The DL4 from RN2 Technologies is a Delay Line with Frequency 300 MHz to 2.8 GHz, Group Delay 3.95± 0.1 to 4.20± 0.2 nS, Insertion Loss 1.9 to 4.6 dB, Power 100 W, Return Loss 15 to 20 dB. Tags: Surface mount, Fixed. More details for DL4 can be seen below.