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350 MHz - 2 GHz
2.5 GHz - 10 GHz
11 GHz - 100 GHz
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Timing & Frequency

Brandywine GPS-8 Low Cost, Full-Featured GPS Time & Frequency Unit
Product Overview
  • GPS synchronization
  • Choice of disciplined oscillator
  • Time code outputs
  • Two serial ports
  • Low phase noise 1, 5, 10 MHz sine waves available
  • T1, E1, 10.6608MHz available
  • 12 Channel Receiver


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.

Specifications & Detail

1 PPS Output
Connector BNC
Amplitude & Impedance 0, +5Vdc from 50 Ohms
On Time Rising Edge
Duty Cycle 50%
Serial Interface
Number of Ports 2
Connector DB9
Type RS-232 and/or RS-4221
Baud Rate 50-19, 2001
Sine Wave Outputs1
Number of outputs Two pairs of 2
Connector BNC
Frequency (MHz) 1, 5, 102(select when ordering)
Level 1 Vrms into 50 Ohms
Isolation Transformer
Time Code Output, Modulated Carrier1
Number of Outputs 1
Code Format IRIG B, 2137, NASA 361
Level 3Vpp into 600 Ohms
Digital Time Code & Pulse Rates1
Outputs1 IRIG B, 1PPM, 1PPD, Programmable Rate
Levels DC level shift (HCMOS Logic Level)
Telecom Outputs1
Frequency 2.048,1.544 or 19.6608 MHz, 2 ea2
Output G703 Section 62.37V pulse into 75 Ohms
or 3V pulse into 120 Ohms
Frame Rate 8 kPPS, 0v and+5v from 75 Ohms
Summary Alarm Voltage free relay changeover contacts &
TTL level, positive or negative1
Instrument 0 to + 50°C
Antenna -40 to +85°C
Humidity To 95% non-condensing
Power 95-260 Vac, 19 W warm, 30 W cold3
Optional Power 18-36 Vdc, 36-72 Vdc, -48Vdc
Dimensions 19 inch Rack Mount, 1.73 inches high (1U)
15.80 inches depth
Weight 11lb typical
EMC Emission To EN50081-1 as EN55022
EMC Immunity To EN50082-1 as EN1000-4-2 ESD,
IEC 801-3 HF Field, IEC 801-4 Burst
MTBF 159,769 Hours per Mil 217F, Notice 2,
25 degrees C, ground benign
GPS Specifications
Satellite Signal GPS L11575.42 MHz
Satellite Code C/A 1.023 MHz
Receiver Type Parallel 8 Channel, 8 Satellites tracked
continuously and simultaneously
Position Accuracy 2.4 m horizontal, 5 m altitude with
respect to WGS-84 after 24 hours of
position averaging
Warm start <20 seconds
Autonomous Start <120 seconds
Cold Start, Automatic No input of time or position is required
Antenna & 100' cable Included at no extra cost.
Dynamic Operation Specify Dynamic Mode at time of order2
Timing Accuracy
Tracking satellites ±150 nS. absolute to UTC*
Std Deviation 34 nS (Osc.-03)
Hourly mean 25 nS (Osc.-03)
Holdover Mode <8 µsec/day (Osc.-03),
1 µsec/day (Osc.-04)

Data Sheet & Downloads