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Now THAT would be a huge antenna

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by N7WR, Jan 2, 2019.

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  1. N7WR

    N7WR Subscriber QRZ Page

  2. NH7RO

    NH7RO Ham Member QRZ Page

  3. W9KEY

    W9KEY XML Subscriber QRZ Page

    In 1989, the US completed an Extremely Low Frequency (ELF) antenna in northern Wisconsin called Project ELF, also for the purpose of submarine communication. It was 84 miles long (135 km). According to below article, at its operational frequency (76 Hz), it took 15 minutes to transmit a 3 letter code using a pair of linked transmitters consuming 2.6 megawatts. Certainly not "real-time" communication! It was shut down in 2004.

    It operated 24 hours per day so subs could determine if they were within receiving distance (about 1/2 of the earth). I recall my brother-in-law (a civil engineer) worked on the construction site while it was being built. Actually, I didn't realize it was shut down until searching for background details to write this post.

    Interestingly, there was an attempt to put the antenna in the Texas Llano Uplift, but Texans didn't want it. Too small, I suppose!

    https://en.wikipedia.org/wiki/Project_Sanguine
     
  4. K1SZO

    K1SZO XML Subscriber QRZ Page

    Nice, I love QRP operating!
     
  5. WB5YUZ

    WB5YUZ Ham Member QRZ Page

    Ah, yes, the good ol' 4,000,000m band...
     
    AD5HR likes this.
  6. K8ERV

    K8ERV Ham Member QRZ Page

    I thot subs were sandwiches---

    TOM K8ERV Montrose Colo
     

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