Moonbounce DL0SHF

    • Offizieller Beitrag

    I fitted an Octagon PLL LNB to the Prodelin 1.2m. The az-el is quite well calibrated on an RC2000 to within a degree.


    <Edit 18-6-18> the beacon is back on but not always at full power. There is a status page here: http://moonbeacon.dl0shf.de/


    The Octagon works OK down to 10368MHz. However, the total system noise temperature is around 260 deg. K which is quite poor. This compares to 180K at 10.7G and 150k at 12G, still not very good. The noise temperature was measured using the sky/ground method.


    I found the moon by monitoring the noise level and looking for a peak. It is only about 0.25dB so not very obvious. Once I had that and calibrated the frequency I found the beacon on the spectrum display of SDR# using an Airspy SDR. The attached plot is of DL0SHF transmitting in QRA64 mode. The multi-tone modulation can be seen on the waterfall. I haven't got the decoder together yet.

    Bilder

    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

    2 Mal editiert, zuletzt von s-band ()

    • Offizieller Beitrag

    I finally managed to decode it using WSJT-X https://physics.princeton.edu/pulsar/k1jt/
    It transmits QRA64D on even minutes and FSK CW on odd minutes. The PC time must be set to within a second or so.
    The attached output was from a time when the PA must have been off hence the low signal.

    Bilder

    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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