This product has been discontinued.  For its replacement, see NFS-220 Network Ready GPS Time and Frequency Standard

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


  • 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

Product Specifications
Product Data Sheet
User Manual

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 ea 2      
  Output G703 Section 6 2.37V 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 cold 3      
  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 L1 1575.42 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    
  Autonomous Start    
  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    
  1 µsec/day (Osc.-04)  

alt GPS-8 Data Sheet

alt GPS-8 User Manual



About Brandywine Communications

Brandywine Communications Inc. offers superior products to the time and frequency marketplace. Our mission is to provide the finest equipment coupled with excellent before and after sale service.

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Brandywine Communications
Ultra-Precision Time & Frequency

1153 Warner Ave
Tustin, CA 92780
Phone: +1 (714) 755-1050