rscggoxxy - rf-suisse · ublox (gpsu models): blox.com . (model lea6t). they also provide a control...
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an INWAVE AG brand
RSCGGOxxyConnectorized RSGGO based frequency reference
The RSCGGO is a small and self contained GPS guided frequency reference for mobile and desktop use. It contains our RSGGO10T (TCXO) or RSGGO10O (OCXO) circuits, a GPS receiver, RS232 level converter and voltage regulators. The output is buffered to enable driving a 50Ω load.For a high performance TCXO model with 2 ground free outputs please see the RSMRGGT datasheet.The RSCGGO are true disciplined crystal oscillator and as such they provide extremely low phase noise with no phase discontinuity or jumps or spurious as can be observed with other solutions!As the GPS signal is NIST traceable all RFSUISSE frequency references with GPS guidance are NIST traceable too and as such do not need calibration. As long as a GPS signal is applied they act as secondary standards.
Front view (OxxxBNC) Front view (OxxxVL) Rear view (OPPFxxx) Rear view (T)
Benefits and Features:
● small complete GPS guided (disciplined) oscillator in an aluminium enclosure.
● Ideal for desktop and mobile references (T)
● available in a TCXO or OCXO based version
● Available with integrated GPS receiver or electrical or optical 1PPS input
● low power consumption
● RS232 interface to read NMEA messages (GPS only)
● RSCGGO10O: 1PPS GPS synchronized continuous output
● RSCGGO10T: 1PPS output of GPS RX, discontinued on loss of GPS reception
● RSCGGO10O: available with BNC or optical RF output (Versatile Link)
The RSCGGO is supplied without an antenna which has to be user provided. Any 3.3V/<50mA active antenna can be used. Recommended: RSGPSANTxx series.
Once an antenna and a 812VDC (815.6V for T) power supply are connected the RSCGGOxx is ready to go. DO NOT operate the O version with more than 12VDC as it may internally overheat! The T version can withstand operation from a vehicle source with its specified range of up to 15.6VDC.
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Initially the LED will be red until a stable 1PPS signal is detected. Then it will turn amber (yellow) during acquisition and finally it will turn green once full lock is achieved.
The GPS module can be controlled and data can be retrieved via a standard RS232 interface (4800Bd, 8N1). A command list for the GPS modules can be downloaded from the module manufacturers websites:Linx (GPSL models): http://www.linxtechnologies.com (model RXMGPSSG).ublox (GPSU models): http://www.ublox.com . (model LEA6T). They also provide a control software for the USB port.
Available models:RSCGGO10T 10MHz output frequency, TCXO based
other frequencies available on request, see list in the RSGGOxxT datasheet.RSCGGO10OPPFBNC 10MHz output frequency, OCXO based, 1PPS optical input, BNC RF outputRSCGGO10OGPSUBNC 10MHz output frequency, OCXO based, internal ublox timing GPS receiver, BNC RF outputRSCGGO10OPPFVL 10MHz output frequency, OCXO based, 1PPS optical input, optical VersaLink outputRSCGGO10OGPSUVL 10MHz output frequency, OCXO based, internal ublox timing GPS receiver, optical
VersaLink outputRSCGGO10OPPFBNCKIT complete system consisting of RSCGGOOPPFBNC, RSGPSPPS4 and
RSGPSANT70H. Plastic fibre has to be customer sourced.
Special order models:RSCGGO10OGPSLBNC 10MHz output frequency, OCXO based, internal Linx GPS receiver, BNC RF outputRSCGGO10OGPSLVL 10MHz output frequency, OCXO based, internal Linx GPS receiver, optical VersaLink output
In stark contrast to PLL based solutions the RSCGGO10 is highly immune to drops in GPS signal, missing 1PPS pulses or pulse distortions caused by fading or other influences.One can test this behaviour by disconnecting the antenna for a while and the output signal will just drift with the temperature stability and ageing of the oscillator. After reconnecting the GPS signal the RSCGGO10 doesn't show the large swings common to PLL circuits but will move back onto locked frequency almost unnoticeable.
