In article ,
Wayne.B wrote:

The most
important thing however is to get it above eye level for safety
reasons.

Wayne,

The only reason one would need to worry about Safety, would be
if the consumer or commercial Radar Antenna, had an exposed rotating
antenna, and it could hit someone in the head, while operating.

All the notions about RF Exposure in S and Xband for Marine Radars
is nothing but Oldwives Tales, and outdated equipment, concerns.
The Power Density of 2nd and 3rd Generation Radar Transmitters and
Antenna Systems is not even close to that required for ANY physiological
effects. The Largest of the Commercial Marine Radars today, have a PPP
(Peak Pulse Power) in the 10Kw, and by the time that energy is conducted
thru the rotory Joint and spread out over the 6 Ft, or longer, Slotted
Waveguide Antenna, it is considerable reduced in W/cmSquared. Also
consider that PPP isn't what causes physiological effects, but AvP
(Average Power) and the PL (Pulse Length) and PRR (Pulse Repition Rate)
of the transmitter drop the AvP down to like less than 10 Watts at the
Magnitron output, before it goes to the rotory Joint and Slotted
Waveguide Antenna. This discussion has been covered MANY Times
on various UseNet NewsGroups over the years, and the math hasn't changed
since the last time. Google is your Friend, if you need further
information.
That said, We are talking about CONSUMER, and, or, Commercial Marine
Radars here, and not Military, or First Generation Marine Radars.
Certainly there were a few of the first Generation Decca Radars that
had PPP in the 40Kw and 80Kw ranges that MAYBE could be considered,
possibly, Dangerous, but they have been long gone, for years, in most
cases.


Bruce in alaska
--
add a 2 before @

On Thu, 20 Jan 2005 21:22:22 GMT, Bruce in Alaska
wrote:
The only reason one would need to worry about Safety, would be
if the consumer or commercial Radar Antenna, had an exposed rotating
antenna, and it could hit someone in the head, while operating.

All the notions about RF Exposure in S and Xband for Marine Radars
is nothing but Oldwives Tales, and outdated equipment, concerns.

=========================================

I hope you're right Bruce because my old boat had a 4kw scanner right
in front of the flybridge. Raytheon recommends at least 2 meters
separation and that one was right on the cusp. I never operated it
unless necessary. The jury is still out on the RF exposure medical
studies, and each new one frequently conflicts with the old depending
on who sponsored the research. Meanwhile I'll still try to stay out
of the beam of anything as much as possible.