The 28-65-05A 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 2.2 dB, Isolation 50 dB (Between Channel), 100 dB (Per Channel). Tags: Rack Mount. More details for 28-65-05A can be seen below.