Hi,

I received this message from a colleague but I cannot answer him. I d
not know these systems.
Could you help me ?

My company has installed a Radar Tower for Port survaillence. The tower
is about 50 meter height on top of the of a 3 stories building roof and
my office building just below the tower on the same level, 20 meter away
from the tower. At the same time, the surrounding is my working area (
Jetty Terminal for ships loading and unloading activities ). I can say
that I'll be around that area 12 hours a day for another 20 years.

My question:

Is it safe to work in that area????

Thanks in advance
Thierry
http://www.astrosurf.org/lombry


--
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG

On Sat, 7 Jan 2006 15:47:01 +0000 (UTC), "Thierry"
wrote:
My company has installed a Radar Tower for Port survaillence. The tower
is about 50 meter height on top of the of a 3 stories building roof and
my office building just below the tower on the same level, 20 meter away
from the tower.

When I was a lad in Electronics School
They tied my ass to a students stool.
A radar was operating just 20 feet away;
And with each turn it pointed our way.

We thought it was just to test the running gear.
Certainly we never considered it with fear;
But when the TV in the corner sizzled with each pass,
We counted revolutions to the end of class.

At the same time, the surrounding is my working area (
Jetty Terminal for ships loading and unloading activities ).

In light of the fear, here's a piece of impudence:

I can say that I'll be around that area 12 hours a day for another 20 years.

My question:

Is it safe to work in that area????

No, the industrial sound level will undoubtedly lead to hearing issues
later in life (if you survive the radiation).

73's
Richard Clark, KB7QHC

Apologies to Gilbert and Sullivan and "The Monarch of the Sea"

Hi Thierry

I dont have the answers on hand. There are however exposure limits set
by legislation in various countries. You will often find websites that
help you determining what the conditions are at your location. Amateur
radio stations for example meed to be concerned about EMR levels when
the radiated power gets high.

If you cant find anything on your countries radiocomm authorities site
have a look at the US's FCC or Australia's ACMA sites. The exposure
limits tend to be a fairly universal thing. I would suggest too that to
license such a radar structure a EMR study would have to be done as a
matter of course. This is a important part of spectrum and safety
planning that is certainly the norm in Australia.

I would suspect too that being used for ships at short range the output
power would not be nowhere near what is used at longer distances. If
perchance it is used for longer range as well, then the antenna system
would be designed in such a way that most of the radiated power is
horizontal and as such only a small component would be aimed down at
your office/work location. This is the same logic as placing a cellphone
antenna up very high so that nearby EMR is not an issue.

My gut feel is that it is safe. You havent of course provided power and
antenna pattern figures for the installation.

Cheers Bob W5/VK2YQA

Thierry wrote:


My question:

Is it safe to work in that area????

Thierry wrote:

Hi,

I received this message from a colleague but I cannot answer him. I d
not know these systems.
Could you help me ?

My company has installed a Radar Tower for Port survaillence. The tower
is about 50 meter height on top of the of a 3 stories building roof and
my office building just below the tower on the same level, 20 meter away
from the tower. At the same time, the surrounding is my working area (
Jetty Terminal for ships loading and unloading activities ). I can say
that I'll be around that area 12 hours a day for another 20 years.

My question:

Is it safe to work in that area????

Thanks in advance
Thierry
http://www.astrosurf.org/lombry

--
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG

I have spent most of my working life around various RADARs starting in my
late teens at the Royal Radar Research Establishment; which was flooded with
RF from numerous operating systems on a large variety of frequencies -
throughout much of the establishment a neon bulb would often light just from
the RF environment.

The last 25years or so before retirement were in a building with numerous
installations, including a long range L band ATC primary and secondary
installation which provided some entertainment in idle hours as I computed
the radiation pattern - with a surprising degree of accuracy - from the
noise emanating from my office radio as the beam swept by.

Across the hall was a lunchroom with a large health and safety warning sign
on the door that a microwave oven was in the room. Looking out the window
one was staring down the throat of an operating marine RADAR less than 30
feet away!!

To the best of my knowledge no one who worked there has developed any
strange illness that even rumour has related to the RADARs. I retired 10
years ago and have no significant illness.

Oh yes, and my kids seem to be relatively normal. (Maybe because I wore
aluminum underwear?)

Dave

In article
lgate.org,
"Thierry" wrote:

Hi,

I received this message from a colleague but I cannot answer him. I d
not know these systems.
Could you help me ?

My company has installed a Radar Tower for Port survaillence. The tower
is about 50 meter height on top of the of a 3 stories building roof and
my office building just below the tower on the same level, 20 meter away
from the tower. At the same time, the surrounding is my working area (
Jetty Terminal for ships loading and unloading activities ). I can say
that I'll be around that area 12 hours a day for another 20 years.

My question:

Is it safe to work in that area????

Thanks in advance
Thierry
http://www.astrosurf.org/lombry

Oh yea, you gonnies are going to shrink up, and you winkie is going to
fall off......for sure.....

you

On Sat, 07 Jan 2006 11:16:13 -0600, Bob Bob wrote:

I would suspect too that being used for ships at short range the output
power would not be nowhere near what is used at longer distances.

Hi Bob,

Probably only about 100KW peak, perhaps half a million.

73's
Richard Clark, KB7QHC

If the radar antenna is 50m above your friend's level he'll be well
below the main beam.

While radars do typically have very high peak power outputs they only
transmit for a very brief fraction of time then shut off while they
listen for the echoes coming back from the
ships/planes/trains/automobiles/some clod walking his dog/what have
you. This drops the effective power output to a low level. As the
only demonstrated effect of radio waves is thermal (that is to say
they'll heat you up). the end effect isn't much diferent than what
you'd get from somebody shining a flash light at you from some
distance away. If your friend is worried about cancer lots of people
have tried to prove radio waves can do this but it hasn't been
reproducibly shown yet. If there is a link I'd think the research
would have conclusivly proven it by now. Have a look here-

http://www.mcw.edu/gcrc/cop/cell-pho...Q/toc.html#23B

This is really aimed at cellphone installations but the same general
ideas apply.

H.




On Sat, 7 Jan 2006 15:47:01 +0000 (UTC), "Thierry"
wrote:

Hi,

I received this message from a colleague but I cannot answer him. I d
not know these systems.
Could you help me ?

My company has installed a Radar Tower for Port survaillence. The tower
is about 50 meter height on top of the of a 3 stories building roof and
my office building just below the tower on the same level, 20 meter away
from the tower. At the same time, the surrounding is my working area (
Jetty Terminal for ships loading and unloading activities ). I can say
that I'll be around that area 12 hours a day for another 20 years.

My question:

Is it safe to work in that area????

Thanks in advance
Thierry
http://www.astrosurf.org/lombry

OK Thanks Howard and the others.
I have well an article on my website about EMR and health but I hadn't
data about radar.

Still thanks
Thierry

I don't understand being "on the same level" AND being "20 feet below".

73, Steve, K,9.D;C'I

I've been working in RF and transmitters for many years and I can say that
there are absolutely no side eff eff eff effects.
*(:-)


"Thierry" wrote in message
oups.com...
OK Thanks Howard and the others.
I have well an article on my website about EMR and health but I hadn't
data about radar.

Still thanks
Thierry

In article ,
"Steve Nosko" wrote:

I don't understand being "on the same level" AND being "20 feet below".

73, Steve, K,9.D;C'I

Seems that you don't understand the Antenna Beamwidths in the Horozontal
and Vertical Planes, on Modern Marine Radar Systems.

Me