REFLEX OSCILLATORS 



523 



Figure 39 shows the performance chart of Fig. 38 as it would appear with 

 the impedances evaluated at a point 5 wavelengths away from the resonator. 

 Figure 71 of Section XIII shows an impedance performance chart for 2K25 

 reflex oscillator. 



— -i^K^i 



Fig. 38. — The Rieke diagram of Fig. 37 transformed to apply to the oscillator loaded 

 for optimum power at unity standing wave. 



B. Frequency — Sensitive Loads — Long Line Efect 



When the load presented to a reflex oscillator consists of a long line mis- 

 matched at the far end, or contains a resonant element, the operation of a 

 reflex oscillator, and especially its electronic tuning, may be very seriously 

 affected. 



For instance, consider the simple circuit shown in Fig. 40. Here Mr 

 is the characteristic admittance of the reflex oscillator resonator as seen 

 from the output line or wave guide and Ml is the characteristic impedance 

 of a line load I long, so terminated as to give a standing wave ratio, <r. 



