What is harmonic antenna?

What is harmonic antenna?

[här′män·ik an′ten·ə] (electromagnetism) An antenna whose electrical length is an integral multiple of a half-wavelength at the operating frequency of the transmitter or receiver.

What is a compromise antenna?

Compromise antenna” usually means things like a dipole hung too low for optimal DX propagation or loading coils that make a too-short antenna appear resonate to the transmitter, incurring loss.

How long does an end fed antenna last?

It is important to use a counterpoise. A standard recommendation (see QST, March 1936, p. 32, “An Unorthodox Antenna”) is an 84′ long end fed and a 17′ long counterpoise (6.5′ for 20m)….Wire Lengths for Various Band Combinations.

Can a quarter wave antenna have reverse harmonics?

The answer is yes (sort of), but it isn’t because of “reverse harmonics”. That doesn’t actually mean anything. Quarter-wave antennas work for the same reasons as dipoles do – due to the physics of the situation, the feed point impedance works out to be just right – about 50 ohms – and most of the power is radiated instead of reflected.

Is it possible for an antenna to have twice the wavelength?

I know antennas can have 1/4 wavelength, 1/8th etc. but if you are operating from UHF bands, can the antenna be lets say twice as long? The answer is yes (sort of), but it isn’t because of “reverse harmonics”. That doesn’t actually mean anything.

Why do quarter wave antennas work like dipoles?

Quarter-wave antennas work for the same reasons as dipoles do – due to the physics of the situation, the feed point impedance works out to be just right – about 50 ohms – and most of the power is radiated instead of reflected. Other lengths may require matching or may not work at all.

Can a VHF / UHF antenna have different orientation?

Monopole and dipole antennas (as typically used for VHF/UHF communications) emit and absorb waves with a polarization the same as the orientation of the wire/rod.