STEREO-A (Heliocentric)

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    https://stereo-ssc.nascom.nasa.gov/where.shtml
    https://stereo.gsfc.nasa.gov/


    1st deep space capture on X band, 8443.555MHz (approximately). Using a plumbing component feed with the 7.5GHz LNA on a 1.2m dish. It's not a great system with a sky/ground noise figure of ~3dB. About 10dB S/N in 0.5Hz. 9125MHz LO inverts the spectrum so the doppler change is downwards.
    2.5Ms/s, decimated by 64, 131k FFT

    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

    • Offizieller Beitrag

    This evening's signal. The feed was improved slightly (2.2dB sky/ground NF now) but the changed vertical scale makes it look better. 100Hz/div horizontal scale.

    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 ()

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    Tonight's plot. I need to fix the LO drift, it is greater than the doppler change. The frequency is reducing which would be seen as increasing frequency on my plot as the LO is on the high side.

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    Not such a good signal but frequency is locked now.

    • Offizieller Beitrag

    9450MHz LO
    8443.5607MHz

    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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    Today's signals, he first whilst data was enabled and the second with data off just after the end of transmission to Madrid.


    RX frequency in file name. That is down-converted to 421.4MHz with spectral inversion.

    • Offizieller Beitrag

    Plot of STA whilst talking to Madrid today. 1.2m dish, ~1dB NF, modified Prodelin feed.


    The signal level on Madrid's 70m dish (DSS63) at the same time was -118dBm. The distance today is about 194 million km vs. 246 for the earlier plots.

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    Probably not transferring data so a stronger carrier today.

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    Probably not transferring data, 205.7 million km, 9GHz LO, 1.2m dish.

    • Offizieller Beitrag

    Not transferring data, 184 million km, 1.2m dish.
    Probably the most reliable craft to use as a beacon.

    • Offizieller Beitrag

    In communication with Madrid DSS63 at -118.5dBm, 182.5 million km,
    9GHz LO, 1.2m dish

    • Offizieller Beitrag

    In communication with Madrid DSS63 at -117dBm, 176..7 million km,
    1.2m dish


    RX Tuned to 8443.551MHz, IF frequency 21.4MHz with frequency inversion. Upper plot not inverted.

    • Offizieller Beitrag

    In communication with Madrid DSS65 at -122dBm, 149.8 million km


    RX Tuned to 8443.570MHz, IF frequency 21.4MHz with frequency inversion. Upper plot not inverted.

    • Offizieller Beitrag

    A bit closer today at 63.3MkM, probably not in 2 way contact with a ground station. 8443.606 = 21.4MHz, signal inverted.


    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

  • Re-commissioning the system, I used this to check things out. It's the first time I've seen much of the modulation sidebands. To be expected as it was quite close to Earth at 27.7Mkm.

    21.4MHz = 8443.569MHz


    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

  • Bit closer at 25.5Mkm

    21.4MHz = 8443.569MHz


    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

  • At about 13.7Mkm and 5dB stronger than the previous plot. The actual level at the feed point was -130dBm +/-2


    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

  • 11.7Mkm -100dBm on DSS56, Madrid, 720kb/s


    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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