Can an antenna with a loading coil be modeled electrically?
An antenna with a loading coil cannot be modeled electrically as an element in which the inductor has been replaced by the corresponding length of straight wire. An inductor will behave differently as current at one end of an inductor creates a magnetic field that immediately induces currents at the opposite end.
How do I make my own loading coils for antenna projects?
Make your own loading coils for antenna projects using Caterpillar Grommet strips. Also called flexible grommets, flexible bushings etc. These are used by installers to form protective bushings around the edges of holes cut into sheet metal, and come in strips that are cut to desired length then snapp ed into the hole to cover the raw edge.
Why do mobile antennas need a loading coil?
Mobile antennas are inherently limited by the amount of available space, yet reducing an antenna’s length increases its resonant frequency. A loading coil may be used, on its own or in conjunction with a capacity hat, to tune the antenna to resonance at a lower frequency.
Do multiband HF antennas need a loading coil?
For multiband HF antennas, different loading coils (or adjustable coils) are needed for coverage of each band. An antenna with a loading coil cannot be modeled electrically as an element in which the inductor has been replaced by the corresponding length of straight wire.
How do you make a loading coil?
Here is one method that I have long used to make evenly spaced, nice looking coils of all sizes. Make your own loading coils for antenna projects using Caterpillar Grommet strips. Also called flexible grommets, flexible bushings etc. These are used by installers to form protective bushings around the edges of holes cut into sheet metal,
How many coils do you need for a HF antenna?
One coil placed in the center or at the base of a single-band vertical antenna is sufficient, but a single-band dipole will require two coils – one in each element of the dipole. For multiband HF antennas, different loading coils (or adjustable coils) are needed for coverage of each band.
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In this video I show you how to make a 110µH loading coil to allow 80m operation on a 66ft end fad half wave.
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What is a load coil and how do you measure it?
The loading coil often sits at the base of the antenna, but it is sometimes inserted in the center of the antenna element (center loading) for more efficient radiation. A point to note, though, is that an inductor also adds …
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Make Your Own Loading Coils
make evenly spaced, nice looking coils of all sizes. Make your own loading coils for antenna projects using Caterpillar Grommet. strips. Also called flexible grommets, …
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