A 600W broadband HF/6m amplifier using affordable LDMOS devices - 2x MRF300 @ 48V 

600W HF/6m linear amplifier using rugged MRF300 transistors - NXP Homebrew RF Design Challenge entry.
Home page for the project: qrpblog.com/a600-hf-6m-600w-l...
A few performance figures for the A600:
- coverage from 1.8MHz to 54MHz and more
- P1dB output power between 580W and 750W depending on band
- over 20dB large signal gain, flatness around 1dB
- high efficiency (min 57%, max 73% at P1dB depending on band)
- stable clean bias with thermal tracking
- power supply: 48V, 18A typical, 20A max
- advanced thermal design using a liquid metal alloy and copper heat spreader
- multiple onboard sensors accesibile via the diagnostic header provide measurements for PA supply voltage, PA instantaneous current draw, heatsink temperature, output power and output mismatch
- bias voltage can be disabled via a control line, to save power when not transmitting
- onboard connectors for separate low pass filter bank
- compact size 190x100x80mm (including heatsink but excluding fans)
PCBs were manufactured by PCBway. Have a look, as they offer excellent service: www.pcbway.com/

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