we are only a small part of it. As AMSAT we are not in a position to confirm any non-official in information as above. But obviously the new bird seems to be in good healthy ;-)


    As soon as we get information, we will publish this on our website.


    73s Peter

    The Falcon 9 rocket which will launch Es'hail-2 with the AMSAT P4-A payload on it was rolled out of SpaceX's hangar and up the ramp at pad 39A yesterday (Sunday).


    If the Static Test fire goes as planned today (Monday), the rocket will be rolled back to the hangar, with installation of the Es'hail-2 satellite, and returned to pad 39A in time for a launch window opening at 2046 UTC on Thursday.


    Live coverage is available from Spaceflight Now:

    https://spaceflightnow.com/201…-at-kennedy-space-center/

    Hi Rob,

    fully agreed !!

    Full Duplex operation should be mandatory when working satellites...

    Otherwise you will never be able to adapt your uplink power accordingly and you would not hear LEILA... I would even not have thought that someone would really consider simplex operation..

    Thanks for pointing this out, I will add this to the guidelines..

    73s Peter

    traditionally we always used the Downlink frequency on OSCAR's for such reports. That's where we hear the others and where we hear ourself, or the beacon.

    Operating via Es'hail-2 / P4-A will be very similar to operating OSCAR-10/13 or OSCAR-40 in apogee and there will be no Doppler shift on P4-A.

    However, if you have an unmodified LNB (without TCXO or external GPS reference) there might be large offsets in your received IF frequency... So others might not find you, unless users will "calibrate" the receive frequency using the actual upper/lower beacon frequency. Perhaps someone will write an SDR code which will automatically track the beacon while receiving other signals ;-)

    24/7 steht im Allgemeinen für die Verfügbarkeit:

    • 24 Stunden
    • 7 Tage die Woche


    24/7 generally stands for availability:

    • 24 hours
    • 7 days a week

    Dear All,


    Just as a reminder:


    ** We will not publish or discuss any launch dates for P4-A / Es'hail-2 in this in this AMSAT forum, unless the information is provided by an official source (directly from SpaceX or Es'hailSat) including a link to the original information **


    We also expect that it might take minimum 1-2 month after the launch, before the amateur radio transponders will be activated and available. Certainly other payloads on the spacecraft have higher priorities. ;-)


    Thanks for your understanding.