us in the choir know that. I'm curious about Gerts response since he brought it up twice. I've heard there is more but didn't follow the math for the proof, but the word description made sense. It is interesting in theoretical sense, and in a specific practical experiment to demonstrate it, but not in the practical application with random orientations of various radiators of a EUT.
________________________________ From: Ken Javor <[email protected]> To: "[email protected]" <[email protected]> Sent: Friday, December 23, 2011 10:28 PM Subject: Re: Semi-Anechoic Chamber Question - Correction Factor Re: Semi-Anechoic Chamber Question - Correction Factor Constructive vs. destructive interference. Ken Javor Phone: (256) 650-5261 ________________________________ From: Bill Owsley <[email protected]> Reply-To: Bill Owsley <[email protected]> Date: Fri, 23 Dec 2011 19:25:13 -0800 (PST) To: "ce-test, qualified testing bv - Gert Gremmen" <[email protected]>, John Woodgate <[email protected]>, "[email protected]" <[email protected]> Subject: Re: Semi-Anechoic Chamber Question - Correction Factor And the effect of this phase shift, or no phase shift, would be...??? ________________________________ From: "ce-test, qualified testing bv - Gert Gremmen" <[email protected]> To: John Woodgate <[email protected]>; [email protected] Sent: Friday, December 23, 2011 4:58 AM Subject: RE: Semi-Anechoic Chamber Question - Correction Factor It's relevant to understand between vertically polarized waves that have a 180 degree phase shift on reflection, and horizontally polarized waves that do not. Regards, Ing. Gert Gremmen, BSc [email protected] www.cetest.nl <http://www.cetest.nl> Kiotoweg 363 3047 BG Rotterdam T 31(0)104152426 F 31(0)104154953 Before printing, think about the environment. -----Oorspronkelijk bericht----- Van: [email protected] [mailto:[email protected]] Namens John Woodgate Verzonden: Thursday, December 22, 2011 7:30 PM Aan: [email protected] Onderwerp: Re: Semi-Anechoic Chamber Question - Correction Factor In message <[email protected]>, dated Thu, 22 Dec 2011, Cortland Richmond <[email protected]> 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 <http://www.jmwa.demon.co.uk> and www.isce.org.uk <http://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. 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