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1. [Amps] Shorted turns reduce harmonics? (score: 1): Author: "Mark Marsden" <mm@plextek.co.uk>; Date: Fri, 22 Jul 2005 10:41:31 +0100; Hi Amp'ers The harmonics from my homebrew amplifier, on some bands, are much lower than expected, and I've been wondering why. The output Pi tank coil is made up of 3 orthogonal coils for 10-12m, 15-; /archives//html/Amps/2005-07/msg00250.html (7,801 bytes)
2. Re: [Amps] Shorted turns reduce harmonics? (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Fri, 22 Jul 2005 15:35:24 +0100; It might be interesting to measure the actual impedance presented by the coil/switch assembly at the harmonic frequencies. Maybe it's not behaving like a simple inductor. Steve _____________________; /archives//html/Amps/2005-07/msg00258.html (6,815 bytes)
3. Re: [Amps] Shorted turns reduce harmonics? (score: 1): Author: "Mark Marsden" <mm@plextek.co.uk>; Date: Fri, 22 Jul 2005 16:06:24 +0100; Steve Thanks for that. You're quite right it's not acting like a pure inductor. I think the inter-winding capacitance of the shorted turns, of parts of the 15-80m coil and the 160m coil, with a short; /archives//html/Amps/2005-07/msg00259.html (7,554 bytes)
4. Re: [Amps] Shorted turns reduce harmonics? (score: 1): Author: "Mark Marsden" <mm@plextek.co.uk>; Date: Mon, 25 Jul 2005 09:47:53 +0100; HI Amp'ers I measured the response of pi-tank with a VNA this weekend. Thanks to Steve G8GSQ, Jos ON4KJ & Hank WV7U for the advice. There is a parasitic notch that is tuneable by the load control, wh; /archives//html/Amps/2005-07/msg00306.html (7,303 bytes)

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