On this date in history

Discussion in 'Amateur Radio News' started by WJ4U, Aug 17, 2020.

ad: L-HROutlet
ad: l-rl
ad: Subscribe
ad: abrind-2
ad: Left-3
ad: Left-2
ad: L-MFJ
  1. WJ4U

    WJ4U Ham Member QRZ Page

    Between 1956 and 1961, The Ohio State University built a large radio observatory at nearby Delaware OH. Known as Big Ear, it had a reflecting surface roughly the size of a football field, with antennae at the end zones.

    Big Ear.jpg

    Big Ear was used in the Search for Extraterrestrial Intelligence (SETI) from 1973-1995, longer than any other facility in the world. It was “tuned” to 1420 megahertz, because hydrogen (the most abundant element in the universe) emits that frequency; thus an advanced civilization would likely be aware of it. Signals at 1420 MHz would presumably have an extraterrestrial origin, since that frequency was reserved for SETI, and earth-based facilities were prohibited from transmitting it.

    Big Ear historical marker.jpg

    On this date in 1977, Big Ear detected a strong signal that appeared to come from the direction of Sagittarius. Astronomer Jerry Ehman circled the data on his computer printout and wrote Wow! in red ink. This observation has been known as the Wow! signal ever since.

    A plot of signal intensity (averaged over ten-second intervals) vs. time shows it rising and falling smoothly over a 72-second window. The alphanumeric sequence 6EQUJ5 is simply its signal-to-noise ratio with E=15; Q=26; etc.

    Ehman never observed a comparable signal again, despite more than fifty attempts. Nothing remotely like the Wow! signal was detected during two decades of searching at several facilities, including the Very Large Array in New Mexico, which is much more sensitive than Big Ear. 6EQUJ5 remains, to this day, our strongest physical evidence for a possible extraterrestrial civilization.
    W4MAJ, WW2PT, KF4ZKU and 12 others like this.
  2. KC8YG

    KC8YG Ham Member QRZ Page

    And they sold the property some number of years ago and now it's a golf course ...
  3. WJ4U

    WJ4U Ham Member QRZ Page

    Indeed! BigEar Destroyed

    In late 1997, after almost 40 years of operation, the Ohio State University Radio Observatory, with its "Big Ear" radio telescope, ceased operation. The land on which the observatory was sitting (owned by the Ohio Wesleyan University, Delaware, Ohio) was sold by them in 1983 to land developers who later claimed their rights to develop the land. The telescope was destroyed in early 1998. An adjacent 9-hole golf course was expanded into 18 holes and about 400 homes were planned for construction on the nearby land owned by those developers.

    This website is meant to serve as a memorial to that unique radio telescope, to its designer and builder (the late Dr. John D. Kraus) and the many persons involved with the telescope, and to the discoveries made with that instrument.

    N2ZDH, KF4ZKU, F8WBD and 1 other person like this.
  4. N1IPU

    N1IPU Premium Subscriber QRZ Page

    Just sad. Though I was never to sure about SETI.
    KF4ZKU likes this.
  5. W1YW

    W1YW Ham Member QRZ Page

    The Ohio State Radio Observatory was a survey instrument which lacked both sensitivity, selectivity, and a symmetrical beam, compared to other facilities. This meant that its primary purpose was ended at the completion of the survey.

    For a while the reflector was used as part of a near-field range.

    The demise of the facility was two-fold: a delay was allowed to give astronomers time to find resources to keep it open. The community was not behind that and it indeed was dismantled for a golf course.

    The absence of redundacy --repetition or independent measurement --means that the 'wow' signal must be discounted as a noise phenomenon.

    "Noise is unique, signals are redundant".

    Then, and now.

    BTW, 1420 MHZ is not, and was not 'reserved for SETI'. It is a protected band because the 21cm hydrogen spectral line falls there, and much NON-SETI research is undertaken.

    It is odd that we 'celebrate' an anecdotal noise feature.

    Chip W1YW
    Last edited: Aug 17, 2020
    AC0OB, WQ4G, KA5RIO and 2 others like this.
  6. G0WXU

    G0WXU Ham Member QRZ Page

    A sad day when the land was sold off and the whole establishment was got rid of to build a golf couce and housing. History down the drain. I no doupt wonder if any of the golfers today even ever think about the history of the site. ?.
    73 de John - G0WXU.
    KF4ZKU likes this.
  7. W1YW

    W1YW Ham Member QRZ Page

    The system used was a 50 channel correlator with 10 KHz resolution. The sky basically 'transited' through the beam, which gave the profile made from the letters and numbers. It's a Gaussian, which is what you would expect with that beam for a 'point' source that is celestial in nature, that transits through.

    A few channels away you see a weaker signal transiting with the same timing.

    The second 'noise or signal' is suspicious because it could just as easily indicate an intermod from overload, for example. Which makes you wonder if the 'wow' itself is overload from some other source, such as a satellite, transmitting at some other frequency outside the correlator passband. To wit: 'circumterrestrial'.

    Today we see similar types of issues with PIM at cell frequencies.

    There is no evidence supporting the unique explanation that the WOW was an intelligent transmission of extraterrestrial origin.

    Chip W1YW
    NL7W, KA5RIO, KA0HCP and 1 other person like this.
  8. PU2OZT

    PU2OZT Ham Member QRZ Page

    Realocating, time ago, all the $ETI financement towards Fusion Power would have been wise.
    KC1DR and KW4UP like this.
  9. KW4BY

    KW4BY Ham Member QRZ Page

    and the amateur pioneer in weak signal callsign behind this project to complete the story pse, 73
  10. WB8BCU

    WB8BCU Ham Member QRZ Page

    I grew up in the shadow of Big Ear. First licensed as a teenager at 15 (WN8BCU/WB8BCU) I was a member of the Columbus Amateur Radio Association. Though a bit young to appreciate it at the time, I was blessed by the regular participation of Dr. John Kraus (W8JK) and Dr. Robert Dixon (W8ERD). One of my most memorable moments was a private tour of Big Ear they gave. I still have the photos I took that day with my Instamatic camera.

    Fast forward...the Big Ear is demolished to make room for housing and a golf course. Why? Because money talks. Adjacent to the Big Ear site is Perkins Observatory. Built in 1923 it was at one time the home of the largest telescope in the world (69" aperture mirror). Now its existence is being threatened because once again money talks. It is disappointing and sad.

    Mark WB8BCU
    N2ZDH, 2E0CIT, KF4ZKU and 6 others like this.

Share This Page