The ACTR318/318.0/TO39 from Advanced Crystal Technology is a SAW Resonator with Frequency 317.925 to 318.075 MHz, Centre Frequency 318 MHz, Insertion Loss 1 to 1.8 dB, Capacitance 2.4 to 3 pF, Quality Factor Loaded 1900. Tags: Drop In, SAW Resonator. More details for ACTR318/318.0/TO39 can be seen below.