TRA85 High-performance Rubidium atomic clock

TRA85 Low Phase Noise Rubidium Oscillator

The TRA85 is a high-performance rubidium atomic clock with excellent long-term stability, low phase noise, and fast lock capability. Utilizing advanced digital control and a temperature-controlled package design, it supports 1PPS and 10MHz outputs, achieving a frequency stability of 3E-12/1s. Its 10MHz short-term stability is comparable to that of mid-range cesium clocks, offering excellent value for money. It is suitable for high-precision applications such as radar, communications, metrology and calibration, astronomy, electronic countermeasures, and aerospace measurement and control.

TRA85 High-performance Rubidium atomic clock

TRA85 Low Phase Noise Rubidium Oscillator

The TRA85 is a high-performance rubidium atomic clock with excellent long-term stability, low phase noise, and fast lock capability. Utilizing advanced digital control and a temperature-controlled package design, it supports 1PPS and 10MHz outputs, achieving a frequency stability of 3E-12/1s. Its 10MHz short-term stability is comparable to that of mid-range cesium clocks, offering excellent value for money. It is suitable for high-precision applications such as radar, communications, metrology and calibration, astronomy, electronic countermeasures, and aerospace measurement and control.

TRA85 High-performance Rubidium atomic clock

Important Features

  • Operating temperature range -40℃ ~+65℃
  • The short-term stability is better than the 3E-12/1s
  • Room temperature stable power ≤ 15W
  • Low aging rate,low temperature frequency coefficient full temperature range＜ 2E-10,preferably to ＜ 5E-11
  • High stability and low phase noise,with a typical value of -135dBc/Hz@10Hz
  • 1PPS taming and 10MHz calibration
TRA85 Data Sheet

Important Features

Test ItemConditionTechnical Indicators
Output frequency10MHz，1-way sine wave（50Ω，≥7dBm）
Factory accuracy≤5×10-¹¹¹
Frequency controlVoltage pressure contorl0~5V，with the total range of at least ±1.5×10⁻⁹
Frequency controlInstruction adjustmentSeamless adjustment range of at least ±1×10⁻⁶，Resolution 6.81×10⁻¹³
Locking timeIndoor temperature≤5min
Frequency stability1s≤3×10-¹²
Frequency stability10s≤1.5×10-¹²
Frequency stability100s≤5×10-¹³
Phase noise1Hz≤-95dBc/Hz
Phase noise10Hz≤-130dBc/Hz
Phase noise100Hz≤-150dBc/Hz
Phase noise1kHz≤-160dBc/Hz
Phase noise10kHz≤-160dBc/Hz
Frequency drift rate±1×10⁻¹²/day，±3×10⁻¹¹/month；FD5：±5×10⁻¹³/day，±1×10⁻¹¹/month
Frequency reproducibilitySwitch 24h±2 x 10-¹¹
Temperature and Frequency Characteristics≤2×10-¹⁰; TC1: ≤1×10-¹⁰; TC0.5: ≤5×10-¹¹
Harmonic And Clutterharmonic≤-30dBc，clutter≤-80dBc
Working temperatureBottom plate temperature-40℃~+65℃
Storage temperature-40℃~+85℃
power supply±4%+12V~+15V or +24V
Rate of workPreheat≤45W
Rate of workSteady state （+25℃）≤15W
External DimensionBody size116mm×79mm×38mm
External DimensionBottom plate size127mm x 93mm
Weight≤500g
1PPS input+3V~+5V TTL，Judder<300ns，Pulse width＞100ns
1PPS outputRising edge/falling edge：≤10ns，Pulse width：1us~999ms
Taming accuracyAfter 24h of synchronizationTaming jet lag：±50ns，Time-keeping accuracy：≤1us@24h，Frequency accuracy：≤1×10⁻¹²@24h

