Mel, I have heard that done, and if it works, great. However, the remanufacturing of typical VHF and UHF circulators almost always involves machining or replacement of the ferrite components. Since the Celwave circulators that started this thread have steel cases, I wonder how an external magnet can affect the internal magnetic field. I certainly agree that a network analyzer is best suited for circulator tuning.
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mel Swanberg Sent: Friday, April 16, 2010 7:23 PM To: [email protected] Subject: RE: [Repeater-Builder] Identify Please A lot of us amateur microwavers retune circulators with external magnets. With a handful of otherwise useless circulators, one could tear one apart, recover the magnets, and apply them to the outside of the case of the unit to be tuned. A network analyzer helps, so you can watch what's happening in both directions, but that's not a requirement. You can tune them up or down quite a bit, depending on the orientation of the external magnets. Once you find a combination that works, the external magnets get glued to the circulator case with epoxy. Mel - WA6JBD
