The 28-69-04A from TX RX Systems is a RF Duplexer with Frequency 470 to 512 MHz, Band 1 470 to 512 MHz, Power 350 W, Insertion Loss 2.2 dB, Isolation 50 dB (Between Channel), 100 dB (Per Channel). Tags: Rack Mount. More details for 28-69-04A can be seen below.