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Transmitter Output Impedance
This group has presented members with valuable lessons in antennas and
transmission lines, like how to measure, how to match, etc. Something I haven't seen is a discussion of the source impedance of the transmitter. My curiosity was piqued today as I took some baby steps into EZNEC. A particular antenna had such-and-such VSWR if fed with a 50-ohm cable and a different value if fed with a 75-ohm cable. While this is hardly news, it got me wondering whether a 75-ohm cable will load the transmitter the same. Doesn't seem like it. My point: Using 75-ohm cable to improve the match at the antenna won't help me ... IF ... I suffer a corresponding loss due to mismatch at the back of the radio. My HF radios, all solid state, specify a 50 ohm load. As necessary, I routinely use an internal autotuner and either of two external manual tuners. (I'm aware of the published 1/12 wavelength matching method.) Wisdom in any form would be appreciated. Thanks. "Sal" (KD6VKW) |
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