[TowerTalk] DOSBOX: YO, AO and TA

[Bob Shohet, KQ2M]

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 at 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 at 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-sail”.  :-) > > 73 > > 
>Bob  KQ2M > > From: k7lxc--- via TowerTalk > 
>Sent: Tuesday, March 13, 2018 12:54 PM > To: 
>bmarx at bellsouth.ne ; towertalk at 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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