The ACTR304.3/304.30/TO39 from Advanced Crystal Technology is a SAW Resonator with Frequency 304.225 to 304.375 MHz, Centre Frequency 304.3 MHz, Insertion Loss 1.4 to 2 dB, Capacitance 2.1 to 2.7 pF, Quality Factor Loaded 2200. Tags: Drop In, SAW Resonator. More details for ACTR304.3/304.30/TO39 can be seen below.