The 28-65-02B from TX RX Systems is a RF Duplexer with Frequency 406 to 430 MHz, Band 1 406 to 430 MHz, Power 350 W, Insertion Loss 0.8 dB, Isolation 30 dB (Between Channel), 80 dB (Per Channel). Tags: Rack Mount. More details for 28-65-02B can be seen below.