On Wed, 2008-05-21 at 09:00 -0700, Ron Castro wrote:
> Indeed, those are higher frequencies, although the absorption rate at those
> wavelengths is lower than some commonly used amateur frequencies, at least
> according to OET-65. At radar frequencies, dish antennas can develop a lot
> of gain and ERP's get enormous, giving rise to the "microwave oven effect".
> Why did the Navy check those guys in 1958? Who knows? They didn't know
> much about RF back then. When I was in the Navy in 1969, the rumor was that
> radar operators got cataracts as a result of working around the equipment,
> but we know now that that's not true.
Its been reported for nigh on 60 years that looking into a X band
waveguide excited by a 20 or 50 milliwatt local oscillator klystron WILL
make near instant cataracts in men or rabbits. That's not a great power
density, less than 100 milliwatts per square inch. The power density in
front of a 50 x 50' dew line dish would take 72 KW at the feed to get to
100 milliwatts per square inch.
> As for the guy who was on the nuclear
> powered carrier, again, *ionizing* radiation from nuclear sources and
> *non-ionizing* radiation from RF have nothing in common except that they
> "radiate" out from a central point. So does a light bulb.
>
> Ron N6IE
> www.N6IE.com
>
73, Jerry, K0CQ
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