20 kg-Class Ultra-Compact Active Hydrogen Maser — JLT-2520 PRO
Model: JLT-2520 PRO
The JLT-2520 PRO (ECNU-2520 PRO) active hydrogen maser uses an innovative high-Q, low-temperature-drift dielectric microwave cavity together with an integrated getter-and-ion combination pump. This enables the JLT-2520 PRO to provide a standard frequency source with highly stable, low-noise sine wave outputs (5 MHz, 10 MHz, 100 MHz) and a one-pulse-per-second signal (1PPS), with a daily stability better than 8.0×10⁻¹⁶. Its specifications are benchmarked against the VCH2020, and it is a 100% domestically produced substitute.
Applications
- · Time service;
- · Metrology and testing;
- · Space tracking and navigation;
- · Radio astronomy / VLBI;
- · Scientific research.
Specifications
| Waveform | Qty | Amplitude | Bandwidth, ps | Rise time, ns | Interface / Load |
|---|---|---|---|---|---|
| 5 MHz (sine) | 2 | 1 ± 0.2 VRMS | - | - | SMA/50Ω |
| 10 MHz (sine) | 2 | 1 ± 0.2 VRMS | - | - | SMA/50Ω |
| Performance | ||||
|---|---|---|---|---|
| Relative frequency accuracy | ± 3×10⁻¹³ | ≤ ±1×10⁻¹³ | ||
| Frequency stability (Allan deviation at 25±1 °C, environmental effects excluded) | 1 s | ≤ 3.0×10⁻¹³ | ||
| 10 s | ≤ 1.0×10⁻¹⁴ | |||
| 100 s | ≤ 3.0×10⁻¹⁵ | |||
| 1000 s | ≤ 1.0×10⁻¹⁵ | |||
| 3600 s | ≤ 8.0×10⁻¹⁶ | |||
| 86400 s | ≤ 5.0×10⁻¹⁶ | |||
| Phase noise (dBc/Hz) |
Offset | @5MHz | @10MHz | @100MHz |
| 1 Hz | ≤ -118 | ≤ -112 | ≤ -92 | |
| 10 Hz | ≤ -135 | ≤ -129 | ≤ -109 | |
| 100 Hz | ≤ -149 | ≤ -143 | ≤ -122 | |
| 1 kHz | ≤ -156 | ≤ -149 | ≤ -122 | |
| 10 kHz | ≤ -158 | ≤ -153 | ≤ -153 | |
| Frequency drift (after 1 year of operation) | ≤ 5×10⁻¹⁶/day | |||
| Magnetic sensitivity | ≤ 2×10⁻¹⁴/Gauss | |||
| Temperature sensitivity | ≤ 5×10⁻¹⁵/℃ | |||
| Physical Specifications | |
|---|---|
| Dimensions (W × H × D) | 470 mm × 223 mm × 530 mm |
| Weight | ~10kg |
| Operating temperature range (±0.5 °C/hour) | 10–35 °C (recommended +22 °C) |
| Relative humidity | < 80% at +25 °C |