need info on how to modify a sirio sy27-4 for 10m

[Henry HPSD]

ps Marconi...u were worried about tapering.

Search on "mininec" and see what the conclusion is about tapering using that engine.

Examples who use mininec -> mmana, antenna modeller, those are the two famous...but there are others.

hope it is of use,

H>

 

[Henry HPSD]

Ehm..

With the knowledge provided after research.

Another thing will spring to mind....
You can find out there are manufacturers out there making delta loop antennas
Where they model them using for example a eznec + version using a nec2 engine.

The delta loop excist out of two heavy duty inch pipes pointing upwards and a top wire between them. Hence large diameter difference.

Now, do yourself a favour.

Model a single delta loop with those diameters and test them in NEC2 and MININEC.

You will see NEC2 is not capable of handling that accurate.
The manufacture has spend money on software that looks "nice", but he might consider using Mininec for his application.

Where it is perfectly possible to design a multi element delta loop with 50 ohms impedance the manufacturer will "stick" to his gamma-match simply cause he doesnt really understand what is going on.

Isnt it addicting to find out how and what is going on ?

Kind regards,

H>

 

[Robb]

Ohhh . . . 'MOM' . . . I get it now . . . thanks - Bob and Henry.

Mininec is used most often then?

 

[Henry HPSD]

Ehm...well...its more or less a draw.
Its either mininec or nec2 for the free software that is commonly used.
With each having there own situations to be "best".