CAS-DISCIIARGE TRANSM IT-RECEIVE SWITCH 



93 



and 



52 = 



klB 



(9) 



when the Jf?'s and X are replaced by their reciprocals and transformed from 

 a shunt to a series circuit. 



The equivalent circuit is shown in Fig. 37, where for convenience every- 

 thing is referred to the cavity and the sources for receiving and transmitting 

 are represented by constant current generators, / and /„ respectively. 



The Low-Level Transmission. We are now in a position to express the 

 low-level transmission of the cavity. For this purpose we will assume that 



T R CAVITY 



o 



CRITICAL LENGTH 

 OF LINE 



Fig. 37 — Equivalent circuit of a system referred to the TR cavity 



the admittance of the transmitting branch at plane AB is infinite. The 

 available power is given by 



t2 



vail 



UiB 



while the power actually going into the load is given by 



Pout — 



fhB 



(10) 



(11) 



(12) 



(5o + 5i -f- hY-B"- 

 the power transmission ratio defined as T is given by 



T = 45i52 



(5o + 5i + 8,y ' 



One additional expression is desired. This is the ratio of cavity input 

 resistance to the resistance of the input circuit. This is evidently the 

 reciprocal of the conductance ratio and is given by 



5i 



5o + 82 



(13) 



