>>Larry wrote:
>>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.
I used the same variable values for each tool, including a specified Q. I
was hoping to generate some discussion in the group as to how the results
fall into three distinct groupings, rather than asking for help in designing
a specific network.
I've added a few more tools to the groupings:
Group 1
Tonne's PI-EL software
ARRL Handbook formulas
Jim Hawkins online Java Radio Calculator
G3SEK spreadsheet
Leonard Anderson's article ""Pi Network Design" in the March, 1978 issue of
Ham Radio.
(BTW, I found a print error in one of the formulas in that article).
Group 2
EIMAC "Care and Feeding..." p. 52-55
VK1OD online calculator (derived from EIMAC)
Bill Orr 23rd Radio Handbook p14-18
electronicdesign.com calculator
raltron.com calculator.
Group 3
EEweb.com calculator
VK2ZAY online calculator
Impedance Matching Network Designer online calculator (sandiego.edu).
Steve, KK7UV
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