Features: 1. Commonly used in SSB, AM linear power amplifier, CW, FM, power amplifier, and the most basic signal amplification. 2. Easy to install and operate. 3. Low noise, high cost performance, very suitable for DIY enthusiasts. 4. The overall gain exceeds 40db, which is 10,000 times. Input 10W will output 1mW, and input 45W will output 5mW. 5. Our products are shipped as parts, not including radiators, please assemble them yourself. Specification: Input power: 1-5mW Output power: 45W (maximum) Input voltage: DC 13.8V 10A or higher Maximum output power: 57W (without heat sink) Output impedance: 50 ohms, adjustable between 10-200 ohms as needed Input frequency range: 3M-30MHz (HF channel) Input / output interface: standard SMA interface, external threaded hole Frequency input range output power: 3.500MHz----54W 7.050MHz----56W 10.000MHz----57W 14.270MHz----55W 21.400MHz----41W 24.000MHz----37W 28.100MHz----25W 29.600MHz----20W Weight: approx. 62g Package list: 1 * Power Amplifier DIY Kit