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My radar almost killed a bunch of people

Discussion in 'General Yachting Discussion' started by 993RSR, Aug 17, 2024.

  1. 993RSR

    993RSR Senior Member

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    So, the dock master scolded me for not turning my radar off.

    Question is: Is this 12 year old, 72 mile Furuno non-ionizing? I have always been of the opinion that only large commercial or Military radars are dangerous over many, many exposure incidents. Will the dock boys be able to make babies when the time comes? Only time will tell.
    What do ya think?
  2. Pascal

    Pascal Senior Member

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    Considering the number of euro style pleasure boat with the radar on a low rear arch shooting in the back of the operator head… i wouldn’t worry.

    of wait. Maybe that would explains the number of idiots on the water. And on the roads. And at the polls. Fried brain cells. :)
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  3. Capt Ralph

    Capt Ralph Senior Member

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    It is these ignorant people like this that really ticks me off.
    No, Your not hurting anything or anybody.

    Sadly, if you have to do business with this meat head again, You may just have to appease the Stuff For Brains and set your array to standby..

    I recall some dumb cluck that was yelling at me to turn my radar off, I yelled back to Fly Off and to call somebody that Gave A Darn..
    Last edited: Aug 17, 2024
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  4. captholli

    captholli Senior Member

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    I worked with a couple of electronics engineers in the late 1970's that were part of RCA Marines original technical radar group, and they would love to tell the stories of flash burning hotdogs over a 125 KW transceiver in the lab with an open multi cavity magnetron in place. Mind you they were dangling the franks over an open 125 KW mag.orifice on wooden sticks and while none of them died, the majority of these techs were both bald and colorblind. That being said, Today's modern radar transceivers on yachts max out @ 25KW or so I believe, and the RF is beamed through a slotted array with a wide beam angle so the intensity of the RF is spread and not beam focused. I too had a concerned citizen come running out on a restaurant deck in Connecticut screaming about how our radar was damaging the brain cells of all of the seated youth enjoying lunch. I smiled and replied to his arm flapping screeching diatribe "thank you sir, my radar is in standby mode, and I would never come to the dock transmitting" he just walked away confused but victorious in his mind...
  5. captholli

    captholli Senior Member

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    Just took a look at Furuno Marines latest offerings and they do produce a high power 60 kw "bird or fishing" radar that isn't a solid state or pulse compression unit. (so much for my 25-KW quote). Dunno, 60 KW might be enough to toast some marshmallows at close antenna range and I would have second thoughts of sitting in front of a 65 KW transceiver on the flybridge for extended periods of time
  6. Capt Ralph

    Capt Ralph Senior Member

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    I was pushing 4KW / 4' array when that guy was hollering at me.
    Currently pushing 10KW / 6' array.
    Naw, It's not hurting anybody.

    Now, If I only had my phasor in reach....
    th-1689632548.jpg
  7. SeaEric

    SeaEric YF Historian

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    Many years ago, someone who claimed knowledge suggested that if you stood beyond the "sweep" of the open array, you're safe. YMMV.
  8. MBevins

    MBevins Senior Member

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    I'll put this out there.
    In today's litigious society, do we really think they'd make recreational boating Radar that could even potentially harm it's users ?
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  9. Rodger

    Rodger Senior Member

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    For years I often wondered about ship radar in the Welland Canal when the ship enter the lock up bound the radar is at coping level then it raises 45’ the lines men are walking beside the ship to bring up there lines. The only difference to day is they must keep radar under six miles while transiting canal as it will screw up the lock computers. what does that tell you?
    As of five years ago, they laid of 150 Linesmen as they now have Hands Free Mooring Machines that tie up ships
  10. BRyachts

    BRyachts Member

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    MythBusters did a segment on this years ago.
    Something to the effect of hanging a turkey directly in front of the scanner.
    If I remember the results were completely negative
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  11. Capt Ralph

    Capt Ralph Senior Member

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    Reduce range, reduce transmitted power.
    I don't think the higher power levels hurt anything in computers or data comms, just there is so much stuff in that radar signal and nobody builds stuff in a Faraday Cage anymore, it could enter another machine or data line and corrupt a zero for a one bit.
    Also, they may use micro-wave or satellite comms between stations or a center.
  12. Capt Ralph

    Capt Ralph Senior Member

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    Next, during my exposure to other people's comments on this subject, I have to ad a comment that I have pondered (some).

