PA50WU VHF 70 cm

The PA50WU 50W VHF power amplifier (hereinafter referred to as the "Amplifier") for the 70CM band is designed for linear amplification of high-frequency signals. Externally, the amplifier consists of a SunSDR2 PRO transceiver housing and a heatsink with a cooler from the SunSDR2 DX transceiver. This amplifier will be of interest to long-distance radio enthusiasts on the 2-meter amateur radio band. One possible use for this amplifier is installation in a vehicle in conjunction with the SunSDR2 PRO transceiver.

To achieve 50W of UHF output power, a Mitsubishi RA60H3847M1A-501 amplifier assembly is used. Thanks to the use of active broadband elements in the amplifier, it requires no tuning or adjustment across the entire operating frequency range. Active cooling allows the amplifier to operate continuously for extended periods at full output power. The amplifier is designed using a classic single-ended circuit and operates in all modulation modes.

The amplifier features an extensive protection circuit—it automatically shuts down if the heatsink temperature, drain voltage, or SWR exceed acceptable limits. The amplifier is protected against supply voltage reversal and offers overall high reliability.