Which basic requirement does a transmitter need for effective communication?

For effective communication, a transmitter must radiate RF energy at specific frequencies. This capability allows the transmitter to send signals that can be effectively picked up by the intended receiver, which is usually tuned to the same frequency. By ensuring that the signal is transmitted at a specific frequency, the communication can be precise and clear, minimizing the chances of interference from other signals.

When a transmitter operates on designated frequencies, it ensures that the information being conveyed is sent and received efficiently. This aligns with the principles of radio communication, where different stations or devices communicate on set frequencies to avoid overlap and maintain clarity in transmission.

In contrast, simply transmitting at high power does not guarantee effective communication, as it could lead to interference with other signals. Suppressing all other frequencies would not be practical in most communication scenarios, as it could limit the ability to communicate with different devices operating at various frequencies. Frequently changing frequencies could lead to confusion and synchronization issues, making it harder for receivers to consistently pick up the correct signal. Thus, the necessity for a transmitter to radiate RF energy at specific frequencies remains paramount for effective and reliable communication.