FACTOID # 164: If you're looking to invade someone by sea, try Canada! Canada has only 9000 Navy personnel guarding the longest national coastline in the world.
 
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A TWTA or travelling-wave tube amplifier is an electronic device used to produce high-power radiofrequency signals. The bandwidth of a broadband TWTA can be as high as one octave, although tuned (narrowband) versions exist, and operating frequencies range from 300 MHz to 50 GHz. The voltage gain of the tube can be of the order of 40 decibels.


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CPI / BMD Products Including Receiver Protectors, Switches, Pressure Windows, Magnetrons, Traveling Wave Tubes, Crossed ... (1499 words)
In normal operation, an rf signal introduced at the cathode end of the helix travels along the circumference of the helix at approximately the velocity of light, although the velocity in the direction of the beam is reduced by the pitch-to-circumference ratio of the helix.
Modulation in the Ring Loop TWT is accomplished by applying the carrier signal to the rf input element and applying the intelligence to the control anode.
By this, the TWT is made to either amplify or phase or pulse modulate the rf carrier signal, depending on the applied signal and the TWT parameters.
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