![RB20S0: Rubidium oscillator (GPS proofreading type) [Product code: 3273B]](../images/system/R_RB20S0_web.jpg)
This equipment is a highly accurate 10MHz standard signal generator with a rubidium oscillator. By using it, the output frequency becomes enough as precision, a stability level, and a frequency criterion of broadcasting and the telecommunication system. The power supply corresponds to external DC power (DC+48V).
By the GPS proofreading function, the frequency of the rubidium oscillator is controlled by the signal that receives the GPS electric wave and reproduces, When proofreading is operated. For the long term, a standard signal with good frequency stability level of maintenance free can be generated. The GPS reception is always done, and measures the frequency of a standard signal. The frequency adjustment operation can start promptly when beginning to proofread, and the proofreading time can be shortened. After the proofreading ends, two (the mode that continues the frequency control by GPS and the stopping mode) can be selected.
The proofreading operation can be operated by the manual operation with the panel side switch and a remote control operation.
It can output one second Signal (1PPS) that synchronizes with UTC at the same time. As for 1PPS, the signal from the GPS reception module is output directly. Only when GPS is received, 1PPS signal is output. Therefore, the phase of an output frequency standard signal and 1PPS signal is not corresponding.
GPS antenna corresponding to the snow ground and a coaxial arrestor are prepared as an option.
| Item | Number | Remarks |
| Main body | 1 | - |
| Connector for external DC power supply |
1 | RM15type 2pin |
| Connector for ALARM output | 1 | D-sub 25P (M2.6 screw) |
| GPS antenna | 1 | With installation fitting metal |
| Coaxial cable | 1 | For GPS antenna connection (5D-FBEquivalent goods Length 50m)* |
| Manual | 1 | - |
| Examination result book | 1 | - |
* It is possible to allow it up to 50m in total length for 5D-FB. The cable loss is 15dB or less in 1.6GHz.
| Main body | External size | 480(W) x 49(H) x 350(D) mm | |
| Store in JIS standard rack. | |||
| Mass | 7.5 kg or less | ||
| GPS antenna | External size | Length | 204 mm |
| Diameter | 69 mm | ||
| Mass | About 0.4 kg | ||
| Diameter of installation Paul | 35 mm to 50 mm | ||
* Excluding protrusions.
| Antenna input | Input signal | GPS signal (L1) | |
| Connector | TNC-J | ||
| Impedance | 50Ω | ||
| Standard signal output | Frequency | 10MHz | |
| Number of outputs | 8(Back panel), 1(Front panel - monitor) |
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| Connector | BNC-J | ||
| Impedance | 50Ω | ||
| Output level | 0dBm | ||
| Monitor level | 0dBm | ||
| 1PPS output | Number of outputs | 8(Back panel), 1(Front panel - monitor) |
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| Connector | BNC-J | ||
| Impedance | 50Ω The pull-down at the terminal. The pull-up is improper. |
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| Output level | TTL level | ||
| Pulse width | 0.5s It provides for the timing at a positive second by the rising edge. The standing fall can change by an internal setting. |
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| Output condition | When GPS is received. | ||
| Power supply indicate | Power ON | Green | |
| Power OFF | Turning off | ||
| GPS receive indicate | 4 or more of reception satellites | Green | |
| 1 to 3 of reception satellites | Orange | ||
| Non receiving | Red | ||
| Status indicate | Normal | Green | |
| ALARM | Red when Power supply abnormal, Rb Oscillator PLL abnormal, Rb Oscillator level abnormal, 1PPS out abnormal, FAN abnormal, or Frequency abnormal) |
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| Proofreading mode indicate | Executing | Orange | |
| Finishing/Continuous controlling | Green | ||
| Free run | Turning off | ||
| Alarm output | Output item (); output condition |
Power failure (When internal circuit operation voltage generation DC/DC converter input voltage decreases to +22V or less) |
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| Rb Oscillator PLL abnormal (When 10MHz generation circuit PLL in Rb oscillation module is an unlock) |
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| Rb Oscillator level abnormal (When the Rb oscillation module output level decreases by 3dB or more) |
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| 1PPS out abnormal (In either of 1PPS output, when VOH becomes 2.0V or less or VOL becomes 0.8V or more, or 1PPS signal output stops,) |
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| FAN abnormal (When the cooling fan stops) |
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| GPS receiving abnormal (when the number of reception satellites is 3 or less. Delay time is 10 seconds.) |
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| Frequency abnormal (When GPS is received by the free run, the frequency error margin is ±3 x 10E-10 or more.) |
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| Total alarm (When either of seven above-mentioned items is generated) |
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| Power SW operation caution (SW alert) |
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| Interface | Point of contact is ON when abnormal. When power supply abnormal, outputs at power OFF. (Photo-Moseley, Power SW operation caution is outputted SW Supplementary point of contact. |
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| Connector | D-sub 25S(M2.6 screw) | ||
| Contact volume | AC/DC50V 100mA | ||
| Interface | RS-232 | The location information, time information, and Alarm information are output. | |
| The length of the coaxial cable etc. can be external set. | |||
| Cooling method | Forced air cooling with fan(The life expectancy of fan : for 100,000 hours when Operation always.) | ||
| Power supply | Voltage | DC+48V ±15% | |
| Power consumption |
At start | 65W or less | |
| When regular | 35W or less | ||
| Use conditions | Continuous use | ||
| Environmental requirements | Temperature | -10°C to +45°C (Range for in-spec) | |
| -20°C to +60°C (Range for spec restorable) | |||
| Humidity | 45% to 90%RH (Without dew.) | ||
| GPS Antenna | Power supply | DC +5V (Supplied from oscillator) | |
| Use conditions | Continuous use | ||
| Performance maintenance |
Temperature | -25 to +70°C | |
| Humidity | 20 to 100% | ||
| Standard Frequency output | Frequency precision | ±5 x 10E-11 or less (100s, When proofreading ends) |
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| ±3 x 10E-11 or less (100s, When 24 hours or more pass continuousness controlling) |
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| Frequency stability | 3 x 10E-11 or less(1s) | ||
| 5 x 10E-11 or less/month | |||
| Temperature stability | 5 x 10E-11 or less | ||
| Level precision | ±1dBor less | ||
| Phase noise(SSB) | 1Hz | -100dBc/Hz or less | |
| 10Hz | -130dBc/Hz or less | ||
| 100Hz | -140dBc/Hz or less | ||
| 1kHz | -150dBc/Hz or less | ||
| 10kHz | -150dBc/Hz or less | ||
| Rb oscillator standing up characteristic |
±5 x 10E-11/24hor less | ||
| ±1 x 10E-09/15min (25°C) or less | |||
| Spurious | Harmonic | -25dBc or less | |
| Non harmonic | -50dBc or less | ||
| 1PPS output | Time precision | ±200ns or less, when GPS receiving |
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| Level precision | VOH:2.4V or more | ||
| VOL:0.4V or less | |||
GPS is a positioning system that the United States operates and is managing. The specification of this equipment is based in the state of operation in ICD200C(2000/4). The influence might go out to the performance of this equipment when the operation situation changes.
The signal from the GPS satellite is very slight. It might influence the GPS reception when there is an electric wave sending source in surroundings. Moreover, please it must become difficult to receive in the following places, and avoid such a place and set up the antenna.
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