Microbit RRC-1258 MkII(s) Manual do Utilizador descarregar pdf (Página 10)

Computers in Amateur Radio

EZNEC is de-facto the amateur standard antenna modelling

package, and is relatively easy to use. EZNEC stands for Easy NEC! It

is available as a download or CD and runs on Windows version 98. ME,

2000, XP, Vista and Windows 7.

The standard EZNEC V5.0 has a 500 segment capacity; the larger

EZNEC+ V5.0 has 1500 segment capacity, allowing more complex or

accurate models. These versions have to be purchased.

A free download demonstration version with a maximum of 20

segments is available from the EZNEC website. This is also supplied with

the ARRL Antenna Handbook on its accompanying CD. The free demo

version can be used for the example about to be described, but the

number of segments will be restricted to 19 rather than the 51 used. This

results in inaccurate feed impedance and SWR values above 10 MHz.

However, if this limitation is accepted, the radiation plots are similar.

The capability to model with more segments allows more complex

models to be analysed but be aware that processing time increases

with the number of segments used.

It is impossible in this short chapter to show all the bells and

whistles available or all the caveats inherent in NEC2, but the hope is it

will wet the appetite of the reader. A full 185-page manual is available

from the EZNEC website.

Fig 4.1 shows the Desktop Icon for EZNEC. (Ver-

sion EZNEC+ V5.0) Double clicking on this produces the

main EZNEC Control Centre screen – Fig 4.2.

This has a top menu, a left hand toolbar with but-

tons and to the right of this another toolbar with buttons.

EZNEC does not allow you to start with a blank canvas, rather one

of the pre-loaded example models needs to be opened and modified

to suit the antenna to be modelled. After that, EZNEC always starts up

with last antenna modelled. This is automatically saved under filename

‘LAST.EZ’ when the program is closed. The pre-loaded models enable

the first time user

to find what each

menu item does.

Simple models of

the basic antenna

types, dipoles,

yagis, and full

wave loops are

included in the

preloaded library.

Click ‘File’

and then ‘Open’

and look for

‘BYDipole’ in the

list of supplied

Fig 4.1: EZNEC

Desktop Logo.

Fig 4.2: The

EZNEC Control

Centre Window

with the sample

model BYDipole

opened.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 29 30

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