For some large number of years now (comin' up hard on 40) I've used the y-parameter analysis of Hejhall in Motorola app note AN215 and it has served me well.
Recently I did a sort of oddball design and Hejhall's numbers weren't working. I decided to see of Hejhall and Norris' numbers (Motorola app note
166) correlated and much to my surprise they didn't.So I attempted to convert y-parameters to s-parameters in HP's AN-95 routines and things got squirrelyer yet.
Hardy's book (HF Circuit Design) gave different answers. Krauss, Bostian, and Raab (Solid State Radio Engineering) ... different again.
One of two things is true. Either all these folks have a little difference in their analysis and reasoning OR Excel's method of handling imaginary numbers isn't the real world. Before I go into a long song and dance to check Excel's routines (nontrivial task), I'd appreciate comments from you all about the subject.
BTW, it's not rocket science ... a simple 2N5770 (2N918 in drag) common emitter at 75 MHz..
Jim