Re: NEC-LIST: newbie question: split sources

Dan, in your reply to Andrew you refer to a "built-in Leeson correction
algorithm". I have always understood that this is/was something that was
arrived at empirically, not something that was derived from rigorous
analysis. Perhaps you could comment on this issue.

Malcolm M Bibby

----- Original Message -----
From: "Dan Maguire" <bethdan_at_pacbell.net>
To: <nec-list_at_gweep.ca>
Sent: Tuesday, February 25, 2003 4:44 PM
Subject: 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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> The NEC-List mailing list <nec-list_at_gweep.ca>
> http://www.gweep.ca/mailman/listinfo.cgi/nec-list
>

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