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Same as my MFJ load. nThere is a derating curve on the end of it. At 400 watts it says no longer than 40 seconds keydown time but not sure the cool off time......likely several minutes once it gets hot. getting them too hot can change the resistance even before the load burns up.

[QUOTE="Captain Kilowatt, post: 594755, member: 39"] Same as my MFJ load. nThere is a derating curve on the end of it. At 400 watts it says no longer than 40 seconds keydown time but not sure the cool off time......likely several minutes once it gets hot. getting them too hot can change the resistance even before the load burns up. [/QUOTE]

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