Re: Need help with field uniformity @ 10V/m

2007-03-14 Thread emc-p...@ieee.org
Ken, It would be helpful to look at the power required at all the probe positions. Sometimes you can deduce where reflections are occuring from the probe values, ie: are the nodes/nulls row or column dependent. FWIW, I never use the constant field method, instead I use the constant power

Re: Need help with field uniformity @ 10V/m

2007-03-14 Thread emc-p...@ieee.org
Ever play pool/billards ?? Missed a corner shot and watched the ball come back close to you?? The most overlooked reflection in a chamber is the corner one, probably because it makes your head hurt trying to visualize it. ps. the three sided corner is called a retro-reflector and there are 8 in

Need help with field uniformity @ 10V/m

2007-03-14 Thread emc-p...@ieee.org
Hello, I'm trying to qualify my 3 meter chamber for field uniformity at 10 V/m and could use some help. I was able to get 18V/m at all 16 points of the grid (only need 12) with the antenna in the vertical position, but couldn't do it when the antenna was switched to the horizontal position. I