The RSF-442.000-5000-3838-TR from Raltron is a Band Pass Filter with Frequency 439.5 to 444.5 MHz, Bandwidth 5000 kHz, Center Frequency 442 MHz, Insertion Loss 3.5 dB, Rejection 40 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-442.000-5000-3838-TR can be seen below.