REGENERATION OF BINARY MICROWAVE PULSES 



75 



Fig. 6 — Effect of regeneration on disturbances which occur at only one re- 

 peater. A — Input to regenerator, original signal. B — ^ Output of regenerator, 

 first trip. C • — Oi^tput of regenerator, 24th trip. 



except that the oscilloscope sweep has been contracted in order to show 

 the progressive effects produced by repeated passage of the signal through 

 the regenerator. Fig. 5B shows that after the pulses have passed through 

 the regenerator only twice all visible effects of the disturbances have 

 been removed. Fig. 5C shows the effect of simply increasing the RF 

 pulse input to the regenerator by approximately 4 db. The small "noise" 

 pulse which in the previous case was quickly dropped out because of 

 being below the slicing level has now come up above the slicing level 

 and so builds up to full amplitude after only a few trips through the 

 regenerator. Note that in the cases shown in Figs. 4 and 5 discrimination 

 against unwanted pulses has been purely on an amplitude basis since 

 the gate has been unblocked to pulses with amplitudes above the slicing 

 level whenever one of these distiu'bing pulses was present. 



For Fig. 6A conditions are the same as for Fig. 4A except that an ad- 

 ditional pulse has been added to simulate intersymbol noise or inter- 

 ference. Fig. 6B indicates that after only one trip through the regenerator 

 the effect of the added pulse is very small. After a few trips the effect 

 is completely eliminated leaving a practically perfect group which con- 

 tinues on for 24 trips as shown by Fig. 6C. For the intersymbol pulse, 

 discrimination is on a time basis since this interference occurs at a time 



