From: (Ulrich Weiss)
Date: Wed, 23 Jun 2004 13:40:40 +0200
List-post:

hello Arie,

thanks for your contribution... your figures come very close to my empirical
data when analysing dipoles (of exactly the same length in exactly the same
place on the same day in bright sunshine all day) for 14 MHz using different
kinds of materials, insulations, thicknesses, diameters etc....
obviously there is a flaw in Roys formula as well... some people erroneously
think that he employs NEC/4 with EZNEC 4.0 when taking wire insulation into
consideration...

regards

Uli, DJ2YA


"Roy Lewallen" wrote in message

EZNEC, EZNEC+, and EZNEC-M, of all versions including version 4.0, do
not use any part of NEC-4 for any calculations. The geometry check and
the wire insulation features perform the same functions as similar NEC-4
features, but they are implemented with independently written code that
is not part of, copied from, or derived from NEC-4. I have been very
careful about this, because NEC-4 is copyrighted software.

EZNEC/4 of all versions including v. 4.0 does use NEC-4 for calculations
including wire insulation. Because the EZNEC geometry check feature
detects more problems than the corresponding NEC-4 routine (SEGCHK), the
EZNEC feature is used for that function by default. However, the user
can choose to use the NEC-4 function, or both, if desired. EZNEC/4 is
sold only to people or companies who have already purchased an NEC-4
license from the copyright holder.

In the tests I've run (by no means a comprehensive group of tests), the
EZNEC insulated wire routine gives answers very similar to those given
by NEC-4. I'd be very interested in any case where they significantly
differ.

Roy Lewallen, W7EL

Jer wrote:

... some people erroneously
think that he employs NEC/4 with EZNEC 4.0 when taking wire insulation into
consideration...

regards

Uli, DJ2YA


"Roy Lewallen" wrote in message

EZNEC, EZNEC+, and EZNEC-M, of all versions including version 4.0, do
not use any part of NEC-4 for any calculations. The geometry check and
the wire insulation features perform the same functions as similar NEC-4
features, but they are implemented with independently written code that
is not part of, copied from, or derived from NEC-4. I have been very
careful about this, because NEC-4 is copyrighted software.

EZNEC/4 of all versions including v. 4.0 does use NEC-4 for calculations
including wire insulation. Because the EZNEC geometry check feature
detects more problems than the corresponding NEC-4 routine (SEGCHK), the
EZNEC feature is used for that function by default. However, the user
can choose to use the NEC-4 function, or both, if desired. EZNEC/4 is
sold only to people or companies who have already purchased an NEC-4
license from the copyright holder.

In the tests I've run (by no means a comprehensive group of tests), the
EZNEC insulated wire routine gives answers very similar to those given
by NEC-4. I'd be very interested in any case where they significantly
differ.

Roy Lewallen, W7EL

Jer wrote:

... some people erroneously
think that he employs NEC/4 with EZNEC 4.0 when taking wire insulation into
consideration...

regards

Uli, DJ2YA


"Roy Lewallen" wrote in message