Using a block diagram, Explain how a continuous wave telegraph transmitter can be used.

Block Diagram of a Continuous Wave Telegraph Transmitter:

1. Input Key (Telegrapher Key): Controls the transmission of the signal. When pressed, it enables the transmission; when released, it stops the transmission.

2. Keying Circuit: Converts the mechanical keying input into electrical signals. It switches the modulator between the "on" and "off" states.

3. Modulator: Superimposes the keying signal onto a continuous wave (CW) carrier signal. This modulation creates sidebands around the carrier that represent the keying information.

4. Power Amplifier: Amplifies the modulated signal to increase its power for transmission.

5. Antenna: Radiates the modulated signal into the air.

Operation:

- When the key is pressed, the keying circuit activates the modulator, which superimposes the keying information onto the carrier signal.
- The modulated signal is then amplified by the power amplifier and transmitted through the antenna.
- The receiver at the receiving end picks up the transmitted signal and demodulates it to extract the keying information.
- This process allows for transmission of Morse code messages (dots and dashes) over the airwaves.