Typical phase noise

Frequency stability typical value

Product Model List

Specifications T710T760T640T770TRA85TRS75TCA55TRM60CX5228CX910
External Synchronization InputGNSS ✓✓✓✓——————
1PPS ✓——✓✓✓✓✓——
10MHz ———✓——————
Frequency Output10 MHz sine wave 8-channel4-channel4-channelRoute 51-way1-way——1-way4-channel
10 MHz square wave Route 6—————1-way1-way——
Optional 1/5 MHz100MHz100MHz5/100 MHz——————
—NTPIRIG-B———————
Stability1s <3E-12<5E-12<3E-12≤4E-13≤ 3×10⁻¹²≤ 6×10⁻¹²≤ 8×10⁻¹¹≤ 3×10⁻¹¹≤ 1.5×10⁻¹³≤ 1.1×10⁻¹³
10s <3E-12<5E-12<3E-12≤3E-13 ≤ 1.5×10⁻¹²≤ 2×10⁻¹²≤ 2.5×10⁻¹¹≤ 1×10⁻¹¹≤2×10-¹³≤2×10-¹³
100s <3E-13<5E-13<5E-12≤7E-14≤ 5×10⁻¹³≤ 6×10⁻¹³≤ 8×10⁻¹²≤ 3×10⁻¹²≤4×10⁻¹³≤5×10-¹³
Day (GNSS Lock) <1E-12<1E-12<1E-12≤3E-14——————
Phase noise1Hz ≤-95dBc/Hz≤-95dBc/Hz≤ -100 dBc/Hz≤-120dBc/Hz≤ -95 dBc/Hz≤ -85 dBc/Hz≤ -50 dBc/Hz≤ -85 dBc/Hz≤ -123-126*
10Hz ≤-130dBc/Hz≤-130dBc/Hz≤-130dBc/Hz≤-140dBc/Hz≤ -130 dBc/Hz≤ -120 dBc/Hz≤ -80 dBc/Hz≤ -120 dBc/Hz≤ -145 ≤ -148
100Hz ≤-145dBc/Hz≤-145dBc/Hz≤-145dBc/Hz≤-155dBc/Hz≤ -150dBc/Hz≤ -145dBc/Hz≤ -115 dBc/Hz≤ -140dBc/Hz≤ -155 ≤ -155
1kHz ≤-155dBc/Hz≤-155dBc/Hz≤-160dBc/Hz≤-160dBc/Hz≤ -160dBc/Hz≤ -150dBc/Hz≤ -130 dBc/Hz≤ -140dBc/Hz≤ -160 ≤ -160
10kHz ≤-158dBc/Hz≤-158dBc/Hz≤-160dBc/Hz≤-160dBc/Hz≤ -160dBc/Hz≤ -155dBc/Hz≤ -140dBc/Hz≤ -145dBc/Hz≤ -165 ≤ -163
distortionHarmonic ≤-45dBc≤-45dBc≤-45dBc—≤ -30dBc≤ -30dBc—≤ -80dBc≤ -40dBc≤ -40dBc
Non-harmonic ≤-80dBc≤-80dBc≤-80dBc—≤ -80dBc≤ -70dBc——≤ -80dBc≤ -80dBc
Pulse outputNumber of way 4 4 4 4 1111——
Synchronization accuracy 20ns20ns20ns10ns——————
Frequency drift rate/day ————±5×10⁻¹³±1×10⁻¹²≤3×10-¹¹¹±3×10⁻¹²≤3×10-¹⁰≤1×10-¹⁰
Physical and Electrical CharacteristicsWorking temperature -10℃~+55℃-10℃~+55℃-10℃~+55℃-10℃~+55℃-40℃~+65℃-40℃~+65℃-40℃~+85℃-40℃~+75℃ -20℃~+70℃0℃~+40℃
Cunjian Temperature -45℃~+85℃-45℃~+85℃-45°C to +75°C-55°C to +85°C-40℃~+85℃-40℃~+85℃-55℃~+125℃-55℃~+100℃-40℃~+85℃-55℃~+125℃
power supply 220V±20%220V±20%220V±20%220V±20%+12V to +15V or +24V+12V–+15V, ±41 TP3T +3.3V±5% +5V±4%+12VDC+14 to +125°C
Rate of work 50W60W60W70W warm-up, steady-state ≤ 30WWarm-up ≤ 45 W, steady-state ≤ 15 WStart-up power ≤ 28.5 W, steady-state power ≤ 14.5 WWarm-up ≤ 10 W, steady-state ≤ 1.8 WWarm-up ≤ 15 W, steady-state ≤ 8 W≤7.2 W≤27 W
External Dimension 2U half-width2U2U2U116mm×79mm×38mm68mm×68mm×18mm 41mm×36mm×17mm51mm×51mm×18mm50mm×50mm×19mm5 inches × 3 inches × 3 inches
Weight 2Kg5 kg3.5 kg5 kg≤500g≤300 g≤50 g<100g——
Well-behaved and punctualAfter 24h of synchronization 200 ns200 ns10 us30 ns (20 days after synchronization)≤1 µs after 24 hours of synchronization≤1 us—≤1 us——

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