[Amps] MOSFET amp filtering - was: auto-tune

[Tom Thompson]

Jim,

I looked at your presentation and "take off angle" is not mentioned, but 
angle is.  Granted the gain of a ground mounted vertical with radials 
has more gain as the ground becomes better, but I see the angle of 
maximum gain getting lower, also.

Tom   W0IVJ


On 12/12/2016 8:34 PM, Jim Brown wrote:
> Tom,
>
> "Take-off angle" is a highly flawed concept for trying to understand 
> how antennas work. Take a look at the links I posted. You won't see 
> the words "take off angle" anywhere in the discussion. Rather, I've 
> modeled the vertical and horizontal field strength performance as 
> these soil and height parameters are changed and plotted the results 
> on the same axes. When you do that, you learn what really happens.
>
> 73, Jim K9YC
>
> On Mon,12/12/2016 7:03 PM, Tom Thompson wrote:
>>
>> Jim,
>>
>> /Lousy soil does NOT vary the vertical angle, it simply attenuates 
>> the signal.  In the near field, it burns transmitter power by warming 
>> the worms. In the far field, it degrades ground wave and weakens the 
>> first reflection that creates the vertical pattern./
>>
>> Lousy ground does raise the take off angle of the maximum point on 
>> the lobe of a vertical.  EZNEC shows the maximum point on the take 
>> off lobe going from 18 degrees with very good ground to 26 degrees 
>> for rocky mountain ground.
>>
>
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