High-speed automatic switching of LPF filters, automatically switching between the corresponding LPFs without connecting the ACC control line. Four sets of fifth-order LPFs cover the entire HAM-specific shortwave communication band, from 80 meters to 10 meters. Power and standing wave display and protection reliable operation even in poor antenna conditions, preventing damage. A wide voltage range, voltage display, and protection functions make outdoor use with lithium batteries more convenient. Temperature display, temperature protection, and intelligent fan cooling. Semi-plugged mode allows for semi-plugged operation even without a PTT send connection. Supports , , and frequency band switching protocols (requires an ACC control cable, not included). LPF filter combination with reduced harmonics. Improved gain consistency, eliminating the need for frequent radio power adjustments. Near-perfect thermal runaway management, ensuring stable operation even at operating temperatures as high as 70°C. More comprehensive thermal runaway management reduces intermodulation distortion and further improves linearity. power supply for the OLED display, further reducing interference from the OLED screen's charge pump on the ADC. Frequency Range: 3.5MHz - 30MHz Input Power: 1 - 5W (7W maximum) Output Power: 50W ±1.5dB 13.8V Output Impedance: 50Ω Supply Voltage: 10V - 17.5V; 13.8V (typical) (Note: The lower the voltage, the lower the output power) Current Consumption: ≤10A Operating Temperature: ≤55°C Color: Black Material: Aluminum Alloy Package Contents: 1 set x Shortwave Power Amplifier 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.