Es'hail-2 beacon frequency (non-amateur)

  • Some tests in GG77 Resende - Rio de Janeiro.

    120cm dish + LNB Avenger PLL 321 + RTL.


    PY1SAN

    73 !

    Congratulations!!! Looks really nice...

    If I counted correctly, we will have at least 3 operators from Brazil

    PY1SAN, PY2SDR, PY4ZBZ :-)

    Meanwhile our JAMSAT friends are supporting RAST Thailand to install a P4-A station at the RAST headquarter at the Bangkok University which they hope to have ready by March.

    Lot's of DX expected-- from Brazil to Thailand.. :-)


    Peter Gülzow | DB2OS | AMSAT-DL President | member since 1983 | JO42VG

  • PY1SAN :

    Nice duoband-solution. The RX seems to work very well.

    Did you test the Helix feed (of course NOT in direction to 26E ;-)) ) - is there interference of the TX-signal on 2,4 GHZ with the reception of the LNB ? What about the loss in gain because of the helix-feed is "to close" to the dish and not really in the focus ?


    Any information and data would be appreciated.


    73 de Johannes, DL5RDI


    P.s. thanks to Heiner for posting the Youtube-Video !!

  • According to the literature, the phase centre of a helix is located very close to the reflector plate of the helix, so having the downconverter looking through a hole in the reflector plate should be OK.


    The helix will cause some blockage on receive, but probably not enough to cause a problem. I have a similar feed with 2.25 turns for a prime focus dish and it seems to be working fine on receive.

  • @DL5RDI

    Thanks for your comment. Probably i will test TX this week (with dish other direction). I don't have some basics equipments to measurement 2400mhz. However i also believe that i will have an big desense or saturate my LNB.

    I will test with 5 watts.


    73 !

    PY1SAN

    GG77 Resende

    Rio de Janeiro.

  • Hello all,


    I am a bit confused about the polarisation of the two beacons. I set my 1.4m prime focus antenna up a week or so ago and couldn't get a decent polarisation adjustment on the 10706MHz beacon so I used one of the TV muxes instead to achieve an approximate setting. For the last week I've been seeing the 10706MHz beacon with a S/N of about 38dB and the 11200.5MHz beacon with S/N of about 18dB so I assumed I had some cross-pol still. Today however I'm seeing 11200.5MHz with S/N of 38dB the same as the 10706MHz beacon, although today the higher one has modulation at +/-15KHz and the lower one does not. So, are they linear or circular, or is it just a case of spacecraft manoeuvring or power level changes?


    73 Chris G4SDG

  • Dear All,


    Made my first reception attempts and looks like got the 11205 MHz beacon (Hungary, Budapest). I see something on the 10706 MHz part as well but suspicious that not seeing side bands (may just my signal too weak?). It was a fun to me as my first Ku band SAT dish adventure :) Satellite AR android helped me but still was not easy. Using an old, abandoned and rusty analog sat TV dish, Inverto universal LNB, DIY bias tee + Signal Hound (later RTL-SDR V3 and OpenWebRX live stream)

    73,
    Zoltan




  • Dear All,


    Made my first reception attempts and looks like got the 11205 MHz beacon (Hungary, Budapest). I see something on the 10706 MHz part as well but suspicious that not seeing side bands (may just my signal too weak?).

    When you see signals but not the expected patterns or only one of the two, you are likely pointed to the wrong satellite. This can easily happen as other satellites used beacons on almost the same frequencies, and are located e.g. at 31.5e and 19.2e.

    It is easier when you have a DVB-S(2) receiver as you can verify the satellite you are pointed to by checking the TV programmes you receive.

    When you are checking from Europe (i.e. not from the target area of these satellites) you cannot receive most programmes, but e.g. on 11996 MHz Horizontal 27.5MS/s 3/4 FEC you can receive a strong transponder with Arabic versions of news programmes. This is not from Es'hail-2 but from another Arabsat at 26e.

  • I've been using a Funcube Pro dongle and SDR-Sharp which seems to limit my visible bandwidth to ~+/-75KHz but when I checked with an analyser I can see sidebands on both beacons at ~+/-250KHz but only the additional sidebands at +/-15KHz on the 11205.5MHz beacon at the moment.


    73 Chris G4SDG

  • I've been using a Funcube Pro dongle and SDR-Sharp which seems to limit my visible bandwidth to ~+/-75KHz but when I checked with an analyser I can see sidebands on both beacons at ~+/-250KHz but only the additional sidebands at +/-15KHz on the 11205.5MHz beacon at the moment.

    That is correct. The 15kHz sidebands are not always there and at the moment they only appear on 11205 and not on 10706 but this can also be the other way around.

    The 250 and 500 kHz sidebands are always there.

    Of course even with a Funcube you should be able to see them by tuning around, just not in a single picture as with the RTL-SDR or other SDR receivers that can sample at 1 or 2 MS/s.

  • The beacons are RHCP. So not suitable to set the skew angle of your LNB.

    .. and don't get confused: These beacons have nothing to do with the AMSAT transponder NB and WB downlink.. different antennas as well..


    We still have to wait a few weeks more...

    Peter Gülzow | DB2OS | AMSAT-DL President | member since 1983 | JO42VG