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Hi Richard,
En Richard Clark va escriure en Wed, 12 May 2004 00:32:35 GMT: These designs also have the benefit of low pass filters aiding a smooth transition of Z from the device Z on the order of 0.5 to 1 Ohm to the System Z of 50 Ohms. This is something I have always thought: When driving loops, very short monopoles (VLF) or other low-impedance antennas, why raise transmitter Z to 50 ohms, send it through the line and lower it again to whatever required? Couldn't the amplifier be built directly at the antenna base so _no_ transmission line is required and couple directly the low Z at the final transistor(s) to the low Z at the antenna? Aside, for VLF, audio is usually transferred at 8, 4 or even 2 ohms. VLF is not that far apart from audio, only 1 decade higher. 73s Toni - EA3FYA |
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