Active Hydrogen Maser VCH-1003M

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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.

Manual for VCH-1003M
– Operation Manual download
– User Guide download


Typical test results

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 Option LT
3 Hz measuring
bandwidth
0.5 Hz measuring
bandwidth
3 Hz measuring
bandwidth
0.5 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 *
≤5·10 −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 *
≤8·10 −14
≤1.4·10 −14
≤4.0·10 −15
≤1.5·10 −15
≤1.0·10 −15
≤4.0·10 −16 **
Long term <3.0 −16 per day***
Auto tuning no external reference required
Frequency accuracy ±3·10 −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: ambient temperature in the range ±1 °С, changing rate <1 °C/hour. ADEV at 1 day is specified for measurements with removed linear frequency drift.
**Specified only under laboratory conditions: ambient temperature in the range ±0.1 °С, changing rate <0.3 °C/hour. ADEV at 1 day is specified for measurements with removed linear frequency drift.
***Achieved after 1 year of unperturbed, continuous operation.

Phase noise (SSB Phase Noise, dBc/Hz):

Standard Option L Option LT
Offset from carrier 5 MHz 10 MHz 100 MHz 5 MHz 10 MHz 100 MHz 5 MHz 10 MHz 100 MHz
1 Hz ≤−118 ≤−112 ≤−92 ≤−130 ≤−121 ≤−100 ≤−122 ≤−116 ≤−96
10 Hz ≤−135 ≤−129 ≤−109 ≤−141 ≤−135 ≤−115 ≤−135 ≤−129 ≤−109
100 Hz ≤−149 ≤−143 ≤−122 ≤−151 ≤−145 ≤−125 ≤−149 ≤−143 ≤−122
1 kHz ≤−156 ≤−149 ≤−122 ≤−156 ≤−150 ≤−130 ≤−156 ≤−149 ≤−130
10 kHz ≤−158 ≤−150 ≤−152 ≤−159 ≤−153 ≤−153 ≤−158 ≤−152 ≤−152
100 kHz ≤−158 ≤−150 ≤−152 ≤−159 ≤−153 ≤−153 ≤−158 ≤−152 ≤−152

Harmonic distortion in 5 MHz output: ≤−30 dB (Standard, Option LT), ≤ -40dB (Option L).
Non-harmonic distortion: <−100 dB in the range from 10 Hz to 10 kHz.

Full data monitoring and functions control. Application software running under Microsoft Windows and Linux (optional).

Power supply: AC(84÷264)V, (47÷60)Hz; DC(22÷30)V.
Power consumption: 150 V·A (AC), 100 W (DC).
Operating temperature range: 10…35 °C.
Storage temperature range: −30…50 °C.
Weight: 105 kg.
Dimensions (W×H×D): 550×1010×550 mm.
Warranty: 3 years (7 years extended).
Lifetime: 15 years.