ECS

http://www.ecsxtal.com/index.aspx

ECS Oscillator products include hybrid clock oscillators with a complete range of performance options. ECS hybrid clock oscillators incorporate precision quartz crystal resonators and state-of-the-art technology to combine low cost, high reliability and superior miniaturization. Available packages include dual in-line and PC board mountable designs.
ECS offers a wide selection of monolithic crystal filters both thru hole and surface mount packages. We offer a wide range of center frequencies including 10.7 MHz, 21.4 MHz, 45.0 MHz, 70.0 MHz, and 90.0 MHz. The monolithic crystal filter offers the stability of a quartz device ideal for IF filtering. The monolithic design is both cost effective and space saving; ideal for today's wireless and telecommunications applications.