David VanHorn <[email protected]> wrote: > We failed emissions by a large margin, and when we went looking for > problems, found that the antenna impedance was way off.
Ah, I see. The problem here is that these baluns are no baluns in the classical sense (magnetically coupled transformers) but lumped LC circuitry that behaves *as if* it were a balun. However, this behaviour will only work if they are operated on their design frequency, and loaded with their design impedance. For anything else, both the balun function and obviously also the filter function suffer. (Magnetically coupled baluns can easily span an order of magitude in their frequency range, and they will simply transform any impedancy mismatch to the other side of the balun.) -- cheers, Joerg .-.-. --... ...-- -.. . DL8DTL http://www.sax.de/~joerg/ Never trust an operating system you don't have sources for. ;-) _______________________________________________ AVR-chat mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/avr-chat
