Re: Toroid material for QRP HF tuner: "2" or "6"?


Thanks for the pointers.  That Lofgren writeup includes these comments:

"I recommend a T-130-6 core, which gives better Q throughout the HF range than is attainable with a T-130-2 core. But either one is satisfactory. The important point is that the cores differ in permeability, so the number of turns will differ depending on which one is selected."

He also explains how to alter the inductance of the coil to fit the range of capacitance you happen to have on hand. And his way of tapping the coil (with ground in the middle instead of an end) supposedly offers somewhat better balance - for balanced loads.

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