[TowerTalk] Arrival angles and sunspot number

[Pete Smith]

At 09:10 PM 4/24/00 -0400, Tom Rauch wrote:
>> > Maybe someone else knows, but didn't Dean assume low or 
>> > modest antenna heights?
>> 
>>  N6BV assumed dipoles at 100 ft for 80 and 40M,
>>  Yagi's at 100 ft for 20 and 17M, Yagi's at 60 ft
>>  for 15, 12, and 10M, at BOTH ends.
>
>Well then that answers that. The model will be prejudiced.
>
>But Pete, you have me confused. What is an isotropic source with 
>gain, and how can you have one near earth?

It's like an uggerumph, I suspect.  In VOACAP, it is called a "constant
gain isotrope."  If you could see it, it would look like a perfect
hemisphere with equal gain in every direction.

The beauty, of course, is that it adds no biases to the propagation
prediction at all, other than whatever amount of path gain you add at
either end.  No nulls at very low angles, or above the first lobe, to cut
into the received signal strength at those angles.  

73, Pete Smith N4ZR
n4zr@contesting.com 

Don't forget to update your entry on the World Contest Station Database,
now at http://www.contesting.com/stationdatabase.htm

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