How are spurious oscillations generated in TWT amplifier? State the method to suppress it.

• In  a  TWT,  adjacent  turns  of  the  helix  are  so  close  to  each  other  and  hence oscillations are  likely  to  occur.    
• To prevent these spurious signals some form of attenuator is placed near the input end of the tube which absorb the oscillations.

State the applications of TWT:

1. Low power, low noise TWT’s used in radar and microwave  receivers
2. Laboratory instruments
3. Drivers for more powerful tubes
4. Medium  and  high  power  CWTWT’S  are  used  for  communication  and radar.