Mel - Looks like you could have a side job re-working these things for hams.
Chuck WB2EDV ----- Original Message ----- From: "Mel Swanberg" <[email protected]> To: <[email protected]> Sent: Saturday, April 17, 2010 12:00 AM Subject: RE: [Repeater-Builder] Identify Please Hi Eric, The steel cases are not an impediment to the magnetic field, at least not enough to make retuning impossible. Microwave type circulators are built in a similar fashion, just smaller, and the technique is well known among those of us who play in the microwave region. Just to give an idea of the magnitude of change that's possible, 1.8 GHz circulators can be moved up to 2304, and I have moved 11.7 GHz circulators down to 10368 MHz. I haven't specifically attempted to move 870 MHz circulators up to 928, but I see no reason why this couldn't at least be attempted if someone was so inclined. If someone wants to attempt it, you can either dissect an unwanted circulator, or maybe better yet, use some of those extremely powerful rare earth magnets. I buy 'em by the handful at the county fairs for cheap, just to have them around for such purpose. The network analyzer makes it seem stupidly simple, but a SA/TG would work nearly as well. Just remember to check it both ways before you apply the glue. Mel - WA6JBD >
