Microwave Communication
It is possible to increase the maximum range of a radar equipment by

All of these
Raising the peak power of the transmitter
Narrowing the beam width and increasing the pulse duration
Lowering the pulse frequency

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Microwave Communication
The Gunn diode oscillator

Is capable of generating continuous microwave power of the order of kilowatt
Operates over a positive resistance characteristic
Generates frequencies which are below 100 MHz
Depends on the formation of charge domain

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