What type of test signal is used in modern sweep systems to avoid interference with channels?

The use of narrow-band continuous wave (CW) test carriers in modern sweep systems is significant because they are specifically designed to limit the frequency range of the signal, thereby helping to minimize interference with adjacent channels. This characteristic allows for precise measurement and testing without disrupting the operation of nearby frequency bands.

In contrast, broadband pulsed signals encompass a wide frequency range and can potentially overlap with other channels, leading to a higher likelihood of interference. High-frequency intermittent waveforms might also create confusion in channel separation due to their transient nature. Meanwhile, analog modulation signals can introduce various complexities in frequency response that may not always allow for clean differentiation between tests and operational channels.

Thus, narrow-band continuous wave test carriers serve the crucial role of providing a clear and isolated test signal, ensuring effective operation in systems where channel integrity is essential.