The ACTR345/345.0/TO39 from Advanced Crystal Technology is a SAW Resonator with Frequency 344.93 to 345.07 MHz, Centre Frequency 345 MHz, Insertion Loss 1.4 to 2 dB, Capacitance 2.3 to 2.9 pF, Quality Factor Loaded 1800. Tags: Drop In, SAW Resonator. More details for ACTR345/345.0/TO39 can be seen below.