[TowerTalk] HAAT calculator

[K4SAV]

Just to illustrate N4ZR's comment, I fired up HFTA and created a 
fictious terrain, one that a very good local terrain near the antenna, 
but had a lot of high stuff in the distance.  If you used the website 
for calculating HAAT of this terrain, it should give you -270 ft. Sounds 
bad, huh?

I used a dipole at 14MHz and compared the response of this dipole to a 
dipole over flat ground.  At an elevation angle of 6 degrees, the dipole 
over my special fictious terrain beat the dipole over flat ground by 12 dB.

Jerry, K4SAV


Pete Smith wrote:

>For HF operation, HAAT is fundamentally irrelevant.  Average terrain elevation from 43KM to 16 KM is, at most, only a small part of the picture.  The best tool available for hams is HFTA (HF Terrain Analysis), which relates the effects of local topography to the arrival angles of the desired signals.  
>
>Line-of-sight frequencies are a different matter, of course.
>
>73, Pete N4ZR
>
>  
>