Ham Radio General Class Practice Test

Which of these connector types is commonly used for RF service at frequencies up to 150 MHz?

1. Octal

2. RJ-11

3. PL-259

4. DB-25

The correct answer is: PL-259

The PL-259 connector is commonly used for RF service at frequencies up to 150 MHz due to its design, which provides a secure and low-loss connection for coaxial cables in radio frequency applications. This connector is well-suited for amateur radio setups, particularly for HF (high frequency) and VHF (very high frequency) bands. Its durability and ability to handle the impedance necessary for RF signals make it a preferred choice among amateur radio operators for applications in that frequency range. In contrast, the other connector types mentioned are not typically associated with RF applications at these frequencies. The octal connector is generally used in applications like vacuum tubes and other electronic devices that do not operate within the RF spectrum. RJ-11 connectors are primarily used for telephone line connections and have limitations in terms of frequency and performance in RF applications. DB-25 connectors are more commonly utilized for computer and data cables, making them unsuitable for RF communication purposes. Thus, the PL-259 stands out as the most appropriate choice for RF service at frequencies up to 150 MHz.