Bob,
I still use K6STI's fabulous YO, AO and TA for
all my antenna projects. I found that if you
install DOSBOX (free) you can run the programs in
a native environment under Windows 7 & 10, on a
FAST computer. Give DOSBOX a try and you can get
rid of that old DOS 3.x machine!
https://www.dosbox.com/
I never used NW, but it sounds like another great
program from Brian. I think he was way ahead of his time.
73 Bill N4LG
At 06:03 PM 3/13/2018, Bob Shohet, KQ2M wrote:
I was fortunate to be using K6STIâ??s YO and TA
programs to model my antennas over my incredibly
complex terrain. I found no equal program when
it came to the combination of modeling antenna
stacks over terrain files that you could easily
construct and use. Of course it runs only in
DOS which is one of the reasons that I continue
to maintain my two DOS based computers. I stayed
with YO and TA precisely because it did not
compromise stack modeling or terrain
modeling. And it was/is amazingly accurate. I
also found the NW program to be very useful to
model and build wire beam, 4-square and phased
vertical antennas. It was also great for
modeling and designing phased beverages back
about 15 years ago. With the incredible advances
in technology and knowledge over the past 20+
years since K6STI created his program, Iâ??m not
sure why someone hasnâ??t yet designed a Windows
program that can accurately model any
combination of wl phasing with any combination
of antennas over any type of terrain from a
terrain file that you create
yourself. Certainly the need and demand for
such a program is there especially given just
how many people who â??pooh-poohedâ?? the idea
of such a program decades ago would gladly pay
for such a program today! Bob KQ2M From: Grant
Saviers Sent: Tuesday, March 13, 2018 5:48 PM
To: towertalk@contesting.com Subject: Re:
[TowerTalk] add a 3rd el to 40-2cd One caveat
for "terrain analysis" is that HFTA does not
model stacks well around 1/4 wl and less
separations. So that leaves NEC/EZNEC which
does give accurate results but over flat
terrain. It will also provide better gain and
elevation patterns and for the specific antenna
rather than the HFTA generic "point source"
model. The ability to model interactions with
other antennas is pretty useful. I modeled my
stacks both ways. Is somebody out there
reprogramming the "dusty deck" Fortran HFTA for
the 21st century? A worthy project now that we
all have beyond Cray super-computer laptops.
Grant KZ1W On 3/13/2018 10:12 AM, Bob Shohet,
KQ2M wrote: > I respectfully have to disagree
with Steve on this. > > Stacking with a lower
antenna is highly unlikely to produce a lower
wave angle. So a Full-sized 3L will still be
almost always superior to a 2L at the same
height and that extra 1 2 db at the righht
angle at the right time with the full-sized 3L
antenna could be significant. What stacking
might give you is a higher (than the 3L) wave
angle that is useful to some population area of
contesters that you will now be louder
into. And it will give you potentially three
different wave angles to choose from if you
phase them and have Upper, Lower or Both
switching. However, you will have a less
broadband antenna with reduced F/B and F/S which
could handicap you when dealing with qrm and
qrn. > > And you will have to put that 2nd
antenna very low to get meaningful wave angle
choices and those wave angles may not be very
useful especially for working DX. > > Every qth
is different with different topography,
terrain and other faactors to take into
consideration. Everyone should do extensive
modeling with your own specific terrain BEFORE
seriously considering stacking a 2nd antenna to
see if it is even worth considering. And you
also need to consider the additional wind load
on the tower and whether or not what you have up
in the way of tower and guys will support that
additional â??wind-sailâ??. :-) > > 73 > >
Bob KQ2M > > From: k7lxc--- via TowerTalk >
Sent: Tuesday, March 13, 2018 12:54 PM > To:
bmarx@bellsouth.ne ; towertalk@contesting.com >
Subject: Re: [TowerTalk] add a 3rd el to
40-2cd > > >> With one antenna at 72 ft why
not just add new antenna lower on the
tower>? > > One of my all time favorite
ideas. Stacked would give you similar
performance to a full sized 3L plus you get
angle and directional diversity. And you don't
need expensive rotators! Like my old buddy Mark,
AA6DX sez: "Worky, worky!" > > Cheers, >
Steve K7LXC >
_______________________________________________ >
> > >
_______________________________________________ >
TowerTalk mailing list >
TowerTalk@contesting.com >
http://lists.contesting.com/mailman/listinfo/towertalk
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