Hydrogen Maser

Passive / Active Hydrogen Maser

Hydrogen Maser Frequency Standards
When a timing laboratory, VLBI station or GNSS ground segment needs a reference beyond cesium, the hydrogen maser is the benchmark. FCD-Tech B.V. supplies both passive and active hydrogen masers in rack-mount chassis, from cost-effective 10 MHz references to flagship standards reaching 4×10⁻¹⁶ per day.

Passive Hydrogen Maser – SHAO10M
Key Specifications & Performance Features: A 10 MHz standard in a 4U, 20 kg chassis with dual SMA outputs and RS-232/LAN control. Typical day-scale stability is 2.00×10⁻¹⁵ for the high-performance version and 6.33×10⁻¹⁵ for the standard version.

Applications: Telecom primary reference clocks, GNSS ground stations and calibration laboratories that need maser-grade stability at a lower cost of ownership.

Compact Active Hydrogen Masers – FCNU-2310-PRO / MAX
Key Specifications & Performance Features: Dual 5 MHz and dual 10 MHz outputs in a 4U chassis weighing only 10–12 kg. Allan deviation reaches ≤9.0×10⁻¹⁶ per day (MAX), with long-term drift ≤1×10⁻¹⁵ per day after one year, phase noise ≤−155 dBc/Hz at 10 kHz (5 MHz) and magnetic sensitivity ≤1×10⁻¹⁴ per Gauss.

Applications: National timekeeping, metrology, tracking and navigation, and cooperative timing network nodes.

High-Performance Active Hydrogen Masers – FCNU-2520-PRO / MAX
Key Specifications & Performance Features: 5, 10 and 100 MHz outputs plus a 1 PPS timing output. The PRO combines a high-Q dielectric cavity with a hybrid sorption and ion pump vacuum system. Allan deviation reaches ≤4.0×10⁻¹⁶ per day (MAX), with drift ≤5×10⁻¹⁶ per day and temperature sensitivity ≤5×10⁻¹⁵ per °C.

Applications: Radio astronomy and VLBI, deep-space tracking, master clocks for national time scales and reference sources for time and frequency measurement systems.

Choosing the Right Maser
Choose the SHAO10M for a cost-effective 10 MHz master reference, the FCNU-2310 for active-maser performance in a compact, lightweight chassis, and the FCNU-2520 when lowest drift, 100 MHz output and 1 PPS timing matter most.

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Model	Frequency Range	Size	Features
SHAO10M PHM	10MHz	483 × 177.5 × 500 mm	Passive Hydrogen Maser, Ground-Based 10 MHz Frequency Standard Standard and High-Performance Versions Day-Scale Stability 2.00·10⁻¹⁵ (High-Performance), 6.33·10⁻¹⁵ (Standard), typ. Allan Deviation 8.86·10⁻¹⁵ @ 1,000 s, 3.31·10⁻¹⁵ @ 10,000 s (High-Performance, typ.) Dual 10 MHz Outputs (CH1, CH2), SMA Connectors Remote Control and Monitoring via RS-232 and LAN 4U 19-inch Rack-Mount Chassis (483 x 177.5 x 500 mm), 20 kg, 230 V AC Applications: Time & Frequency Labs, GNSS Ground Stations, VLBI Radio Astronomy, Telecom Primary Reference Clocks....
FCNU-2310-PRO	5MHz & 10MHz	470 mm × 200 mm × 530 mm	Active Hydrogen Maser in 4U Rack-Mount Chassis (approx. 10 kg) Outputs: 2× 5 MHz and 2× 10 MHz sine (1 ±0.2 Vrms, SMA, 50 Ω) Allan Deviation ≤5.0×10⁻¹⁴ (100 s), ≤4.0×10⁻¹⁵ (1 day) Long-Term Drift ≤1×10⁻¹⁵/day (after 1 year) Phase Noise ≤-155 dBc/Hz (5 MHz) / ≤-150 dBc/Hz (10 MHz) @ 10 kHz Temperature Sensitivity ≤2×10⁻¹⁴/°C, Magnetic ≤1×10⁻¹⁴/Gauss Optional RS-232C, USB, Ethernet; Cooperative Timing Network Node Applications: Metrology, Timekeeping, Tracking & Navigation, Scientific Research
FCNU-2310-MAX	5MHz & 10MHz	470 mm × 200 mm × 530 mm	Active Hydrogen Maser in 4U Rack-Mount Chassis (approx. 12 kg) Outputs: 2× 5 MHz and 2× 10 MHz sine (1 ±0.2 Vrms, SMA, 50 Ω) Allan Deviation ≤2.0×10⁻¹⁴ (100 s), ≤6.0×10⁻¹⁵ (1000 s), ≤9.0×10⁻¹⁶ (1 day) Long-Term Drift ≤1×10⁻¹⁵/day (after 1 year) Phase Noise ≤-125 dBc/Hz @ 1 Hz, ≤-155 dBc/Hz @ 10 kHz (5 MHz) Temperature Sensitivity ≤1×10⁻¹⁴/°C, Magnetic ≤1×10⁻¹⁴/Gauss RS-232C, USB, Ethernet for Remote Monitoring & Control (standard) Applications: National Timekeeping, Space Tracking & Navigation, Metrology, Research
FCNU-2520-PRO	5MHz, 10MHz & 100MHz	470 mm × 223 mm × 530 mm	Active Hydrogen Maser with High-Q Dielectric Cavity (approx. 20 kg) Hybrid Vacuum System: Sorption Pump + Ion Pump Outputs: 5 MHz, 10 MHz, 100 MHz sine + 1 PPS timing output Allan Deviation ≤3.0×10⁻¹⁵ (100 s), ≤8.0×10⁻¹⁶ (1 h), ≤5.0×10⁻¹⁶ (1 day) Long-Term Drift ≤5×10⁻¹⁶/day (after 1 year) Phase Noise ≤-158 dBc/Hz @ 10 kHz (5 MHz), ≤-153 dBc/Hz (10/100 MHz) Temperature Sensitivity ≤5×10⁻¹⁵/°C, Magnetic ≤2×10⁻¹⁴/Gauss Applications: Timekeeping, Radio Astronomy & VLBI, Space Tracking, Metrology
FCNU-2520-MAX	5MHz, 10MHz & 100MHz	470 mm × 223 mm × 530 mm	High-Performance Active Hydrogen Maser (approx. 20 kg) Outputs: 5 MHz, 10 MHz, 100 MHz sine + 1 PPS timing output Allan Deviation ≤1.0×10⁻¹³ (1 s), ≤3.0×10⁻¹⁵ (100 s), ≤4.0×10⁻¹⁶ (1 day) Long-Term Drift ≤5×10⁻¹⁶/day (after 1 year) Phase Noise ≤-158 dBc/Hz @ 10 kHz (5 MHz), ≤-130 dBc/Hz @ 1 kHz (100 MHz) Temperature Sensitivity ≤5×10⁻¹⁵/°C, Magnetic ≤1×10⁻¹⁴/Gauss Stand-Alone Reference or Source for Time & Frequency Measurement Systems Applications: Timekeeping, Radio Astronomy & VLBI, Space Tracking, Metrology

Hydrogen Maser

SHAO10M PHM

FCNU-2310-PRO

FCNU-2310-MAX

FCNU-2520-PRO

FCNU-2520-MAX

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