GAS-DISCBARGE TRANSMIT-RECEIVE SWITCH 



77 



better the over-all performance of the system.* Any basic improvement in 

 Q can be reflected either in a lowering of the leakage power or in a reduction 

 of the low-level loss, as may be desired. 



Variations in the Q between tubes used in a given cavity of fixed design, 

 are, however, seen as variations in the low-level loss only and have no 



5 12 

 o 



4 6 ( 



TIME IN MICROSECONDS 



Fig. 30 — The ATR recovery effect 



noticeable efifect on the leakage power. This may be understood by refer- 

 ence to the equations derived in appendix A. The performance of a some- 

 what idealized TR box may be expressed in terms of three design parameters 

 5o, 5i and So which relate respectively to the properties of the cavity, its 

 input coupling, and its output coupling; and in terms of a gas discharge 

 parameter Pq. In terms of these new parameters the in-tune low-level 

 tansmission of a TR box is given as a power ratio by 



T = 



48182 



[80 + 5i + 52]^ ' 



(12)t 



* As explained later in this section, band width limitations set an upper limit to the 

 permissible Q. 



t Numbered equations in the text correspond with the numbers used in the appendices. 



