Ham Radio General Class Practice Test

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What minimum frequency separation should you allow to minimize interference to stations on adjacent frequencies when selecting a CW transmitting frequency?

5 to 50 Hz
150 to 500 Hz
1 to 3 kHz
3 to 6 kHz

The correct answer is: 150 to 500 Hz

To minimize interference to stations on adjacent frequencies when selecting a Continuous Wave (CW) transmitting frequency, allowing a frequency separation of 150 to 500 Hz is essential. This range provides a sufficient buffer to ensure that your signal does not unintentionally overlap or interfere with nearby transmissions. CW signals are narrowband, and frequencies close to one another can cause signals to bleed over into adjacent channels, making it difficult for operators on those frequencies to communicate effectively. Interference can lead to poor reception and increased noise levels for others, so it is important to allow this minimum distance. Frequencies less than 150 Hz might not sufficiently protect adjacent operators from interference, while greater separations, such as those in the kilohertz range, could restrict the use of available frequencies unnecessarily and reduce overall efficiency in band utilization. This practice is not only a matter of technical necessity but also promotes good operating etiquette among amateur radio operators.