and the Fourth Old wife said "its really the force exerted on a far point,
as you sum up effect of each current in each part of the antenna" as she
pulled down the laundry off of the longwire. "It is a summation of all the
little ones (she means currents), and then you get a field" says she,
walking back the the radio shack with he head just a buzzing with
electrons.(yea ... she bonkers) She was my Fields Proff too.


"Richard Harrison" wrote in message
...
Richard Clark wrote:
"What is the Q of her mud?"

First, the Q of mud is likely less useful than antenna Q. That is, not
worth much.

Second, Q depends on mud consistency, temperature, location, and
frequency of interest.

The earth behaves like a lossy capacitor. Above 10 MHz, the capacitnce
in ordinary soil bypasses the resistance of the soil. Below 10 MHz,
conductance of the soil shunts the capacitance making soil capacitance
(permittivity) less important.

Soil as a lossy dielectric has a dielectric constant which is defined
as the capacitance with dielectric material filling the void versus the
capacitance without the dielectric material.

Thickness of a mud layer is relevant. At medium wave and lower
frequencies, where the earth is mainly resistive, r-f renetration of the
earth, not sea water, is so deep that rain wetting has little effect on
propagation or refleection. But, at h-f, penetration of the earth is
shallow. Water and salt content are significant to penetration and loss.

An ideal capacitor is lossless. There`s no dielectric leakage nor
conductor loss resistance. Earth is not ideal.

Capacitor quality is judged by how much its current`s phase angle
deviates from 90-degrees lead of the applied voltage. This deviation
angle is called the capacitor`s "phase angle". The tangent of this angle
is called the "dissipation factor". The reciprocal of this dissipation
factor is the Q of the capacitor.

As mud is wet soil, it has Q, but not just one Q value.

Best regards, Richard Harrison, KB5WZI