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And something to keep in mind with loading coils, as opposed to impedance matching coils, is that a loading coil only affects resonance. It has very little, or nothing to do with impedance matching. The only purpose of a loading coil is to shorten a 'too long' antenna, that's it. In almost every case, a loading coil reduces the efficiency of an antenna. May not be much, but it's less efficient.
An impedance matching coil only does one thing, it changes some impedance to one closer to 50 ohms. A resonant antenna doesn't have to have an input impedance close to 50 ohms, they almost never do. SWR and resonance are NOT the same things at all.
- 'Doc

[QUOTE="W5LZ, post: 450161, member: 129"] And something to keep in mind with loading coils, as opposed to impedance matching coils, is that a loading coil only affects resonance. It has very little, or nothing to do with impedance matching. The only purpose of a loading coil is to shorten a 'too long' antenna, that's it. In almost every case, a loading coil reduces the efficiency of an antenna. May not be much, but it's less efficient. An impedance matching coil only does one thing, it changes some impedance to one closer to 50 ohms. A resonant antenna doesn't have to have an input impedance close to 50 ohms, they almost never do. SWR and resonance are NOT the same things at all. - 'Doc [/QUOTE]

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