10.0°W Quasar 20 [USA-269] (incl.)

    • Offizieller Beitrag

    Received using a 3dB NF LNA and linear, vertical, feed on 1.2m dish.


    3 different spectra seen over a period of 12 hours. The beacon is in band E on 17.810MHz and is LHCP.

    • Offizieller Beitrag

    Using a band B LNB with circular polariser it can be seen that there are 2 polarisations. The original plots, in the post above, with be showing both at the same time hence one plot is a combination of 2 modes (green trace). There appears to be a 3rd mode which is very wide band and may be similar to other Orion/Mentor satellites.


    These plots have not been normalised to remove the LNB passband shape but show: the narrow band mode alone, narrow on RHCP & medium on LHCP and 3 different, very wide band, modes on RHCP. It seems that both polarisations can be switched to any mode. Note that the sensitivity of the LNB drops significantly towards the edges of the scans.

    • Offizieller Beitrag

    The beacon seems to have 3 different modes shown here: RE: Ka-band E/A beacons


    Here's todays wide capture using RHCP


    1.2m Prodelin 3122 az-el with one of:
    S: Helical feed, 0.8dB NF LNA, X: 1.2dB NF LNA, conical feed,
    Ku 12-18GHz: corrugated conical feed, 1.5dB NF LNA, Ku (Standard): SMW Q-PLL type C, Prodelin feed. Ku (Extended): 11.3GHz LO SMW & Prodelin Feed Ka: Gilat ex-ODU PLLs Gilat feeds, Ka 18-26.5GHz: Patriot feed, home made 4dB NF LNA, Ka DSN: Corrugated conical feed, home made 3dB NF Down-Converter

    1.5m IRTE, Polar mount with Octagon OSLO mod. C120, IRTE feed
    40km East of London, UK

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