The optical 1PPS input devices are intended for applications where lightning and EMI protection is crucial. The GPS receiver with optical 1PPS output (RSGPSPPS4) and the antenna can be installed over/inside the roof and only a plastic fibre will go into the building assuming that the mains supply for the GPS receiver is protected or done by battery and solar cell charger.
Installation
Installing the RSCGGOxxy requires that some precautions are observed! Due to the extreme improvement of the regular crystal oscillator performance the unit has to be securely mounted to a wall or other sturdy and fixed objects. The chosen location should be away from vibrations, airflow with changing temperatures and the connections should always be left in place to avoid disturbance of the oscillator signal.Especially for the OCXO based model an UPS is highly recommended as even very short interruptions of the supply voltage will have the unit start acquisition again which can take some time. This is less of a concern with the TCXO based version as the lock time is pretty short.
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RSCGGO10 Specifications
Reference, T version:Frequency: 10MHz, (20MHz TCXO) other frequencies available on requestPhase noise (typ): 98 dBc/Hz typ. @ 10Hz offset
122 dBc/Hz typ. @ 100Hz offset138 dBc/Hz typ. @ 1KHz offset150 dBc/Hz typ. @ 10KHz offset160 dBc typ. noise floor
Temperature range: 30 to +80C (operating)Stability: < 5x10E9, typical 5x10E10 = 0.5ppb (GPS locked)
+/ 2.5ppm (free running)Aging: compensated (GPS locked)
+/ 50ppb per year (free running) after continuous operating for 30 days
Reference, O version:Frequency: 10MHz (OCXO)Phase noise (typ): 126 dBc/Hz typ. @ 10Hz offset
141 dBc/Hz typ. @ 100Hz offset148 dBc/Hz typ. @ 1KHz offset152 dBc/Hz typ. @ 10KHz offset153 dBc/Hz typ. @ 100KHz offset161 dBc typ. noise floor
Temperature range: 30 to +70C (operating)Stability: < 1x10E10, typical <1x10E11 (GPS locked)Holdover: Stratum 3 for entire temperature range
Stratum 3E if temperature after GPS loss is kept within +/5C+/ 50ppb (free running)
Ageing: compensated (GPS locked)+/ 1ppm per year (free running)
Interfaces and supplies:Antenna type (GPS): active antennaActive Antenna Supply (GPS): 3.3V, 50mA (max)Antenna connector (GPS): SMA femaleAntenna recommendation (GPS): Gain 1550dB, NF <=1.5dB (active antenna)RF output: BNC female connector. +4dBm (min) into 50ΩRF output (VL): HP Versatile Link style optical output Harmonic suppression: >30dB1PPS output (T only): 3V CMOS, 2.5mm 3pin connector. Tip= +5V, ring= 1PPS, case= GND, positive 1μsec pulse
width. Discontinued on loss of GPS signal.1PPS output (O only): 5V CMOS, 2.5mm 3pin connector. Tip= +5V, ring= 1PPS, case= GND, positive pulse with
50% duty cycle. SMB connector for PPF model. The pulse is synchronized to the average of the GPS signal. Will continue to operate with the OCXO accuracy in case of loss of GPS signal.
1PPS input (PPF only): 1.0/2.2mm plastic fibre “connectorless” input
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GPSRS232: standard level RS232, 3.5mm 3pin connector. Tip = TXD, ring = RXD, case = GND *)
Power supply: 815.6VDC/80mApeak (T), 812VDC/650mApeak (O)Power connector: 2.1mm coaxial power connector, centre positive.Enclosure: anodized thick wall aluminium, 84x55x28mm (w/o connectors and flange)
Accessories (included):Wall power supply 90 to 240VAC with coaxial power connector. Mains plug depending on region.
Accessories (optional):Active GPS antenna for models with integrated GPS a variety of GPS antennas is available for window, desktop/wall or
exterior installation. Please see the RSGPSANTxx models for further information.GPS receiver for models with optical 1PPS input: RSGPSPPS4RS232 cable: RSD9FA3.5, Dsub 9pin female to 3.5mm coaxial connector.
