The 28-65-08A from TX RX Systems is a RF Duplexer with Frequency 406 to 430 MHz, Band 1 406 to 430 MHz, Power 100 W, Insertion Loss 1.2 dB, Isolation 35 dB (Between Channel), 80 dB (Per Channel). Tags: Rack Mount. More details for 28-65-08A can be seen below.