Feature: 1. Automatic Sending and Receiving Switching: RF trigger switching of high-speed detection mode, which is realized by the interrupt mode, so the response speed is very short. With this automatic triggering, you don\u0027t need to connect the PTT control line to automatically switch the amplifier into transmit mode by the signal you input. 2. Automatic Switching of LPF Filters: A frequency detection module designed on the circuit, so that it can automatically switch to the corresponding LPF filter according to the frequency of the radio frequency signal input to the power amplifier by your radio station. 3. CW Semi-insertion Mode: The amplifier has an adjustable semi-insert mode function even if the station does not have a CW semi-insert mode. The semi-insert delay time can be toggled by double-clicking the multi-function button, and with the delay ranges of 100ms-3s. 4. Real-time Display of Power and Standing Waves: A dynamic bar is added to it, so that the output power can be better observed. When the standing waves exceeds 2.0 or the power exceeds 55W, the power amplifier will be automatically turned off, the display screen will flash correspondingly to display the value that triggers the protections, and the buzzer will alarm. 5. Frequency Display Function: Displays the current transmitting frequency in real time with an accuracy of 100KHz. 6. Multiple protections design, power and standing waves display and protections; voltage display and protections. 7. Multifunctional design, temperature detection, display and temperature protections, and with intelligent cooling function; Voltage real-time display and high and low voltage protections function. Specification: This 50W intelligent portable shortwave power amplifier with high-speed automatic sending and receiving switching function, with high-speed LPF Filters automatic switching function. Power and standing waves display and protections, voltage display and protections, temperature display and intelligent cooling, CW semi-insert mode function. Features: Automatic Sending and Receiving Switching: RF trigger switching of high-speed detection mode, which is realized by the interrupt mode, so the response speed is very short. With this automatic triggering, you don't need to connect the PTT control line to automatically switch the amplifier into transmit mode by the signal you input. Automatic Switching of LPF Filters: A frequency detection module designed on the circuit, so that it can automatically switch to the corresponding LPF filter according to the frequency of the radio frequency signal input to the power amplifier by your radio station. CW Semi-insertion Mode: The amplifier has an adjustable semi-insert mode function even if the station does not have a CW semi-insert mode. The semi-insert delay time can be toggled by double-clicking the multi-function button, and with the delay ranges of 100ms-3s. Real-time Display of Power and Standing Waves: A dynamic bar is added to it, so that the output power can be better observed. When the standing waves exceeds 2.0 or the power exceeds 55W, the power amplifier will be automatically turned off, the display screen will flash correspondingly to display the value that triggers the protections, and the buzzer will alarm. Frequency Display Function: Displays the current transmitting frequency in real time with an accuracy of 100KHz. Multiple protections design, power and standing waves display and protections; voltage display and protections. Multifunctional design, temperature detection, display and temperature protections, and with intelligent cooling function; Voltage real-time display and high and low voltage protections function. Specifications: Name: Power Amplifier Material: printed circuit board Frequency ranges: 3.5MHz-28.5MHz Input power: 2-5W Input standing waves: ≤2.0@50Ω Maximum output power: 40-50W Output impedance: 50Ω Voltage: 8.5V-14.2V; 13.8V (typ.) Current consumption: ≤12A Maximum working temperature: ≤55℃ Item size: 89 * 38 * 160mm / 3.50 * 1.50 * 6.30in Item weight: 615g / 1.36lb Package size: 160 * 100 * 50mm / 6.30 * 3.94 * 1.97in Package weight: 709g / 1.56lb Packing List: 1 * Power Amplifier Package List: 1 * Power Amplifier