HANNA: DESIGN OF TRANSMISSION LOSS EXPERIMENTS 



I think one thing that we might want to do is to apply some 

 common filter functions to propagation loss models, so that the time 

 averaging used in the experimental data would correspond, say, fairly 

 closely to some sort of averaging in the model of propagation curves. 



Dr. Hanna: I don't disagree with what Gerry said, I just make 

 the observation that for the two examples of CW data and CW calcula- 

 tions that I showed, the resolution in range, if you like, was com- 

 parable between the data and the calculation in both of those cases. 



The first case that I showed represented a problem, if you like, 

 only because there were not enough experimental points with that 

 resolution. If those points had, say, been taken with an equivalent 

 range average of a mile or so, the model could have been run that 

 way and an interesting comparison made. But, unfortunately, given 

 the apparent underlying structure, you are faced with an under-sampled 

 curve and there wasn't a lot which you could do with it. 



I don't mean to cast negatively on the experimentalists at that 

 particular point, but just to show that as an example of the kind 

 of difficulty that can arise without anticipating what the function 

 looks like that you are trying to measure. 



Dr. Hersey: I should amend my comments, Ira, by saying, of course, 

 the models that we are talking about become considerably modified by 

 the addition to them of the punitive system characteristic. But we 

 have done that. 



Dr. Dyer: We haven't talked much about that. 



Dr. Hersey: You are dead right, and I am disappointed. 



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