What is the main purpose of connecting a suitable key-click filter in a radiotelegraph transmitter?

What is the main purpose of connecting a suitable key-click filter in a radiotelegraph transmitter?

• A. To increase transmission power
• B. To reduce sparking at the contacts
• C. To stabilize the frequency
• D. To enhance signal clarity

Answer: (B)

The main purpose of connecting a suitable key-click filter in a radiotelegraph transmitter is to reduce sparking at the contacts. When a key is pressed or released in a keying system, it generates abrupt changes in current, leading to spikes and transients which can create unwanted emissions called "key clicks." These clicks manifest as unwanted noise that can interfere with nearby communications and degrade the overall quality of the transmitted signal. By using a key-click filter, these abrupt changes are smoothed out, minimizing sparking at the contacts and effectively reducing the key clicks produced during operation. This not only helps in cleaning up the transmitted signal but also contributes to maintaining the integrity of communication by preventing interference with other users on the same band.

The main purpose of connecting a suitable key-click filter in a radiotelegraph transmitter is to reduce sparking at the contacts. When a key is pressed or released in a keying system, it generates abrupt changes in current, leading to spikes and transients which can create unwanted emissions called "key clicks." These clicks manifest as unwanted noise that can interfere with nearby communications and degrade the overall quality of the transmitted signal. By using a key-click filter, these abrupt changes are smoothed out, minimizing sparking at the contacts and effectively reducing the key clicks produced during operation. This not only helps in cleaning up the transmitted signal but also contributes to maintaining the integrity of communication by preventing interference with other users on the same band.