NEC-LIST: newbie question: split sources

Hi Andrew,

Others on this list have been chided in the past for mentioning commercial
programs, so it is with some hesitation that I give this response. However,
you may be interested in a program called MultiNEC. MultiNEC can implement
split sources using the public-domain NEC-2 engine or using the NEC engines
that are included with the various Nittany Scientific products. You can
also use split "current" sources that require two EX cards, two NT cards,
and the proper interpretation of the NEC output listing.

The MultiNEC program can import your existing NEC model, with certain
restrictions. You can then make multiple runs while having the program
automatically change the model between runs in any way you care to specify.
This may be similar to what you are doing now with your Java code. Since
you say you have been using EZNEC you can also just import your existing
EZNEC model. Then you can take advantage of the "multiple runs with
automatic changes" feature of MultiNEC while continuing to use the EZNEC
engine. This might be advantageous if your model has stepped-diameter
elements, like a Yagi made with telescoping aluminum tubing, since EZNEC has
a built-in Leeson correction algorithm. (Using MultiNEC with EZNEC assumes
you are not using the free demo version of EZNEC. By design, MultiNEC will
not interface with the free versions of EZNEC or NEC-Win Plus.)

MultiNEC is shareware but you can register for the amateur-friendly price of
US $39. For more information see www.qsl.net/ac6la/. MultiNEC requires
Microsoft Excel 97 or later.

BTW, your proposed solution of manually placing two voltage sources on
adjoining segments and then merely adding the real and imaginary components
of the two reported impedances from the NEC output listing is correct.

Dan AC6LA

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