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500 kHz Projects - Amplifiers

Click to enlarge0,5 kilowatts 500kc (630m) MOSFET PA by DJØABR
It is hard to radiate a sufficiant amount of power on the 630m band since the efficiency of usual antennas is very poor (< 1%). Therefore we need to generate a lot of power. This document describes an amplifier using four MOSFETs with an efficiency of > 90%.

Click to enlarge100W MF CW PA by GW3UEP

Click to enlarge25W 472 kHz CW PA by GW3UEP

Click to enlargeA 500 Watt Output 4-400A Linear Amplifier for 600 Meters by W5JGV
With 3200 Volts on the anode, the amplifier draws 268 MA key down, CW mode. Screen voltage is 600, and the anode idle current is 80 MA. Idle dissipation is 256 watts. DC Input power is 915 watts, and the RF output power to the dummy load is 540 watts, for a calculated efficiency of 59% with good linearity.

Creation date : 12/02/2010 @ 22:55
Last update : 08/08/2018 @ 09:01
Category : 500 kHz Projects
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