With the aid of a block diagram, describe the continuous wave telegraphy transmitter.

Continuous Wave Telegraphy Transmitter

Block Diagram:

[Image of a continuous wave telegraphy transmitter block diagram]

Description:

The continuous wave telegraphy transmitter converts an input code into a continuous radio frequency (RF) signal that carries the encoded information.

Key Components:

- Input Code Source: Provides the input message to be encoded, typically in Morse code.
- Audio Frequency Tone Generator: Converts the input code into an audio frequency tone corresponding to the Morse code dots and dashes.
- Audio Amplifier: Amplifies the audio frequency tone to a sufficient level for transmission.
- RF Oscillator: Generates a continuous RF carrier wave.
- Modulator: Modulates the amplitude, frequency, or phase of the RF carrier wave with the amplified audio frequency tone.
- Antenna: Transmits the modulated RF signal to the receiver.

Operation:

1. The input code is converted into an audio frequency tone.
2. The audio frequency tone is amplified and used to modulate the RF carrier wave.
3. The modulated RF signal is transmitted through the antenna.
4. The modulated RF signal carries the encoded information in the form of variations in amplitude, frequency, or phase.

Advantages:

- Energy-efficient due to continuous transmission.
- Can operate over long distances with high signal-to-noise ratios.
- Relatively simple to build and operate.

Applications:

- Communication over long distances in the early days of radio technology.
- Used in amateur radio and military communications for Morse code transmission.