In message <4ef37136.5070...@earthlink.net>, dated Thu, 22 Dec 2011,
Cortland Richmond <k...@earthlink.net> writes:
On 12/22/2011 9:27 AM, John Woodgate wrote:
If the direct and reflected rays are equal amplitude and in phase,
then it's +6 dB; if they are at 180 degrees, it's minus infinity dB.
In between you can get any value, depending on relative phase and
transmission loss.
Equal amplitude only occurs if the direct and reflected paths are the
same distance. A 3 meter OATS can never meet that condition. If the
source and antenna are at 1 meter height, the reflected path is 3.6
meters long
My explanation, including 'If', was in the context of doubt between 3 dB
and 6 dB. Your further information is relevant, but doesn't invalidate
what I wrote.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
Some people who are peeling the finch of the financial crisis are thinking of
biting a rook.
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society emc-pstc discussion
list. To post a message to the list, send your e-mail to <emc-p...@ieee.org>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities site at
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <emcp...@radiusnorth.net>
Mike Cantwell <mcantw...@ieee.org>
For policy questions, send mail to:
Jim Bacher: <j.bac...@ieee.org>
David Heald: <dhe...@gmail.com>
