The 28-65-07B from TX RX Systems is a RF Duplexer with Frequency 406 to 430 MHz, Band 1 406 to 430 MHz, Power 250 W, Insertion Loss 1.25 dB, Isolation 60 dB (Between Channel), 85 dB (Per Channel). Tags: Rack Mount. More details for 28-65-07B can be seen below.