antenna noise bridge - HomeBrew Forum at eHam.net

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eHam.net Forum : HomeBrew : antenna noise bridge

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RE: antenna noise bridge	Reply
by KC8HZM on February 17, 2003	Mail this to a friend!
Hello again Dale, I realize that it has been a week since the last post, but I'm still working on digesting this. Alright, so a 1.1 nF capacitor in series cancels out the inductive reactance of our hypothetical antenna. This leaves us with 34 + 0j ohms. What can be done with that if we don't want to just live with a 1.5:1 mismatch? Ok, wait, back up one second. What is the shunt element? Is that the capacitor in our example? Across the load, does that mean parallel? What does across the generator mean? Transmitter? Thanks again, Marten KC8HZM

RE: antenna noise bridge	Reply
by WB6BYU on February 18, 2003	Mail this to a friend!
"Shunt" means in parallel. In this case (by a lucky choice of impedances) we can get a better match by connecting a capacitor across (in parallel with) the load. Generally when we are talking about transmission lines and matching networks we have a "load" that receives power (in this case, the antenna) that has some impedance. There is also a "generator" that provides that power (the transmitter) that has an optimum output impedance. The problem is usually stated as how to transform the load impedance to match that required by the generator to achieve maximum power transfer. None of the concepts are new, I just used different names for them. Congratulations on hanging in there so far!!

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