Crystek Corporation? has been providing frequency products since 1958, including quartz crystals, XOs (Clock Oscillators), TCXOs (Temperature Compensated Crystal Oscillators), VCOs (Voltage Controlled Oscillators), and VCXOs (Voltage Controlled Crystal Oscillators). Crystek operates two divisions dedicated to frequency control. Crystek Crystals is dedicated to the development and manufacture of frequency products using quartz-based resonators. Crystek Microwave develops frequency control and support products for the microwave industry. Other products include: PLL (Phase Lock Loop) Synthesizers, RedBox VCOs, RF Coaxial Cable Assemblies, RF Cable Connectors, Bulk RF Coaxial Cable, RF Power Detectors, Filters, Attenuators, DC Blocks, Passive Doublers, RFPRO (Pocket Reference Oscillators), Connectorized Amplifiers, VCO Evaluation Boards, RF Lab Kits, SAW based Clock Oscillators and VCSOs, and Power Regulators.