The RSF-284.000-8000-3838-TR-NS2 from Raltron is a Band Pass Filter with Frequency 280 to 288 MHz, Bandwidth 8 MHz, Center Frequency 284 MHz, Insertion Loss 4.5 dB, Rejection 48 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-284.000-8000-3838-TR-NS2 can be seen below.