The ACTR434A/434.42/TO39 from Advanced Crystal Technology is a SAW Resonator with Frequency 434.345 to 434.495 MHz, Centre Frequency 434.42 MHz, Insertion Loss 1.3 to 2 dB, Capacitance 1.55 to 2.15 pF, Quality Factor Loaded 1900. Tags: Drop In, SAW Resonator. More details for ACTR434A/434.42/TO39 can be seen below.