ARRL Technician Practice Exam

Which frequency band is primarily used for weak-signal communications on long-distance VHF contacts?

1. 2 meters

2. 70 centimeters

3. 1.25 meters

4. 5 meters

The correct answer is: 2 meters

The 2-meter band is primarily used for weak-signal communications on long-distance VHF contacts because it provides a good balance of propagation characteristics and accessibility for amateur radio operators. This band, which ranges from 144 to 148 MHz in the United States, allows for various modes of transmission including single sideband (SSB) and digital modes, which are effective for weak-signal communication. One of the key reasons the 2-meter band is favored for weak-signal work is its ability to support both line-of-sight and sporadic E propagation, which can enable contacts over long distances under the right conditions. Additionally, many VHF operators find that the 2-meter band is more commonly used, leading to better chances of making contacts than on less popular bands. In contrast, the other frequency bands mentioned—70 centimeters, 1.25 meters, and 5 meters—are used less frequently for long-distance weak-signal communications. While they can certainly support weak-signal modes, they do not have the same level of activity or the same propagation abilities for long distances as the 2-meter band does.