Linx GPS receiver (GPSL models):Receiver type : 20 Channels; GPS L1 frequency, C/A CodeTimeToFirstFix: Cold Start (Autonomous): 35s
Hot Start (outdoor): 2sHot Start (indoor): 15s
Sensitivity: Tracking & Navigation: 159 dBmCold Start (Autonomous): 144 dBm
Horizontal position accuracy: Autonomous: < 10 m SBAS: < 5 m
Time Pulse: 1Hz, 1µs width positive pulse, 1µs accuracy to GPS time pulseMax navigation update rate: 1HzOperational limits: Altitude 60000ft
Velocity 1000 knotsOperating temperature range: 30C to +85C
ublox GPS receiver (GPSU models):Receiver type : 50 Channels; GPS L1 frequency, C/A Code;
GALILEO Open Service L1 frequency TimeToFirstFix1 : Cold Start (Autonomous): 29s
Hot Start (Autonomous): 29sWarm Start (Autonomous): <1sAided Starts2 : <1 s
Sensitivity3 : Tracking & Navigation: 160 dBmReacquisition: 160 dBmCold Start (Autonomous): 144 dBm
Horizontal position accuracy4 : Autonomous: < 2.5 m SBAS: < 2.0 m
Accuracy of Timepulse signal: RMS: 30ns
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99%: <60 nsCompensated: 15 ns3,
Time Pulse: Configurable f = 0.25 … 999 Hz (Tp = 1/f – 1ms)Max navigation update rate: <2HzVelocity accuracy6 : 0.1m/sHeading accuracy7 : 0.5 degreesDynamics: <=4gOperational limits8 : Altitude 50000m
Velocity 500m/s
1 All satellites at 130 dBm 2 Dependent on aiding data connection speed and latency 3 Demonstrated with a good active antenna 4 CEP, 50%, 24 hours static, 130dBm, SEP: <3.5m 5 Quantization error information can be used to compensate the granularity related error of the time pulse signal. 6 50% @ 30 m/s 7 50% @ 30 m/s 8 Assuming Airborne <4g platform
Absolute maximum ratings:Supply voltage: 0.5VDC/+15VDC (T model 15.6V)Output DC voltage: +/ 20V1PPS output (T): no DC voltage, 1mA max.1PPS output (O): no DC voltage, 20mA max.1PPS input: 0.3V/+5.5VRS232: ESD max 15kV, RXD +/30V, TXD 0.3V/5V
*) Remark: Some terminal programs require additional connections which have to be made externally: pin 1+4+6 and pin 7+8 have to be connected.
Differences between Linx and ublox GPS receiver (GPSL and GPSU models):The Linx module is a general purpose GPS receiver module and as such does what it is supposed to do. If good GPS reception can be guaranteed no difference will be seen in the stability. The ublox module is a dedicated timing receiver which locks faster and can hold an accurate timing signal even with the reception of one satellite only once initial lock with multiple satellites had been achieved. It also has a lot less jitter on its 1PPS pulse which makes the resulting control of the OCXO a lot more stable. The receiver is also less prone to signal interruption due to interference or changes in field strength of the GPS signal.
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Dimensions
Dimensions in mm
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Typical performance data for RSCGGO10T
Phase noise at 10MHz output frequency (typ):
Allan Variance, GPS locked:
Tau = average TimeADEV = Overlapping ALLAN STD DEV.ADEV_Min = ADEV lower bound.ADEV_Max = ADEV upper bound.MDEV = Modified ALLAN STD DEV.TDEV = Time ALLAN STD DEV.HDEV = Overlapping HADAMARD STD DEV.
