![]() Transmission Line Transformers by Jerry Sevick High to Low Avg. For it also seems to suffers from Current-vs-Voltage confusion affliction - For the record the Guanella balun is NOT a voltage balun.When properly designed, they can have extremely high efficiencies and very broad bandwidths. Brown k9YC APR-2008.pdf ( PDF), but with a warning. Bertran vk2DQ 2005 OCF dipole.pdf ( PDF superd, must read!!) Flame On QRPers!Īs to not become the Andy-Rooney-of-HAM-radio with my Casandra like opinions, I will share with you that I did find a few articles (Free PDF) on the web that are very helpful, and go a long way towards really being helpful.Ĭ. I post this rather negative review at great peril to myself, because HAMs are a funny lot ( as in not "ha-ha"), and are very similar to sheep, and do not take kindly to folks having a difference of opinion on something they hold sacrosanct. ![]() Like the little boy in Hans Christian Andersen's story, " The Emperor’s New Suit". I have posted both of the articles above so that you may acquaint yourselves with their genius. Ruthroff August 1959 equally seminal article ( PDF) - I'm sorry, I had missed that one too, as I imagine most modern readers will have (as in 'we were not born yet!?') and my subscription to the BBR is still in the mail. The article also constantly referred to C. ![]() Guanella in the Brown Boveri Review in September of 1944 ( PDF) but never really takes the time the explain to the modern reader the construction outlined in the article. The author constantly refers to the seminal publication of G. In many cases the author warns the reader of the evils of voltage baluns ( probably a true statement), but then extols the superb benefits and divine merits of Ruthroff's work on the same. What I can and will say is I did not enjoy it, and I found it to be contradictory, weak and misleading. To the say the book is badly written, I will not say, I'm no English major myself, and I'll leave that to others. I found the book to be at best a loosely coupled collection of articles which seems to start in the middle of basic ideas, and seem to trail on and then abruptly end. I wish I could tell that it were true, in short they are all wrong and I would strongly suspect not one of them actually read the book. ![]() I ordered it.Ģ0 bucks and a few days later. ![]() coils) and all other things of an inductive nature.Īfter the normal frenzy of Google searches, I was lead to - " Understanding, Building, and Using Baluns and Ununs" by Jerry Sevick, W2FMI - This book is presented (ARRL, eham, and everyone else) to be universally touted as the pinnacle and the state of the art for those seeking a deeper understanding and actually building. I have been trying to increase my personal understanding of coils as used for antennas (as baluns) and as they are used in band-pass-filters (ummm, as well. As you may already know, I have developed a wholesale interested in coils. ![]()
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