The Model 3650 GPS Synchronized Time Code Generator provides the user with the normal selection of generator outputs; time codes, pulse rates, sine waves, parallel data and computer compatible outputs such as IEEE 488 and RS232C. Its main feature, however is that it automatically synchronizes to universal time via the Navstar Global Positioning System (GPS). The Model 3650 houses a GPS Receiver and is furnished with an antenna and interconnecting cable. The unit operates on the Civilian L Band, C/A code transmitted by the Navstar Satellites. While the Model 3650 is designed primarily for timing applications, and requires only one satellite to be in view to perform this function, it will also provide precise position information. Four satellites in view are required to determine the precise location of the receiver. With a satellite in view, the Model 3650 correlates to Coordinated Universal Time (UTC) to better than 100 nanoseconds. During this period it also disciplines its internal oscillator so as to achieve optimum correlation Programming of the unit is accomplished through its front panel keypad. An associated alphanumeric LCD display indicates such functions as programmed data, calculated position and satellite health. A second display, · · · · · · time@datachroninc.comwww.datachroninc.com Fax: (714) 491-8213(714) 491-8500 Anaheim, CA 928051333 South Lewis Street The Model 3650 is available in both desktop and rack mounting configurations. comprised of high intensity LED’s, continuously indicates time of year information. with UTC during those periods when satellite transmissions are not available. TIME CODE GENERATOR GPS SYNCHRONIZED MODEL 3650 SPECIFICATIONS The Model 3650 accumulates time from an internal oven controlled crystalGenerated time is continuously displayed by nine front panel mounted LED’s oscillator. When satellites are in view, this oscillator is disciplined to keep it inwith 1.0 inch character height. phase and frequency correlation to UTC. Specifications for the oscillator in a free running, undisciplined form are: The following functions are programmable or readable via a front panel keyboard -9 ±1 x 10from 0 to +50 °C in conjunction with a 16 digit alphanumeric LCD display. -10 Aging Rate:1 x 10 Set Cable Delay Set Elevation Angle Mask Set GMT Offset Set Network Parameters When at least one satellite is in view the Model 3650 synchronizes to Universal Read GPS/UTC Difference Time in both real time and frequency. During these periods of GPS signal Read Oscillator Control Status availability, the unit also disciplines its internal oscillator. The result is better Read Position than 100 nanosecond correlation to UTC with satellite signals present and Read Receiver Status better than 5 microsecond correlation during periods of signal absence. Read Satellite Status Once the antenna is installed and the unit turned on no further operator interaction with the Model 3650 is required. Synchronization is automatic. The Model 3650 operates from a primary power source of 115 volts AC ±10%, 50 to 70 Hz and consumes less than 30 watts of power. In the event of primary power failure, internal batteries maintain keyboard programmed functions and The basic Model 3650 provides the following outputs: GPS Receiver acquired information for over one year. Amplitude:Adjustable from 0 to 6 volts peak to peak ChassisAntenna Modulation Ratio:Adjustable from 2:1 to 6:1 Maximum External Load:50 ohms Temperature:Operating:0°C to +50°C-20°C to +95°C Storage:-40°C to +100°C-40°C to +100°C Humidity:0 to 95%,0 to 100%, Without condensation A 1PPS pulse rate, synchronous with UTC, is provided at a rear panel BNC connector. The Model 3650 is designed for either desk (bench) top or rack mounting. On Time Point:Positive going edge Duty Cycle:80 percent In its desktop configuration the Model 3650 has the following dimensions: Amplitude:Positive going pulses from a maximum 0.4 volt baseline to +4.5 volts, minimum Height:1.75 or 3.5 inches (4.4 or 8.9 cm) Rise and Fall Times:15 nanoseconds Width:Chassis:17 inches (43.2 cm) Drive Capability:10 LSTTL unit loads Depth:12.5 inches (31.8 cm), not including rear panel connectors 10 pounds, (4.5 kg), nominal Ears can be added to the desktop chassis to make it rack mountable. Or, for units Other available outputs and control inputs are listed below. Detailed requiring extensive option capacity, an extended rack mount chassis can be specifications for these options are available upon request. furnished, with the following dimensions: Parallel BCD (tenths of milliseconds through days)Height:1.75, 3.5 or 5.25 inches (4.4, 8.9 or 13.3 cm) Parallel Binary (several ranges and resolutions available) Width:Chassis:17 inches (43.2 cm) Computer Interfaces Front Panel:19 inches (48.3 cm) IEEE 488 In/Out Depth:19.5 inches (49.5 cm), not including rear panel connectors RS232C In/Out 20 pounds (9.1 kg), nominal Pulse Rates Sine Waves To assist in equipment maintenance all integrated circuits are mounted in sockets. Modem Rates Other Time Codes:IRIG A, E, G, H NASA 36 Bit XR3/2137 Each unit is delivered with an operation and maintenance manual which includes a complete description of the unit’s theory of operation along with all assembly and schematic drawings. Documentation Weight: Optional Outputs Weight: Physical Characteristics 1PPS Pulse Rate Environmental Characteristics IRIG B Serial Time Code Outputs Power Requirements Synchronization per day Stability: Programmable Functions Frequency Standard Display