Beat Frequency Oscillator

Beat Frequency Oscillator(BFO): In this Beat Frequency Oscillator, the outputs of two RF oscillators are applied to a square law detector and the resulting difference frequency is amplified. The main advantage of this type of oscillator is that a stable continuous output covering the entire AF range can be realised by simple variation of the […]


Vectroscope: Vectroscope – This test instrument combines a keyed colour bar generator with an oscilloscope and is used for alignment and testing the colour section of a TV receiver. The amplitude and phase of the chrominance signal represents the colour saturation and hue of the scene. This information can also be displayed on the oscilloscope […]

Color Bar Generator

Color Bar Generator: Color Bar Generator – The composite video signal at the output of a video detector consists of luminance Y signals, the chrominance signal, the color burst, sync pulses and blanking pulses. The amplitude of the video signal varies continuously due to the changing picture content, such a waveform is not useful for […]

Video Test Pattern Generator

Video Test Pattern Generator: Video Test Pattern Generator – A pattern generator provides video signals directly, and with RF modulation, on standard TV channels for alignment, testing and servicing of TV receivers. The output signal is designed to produce simple geometric patterns like vertical and horizontal bars, checkerboard, cross-hatch, dots, etc. These patterns are used […]

Marker Generator

Marker Generator: Marker Generator – The sweep generator provides a visual display of the characteristics of the circuit or amplifier, but this is inadequate because it does not give any precise information of the frequency on the traced curve. For this, a separate RF generator, known as the Marker generator is used. This generator though […]

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