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SIM940 10 MHz Rubidium Oscillator Module
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The SIM940 integrates a rubidium oscillator (SRS model PRS10) into the SIM900 platform. It provides stable and reliable performance with an estimated 20 year aging of less than |
SIM940 10 MHz Rubidium Oscillator Module
SIM940 10 MHz Rubidium Oscillator Module
SIM940
The SIM940 integrates a rubidium oscillator (SRS model PRS10) into the SIM900 platform. It provides stable and reliable performance with an estimated 20 year aging of less than
There are three 10 MHz outputs with exceptionally low phase noise
All functions of the SIM940 can be controlled from a computer via the SIM900 Mainframe. Both
SIM940 Specifications |
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Output |
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| Output frequencies | 10 MHz sine, 10 µs wide 1 pps pulse |
| Amplitude (±10 %) | 0.5 Vrms (+7 dBm) into 50 Ω |
| 1 pps pulse amplitude | 2.5 V into 50 Ω, 5 V into high impedance loads |
| Phase noise (SSB) | <-130 dBc/Hz (10 Hz) <-140 dBc/Hz (100 Hz) <-150 dBc/Hz (1 kHz) <-155 dBc/Hz (10 kHz) |
| Spurious | <-100 dBc (100 kHz BW) |
| Harmonics | <-60 dBc |
| Accuracy at shipment | ±5×10-11 |
| Aging (after 30 days) | <5 × 10-11 (monthly) <5 × 10-10 (yearly) 5 × 10-9 (20 years, typ.) |
| Short-term stability (Allan variance) |
<2 × 10-11 (1 s) <1 × 10-11 (10 s) <2 × 10-12 (100 s) |
| Holdover | 72 hour Stratum 1 level (1 × 10-11) |
| Frequency retrace | ±5 × 10-11 (72 hrs. off, then 72 hrs. on) |
| Settability | <5 × 10-12 |
| Trim range | ±2 × 10-9 (0 to 5 VDC) ±0.5 ppm (via remote interface) |
| Warm-up time | <6 minutes (time to lock) <7 minutes (time to |
Front-Panel Indicators (LEDs) |
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| Locked | Indicates frequency is locked to rubidium |
| Unlocked | Indicates when frequency is unlocked |
| 1 pps input | Blinks with each 1 pps reference input applied to rear panel |
| 1 pps sync | "On" when 1 pps output is synchronized within ±1 µs of 1 pps input |
Rear-Panel Connections |
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| Frequency adjust | 0 to 5 VDC adjusts frequency by ±0.002 ppm (normally unconnected) |
| 1 pps input | One 100 kΩ input. Requires CMOS level pulses (0 to 5 VDC). If an external 1 pps input is applied, lock is maintained between the 1 pps input and 1 pps output with computer adjustable time constant from 8 minutes to 18 hours. |
| 10 MHz outputs | Three 50 Ω, isolated 10 MHz sine outputs |
| 1 pps output | 50 Ω pulse output |
| DB15(M) | SIM interface (power and communication) |
Environmental |
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| Operating temperature | +10 °C to +40 °C |
| Temperature stability | Δf/f < ±1 × 10-10 (+10 °C to +40 °C) |
| Storage temperature | -55 °C to +85 °C |
| Magnetic field | Δf/f < 2 × 10-10 for 1 Gauss field reversal |
| Relative humidity | 95 % (non-condensing) |
General |
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| Power | Power supplied by the SIM900 Mainframe, or optionally by a user-supplied 24 VDC power supply (2.2 A upon start-up, 0.6 A after warm-up period) |
| Interface | Serial via SIM interface, direct to PRS10 |
| Dimensions, weight | 3.0" × 3.6" × 7.0" (WHL), 5 lbs. |
| Warranty | One year parts and labor on defects in materials and workmanship |
