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I have four QDX's and I've decided to add a 1N4148 across L14 as many other have done here to add some protection against accidental high SWR.??

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It should not matter. The reverse voltage is less than either value, and the forward current is very short in duration. The 1n4148 is the best choice because of the junction's switching speed. I would go with the least expensive, most available device.

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73

Evan

AC9TU