The AM Forum

16 different networks

http://home.sandiego.edu/~ekim/e194rfs01/jwmatcher/matcher2.html

Helpful hints:


"3.8e6"  would mean 3.8 mhz.  

Source resistance of the final stage = estimated working E/I *  class factor.

The third example down on the right is a pi-network.

The sixth example down is a Pi-L.

Otherwise it's pretty straightforward.

T

"Source resistance of the final stage = estimated working E/I *  class factor. "

I remember Vcc^2  / 2 x power output.  Is there a published reference of class factors for various angles of conduction, including D / E?  And push-pull would be 1/2 the single-ended since twice the conduction time?

Chris

Chris,

When you come back down this way, the "T Network" I have, well I need to understand it better. Why not write a small handbook, "T-Networks" for Dummies! (HA!)

Scott

First, answering my own earlier question, during my revisit to tube RF amp output network design, K factors are given in several of my editions of the ARRL Handbook as:
1.3 for class A, 1.5 to 1.7 for class AB, 1.57 to 1.8 for class B, and finally 2 for class C.
As amplifiers become more efficient, the optimal load impedance relative to the stage’s DC impedance decreases.

Scott,

No need to write one because there already exists The ARRL Handbook.  I buy one about every five years, and my 2010 edition can now be bought used for $20 online.  This is the most accessible and comprehensive book available.  My advice would be to:

1.   Buy the book.
2.   Learn AC theory elements: Resistance, Reactance, Impedance. 
3.   Enjoy the numerous handbook discussions about impedance matching.
4.   Very helpful, but not essential – learn the Smith chart.
5.   Download the excellent freeware “QuickSmith”
6.   Build a Tee network at your frequency and experiment with values.

Nathan Iyer’s excellent Smith chart and impedance matching program:

http://www.nathaniyer.com/qsdw.htm

73
Chris