PTU
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Network Ready Portable Timing Unit Model PTU Model PTU Portable Time Unit – SPS C/A code version The Portable Timing Unit (PTU) is low cost, battery operated, transportable timing system that is designed to provide precise time of day at point of use. The PTU may be automatically synchronized by means of either GPS signals, or an serial time code such as IRIG B or Have Quick. Operation of the unit can be monitored via an Ethernet interface, or by means of front panel indicators and displays. Outputs are 1PPS, Have Quick, IRIG B Time Code and Network Time Protocol (NTP). The unit is mounted in a rugged, weather proof case that may be easily transported to the point of use. When AC power is available, the PTU’s built-in power supply will automatically charge the internal batteries. Reference Input Sources The PTU is extremely flexible in its ability to synchronize to a variety of timing sources. Available references are: 16 channel GPS SPS receiver (standard) 12 channel GB-GRAM SAASM GPS receiver (optional) IRIG B Time Code (standard) HaveQuick/1PPS from external GPS receiver (standard) Once synchronized to the selected reference, the PTU will use the reference to continuously calibrate its internal oscillator so that accurate time can be maintained in the absence the reference. Front panel LEDs indicate the reference type in use, and whether time is valid. The PTU can be configured to always use a particular reference source, or automatically select whatever source is available. Time Keeping The internal time of the PTU is maintained by a high precision oscillator. Selection of the oscillator type will determine the accuracy of the PTU when its reference, (such as GPS) is not available. Available internal oscillator options are Temperature Compensated Crystal Oscillator (TCXO) -option Oven Controlled Crystal Oscillator (OCXO) standard Atomic Rubidium Oscillator - option Network Interface The PTU incorporates an Ethernet connection that provides a convenient means of monitoring status of the instrument via a computer and simple web browser. This interface is also used to provide NTP synchronization, firmware updates and Browser based setup features. Output Signals The PTU provides a variety of timing signal outputs, giving maximum application flexibility 1PPS 1 Pulse Per Second Signal Time Mark Have Quick Time Code IRIG B Time Code NTP Internal Battery Backup The PTU contains an internal 7Ah battery that will operate the system in the event prime power is lost. The battery charge is monitored and maintained whenever prime power is applied to the PTU. Status is indicated by front panel LED’s. Battery life is dependent upon the oscillator configuration selected and the ambient temperature, but 5 hours is typical for the OCXO version. Time Display An 11 digit display indicates Years, Days, Hours, Minutes and Seconds. The illumination of the display is controlled by a front panel switch to conserve battery life. External Event Input The PTU includes an external event input that will latch the time of external events applied as pulses to this input. The time tags are stored in an internal memory and may be displayed and retrieved using the network interface. Weatherproof Enclosure The PTU is housed in a sturdy weatherproof enclosure that is suitable for outdoor use in all weather conditions. Typical Portable Timing Unit Applications Flight Test Military Test Ranges Portable Standby Clock Aircraft Mission System Hot Start Communications System Hot Start 1153 Warner Avenue . Tustin . CA . 92780 . USA (714) 755 1050 . (714) 755 0175 (FAX) . www.brandywinecomm.com

PTU SPECIFICATIONS Satellite Signal Satellite Code Receiver Type Warm Start Autonomous Start Cold Start Requirement Position Accuracy Timing Accuracy (tracking satellites) Timing Accuracy (holdover mode, ± 5ºC) 1PPS Output Connector Level On Time Network Interface Interface Type Protocols Serial Interface Type Baud rate Content IRIG Time Code Output Connector Code Type Control Functions Level Have Quick Output Connector Code Type Levels Alarm Status Status Indicator LED’s 1PPS Input Connector Level Impedance Have Quick Input Connector Code Type GPS L1 1575.42 MHz C/A 1.023 MHz Parallel 16...