160 meter
straight dipole impedance versus height and ground properties. Data is taken
from EZNEC+ simulations.
Notes - Poor ground is typically a dry sandy and rocky area (0.002 S/m Dielectric 10) - Medium ground is typically a pastoral heavy clay (0.007 S/m Dielectric 15) - Good ground is typically wide area deep wet clay (0.030 S/m Dielectric 20) - The impedance is the radiation resistance (real part R) in the resonance frequency where the reactance X is zero - The radiation resistance can't be tuned by adjusting the length of the dipole wires - The impedance is depending on the height and on the ground properties - Inverted-V will lower the impedance depending on the slope of the wires - The graphs are turning up in low heights which represent ground losses with poorer ground 2020-10-05 OH7SV Back to OH7SV ham project |