> Not sure why isolator cause harmonics for it has no > non-linear components. It might cause tx to generate > harmonics. Isolators are on the output of many repeater > transmitters including my UHF Micor and it is built to work > directly into an antenna although most applications use a > duplexer which will give some harmonic suppression.
In the Micor station there is a low-pass (harmonic) filter built into the antenna network. The isolator isn't connected directly to the antenna - jack there's a filter in there to attenuate the harmonics that the isolator produces. If you still don't believe me that ferrite isolators a) generate harmonics and b) can produce IMD, and both are the effect of the non-linear nature of the device: http://www.macom.com/Application%20Notes/pdf/ANI-001.pdf http://www.nardamicrowave.com/east/appnotesrefregpdf/WIRE0048.pdf --- Jeff
