Has anyone done mods to use the 5Watt PA on the lower VHF bands 6 and 2meters? The assembly instructions hint that is may work on those bands. The suggestion of substituting the IR510 for the RD15HVF1

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I wish to make an amplifier for WSPR on 8m (40 MHz). RD15HVF1s are likely to outperform IRF510s in the 5, 10, and 50W QRP-Labs amplifiers. These cost $20 each at RF Parts, and Amazon no longer offers

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Hi. I'm about to build the 5W HF PA to go with my U3S transmitter. I hope to be able to fit it behind everything else. I have the U3S board, a LPF relay board and a GPS board. Everything will be tucke

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Dear all, On most class C and D amplifiers the IRF510 is followed by a trifilar or bifilar transformer toroid. Can someone please explain what the function of the this type of transformer is. (is it f

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