Timing Reference Unit
The TRU is a state of the art, high-precision time/frequency standard capable of outputting five isolated IRIG Time of Day and 1PPS reference outputs. The TRU uses an internal GPS receiver to control a precision oscillator with accuracy up to 1 x 10-12 and excellent short term stability.
The TRU incorporates a high-sensitivity 12 channel SAASM GPS receiver, incorporating the latest advances in GPS anti-spoofing technology.
Dual Ethernet ports are used for both monitoring/control of the FRU using Simple Network Monitoring Protocol (SNMP) as well as providing Network Time Protocol (NTP) to clients.
A Brandywine supplied user application may also be used to provide a Graphical User Interface to the TRU.
The TRU is available is a number of configurations to support specific applications. A
Mobile Application version features a special vibration isolated oscillator that provides isolation of the reference source from portable generator induced phase noise. The High Performance version uses a rubidium oscillator.
A C/A code GPS receiver is available for non-military applications.
- Ultra-stable GPS Disciplined Timing Reference
- 5 buffered IRIG outputs
- 5 buffered 1PPS outputs
- 10MHz frequency reference out
- 1U chassis
- Timing accuracy to 1 x 10-12
- Dual Port NTP Server
- Ultra-stable GPS Disciplined Frequency Reference
- 10 Independent 10MHz outputs
- 1U chassis
- Meets MIL-STD-188-164A stability requirements
- Frequency accuracy to 1 x 10-12
- Dual Port NTP Server
- Flight Qualified
- Support for IEEE-1588 and GPS Havequick II I/O
- Input IEEE-1588 and Convert to IRIG A/B
- Tested to MIL-STD 810F and 461E CE102 and RE 102
|Time Code Source||IRIG and GPS Have Quick II time code generator
NTP Server and IEEE-1588 Master options
|Time Mark Output||UTC / GPS|
|Jam Sync||Jam-sync to IRIG-B, GPS HQ, GPS receiver|
|Power||9 to 36 V DC, 1.5 W|
|Power Backup||Internal clock backed up by Super-Cap|
|USB Interface||Configuration using a PC|
|Time Offset||+/-12 hours with 1 second resolution|
|Digitial I/O||5 configurable digital input output pins|
|GPS Reciever [option]||16 channel internal GPS receiver with external active antenna|
|GPS Lock Indicator||GPS lock output|
|Galileo||Galileo capable with firmware upgrade|
|RS-232 Port||NMEA time & location message output (with GPS receiver)|
Brandywine's Portable Timing Unit (PTU) is a 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 including SAASM GPS, or by a serial time code such as IRIG B or Have Quick. Outputs include: NTP, IRIG A, IRIG B, IRIG G, Have Quick, and 1PPS. A range of options are available for the oscillator which include: Rubidium, OCXO, or TCXO. Built in a rugged, weather-proof case the PTU is easily transportable to any location and can be used in all weather conditions to give precise Time and Frequency.
Brandywine launched a press release on this new product. Please go to our PTU Press Release to see more details about this product.
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.
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
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.
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
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.
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.
The PTU is housed in a sturdy weatherproof enclosure that is suitable for outdoor use in all weather conditions.