The 2739 from KR Electronics (A Division of NIC) is a Low Pass RF Filter with Frequency DC to 89 MHz, Stopband Frequency 102 MHz, 3 dB Cutoff Frequency 89 MHz, Lower Rejection 30 dB@102 MHz, Upper Rejection 2 dB@102 MHz. Tags: Plug In. More details for 2739 can be seen below.