Frank wrote:
"dansawyeror" wrote in message
...
Frank,

A 'target' coil is 300mm x 300mm of 5/16 copper tubing. It is about 50
feet of tubing, a .5 pitch, and should be close to 75 uH. This should be
close. From there simulation should show the best performance between
varying the coils.

Thanks - Dan

Having trouble producing a good model Dan. NEC 2 indicates Qs which are
5000, but no warnings or errors. I can run it in NEC 4.1, single, and
double precision, but I get over 400 warnings in the NEC output file; such
as:

SEGCHK: WARNING - SEGMENTS 1 AND 271 CROSS AT A MIDPOINT WITH SEPARATION
LESS THAN THE SUM OF THEIR RADII

SEGCHK: WARNING - THE CENTER OF SEGMENT 1 IS WITHIN THE VOLUME OF SEGMENT
271

These warnings are particularly strange since, for example, absolute
segments 1 and 271 are almost 12" apart in the model. Will see what I can
do to correct the error.

73,

Frank

The code I am using is as follows:

CM Inductor Q Calculation
CE
GH 1 300 1 12 6 6 6 6 0.3125
GW 2 5 6 0 12 0 0 12 0.3125
GW 3 10 0 0 12 0 0 0 0.3125
GW 4 5 0 0 0 6 0 0 0.3125
GS 0 0 0.025400
GE 0
EX 0 3 5 00 1 0
FR 0 5 0 0 3.7 0.02
LD 5 1 1 320 5.7001E7
RP 0 181 1 1000 -90 90 1.00000 1.00000
EN

NEC-2 and NEC-4 have different formats for the GH 'card'. This is the
NEC-2 format, which will be interpreted differently by NEC-4. See your
NEC-4 documentation for the correct NEC-4 format.

Roy Lewallen, W7EL