Sam, I think others have found that without changing ferrite materials, output above 17m is pretty poor, if it works at all. If you look up some threads about 10m builds of this amp, the changes are discussed and laid out.?
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To answer your question, there would not be significant sacrifice. Some rigs are set up this way, where the highest LPF is always in line. I've had considerations of doing the same, making a 40-15m amp.? Currently though, I have a 50w amp built for 20m, that I have run on 40m with an external 40m LPF added in line. Output on both is as expected.?
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One LPF board to look at/consider:
The 3 band LPF version is only 5cm x 5cm! Problem is that I'm not sure that a 5 pole LPF would be enough with this Class C amp, especially if covering more than one band with that LPF.
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-Nate?
N8BTR
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