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.

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.