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ADEVMDEVTDEVHDEVLower BoundUpper Bound
AlaVar 5.2Allan STD DEV
Produced by AlaVar 5.2
τ 10 100 1000
σ(τ)
1E-10
1E-9
1E-8
1E-7
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Long term stability:
0 2000 4000 6000 8000 10000 12000 14000 16000
-2.0E-09
-1.5E-09
-1.0E-09
-5.0E-10
0.0E+00
5.0E-10
1.0E-09
1.5E-09
2.0E-09
TCXO locked, very quiet environment
Time (s)
Fre
qu
ency
Dev
iati
on
Cold start lockin:
0 200 400 600 800 1000
-1.0E-08
-8.0E-09
-6.0E-09
-4.0E-09
-2.0E-09
0.0E+00
2.0E-09
4.0E-09
6.0E-09
8.0E-09
1.0E-08
TCXO cold start
Time (s)
Fre
qu
en
cy
De
via
tio
n
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Missing 1PPS recovery:
0 2000 4000 6000 8000 10000 12000 14000
-5.0E-09
-4.0E-09
-3.0E-09
-2.0E-09
-1.0E-09
0.0E+00
1.0E-09
2.0E-09
3.0E-09
4.0E-09
5.0E-09
TCXO 1PPS interrupted (1633-1695sec and 3100-4340sec)
Time (s)
Fre
qu
ency
Dev
iati
on
Typical performance data for RSCGGO10OPhase noise:
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Allan Variance, GPS locked:
Tau = average TimeADEV = Overlapping ALLAN STD DEV.ADEV_Min = ADEV lower bound.ADEV_Max = ADEV upper bound.MDEV = Modified ALLAN STD DEV.TDEV = Time ALLAN STD DEV.HDEV = Overlapping HADAMARD STD DEV.
Long term stability:
0 5000 10000 15000 20000 25000 30000 35000 40000
-2.0E-10
-1.5E-10
-1.0E-10
-5.0E-11
-2.6E-26
5.0E-11
1.0E-10
1.5E-10
2.0E-10
OCXO locked, quiet environment
Time (s)
Fre
qu
ency
Dev
iati
on
Page 10 of 12© 2012, INWAVE AG, Dorf 23, CH9411 Reute, SwitzerlandQuality Made in Switzerland Rev. 2.3, 20.12.2012
ADEVMDEVTDEVHDEVLower BoundUpper Bound
AlaVar 5.2Allan STD DEV
Produced by AlaVar 5.2
τ 10 100 1000
σ(τ)
1E-12
1E-11
1E-10
1E-9
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Cold start lock-in:
0 200 400 600 800 1000 1200 1400 1600 1800
-2.0E-08
-1.5E-08
-1.0E-08
-5.0E-09
0.0E+00
5.0E-09
1.0E-08
1.5E-08
2.0E-08
OCXO cold start
Time (s)
Fre
qu
ency
Dev
iati
on
Missing 1PPS recovery:
0 200 400 600 800 1000 1200 1400 1600 1800
-2.0E-10
-1.5E-10
-1.0E-10
-5.0E-11
-2.6E-26
5.0E-11
1.0E-10
1.5E-10
2.0E-10
OCXO 1PPS interrupted (800 - 845sec)
Time (s)
Fre
qu
ency
Dev
iati
on
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0 2000 4000 6000 8000 10000
-2.0E-10
-1.5E-10
-1.0E-10
-5.0E-11
-2.6E-26
5.0E-11
1.0E-10
1.5E-10
2.0E-10
OCXO 1PPS interrupted (800 - 4200sec)
Time (s)
Fre
qu
ency
Dev
iati
on
All RFSUISSE product comply with RoHS requirements current at the date of manufacturing.
As we continuously improve our product we reserve the right to change published specifications without further notice. Please see our website at http://www.rfsuisse.ch for current information.
All product manufactured and sold by INWAVE AG under the RFSUISSE brand is intended for laboratory use or are components (modules) not suitable for consumer use. Thus they are not required to and do not carry CE certification.
Inquiries, quote requests and questions: please email to info@rfsuisse.ch or your INWAVE AG / RFSUISSE representative. For technical questions please email to tech@rfsuisse.ch
RFSUISSE is a registered trademark of INWAVE AG, Reute, Switzerland
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