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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 Plus Full-Featured GPS Time & Frequency Unit with Front Panel Keypad and Display
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
  • Front panel keypad and Display


The GPS8 Plus is a multi-output precision time and frequency standard that uses the Global Positioning System (GPS) to steer and hold an internal oscillator and clock system precisely on time. It is designed for use in telecommunications, power utility, and military communication applications. Time and frequency information is maintained to high accuracy by the internal oscillator even if no satellites can be tracked. Available oscillator options include Rubidium, OCXO, or TCXO.

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