APrUCATION or WIRE TRANSMISSION TO RADIO 125 



In the wire system the minuinuin power requirement may be 

 expressed directly in terms of a power, or — as it is usually — a current, 

 in the recei\ing apparatus, the "transfer" between the line and the 

 receiver being a constant and efficient relation. In radio the power 

 delivered out of the ether or "line" into the receiving antenna is so 



RADIO TRANSMISSION LEVEL DIAGAM 



CD 



.01 watt. 



in 

 o 



Fig. 4 



largely a function of the antenna dimensions that it is necessary to 

 express the necessary received power in terms of the received field, 

 usually, simply as a field intensity — and not as a certain current in 

 the terminal apparatus. Of course, the transmission loss occasioned 

 by getting from the "ether" into the receiving circuit does not affect 



