Jeff, A diode is most certainly an active device. Its properities change with exciting voltage and follow many parameters just as a transistor. And there are many ways to make a diode.
You might be right about the ferrite. I am not sure why. Ferrite is a passive substance. 73, ron, n9ee/r >From: Jeff DePolo <[EMAIL PROTECTED]> >Date: 2007/10/23 Tue PM 12:10:33 CDT >To: [email protected] >Subject: RE: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and >reciever noise bud > >> An isolator is linear except with frequency just as a cap or >> inductor or feedline are. > >No, it's not linear. First off, it doesn't satisfy the superposition >principle since it will produce harmonic when fed by a pure sinusoid carrier >(hopefully we can agree to that without added discussion), so right off the >bat it's nonlinear. Furthermore, it's also non-reciprocal; what enters port >1 exits port 2 with little loss, but the converse is not true. > >> What's in an isolator that is >> non-linear. > >Ferrite. > >> It is made of transmission lines, no active >> components > >There's no requirement that there needs to be an active component for the >device or system to be non-linear. A diode is a passive device and it's >certainly not linear. > > --- Jeff > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
