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I have built this homebrew Dummy Load with two 100Ω resistors in parallel to make it a 50Ω load. The resistors are of a special zero inductance type from Florida RF Labs made for high frequencies. The Dummy Load handles 80W continuously or 200W instantaneously up to atleast 1.3 GHz.
The resistors are mounted on heatsinks with the thermal resistance 0.8 K/W