RadioBanter - View Single Post

February 2nd 04, 08:32 PM

On 2 Feb 2004 10:04:45 -0800, (Art Young)
wrote:

|I have not seen any equations for a Pi network where you can enter the
|full complex number which would include the series resistance .

The series resistance of what?

|
|I know someone must have done it but it isn't in any of the
|ref-material
|
|I have run across.
|
|I did work out an equation some years back using APL2 which handles
|complex
|
|numbers or complex arrays. I solved the network looking into both ends
|getting two equations.
|rearrange both solving for the tuning cap. Then set up both equations
|making
|
|one equal the other. Then arrange all those terms (about 15 on each
|side)
|
|and solve for the loading cap. This will be a a quadratic equation.
|
|Use the quadratic root (-B +/- squareroot (B*2 -4xAxC)) /2xA.
|
|Now plug the values into the computer for load , inductor and Zin.
|
|it should spit out the value of the loading cap.
|
|
|It is a nasty process but someone has to do it.
|
|I found out that if the inductor is too large negative restiance
|appears in the
|
|output value for the loading cap. Also if all goes well the answer to
|the square root will be all resistive with no reactance.
|
|Id post this however the terminal wont handle the APL characters.
|
|
|Lots of luck
|
|Art Young
|
|AC0F