ARRL Technician Practice Exam

Which statement is true regarding PL-259 type coax connectors?

1. They are used exclusively for VHF

2. They are commonly used at HF frequencies

3. They work best at low frequencies only

4. They are not weather resistant

The correct answer is: They are commonly used at HF frequencies

The statement that PL-259 type coax connectors are commonly used at HF frequencies is accurate because these connectors are specifically designed to accommodate the demands of high-frequency radio communication. The PL-259 connector features a robust design that includes a threaded coupling mechanism for a secure connection, which is essential for maintaining signal integrity at HF frequencies that range from 3 to 30 MHz. These connectors are widely utilized in amateur radio and other applications that operate within HF bands due to their ability to handle higher power levels and their effectiveness in minimizing signal loss. While they can also be used for VHF applications, their primary reputation is established in the HF realm where they perform optimally in both transmit and receive scenarios. On the other hand, the other statements present incorrect contexts about the PL-259 connectors. They are not exclusively used for VHF, as mentioned, indicating their versatility across HF applications; they are also designed for performance at a variety of frequencies beyond just low frequencies, and while connectors can have varying degrees of weather resistance, the PL-259 itself, when properly installed and maintained, can be weather-resistant. This robustness makes them a preferred choice for outdoor and mobile installations in amateur radio setups.