The FNP-1236 from Filtronetics is a Low Pass RF Filter with Frequency DC to 1350 MHz, Bandwidth 1350 MHz, Stopband Frequency 1660 MHz, 3 dB Cutoff Frequency 1350 MHz, Insertion Loss 1.5 dB. Tags: Module with Connector, Lumped Component Filter. More details for FNP-1236 can be seen below.