The RSR-304.30-250-X from Raltron is a SAW Resonator with Frequency 304.05 to 304.55 MHz, Centre Frequency 304.3 MHz, Insertion Loss 2.5 dB (Resonant Loss), Capacitance 4 pF, Operating Temperature -10 to 60 Degree C. Tags: Drop In, SAW Resonator. More details for RSR-304.30-250-X can be seen below.