Thanks for that info Bill. I will download it and try it out!
I forgot to mention AO in my previous reflector post – an EXCEPTIONAL program!
NW was very good as well.. Brian was decades ahead of his time!
Tnx & 73
Bob KQ2M
From: Bill Cotter
Sent: Tuesday, March 13, 2018 8:36 PM
To: towertalk@contesting.com ; Bob Shohet, KQ2M
Subject: DOSBOX: YO, AO and TA
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 K6STI’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, I’m not
>sure why someone hasn’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 “pooh-poohed†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 “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 >
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