50W HF power amplifier is a powerful tool in ! It boasts small size, high communication efficiency and high power. Built-in automatic cooling fan automatically stop rotating during standby to reduce wind noise. It also enables TX/RX automatic switching. When there is a signal input, it automatically switch the transmission mode, without the need for a dedicated control line for your radio. Input power: 1-5W Output power: 40-60W Working frequency: 3-21Mhz Working voltage: 12V-13.8V Note:Before use, you need to use a or similar tools to measure the antenna to 50Ω. The standing wave should be less than 1.5, otherwise the power amplifier tube be burned due to the mismatch of the output! Note: due to different production batches, the words on the products may be different, which not affect the use. Colour:Black Material:aluminum alloy Package Contents: 1 * OGS-50W HF Power Amplifier 1 * Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.