The 2401 from KR Electronics (A Division of NIC) is a Diplexer with Frequency f1 DC to 42 MHz, Frequency f2 54 to 870 MHz, Attenuation 60 to 65 dB, Attenuation f1 60 to 65 dB, Attenuation f2 60 to 65 dB. Tags: Surface Mount. More details for 2401 can be seen below.