[TowerTalk] More on Half Wave (and HFTA)

[Joe Subich, W4TV]

On 2019-01-19 4:43 PM, Jim Brown wrote:
 > BTW -- the terrain data is a plain text file, and can
 > be manually edited. It's been more than 10 years since I did it, so I
 > don't remember format of that file, but I did generate one radial of
 > data by taking points off of a topo map.

A pair of numbers on each line ... distance,height
One line per point ...

The distance values need not be evenly spaced but they do need to
be "in order" (increasing).

73,

    ... Joe, W4TV


On 2019-01-19 4:43 PM, Jim Brown wrote:
> Thanks Shawn.  Yes, Dean told me the same things., but he also advised 
> me to run a lot of simulations to find those that didn't have that 
> spatial aliasing.  BTW -- the terrain data is a plain text file, and can 
> be manually edited. It's been more than 10 years since I did it, so I 
> don't remember format of that file, but I did generate one radial of 
> data by taking points off of a topo map. It might be possible to 
> manually edit a file to use different point spacing along different 
> parts of the radial.
> 
> The links to the modeling software within your older post seem to be dead.
> 
> 73, Jim K9YC
> 
> On 1/19/2019 10:17 AM, Shawn Donley wrote:
>> Since terrain effects have entered the discussion, here's my 2 cents 
>> (probably less) on the subject.   Like any modeling program, be 
>> careful interpreting HFTA results.   See my earlier post at:
>>
>>
>> http://lists.contesting.com/archives//html/Towertalk/2016-07/msg00350.html 
>>
>