描述
RCM模块是铷或铯Cleanup振荡器，也可以用作高精度的独立参考源。RCM模块通常用作需要超低相位噪声的雷达应用的本地振荡器。RCM模块提供双隔离100MHz超低相位噪声输出，输出功率为+20.5dBm，相位噪声仅为-100dBc/Hz（10Hz偏移），100MHz载波，本底相位噪声为-172dBc/Hz。RCM模块还提供超稳定的10MHz CMOS输出，并完整处理外部1PPS、10MHz和NMEA时间/日期信号，使其非常适合雷达和同步无线电应用，以及铷或铯参考的相位噪声滤波器应用。RCM模块由+12V电源供电，可以生成NMEA语句，并支持与FireFly兼容的SCPI命令。
特点
- 100MHz，10Hz时为-100dBc/Hz
- 同步到10MHz或1PPS参考
- 产生1PPS输出，典型漂移小于4us/24小时，保持期间，-172dBc/Hz本底噪声
- 坚固耐用，-40℃至+85℃运行
技术参数
| Module Specification: | |||||
| Long-Term Oscillator Aging (without ext. reference – zero aging with ref) | Less than 0.3ppb per month in Holdover without GPS | ||||
| Frequency Stability Over Temperature (in holdover) | Better than ±0.25E-09 -25°C to +75°C) | ||||
| 1 PPS input to output capture resolution | ±2.5ns | ||||
| Frequency Accuracy to external 1 PPS reference | Better than ±3E-010 after 15 minutes after power-on | ||||
| Holdover Drift (after 7 days with external reference) | <±5us over 24 Hour Period @+25°C | ||||
| Auto Reference-switchover and Holdover | 10MHz priority, 1PPS auto-fallback or manual, OCXO Flywheel Holdover | ||||
| 100MHz ADEV (versus external 10MHz reference) | 1s: <1E-12, 10s: <2E-13, 100s <3E-14 | ||||
| 100MHz ADEV (versus external 1 PPS reference) | 1s: <5E-12, 10s: <3E-11, 100s <3E-11, 1Ks: <8E-12, 10Ks: <1E-12 | ||||
| 100MHz to 10MHz phase jitter/wander | <200ps rms | ||||
| 1 PPS Outputs (OCXO Flywheel Generated) | Two outputs, 3.3V CMOS synchronized to 100MHz phase | ||||
| 1 PPS output to 100MHz uncertainty | <±250ps rms | ||||
| External to internal 1PPS syncronization counter resolution | ±2.5ns | ||||
| 1 PPS Output unit to unit uncertainty with common 10MHz ext reference | ±2.5ns | ||||
| 10MHz Output | 1x 5V CMOS 10MHz | ||||
| 100MHz Outputs | 2x Sine Wave +20.5dBm ±1dbm | ||||
| RS-232 Control | Full SCPI-99 Control Commands at 9.6K, 19.2K, 38.4K, 57.6K, 115.2K | ||||
| RS-232 NMEA Output Sentences (with time/date preset) | NMEA 0183 rev. 2.3, Sentences: GGA, RMC, ZDA, PASHR | ||||
| TTL Alarm and Built-In Self-Test (BIT) Output | Oscillator Unlock, Soft- and Hard-Alarm, and Power Supply Failure Alarm | ||||
| Warm Up Time / Stabilization Time Without ext. reference | <7 min at +25°C to <1ppb accuracy Typ. | ||||
| Lock time to external 10MHz reference | <3 seconds warm, <5 minutes cold-start at +25°C | ||||
| Supply Voltage (Vdd) | 11.0V to 14VDC (12V nominal) | ||||
| Power Consumption | <5.8W at +25°C at 12V VDD, 12W warmup for less than 5 minutes | ||||
| Operating Temperature | -40°C to +85°C (forced air) | ||||
| g-sensitivity | <0.3ppb per-g per-axis | ||||
| MTBF | > 500,000 Hours (at +60°C) | ||||
| Ordering Options | Conformally Coated, standard (non-low-g) DOCXO | ||||
| Phase Noise | Offset | 10MHz | 100MHz | ||
| 1Hz | <-90dBc/Hz | <-70dBc/Hz | |||
| 10Hz | <-125dBc/Hz | <-98dBc/Hz | |||
| 100Hz | <-145dBc/Hz | <-128dBc/Hz | |||
| 1KHz | <-150dBc/Hz | <-153dBc/Hz | |||
| 10kHz | <-150dBc/Hz | <-160dBc/Hz | |||
| 100kHz | <-150dBc/Hz | <-165dBc/Hz | |||
| Connectors | RF: UMCC compatible, Power/Comms: 30-pin Samtec TFM-115 series | ||||
