134 



BELL SYSTEM TECHNICAL JOURNAL 



The survey work described above did not go so far as to include a 

 study of the distribution effected from a location well outside of the 

 suburbs. The philosophy of such a location is, of course, that of 

 attempting to encompass within the range of the station a wide- 

 spread area and of so including the city within the area as to effect 

 a more uniform distribution over it than is possible when transmitting 

 from a location within the city. A theoretical study was made of the 

 distribution to be effected from one such location in the general 

 vicinity of Boonton, New Jersey, using attenuations obtained in the 

 other surveys. Such a location would be somewhat similar to that 

 of WJZ at Bound Brook, although the distance from Boonton to New 

 York is less. The figures derived upon the basis of a 50 kw. broad- 

 casting station are as follows: 



Percentage of Receiving Sets 

 Field Strength in Metropolitan Area 



Below 10,000 yuv./m 10 per cent 



Between 10,000 and 50,000 ^v./m 79 per cent 



More than 50,000 ^v./m 11 per cent 



These figures show a good concentration in the most desirable field 

 strength values. They should be discounted somewhat because they 



Fig. 10 — The effect of non-steel apartment house building in shielding radio 



reception within it 



