RADAR Questions

["Denny, Thomas" <thomas.denny@rfets.gov>]

---------------------------- Forwarded with Changes ---------------------------
From: Thomas Denny at CC_TEN
Date: 5/10/96 6:59AM
To: ONEOFF_ADDR=BColenso@aol.com::route=EXTRN at ALISAMAIL
To: ONEOFF_ADDR=BColenso@aol.com::route=EXTRN at ALISAMAIL
Receipt Requested
Subject: RADAR
---------------------------- Forwarded with Changes ---------------------------
From: <nobody@iron.nttc.edu>, Thomas M::(NBDYTM)  at alisamail
Date: 5/9/96 4:22PM
To: Thomas Denny at CC_TEN
Subject: RADAR
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The below message was posted to another reflector I am subscribed to. I
reposting it (with the author's permission) in the hope that someone out in
Radsafe-land may be able to help. As noted below, please respond directly since

he is not subscribed here.
Thanks.

    ^   ^
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Thomas P. Denny III                    thomas.denny@rfets.gov
USDOE Rocky Flats (this message does not reflect any of their
policies, etc. etc. etc.)
N0WVU        DM79hv        SMIRK #5763        50MHz VUCC #749
Guantanamo Bay, Cape Hatteras, Flagstaff, Phoenix, Corvallis,
Tucson, Vallejo, Bremerton, Golden, Etc.


Subject: RADAR
Date: Thu, 09 May 1996 20:22:48 -0400
--------
    I have another safety related question, and would appreciate as much input
as possible.
    I'm the electronics person on the test team that crash tests vehicles for a
major car manufacturer.  The test vehicle is towed by a cable (the tow motors
can deliver 1200 hp), with the speed controlled by radar.
    I just learned today in a meeting that the radar is on continuously. (In the
past, I thought it was turned off, and turned on as we were doing our pretest
countdown).
    The radar is K band (24 GHz) and has an output of 64 mW.
    In the coarse of setting up a test, I am regularly straight in front of the
radar gun, only 10-12 feet away, for 15 minutes at a time, 2 or 3 times a
day, and am often positioned with it going straight into my head 6 inches
away.  This happens 5-6 days a week, month after month, year after year.
    Comments???  Concerns???
    The opening of the radar gun is about 2 1/2 inches.  Is there a way to
calculate the beamwidth (3 Db points)?
    Also, assuming that the intensity is inversely proportional to the square of
the distance, is there a way to determining the safe distance for constant
(2080+ hours per year)  exposure.
    Thanks in advance.

Bob
KD8WU
======================================================
Would persons in these lists please mail me directly, as I am not a member of
these lists, but sounded like a great place for this kind of a post.
Thanks again,
Bob

BColenso@aol.com
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