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Active Hydrogen Maser VCH-1003M

The VCH-1003M is a high-performance hydrogen maser with low phase noise output signals. Extremely high frequency stability is provided by state-of-the-art technology and internal stand-alone Cavity Auto Tuning system.

Key Applications
- National Time Keeping Service;
- Deep space tracking and navigation;
- VLBI systems;
- GNSS satellite monitoring.

Specifications

Output signals:
two outputs: 5 MHz (sine), 1±0.2 V RMS into 50 Ohms,
two outputs: 10 MHz (sine), 1±0.2 V RMS into 50 Ohms,
two outputs: 100 MHz (sine), 1±0.2 V RMS into 50 Ohms,
two outputs: 1 Hz (pulse):Amplitude: >2.5 V into 50 Ohms; width: (15±5) µs.
Rise time: <3ns

Metrological characteristics are given in the table:
Frequency stability
(Allan deviation)		 Standard Option L
3 Hz measuring
bandwidth		 0.5 Hz measuring
bandwidth		 3 Hz Hz measuring
bandwidth
1 s
10 s
100 s
1000 s
1 hour
1 day*
 ≤1.5×10−13
≤2.5×10−14
≤6×10−15
≤2×10−15
≤1.5×10−15
≤7×10−16
 ≤6×10−14
≤1.3×10−14
≤3.6×10−15
≤1.5×10−15
≤1.5×10−15
≤5.0×10−16
 ≤8×10−14
≤1.4×10−14
≤4.0×10−15
≤1.5×10−15
≤1.5×10−15
≤5.0×10−16
Long term <3.0E−16 per day**
Auto tuning no external reference required
Frequency accuracy ±1×10−13
Temperature sensitivity ≤±1.5×10−15/ °C
Magnetic sensitivity ≤5×10−15/Gauss
Frequency trim range 1×10−10
Setting resolution 1×10−16
* Specified only under laboratory conditions: at ±1 °C ambient temperature change in 10−35 °C operating temperature range.
**Achieved after 1 year of unperturbed, continuous operation.


Phase noise (SSB Phase Noise, dBc/Hz):
Standard Option L
Offset from
carrier		 5 MHz 10 MHz 100 MHz 5 MHz 10 MHz 100 MHz
1 Hz ≤−118 ≤−112 ≤−92 ≤−130 ≤−121 ≤−100
10 Hz ≤−135 ≤−129 ≤−109 ≤−141 ≤−135 ≤−115
100 Hz ≤−149 ≤−143 ≤−122 ≤−151 ≤−145 ≤−125
1 kHz ≤−156 ≤−149 ≤−122 ≤−156 ≤−150 ≤−130
10 kHz ≤−158 ≤−150 ≤−152 ≤−159 ≤−153 ≤−153
100 kHz ≤−158 ≤−150 ≤−152 ≤−159 ≤−153 ≤−153

Harmonic distortion: ≤−40 dBc (for 5 MHz output).
Non-harmonic distortion: <−100 dBc in the range from 10 Hz to 10 kHz.

Full data monitoring and functions control (local or remote through any network) are performed by personal computer (not included in delivery set). Application software running under Microsoft Windows is applied.

Power: 84 to 264 V AC (47−60Hz).
Power consumption: 150 VA ac, 100 W dc.
Operating temperature range: 10...35 °C.
Storage temperature range: −30...50 °C.
Humidity: up to 80% at 25 °C.
Dimensions (W×H×D): 550×1010×550mm.
Weight: 100 kg.
Lifetime: 15 years.

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