1078 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1952 



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0.1 0.2 0.3 0.4 0.6 0.8 1.0 2 3 4 5 6 8 10 20 30 



DISTANCE FROM TRANSMITTER IN MILES 



Fig. 7 — Measured path loss at 450 mc in ]\Ianhattan and the Bronx and suburbs. 

 (Note: Data for 10 miles and greater were taken on Route 1 toward New Rochelle 

 and on Route 10 toward Dover.) 



distance are a summation over many different locations rather than a 

 set of samples covering one location. 



The data for ten miles and further from the transmitter were taken 

 on routes through suburban areas. The losses at twelve miles appear to 

 be less than the average trend indicated by the curves. This is because 

 data taken at the top of the First Orange Mountain weigh heavily at 

 this distance. It is of interest to note that the losses at distances of ten 

 miles and over are 6 to 10 db less than might have been predicted from 

 the trend at smaller distances, where the measurements were made in 

 city areas. This probably reflects the fact that there is a considerable 

 difference in the character of the surroundings, such as height and num- 

 ber of buildings in the suburban territory as compared with the city 

 itself. 



The median curves of loss have been replotted for three frequencies 

 on Fig. 9. This permits a better comparison uith frequency. Except verj'- 

 close to the transmitter, the performance at the various frequencies seems 

 to differ by an essentially constant number of db, while exhibiting the 

 same trend with distance. The similarity between frequencies is appar- 



