The 28-70-14A from TX RX Systems is a RF Duplexer with Frequency 450 to 470 MHz, Band 1 450 to 470 MHz, Power 100 W, Insertion Loss 1.2 dB, Isolation 35 dB (Between Channel), 80 dB (Per Channel). Tags: Rack Mount. More details for 28-70-14A can be seen below.