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"Cecil Moore" wrote Reg Edwards wrote: A choke balun, a single short length of transmission line wound on a ring or rod, is a different kettle of fish. Its range of impedances is unlimited. The more I think about it, the more it seems likely that a common-mode wave travels down the outside of the braid until it encounters the choke impedance and is reflected, at least partially. That would create common-mode standing waves. When the weather clears up, I think I will see if the common-mode current goes through a maximum and minimum up and down the coax. -- ================================== Cec, its obvious even to a citizens bander that when the common-mode current and volts encounters the choke, or anything else, it is reflected. There's no need to risk your neck to detect it. You won't prove anything anyway. Your particular antenna might not suffer from noticeable common-mode effects. And you can't deliberately inject a test signal at any place because it would upset circuit conditions. Furthermore, the choke does NOT do what the old-wives say it does, ie., stop radiation from the line and prevent noise pick-up. It might even make matters worse. The choke merely shifts the volts and amps standing waves to other places along the line. Have I upset the apple cart again? ---- Reg. |
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