8/24/2023 0 Comments Coutch tuner z nation![]() Using this switching arrangement, I can select between one section of the capacitor, both sections in parallel, or both sections in parallel with a fixed 470pF mica capacitor. How convenient!Īnother W6JJZ modification I used was the inclusion of a DPDT (center off) toggle switch to provide some flexibility with the input capacitor. Another reason for choosing the T-200-6 core was that I happened to have one in my junk box. Here again, I went with W6JJZ’s suggested turns count. The number of turns has to be adjusted for the Type-6 core, due to differences in permeability. W6JJZ recommends the Type-6 core over the Type-2 because it provides a higher Q over most of the HF range. First, instead of the T-200-2 toroid specified in the SPRAT article, I used a T-200-6 core. I incorporated a few modifications in my version, based on an article by W6JJZ (“The Z-Match: An Update”, QRP Quarterly, July 1995, pp 10-11). This design, by the way, is similar to the one used in the Emtech ZM-2. I based it on a classic design which was first appeared in SPRAT #84 (see the G3YCC web site for a schematic of the original design). ![]() I make no claims of originality for anything in my version of the Z-match. ![]()
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