Beiträge von dl4eax

    Because 'horizontal' is referenced to the local system. Linear H in Europe and linear V in Brasil generate the same signal at the satellite. RHCP will always be RHCP when it reaches orbit, no matter where it originates.

    For uplink we chose this as this is kind of S-Band standard and space rated antennas are easily available. The same is true when using linear on X-Band downlink (as you might see when checking your TV satellite programme settings). We need both polarisations to decouple the WB and the NB transponder and as the local definition of horizontal/vertical is depending on your location, you need to apply LNB skew, which can be calculated here:

    Satlex Az/El/Skew Calculator

    Thanks a lot for this excellent explanation.

    Hello,


    I stumbled across a reasonably priced WLAN directional antenna.


    https://www.tp-link.com/de/pro...cat-5691_TL-ANT2424B.html


    According to the manufacturer, it has 24 dBi gain and is vertically polarized.


    What would happen (except 3 dB loss due to RHCP) if this antenna would be used for the uplink?


    73 Michael - DL4EAX



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    Hallo,


    ich bin über eine preisgünstige WLAN Richtantenne gestolpert.


    https://www.tp-link.com/de/pro…cat-5691_TL-ANT2424B.html


    Laut Hersteller hat sie 24 dBi Gewinn und ist vertikal polarisiert.


    Was würde (außer 3 dB Verlust gegenüber RHCP) passieren, wenn man diese Antenne für den Uplink nutzen würde?


    73,


    Michael - DL4EAX