The 26-66-01A from TX RX Systems is a RF Duplexer with Frequency 442 to 450 MHz, Band 1 442 to 450 MHz, Power 100 W, Insertion Loss 1.2 dB, Isolation 55 dB (Between Channel), 70 dB (Per Channel). Tags: Rack Mount. More details for 26-66-01A can be seen below.