To: | amps@contesting.com |
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Subject: | Re: [Amps] Discrepencies in Pi-net calculators |
From: | Larry Benko <xxw0qe@comcast.net> |
Date: | Tue, 19 Nov 2013 22:31:50 -0700 |
List-post: | <amps@contesting.com">mailto:amps@contesting.com> |
Steve,According to my calculations all 3 networks match 50 ohms to 135 ohms @ 28.03MHz. However Group 1 has a Q of 1.9, Group 2 has Q of 4.7, and Group 3 has Q of 2.7 according to my understanding of nodal Q. 73, Larry, W0QE On 11/19/2013 7:24 PM, Steve Flood wrote: I've been working through some Pi-network design for an input tuning network recently and have tried out several online calculators as well as traditional formulas and common software. Using the same input variables for each tool, I generated three very different results.For Rin = 50 ohms, Rout = 135 ohms, f=28.03 MHz, Q=2.7Group 1: Tonne's PI-EL software, ARRL Handbook formulas, and Jim Hawkins online Java Radio Calculator. Cin = 93pF, L=457nH, Cout=79pFGroup 2: VK1OD online calculator, electronicdesign.com calculator, and raltron.com calculator. Cin = 307pF, L=251nH, Cout=194pFGroup 3: EEweb.com calculator, VK2ZAY online calculator, and Impedance Matching Network Designer online calculator (sandiego.edu). Cin=163pF, L=383nH, Cout=113pFSo then, you can see my dilemma here. Why are these so different? And why the common groupings?Steve, KK7UV _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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