Design of Power Amplifier and Filter Circuits on Voice Radio Communication for Very High Frequency Spectrum

One of the solutions in overcoming the use of communication frequency that is not suitable for radio communication, especially in maritime communication is to design communication devices that are in line with the spectrum regulated by the regulator, where one of the frequencies in regulations is in the VHF spectrum. To maximize the range of the radio communication device, a Power Amplifier system is designed that can maximize the transmit power of the radio from its basic 1-watt value. Power Amplifier system will be designed on a voice communication radio with the amount of output power reaching a value of 20 watts by utilizing the RD15HVF1 (MOSFET). The Power Amplifier system consists of 3 main circuits, namely the switching circuit, the power amplifier circuit along with impedance matching, and another one is the low pass filter circuit.