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The GPS8 is a staple of Brandywine being a reliable, low cost Time and Frequency instrument offering a wide range of standard features in a compact, 1U rack-mount chassis. Precision time and frequency output, accurate to 40 nano-seconds to UTC/USNO and 1x10-12 respectively, are provided in a variety of signal formats. Applications for the GPS8 include central time and frequency systems, timing for power utility systems, and frequency standards for a wide variety of communication installations.
Low cost, full-featured GPS Time & Frequency unit
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GPS synchronization
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Choice of disciplined oscillator
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Time code outputs
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Two serial ports
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Low phase noise 1, 5, 10 MHz sine waves available
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T1, E1, 10.6608MHz available
- 12 Channel Receiver
| 1 PPS Output |
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Connector |
BNC |
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Amplitude & Impedance |
0, +5Vdc from 50 Ohms |
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On Time |
Rising Edge |
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Duty Cycle |
50% |
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| Serial Interface |
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Number of Ports |
2 |
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Connector |
DB9 |
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Type |
RS-232 and/or RS-4221 |
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Baud Rate |
50-19, 2001 |
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| Sine Wave Outputs1 |
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Number of outputs |
Two pairs of 2 |
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Connector |
BNC |
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Frequency (MHz) |
1, 5, 102 (select when ordering) |
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Level |
1 Vrms into 50 Ohms |
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Isolation |
Transformer |
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| Time Code Output, Modulated Carrier1 |
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Number of Outputs |
1 |
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Code Format |
IRIG B, 2137, NASA 361 |
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Level |
3Vpp into 600 Ohms |
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| Digital Time Code & Pulse Rates1 |
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Outputs1 |
IRIG B, 1PPM, 1PPD, Programmable Rate |
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Levels |
DC level shift (HCMOS Logic Level) |
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| Telecom Outputs1 |
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Frequency |
2.048,1.544 or 19.6608 MHz, 2 ea 2 |
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Output |
G703 Section 6 2.37V pulse into 75 Ohms |
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or 3V pulse into 120 Ohms |
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Frame Rate |
8 kPPS, 0v and+5v from 75 Ohms |
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| Summary Alarm |
Voltage free relay changeover contacts & |
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TTL level, positive or negative1 |
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| Environmental-Physical-Power |
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| Temperature |
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Instrument |
0 to + 50°C |
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Antenna |
-40 to +85°C |
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| Humidity |
To 95% non-condensing |
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| Power |
95-260 Vac, 19 W warm, 30 W cold 3 |
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Optional Power |
18-36 Vdc, 36-72 Vdc, -48Vdc |
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| Dimensions |
19 inch Rack Mount, 1.73 inches high (1U) |
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15.80 inches depth |
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| Weight |
11lb typical |
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| EMC Emission |
To EN50081-1 as EN55022 |
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| EMC Immunity |
To EN50082-1 as EN1000-4-2 ESD, |
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IEC 801-3 HF Field, IEC 801-4 Burst |
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| MTBF |
159,769 Hours per Mil 217F, Notice 2, |
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25 degrees C, ground benign |
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| GPS Specifications |
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Satellite Signal |
GPS L1 1575.42 MHz |
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Satellite Code |
C/A 1.023 MHz |
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Receiver Type |
Parallel 8 Channel, 8 Satellites tracked |
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continuously and simultaneously |
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| Position Accuracy |
2.4 m horizontal, 5 m altitude with |
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respect to WGS-84 after 24 hours of |
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position averaging |
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Warm start |
<20 seconds |
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Autonomous Start |
<120 seconds |
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Cold Start, Automatic |
No input of time or position is required |
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| Antenna & 100' cable |
Included at no extra cost. |
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Dynamic Operation |
Specify Dynamic Mode at time of order2 |
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Timing Accuracy |
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Tracking satellites |
±150 nS. absolute to UTC* |
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Std Deviation 34 nS (Osc.-03) |
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Hourly mean 25 nS (Osc.-03) |
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Holdover Mode |
<8 µsec/day (Osc.-03), |
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1 µsec/day (Osc.-04) |
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GPS-8