Ham Radio General Class Practice Test

Which of the following is most commonly used for SSB voice communications in the VHF and UHF bands?

1. Upper sideband

2. Lower sideband

3. Vestigial sideband

4. Double sideband

The correct answer is: Upper sideband

The most commonly used method for SSB (Single Sideband) voice communications in the VHF and UHF bands is upper sideband. This preference arises mainly from historical and practical considerations. Upper sideband transmissions provide better clarity and efficiency in communication, especially over the higher frequencies like VHF and UHF, where they are predominantly used. In upper sideband, the carrier frequency is suppressed, and information is transmitted on the frequency above the carrier. This results in reduced bandwidth usage and allows for more efficient use of the available spectrum, which is essential in bands that are crowded with various communication methods. The use of upper sideband also helps to minimize interference with adjacent channels, improving the overall quality of communication. This technique is favored over lower sideband in VHF and UHF operations mainly due to convention and compatibility with the designs of most modern transceivers, which are optimized for upper sideband operation. While lower sideband might be used in certain situations, it is not the standard choice for voice communications in these bands.