CRYOGENIC 

 PARAMP "^ 



AMBIENT 



TEMP 



PARAMP 



05 



-< 

 CO 



m 



GAS-FET- 



OS 

 m 



PREMIUM _^ 

 TRANSISTOR 



4^ 



o 

 o 



o 



TYPICAL 

 TRANSISTOR 



o 

 S 



ANTENNA DIAMETER- METERS 

 ro jk o> 00 o 



1^ 

 OJ 

 00 

 Q. 

 CD 



P 

 CD 



ro 



Q. 

 W 



ANTENNA GAIN AT 1690 MHZ 



Figure 2.— 



Antenna diameter as a function of system 

 noise temperature for various numbers of 

 channels. 



58 



