Question about: Sinclair Technologies YA3-03191-01R1 UHF 4 Cavity (7''x10.75'') Duplexer with 2 Dual Ferrite Isolators, Rack Mount, Adjustable Frequency, Set to Frequencies: TX1: 423.0125, TX3: 423.0125, TX5: 422.2250, TX7: 421.8750, TX9: 421.4000 MHz