Members of Repeater Builder have been very helpful in my effort to improve the operation of a 440 repeater. The de-sense problem is reduced now by the addition of another cavity, a band pass cavity on the receive leg. Now I am wondering whether a circulator would provide additional isolation and further decrease the de-sense problem. Your advice would be much appreciated.
I have no idea where to get a circulator or what to expect it to cost. If you think a circulator would help, perhaps you can suggest sources and prices. Thanks. John Transue P.S. Additional info: The repeater runs about 90 watts into the duplexer. The duplexer is a Motorola T-1504A. The separation is 5 MHz. It operates in the ham band.
