80 meter full wave loop impedance versus height and ground properties. Data is taken from EZNEC+ simulations.


Simulated with the feeding point in the middle of one side.
The impedance is abt the same with corner feeding.

Notes
- Poor ground is typically a dry sandy and rocky area (0.002 S/m)
- Medium ground is typically a pastoral heavy clay (0.007 S/m)
- Good ground is typically wide area deep wet clay (0.030 S/m)

- 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 wire
- The impedance is depending on the height and on the ground properties
- The graphs are turning up in low heights which represent ground losses

2021-04-22 OH7SV

Back to OH7SV ham project