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LDMOS Amplifier for 630 meters

Arrival

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June 19, 2019

They arrived! A pair of 300 watt LDMOS mosfet amplifier chips. These are for the next 300 watt VLF amplifier build.

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Schematic

September 10, 2019

Here's the schematic. It took 10 revisions to get everything working to my satisfaction.

Made a little more progress on the LDMOS amplifier. I added 4200pf of capacitance to one part of the output circuit and picked up some output power. Now I'm getting 150 watts out at max power. Half way there

Negative feedback installed

July 16, 2019

Getting closer to putting RF to the beast... I have the negative feedback circuit installed. A few more connections, then test it with a 48 volt power supply, then do some voltage and bias measurements.

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LDMOS Amplifier for 630 meters

Arrival

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Schematic

A few changes

Negative feedback installed