Ham Radio Antenna Design Notes

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Considerations in Design

resonance / swr

Q

Impedance

Common Mode Current

Velocity Factor

Math

492 / Freq in MHz

1005 / MHz

Talking Points of Experience

Loading coil to simulate length, but inefficient and generates heat, doesn't handle high power well.

DC grounded antennas are ideal: prevents static build up on antenna

Precision in element length becomes more significant at higher frequency

Understand how capacity hats impact resonance

Impedance Dipole vs Inverted V

A dipole in free space should have about 72 ohms of input impedance. As you move the poles down to form and inverted V the impedance lowers.