50W Power Amplifier for 70 MHz

By SP2DMB

This document details the design and construction of the PA70H, a 50-watt RF amplifier for the 70MHz (4-meter) amateur radio band. Built around the Mitsubishi RD70HVF1 MOSFET transistor, the amplifier delivers 45-55W output with 3-5W input power while operating on 13.8V DC at approximately 7-8A. The PCB design incorporates multiple protection circuits including overcurrent, SWR, and temperature control. The amplifier features various control modes including GND PTT, +13.8V PTT, and RF VOX. Two versions are available: PA70HLI (requiring 100mW input with additional driver) and PA70H (for 3-5W input). The comprehensive documentation includes circuit diagrams, assembly instructions, and performance data showing successful operation from both 100mW and 3.5W input sources.

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Technical Reference/Amplifiers/VHF Amplifiers

The title of the main category is VHF Amplifiers and it deals mainly with VHF linear amplifiers. The link to this resource has been on our site since Wednesday Apr 2 2014, and it has been followed 1110 times. So far it received 2 votes for a total score of 7.00/10
Last updated: 2025-04-11

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