The error voltage from the discriminator is applied to the:

Repeller (reflector) of the klystron

In a klystron, the repeller or reflector is an essential component that helps control the electron beam and its interaction with the RF signal. The klystron is a microwave tube used in various applications, such as amplification and generation of microwave signals.

When an error voltage is applied to the repeller of the klystron, it alters the electric field strength inside the tube, which, in turn, affects the electron beam's velocity. This modulation of the electron beam's velocity helps in controlling and adjusting the output signal, ensuring stable and reliable operation of the klystron as an amplifier or oscillator.

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In a RADAR unit, the local oscillator is a:

Klystron.

In a RADAR unit, the local oscillator is typically a "Klystron." A klystron is a type of vacuum tube used as a microwave amplifier or oscillator. It generates a stable microwave signal that is then mixed with the received radar signal to convert it to an intermediate frequency (IF) for further processing and detection.

Mnemonic: "Keep Laughing, You've Seen The Radar On!"

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