"Reg Edwards" wrote in message
...
Frank,

To complete the graphs of Rin + jXin versus length for one radial, I
need data for lengths between 0.5 metres and 2 metres at intervals of
0.2 metres.

Could you oblige please?

The nice smooth graphs I have produced so far are free of
'measurement' errors which could be attributed to your hard, tedious
work.

The uncertainty due to NEC4 is as yet unknown. In the NEC4 model of a
single radial, what is the length of the short bits of radial used to
model it? Alternatively, into what number of short lengths is the
radial under test divided?

No problem Reg, here are the data you requested:

0.5 m -- Radial Z = 167.6 - j 161.0
0.6 m -- Radial Z = 146.6 - j 136.3
0.8 m -- Radial Z = 115.9 - j 102.3
1.0 m -- Radial Z = 101.4 - j 79.1
1.2 m -- Radial Z = 89.4 - j 61.5
1.4 m -- Radial Z = 80.9 - j 57.2
1.6 m -- Radial Z = 74.6 - j 35.0
1.8 m -- Radial Z = 70.2 - j 24.1
2.0 m -- Radial Z = 67.2 - j 14.2

Concerning your previous question about the Smith Chart.
It is a powerful visual aid which gives a better understanding
of what is really happening to the impedances. Exactly what
I got out of graphing the data was really only a confirmation
of the expected spiral toward Zo. Also the "zero-crossing"
which occurs at quarter-wave multiples.
Normalization of the data (Division of each complex datum
by the complex Zo), and linear graphing, will also provide
the same information; including the gradual approach to the
normalized Zo of 1 ohm.

Where the Smith Chart really proves its worth is in the
design of matching networks involving: L, C, R, and
transmission lines. It is hard to imagine how anybody
could do such design without this aid. I am not sure
if anybody actually uses the paper versions these days,
but the software equivalent, combined with programs
such as (Now Agilent's) Eagleware, are pretty much
design lab standards.

In this model all segments are a constant 10 cm in length.
The number of segments will therefore be L(m)/0.1.

Frank