OSA 3700 Passive Hydrogen Maser Passive Hydrogen Maser Frequency Standard Introduction Modern Time and Frequency applications, such as Metrology, Time Scale, Time comparison, Deep Space mission + VLBI require highly stable frequency references. Meeting such stringent specifications requires 5 MHz the Interrogation signal unit implementation of a Primary Frequency Reference that generates signals with an accuracy better than 1E-12 at all times and very high frequency 1420 MHz 100MHz FLL Processor Indication and control unit Generally, this can be achieved using Cesium or Hydrogen clock technology, often combined Receiver stability (typ sy(t) # 7x10-13 t-1/2 in the time domain. Maser 1420 MHz Hydrogen Quantum discriminator with 100 MHz GPS receivers as backup sources. Central Processor Reference signals unit Unlike off-air receivers, Maser clocks are autonomous, self-contained primary references immune from external influences. 100MHz 2,048 MHz RS-232 Power supply unit 1Hz SYNCH 5 MHz 10 MHz Internal battery Passive Frequency Standard OSA-3700 PHM is the number one alternative to a high performance reference 220 VAC 22-30V when state of the art stability and competitive accuracy are needed at a reasonable price. Highlights Extremely stable frequency reference based on Hydrogen atom transition. Alternative technology to cesium reference sources. Far cheaper than active hydrogen Maser. Low cost hydrogen refurbishment. 2.048/5/10/100 MHz and 1 PPS standard outputs. Low phase noise output. Digital control and monitoring of all operations on LCD display. 10 minutes batteries backup. 3 years warranty on Physics package. Expected lifetime: 10-20 years. Oscilloquartz SA / Rue des Brévards 16 / CH-2002 Neuchâtel Switzerland / Tel.+41(0)32 722 55 55 / Fax+41(0)32 722 55 56 [email protected] / www.oscilloquartz.com Typical Applications Time and frequency measurement equipment Astronomy and space applications Satellite ground station Reference for test equipment and measuring quality of GPS driven oscillators.

OSA 3700 Passive Hydrogen Maser Passive Hydrogen Maser Frequency Standard Principle of operation Hydrogen Maser principle of operation is based on quartz oscillator frequency locked to the frequency line of hydrogen atom influence of emission the of the discriminator discriminator. RF-cavity The frequency fluctuation on emission line is eliminated by RF-cavity frequency adjustment to quartz oscillator frequency. As discriminator energy level emitted by hydrogen atoms is less than the sum of loss energy, FM excitation signal is introduced into the discriminator cavity to provide spectral line...