[TowerTalk] C31XR modeling question

[K9MA]

NEC3 doesn't model closely spaced wires well, so it may not work for the 
matching system. NEC4 should work.

Another way, which should work with NEC3, is to model the feed assembly 
as a transmission line. All you have to do is estimate the 
characteristic impedance, which probably isn't too critical. The length 
should be the physical length.

73,

Scott K9MA



On 5/19/2019 17:51, jimlux wrote:
> On 5/19/19 3:29 PM, Tom Hellem wrote:
>> Has anyone ever tried to model in EZNEC a C31XR tribander, the one 
>> sold by
>> JK ?
>> I would specifically like to know how to model the feed system which
>> consists of two pieces of aluminum angle that connects the feed 
>> terminals
>> of the 3 driven elements.
>>
>
> Since they advertise modeled patterns on the website, have you asked 
> JK for their model files?
>
> I don't know if they're advertising gain in QST, for which they'd have 
> either model files supplied to ARRL, or measured data.
>
> I didn't see this antenna listed here
> http://www.arrl.org/antenna-modeling-files
>
>
> In general, you should be able to model it as a wire connecting the 
> appropriate points.  Set the wire diameter so that the surface area of 
> the wire is the same as the mounting bracket's. That way the skin 
> effect losses work out the same.
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-- 
Scott  K9MA

k9ma at sdellington.us