The RSF-441.265-5000-3030-TR from Raltron is a Band Pass Filter with Frequency 438.765 to 443.765 MHz, Bandwidth 5000 kHz, Center Frequency 441.265 MHz, Insertion Loss 2 to 3 dB, Rejection 70 to 40 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-441.265-5000-3030-TR can be seen below.