Sean Breheny wrote: >> Resonance center and pure resistive impedence are not always the >> same thing, although usually close. The resonance peak is usually >> the easiest thing to measure. For quick and dirty tuning it's >> probably enough. > > Olin, can you please elaborate? What criterion are you using to judge > resonance here if not the absence of a reactive component? The easiest way to measure resonance is probably to feed it with a relatively high impedence source and then find the frequency that results i= n the highest amplitude. Unless you've got a very high Q antenna though, the resonance peak and the pure resistive point are going to be close enough that either is fine for tweaking things. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .