Charactersitics of Gunn diode

Initial adjustments :

· Pin bias is kept at maximum

· Gunn bias is between 6 and 7

· Adjust the starting screw gauge for square wave output at the detector

· Have minimum attenuation

· Vary slotted line plunger to obtain maximum amplitude for square wave.

· Keep beam voltage to be between 270 and 300.

· Keep repeller voltage to be maximum and then reduce it to get perfect square wave

· Adjust the amplitude and frequency to get maximum amplitude of square wave

· Keep the probe end at the detector and do these adjustments

· Make initial adjustments.

· Provide maximum attenuation.

· Vary the Gunn bias in steps of 0.5 and note down the current.

· Change the V-C knob correspondingly to note down the voltage and current