The 2838-30-SMA from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 125 to 155 MHz, Bandwidth 30 MHz, Center Frequency 140 MHz, Insertion Loss 1.5 dB, Rejection 40 dB. Tags: Module with Connectors, Lumped Component Filter. More details for 2838-30-SMA can be seen below.