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Active Hydrogen Maser VCH-1003MThe 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 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
|
| Long term |
<3.0−16 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 tuning range |
1·10−10 |
| Setting resolution |
1·10−16 |
* Specified only under laboratory conditions: at changing rate <1 °C/hour 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. 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.
Humidity: up to 80% at 25 °C.
Dimensions (W×H×D): 550×1010×550 mm.
Weight: 100 kg.
Warranty: 3 years (7 years extended).
Lifetime: 15 years.
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