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"Reg Edwards" wrote in message Zo of ALL real, ordinary, transmission lines changes versus frequency over a very wide frequency range. Zo ranges over lots of thousands of ohms at a few cyles of seconds, thousands of ohms at power frequencies, hundreds of ohms at audio frequencies, and from tens to a few hundred ohms from 100KHz up to as many GHz as you like. --- Reg. Are we talking the same thing for Zo ? That a piece of say rg-8 ( whatever they want to call it now) that is 50 ohm coax is not 50 ohms over its normal operating frequency range ? ============================= What is your normal operating frequency range? Here is Zo typical of cable similar to RG-58 versus frequency. Nominal Zo = 50 ohms. Degrees = Angle of Zo. Freq Zo Degrees ------ ------- ------- 10 Hz 3000 -45.0 100 Hz 950 -44.9 1000 Hz 301 -44.1 10 KHz 97 -36.4 100 KHz 54.2 -10.1 1 MHz 50.0 -2.6 10 MHz 48.4 -0.84 100 MHz 48.0 -0.26 1 GHz 47.8 -0.08 Superimposed on the above Zo vs F characteristics are manufacturing reel-to-reel variations of 2 or 3 percent. ---- Reg, G4FGQ |
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