[NLRS] Info on microwave propagation

[jcplatt1 at mmm.com]

I was doing some internet searching over the lunch hour on "Great Lakes"
and microwave propagation.   Here is one interesting article that is
somewhat informational.   It has one point of interest regarding microwave
refraction index around the Great Lakes .... where is a cut & paste of that
section:
                                                                            
                                                                            
                                                                            
  CLIMATE EFFECTS                                                           
                                                                            
                                                                            
  Atmospheric refraction varies widely, depending on the local climate.     
  Microwave paths that demand high reliability are often studied not only   
  at a K-factor of 1.333, but also at 0.5, 1.0 and 20. The Radio            
  Propagation Handbook by Peter Saveskie, published by TAB Books (Editor's  
  note: TAB Books is now the TAB Electronics group of McGraw-Hill), has an  
  appendix showing the K factor at various locations during different times 
  of the year. Interestingly, areas around the Great Lakes are especially   
  prone to unusually high K factors certain times of the year.              
                                                                            
                                                                            


Here is the link to the full article:
http://www.tvtechnology.com/features/On-RF/f-DL-signals.shtml

It may be interesting to tracked down the radio propagation handbook
referenced above to check out that appendix.

Jon C. Platt
3M Medical Div. QA Manager
270-5N-01
Tel:  651-736-1850
Fax:  651-733-2009