The VCH-103 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
Jitter <40ps
Input signal:
Sync input: 1PPS
Amplitude: ≥2.5V
Pulse Width: ≥100ns
Rise time: <1us
Synchronization accurasy: 25ns
Metrological characteristics are given in the table:
| Frequency stability (Allan deviation) | ||
|---|---|---|
| 0.5 Hz measuring bandwidth | ||
|
1 s
10 s 100 s 1000 s 10000 s Floor* |
≤8·10
−14
≤1.6·10 −14 ≤4·10 −15 ≤2·10 −15 ≤1.5·10 −15 ≤1·10 −15 |
|
| Long term | <3.0E−16 per day** | |
| Auto tuning | no external reference required | |
| Frequency accuracy | ±1·10 −13 | |
| Temperature sensitivity | ≤2·10 −15 / °C | |
| Magnetic sensitivity | ≤±1·10 −14 /Gauss | |
| Power source sensitivity | ≤±1·10 −14 /V | |
| 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):
| Offset from carrier | 5 MHz | 10 MHz | 100 MHz |
| 1 Hz | ≤−125 Bc/Hz | ≤−120 Bc/Hz | ≤−98 Bc/Hz |
| 10 Hz | ≤−140 Bc/Hz | ≤−133 Bc/Hz | ≤−111 Bc/Hz |
| 100 Hz | ≤−150 Bc/Hz | ≤−143 Bc/Hz | ≤−120 Bc/Hz |
| 1 kHz | ≤−155 Bc/Hz | ≤−148 Bc/Hz | ≤−128 Bc/Hz |
| 10 kHz | ≤−155 Bc/Hz | ≤−148 Bc/Hz | ≤−132 Bc/Hz |
| 100 kHz | ≤−155 Bc/Hz | ≤−148 Bc/Hz | ≤−132 Bc/Hz |
Harmonic distortion:
<30 dB (for 5 MHz output).
Non-harmonic distortion:
<−100 dB 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 single phase.
Power consumption:
150 VA ac, 100 W dc.
Standby battery pack:
8 hours operation
External DC input:
22 to 30V DC
Frequency range:
50 Hz
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.
