[TowerTalk] ALL THE RIGHT ANGLES ?

[Pete Smith]

At 11:02 AM 8/11/98 -0400, w8ji.tom wrote:
>
>Great Tom!
>
>I'm glad you also caught the serious flaw in the method used! Too many
>people rely on flawed measurements for critical information! 
>
>> ALL   THE   RIGHT   ANGLES ?
>> 
>> YES and NO !
>> 
>> N6BV  used  100 ft elevation for his 80, 40 and 20 meter models,
>> and 60 ft elevation for 10 and 15 meters, at both ends of the path.

Am I the only one who recalls N6BV explaining that he used thousands of
IONCAP runs to develop the arrival angle data for "All the Right Angles?"
I use the VOACAP version of IONCAP, and as far as I can tell it doesn't
factor the height of the transmitting and receiving antennas into its angle
computations.  Instead it makes arrival angle predictions based on
frequency and the height and intensity of the ionospheric layers along the
path.  

I would agree with N4KG on one point, though -- it seems obvious that under
some circumstances the antenna at one or both ends of the circuit would be
so much too high or too low that it would discriminate against the best
propagation mode so much that a secondary mode could actually be stronger.
In these golden days of 150+ solar flux,  that probably will happen more
than when the sun is less kind.
  



73,  Pete Smith N4ZR
In wild, wonderful, fairly rare WEST Virginia

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