In transmitter radio usability is sending High. It is must use good power supply circuit. This is linear voltage regulator 13.8V at 40amp Circuit. It is gives high current source and the circuit is the character linear voltage regulator. Then have no the noise is simple and there is the durability very much. But be defective be large-sized there is tall heat work. It use the integrated circuit LM723 voltage regulator ic control fixed voltage be stable at 13.8V and have ,the transistor 2N3055 amounts 6 pcs. help to enlarge current tallly arrive at 40A get. If you take an interest as a result , see the detail adds done to a turn Link