    A person with a pacemaker. Thoughts?
  13. Norseman

    Norseman Senior Member

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    Maybe not, but it may warm your skin and your eyes:

    Google:

    Marine Radar Radiation
    Marine radar systems operate in the high radio frequency (RF) and microwave range. Unlike X-rays and nuclear radiation the emissions from marine radar are
    non-ionizing
    radiation and do not penetrate the human body but can cause heating of the surface, particularly of the skin and eyes (cornea).
  14. captholli

    captholli Senior Member

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    Phased array radar emissions will cook your innards from the inside out and take your vision and so on. General Electric pioneered a phased array treatment machine in the late 1950's for low beam radiation for cancer treatment by killing the cells in your body. Raytheon Used Phased array in their mobile missile systems in the 70"-80's and yes, Capt. Ralph, the operators of these systems were located in a steel box on the back of a six- by military truck (faraday cage) I don't know of any yachts equipped with phased array systems but plenty of ships and most all military vessels are outfitted in this manner. So at low power you have a great cancer treatment. At high power 550 KW you have a hard-boiled human.
  15. captholli

    captholli Senior Member

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    As in hard boiled egg. Cooked from the inside out . Hard boiled human
  16. Norseman

    Norseman Senior Member

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    Mod Edit: remark removed.
    Sounds like the lady who put her wet cat in the microwave to dry it..:eek:
    Last edited by a moderator: Aug 19, 2024
  17. Seasmaster

    Seasmaster Senior Member

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    From my RADARMAN days in the Navy. Surface ship radar, if it's rotating you can't get close enough - the scanner will knock you over the side. . . Now the air search & height-finder radars, or even the TALOS missile radars-those could be a beast. Especially the TALOS radars. Frisbee a frozen steak up through the beam, and the steak would hit the deck medium-well. Personally saw a demo. Hit the deck sizzling & the Fire Controlmen passed out forks to eat it. . . LOL
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  18. Capt Ralph

    Capt Ralph Senior Member

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    But these are whole different monster radars than what is on our recreational boats.
  19. Capt Ralph

    Capt Ralph Senior Member

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    I was never a fan of low mounted domes or arrays pointing at a person's head or family jewels but after these many years, never heard of a REAL issue.
    I furthered wondered about someone with a pace maker but also, never heard of a REAL issue there also.

    Naw, I'm hardened that there is Not an issue from recreational radar equipment.

    I continue to belive the higher the better, not for saftey but equipment performance.
  20. Cpt Sous-Leau

    Cpt Sous-Leau Member

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    Omni-direction, non-Pulsed, non-phased array eq: Pt/4*Pi*r^2 :: Pt power(cont) transmitted; Pi, 3.14; r distance in meters.

    60Kw at 10M: 60,000/4*3.24*10*10 = 47.8 watts at 33 feet.

    25Kw at 200M: 25,000/4*3.14*40,000 = 0.0497 watts at 660 feet. (edited, to correct, I made a stupid math error)

    If anyone wants the pulsed, an-isotropic, phased array equation done, I charge for that. Just consider, it'll be some small fraction of the above. This is with a generic S/N ratio of about 30:1, which could be common in and around a small marina.

    Long ago, and far away I help install some antenna and radars in southern Africa. The monkeys would often sleep in the antenna array when they were on standby because it was warm. When we turned up the watts, the monkeys would fry, and some jackwad(me) had to go up and rake the dead monkeys from the antenna array. Good times.
    Last edited: Aug 20, 2024
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