[BC] Conductivity breaks

[Thomas G. Osenkowsky]

The determination of conductivity was published in
Systematic Bivariate Analysis of AM Field Strength
Measurement Data, Harry R. Anderson, P.E.,
H.R. Anderson & Associates, Inc. Consulting Engineers,
IEEE Transactions on Broadcasting, Vol. BC-32,
No. 2, June 1986

The algorithm calculates conductivity using measured
field intensity at various distances to closely match FCC
published curves. Indeed, this is a matter of interpretation.
One may also use the manual method of fitting curves using
a light table, graph paper and curve paper. A change of
a few mv/m can force a different conductivity result as well
as Inverse Distance Field (IDF) result.. The cited method is
employed in the FCC's computer, EDX's AMDAT and
V-Soft's new Conductivity program.

Tom Osenkowsky, CPBE

In making field strength measurements, I've seen others' proofs and
observed myself situations where you go from a high conductivity surface
to a low conductivity surface and the FIM continues to read as though
the conductivity is still high for a little while...kind of like a wave
crashing and reaching up on the beach as far as it can go before it
retreats.  Is there an actual "name" or term for this effect?
Andrew Skotdal