APPLICATION or WIRE TRANSMISSION TO RADIO 135 



repeaters and the shore radio stations which are in effect huge re- 

 peaters rehaying between the land line and the radio circuits. 



Because of the moderate attenuation obtaining in the wire trans- 

 mission system, we can work with fairly long repeater spacings, about 

 300 miles in this case, and with moderate amounts of power and yet 

 keep the transmission levels at the receiving end relatively much 



WIRE AND RADIO REPEATER SYSTEMS 



TRANSMISSION LEVEL DIAGRAM 

 Wire Transmission f=l K.C 

 Rad lolransmission f ■- 1000 K C 



-l-£^ 



Fig. 8 



higher than is usual in radio systems. Due to the large attenuations 

 obtaining over the radio extensions, the radio repeaters must put out a 

 high transmission level, making them costly, and even with this rela- 

 tively high output, the level drops to very low values at the receiving 



