Which of the following is true of PL-259 type coax connectors?

The PL-259 type coax connectors are commonly used at HF (High Frequency) and VHF (Very High Frequency) frequencies, making this option correct. Their design allows for efficient transmission of signals at these frequency ranges, which is why they are a popular choice among amateur radio operators and in various RF applications. The PL-259 is designed to maintain good RF characteristics, including low loss, which is essential for effective communication in these bands.

In the amateur radio community, the robustness and ease of use of the PL-259 connector make it particularly suited for connections to antennas and equipment operating within HF and VHF bands. This connector’s ability to handle the power levels typically used in these ranges further contributes to its widespread adoption.

The other alternatives do not accurately describe the characteristics of PL-259 connectors. For example, they are not typically preferred for microwave operation, as other connector types, such as N connectors or SMA connectors, are more suitable for those higher frequencies. While they can be made to be somewhat resistant to water, they do not inherently guarantee watertight performance, which is often dependent on installation and environmental factors. Additionally, PL-259 connectors are not bayonet-type connectors; instead, they use a screw-on mechanism for a secure connection