24.9°E Alphasat (incl.)

  • This is the carrier from the propagation experiment on a nominal frequency of 39.402GHz, actually about 23kHz high.


    Received using an old experimental link RX head end, thanks uhf-satcom. An external, 9.5GHz, GPSDO locked source is multiplied to give a 38GHz LO. The noise figure is in the region of 8-10dB with a linear polarised feed on a 220mm Cassegrain dish. Bits fell off the ageing down-converter before I had time to look for the beacon on 38.4027GHz.

    Images

    1.2m Prodelin 1224 az-el with one of:
    S: Helical feed, 0.8dB NF LNA, X: 1.2dB NF LNA, conical feed,
    Ku wide band: corrugated conical feed, 1.5dB NF LNA, Ku (Standard): Octagon OSLO mod for C120 & ext ref 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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