Beiträge von DH2VA

    Thank you all for a mostly well behaved day 1!

    Please send in user reports with the following information (if available):

    • RX antenna diameter
    • NB noise floor increase
    • TX antenna diameter
    • SSB RF power


    We are trying to determine the useful uplink power as some stations are using way too much of it. This will help us in fine tuning the settings and improve performance for all.


    73 de Doha!

    Achim DH2VA


    PS: we are getting any news out as fast as we can but we are only three persons here (DB2OS, DG5NGI and myself) and we can either work or post.. :)

    As mentioned, the aluminum plane is close to the helix but not touching it and serves as a matching element together with the coppler fane soldered to the center conductor of the N socket. Not fully optimized (you are looking at the engineering model so to speak), we have four 'flight models' which are nicer looking, fully tuned up and distributed to the involved persons. If I understood DL5MLO correct, return loss at 2.4 GHz is in excess of 20 dB.

    Another helix feed. Design by DJ4ZC, CAD and construction by DH2VA and final alignment by DL5MLO. If enough people believe, that the construction is compatible with hamradio, we could do another journal article..



    Hi Chris, and welcome to the Forum!

    Some more info: DVB-S2 is less demanding in terms of power than DVB-S, so we do recommend DVB-S2. Also most OMs will probably use reduced BW DVB-S2, as noted by DG8KD so the best way (IMHO) is to get a Minitioune as it is the most flexible solution on RX. You need to become BATC member to order one, but the fee is small and it's worth it.

    For non-hamradio reception, you are probably out of the main beam of Es'hail-2 so if you want to watch the regular programmes, you can go with a standard satellite receiver but probably need a big dish..


    73s Achim

    I think I have seen aluminum foil covered mesh already. Electrically, this is fine, as long as you keep close to the desired shape. It might be more of a mechanical problem though, especially when wind comes into play (prevent it from tearing apart).

    I would say the mesh size is just at the edge of what is recommended for 10 GHz. One would assume 10% of the wavelength (2.8mm for 10.5 GHz) and you have closer to 4mm if I am not mistaken. It will somehow work but with decreased G/T (leakage from behind). That does not say anything about the parabolic shape or its deviation from the ideal shape. But give it a try :)

    Well, good luck to the authorities trying to prevent people from owning the combination transistor-inductance-coil-battery. Which would be illegal by your explanation. I don't doubt your information but I strongly question the sanity of the lawmakers.. we have been fighting similar stupidities at QRL lately and even those who were enforcing the rules to us in the beginning admitted shortly thereafter that those were not applicable in the real world.

    We as hamradio operators should be grateful for the privilege to build and operate our own designs. Let's make the best use of it!

    Having the privilege to enjoy Qatari hospitality twice already:

    'hail' like in 'mail' or 'snail' . The 'e' in Es'hailSat is almost silent. Es'hail or Suhail is the arabic name for the second brightest star in the night sky, Canopus.

    Well first of all, if I work in an electronics workshop (which I do) why should I be not allowed to purchase RF amplifiers? The module itself is perfectly legal.. I am just not allowed to go on the air with it (hamradio is of course..).

    Then, where do you draw the line between a preamplifier (receive) or driver amplifier? The latter would be TX but some of them can be used for both..

    Just found out: HB9 is great.. we do not care about CE.


    But maybe all the legal regulatory things should go in a dedicated thread to keep this one clean.

    Well, first of all why should I ask for a label saying 'hamradio equipment'? It is a simple RF amplifier and this is not restricted in any way. The question about CE declaration is actually a good one.. I had always the impression that (sub-)modules do not need CE, components likewise. Never can remember any NE555 bearing a CE declaration.. and the amplifier itself cannot be used on its own.