now a very good day everybody i've been promising for a while
to do a three or four part series on antenna modeling so what we're gonna do today is this
is the beginning of a three or four part series we're going to do is show you how to get the
software modeling that i use and we'll give you a brief overview and i'll keep it really short
really sweet and very easy so stick around if you want to know any more of these so all i'm
going to do is i'm going to internet running at the moment i'm going to do m-m-a-n-a-g-a-l
down load okay because that's what i'm after and uh i think i'm after this second hit here
and i seem to remember halfway down here there it is download mma blah blah blah basic version all
right so let us download that so all you do is you unzip that and install it anywhere you like
even on a zip drive it's completely transportable once you've done that we can shut this down here
and i'll fire it up like i've just installed it as you have so i'll maximize this so you can see what
the hell i'm doing for some reason it starts on this tab and if you have never seen this before
you go where the hell do i start what do i do so we've got four tabs here one two three and four
so the geometry tab is where you would type some numbers okay then we can view our antenna
and we can zoom it in and out from here this shows you the calculations that we've done
and this will show you a really cool far field plot all right so i think what we should do is
at least build one really simple antenna there we are we will build an antenna about two ten point
two meters long and although it's not important we do this you can actually just
type the prob the probable target frequency that we're after just there where it says 7.2
so this would be a 40 meter vertical it says z2 because z1 is sitting on the ground so this would
be a ground mounted vertical and we can see that ground mounted vertical if i unzoom this
i used to sometimes wonder what that z meant anyway you can then hold the control key down and
click with your mouse and you can drag that down a wee bit and then with your mouse you can rotate it
as well not that we really want to rotate a single vertical be a bit pointless all right the moment
we're not doing anything it doesn't know where the coax our feed point is installed so there's
two ways of doing this we can either right click that and add a source to the beginning of the wire
or we could have gone into the geometry tab and we could have just typed what it's done for us
that wire one at the base it says here is the coax connected and that's it you have now made
your first antenna all right so we'll go to the calculate button you can tell it it doesn't make
much of a difference let's make this out of copper wire and we will say that we've got 16 quarter
wave radials on the ground and we hit the start button and by magic it's given us some numbers
then the third fourth tab if you remember i said we didn't have anything but now you can actually
see it's done something we've got a big circle on the left whatever that means and then we've got
this funny thing on the right it would help you to realize that if i hit the far field plot i'll
maximize that as well and control i can do this zoom it up as well you can see that looking down
from the top there's our circle and looking from the side we can see that these gain these lobes
all right which are over here you can click and drag your cursor around here to show what the uh
likely gain is in terms of its um reference to uh dbi so that is your first antenna all right
and it just shows you some of the basics so next time we'll do some dipoles and maybe some loops
and then what we'll do is we'll get into some really heaviest stuff elevated radials
and whatever hopefully that's give you an inkling about how this works there's a lot more under the
hood as they say in america that should inspire you good enough for today all right i will see you
on the next one where we'll make some more stuff all the best bye for now m-m-a-n-a three claps
you