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

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

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Microwave Communication
The Gunn diode oscillator

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

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