The LONGEST DX? Possible Alien Signal from Proxima Centauri

Discussion in 'Amateur Radio News' started by W1YW, Dec 19, 2020.

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  1. W1YW

    W1YW Ham Member QRZ Page

    BLC-1 is the designation for a narrowband emission that --may-- be ET's from Proxima Centauri. However, it has not been received in later observing sessions and is most likely terrestrial interference. The observation was made by the Parkes telescope in Australia and remotely analyzed at Penn State. Here's the info (photo is the Parkes telescope):

    Alien hunters detect mysterious radio signal from nearby star (msn.com)

    [​IMG]
     
    Last edited: Dec 19, 2020
    VK5CM, WB3EBN, N4FZ and 5 others like this.
  2. NN4RH

    NN4RH Premium Subscriber QRZ Page

    I could work this out myself but I am too lazy ..

    What would the ERP have to be for a signal from Proxima Centauri to be heard here?
     
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  3. W1YW

    W1YW Ham Member QRZ Page

    We need the frequency information first.
     
    N4FZ, M1WML and K3FHP like this.
  4. W6RZ

    W6RZ Premium Subscriber QRZ Page

    If you had DSN style 70-meter dishes (7145 MHz) at both ends, you could have a nice CW QSO with only a 100 kW power amplifier (2 trillion watts EIRP).
     
    AB6Z, WQ4G, N4FZ and 9 others like this.
  5. W1YW

    W1YW Ham Member QRZ Page

    We do not know the detection limit of the Parkes system until they publish the info. For example, we do not know the frequency of detection, and it is exceedingly unlikely to be at X band.

    Your point is a good one, which is tens of KW with fair sized dishes could easily be achieved over a parsec or so distance in the microwave window. It is described as a 'beacon', if real, so this is not extraterrestrial leakage from an ET 'cell phone' of low power :->
     
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  6. NN4RH

    NN4RH Premium Subscriber QRZ Page

    980 MHz, according to the article in The Guardian.
     
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  7. W1YW

    W1YW Ham Member QRZ Page

    According to the GUARDIAN?

    My source is the National Geographic piece by Nadia Drake, which was vetted and quotes the actual people involved. No details on frequency, integration time, bandwidth.

    980 MHz is a PIM frequency from the cell bands. This makes the detection exceedingly unlikely to be of extraterrestrial origin.

    If you want to play with the numbers, I will get you the Parkes aperture and the aperture efficiency, but RZ's BOTEC is going to get you a similar answer in the tens of KW's power (not ERP), with assumed 100 sec integrations and 1 Hz bandwidth. The assumption that the TX antenna aperture is similar is commonly made given that unknown.

    Here's some info on Parkes: "The combined system operates best between 0.8 GHz and 1.74 GHz where the beamformed noise temperature is between 45 K and 60 K, the aperture efficiency ranges from 70% to 80%".

    The dish is 64M diameter.
     
    Last edited: Dec 19, 2020
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  8. NN4RH

    NN4RH Premium Subscriber QRZ Page

    And the National Geographic article you linked cites the article in the Guardian, saying "The detection was leaked to The Guardian before the research was ready for publication."
     
    W8NSI, AC0OB, MW1CFN and 2 others like this.
  9. NN4RH

    NN4RH Premium Subscriber QRZ Page

    Maybe the aliens don't know where our cell phone bands are.
     
    YV1FPT, WW0W, N7JVA and 7 others like this.
  10. W1YW

    W1YW Ham Member QRZ Page

    Christmas....that's pathetic. Did it show up in the Daily Mail too?
     
    W8NSI, K8CGS, M1WML and 1 other person like this.

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