3. It is used to test the signal-to-noise ratio of shortwave radio signals in the frequency range 3-30MHz. The input power does not exceed 100W, and the smallest LED ( 1.0 corresponds to green light) requires 5W power. It is suitable for various shortwave radio equipment. 2. It can be used to measure radio frequency signals. It uses 5 LEDs to the strength of the signal and LEDs of different colors to different SWR ranges. 1. Small and , powered by tap power supply, , easy to carry, very suitable for amateur radio enthusiasts to use in . 4. This equipment is usually used in radio communication systems such as radio broadcasting, television broadcasting, and radio communications. 5. It helps the operator determine the strength of the signal and thereby adjust the settings of the radio equipment to improve the quality and reliability of the signal., Weight: 0.2314853751 pounds, Manufacturer: Tuidzljd