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LDMOS Amplifier for 630 meters

Input matching 3

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June 28, 2019

It took many hours and many iterations, but I think I finally got an impedance matching network that will work for the 300 watt LDMOS amp.

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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

Input matching 3

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Schematic

A few changes

Negative feedback installed