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Dr. Slick wrote:
Would these be the termination resistors to ground, one for each directional coupler? Yes I would think that you would have to adjust the width of the traces as well, or the thickness of the dielectric material, or the space between the couplers and the thru-line to use it for an impedance other than 50 Ohms (talking about commercial equipment, that is). I use a toroid to sense the RF current and an R=Z0 resistor to turn it into a voltage. I have a capacitive voltage divider on the RF voltage which is adjustable for calibration purposes. The only real difference between it and a 50 ohm SWR meter is the internal load resistor. It's actually a bridge circuit with a Z0 reference resistor. Unfortunately, it is not very accurate for the relatively high SWRs that I run on my ladder-line, e.g. 4:1 to 16:1 -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 80,000 Newsgroups - 16 Different Servers! =----- |
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