The 2812 from KR Electronics (A Division of NIC) is a Low Pass RF Filter with Frequency DC to 174 MHz, Stopband Frequency 225 MHz, 3 dB Cutoff Frequency 174 MHz, Lower Rejection 50 dB@225 MHz, Upper Rejection 2 dB@225 MHz. Tags: Module with Connector. More details for 2812 can be seen below.