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16 channel GPS SPS receiver (standard)
IRIG B Time Code (standard)
HaveQuick/1PPS from external GPS receiver (standard)
Temperature Compensated Crystal Oscillator (TCXO) – option
Oven Controlled Crystal Oscillator (OCXO) standard
Atomic Rubidium Oscillator – option
1PPS 1 Pulse Per Second Signal Time Mark
Have Quick Time Code
IRIG B Time Code
NTP

Manufactured By: Brandywine Communications

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The 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 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.

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)
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

A high precision oscillator maintains the internal time of the PTU. 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. A front panel switch controls the illumination of the display 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.

Variations

Model Number	Description	Oscillator Type	Power Supply	Form Factor	Power Type	Output Format	Input Format
PTU-OCXO	Portable Timing Unit - OCXO Oscillator Option	OCXO	Single AC, Single DC, Internal Battery	6" x 8" x 12"	AC, DC, Battery	1PPS, IRIG, Have Quick, RS232	GPS, Have Quick/1PPS, IRIG
PTU-RB	Portable Timing Unit Rubidium Oscillator Option - GPS Input Option	Rubidium	Single AC, Single DC, Internal Battery	6" x 8" x 12"	AC, DC, Battery	1PPS, IRIG, Have Quick, RS232	GPS, Have Quick/1PPS, IRIG
PTU-TCXO	Portable Timing Unit TCXO - GPS Input Option	TCXO	Single AC, Single DC, Internal Battery	6" x 8" x 12"	AC, DC, Battery	1PPS, IRIG, Have Quick, RS232	GPS, Have Quick/1PPS, IRIG
PTU-RB-28VDC	Portable Timing Unit Rubidium Oscillator Option 28VDC	Rubidium	Single DC, Internal Battery	6" x 8" x 12"	DC, Battery	1PPS, IRIG, Have Quick, RS232	GPS, Have Quick/1PPS, IRIG
PTU-RB-115VAC	Portable Timing Unit Rubidium Oscillator Option 115VAC	Rubidium	Single AC, Internal Battery	6" x 8" x 12"	AC, Battery	1PPS, IRIG, Have Quick, RS232	GPS, Have Quick/1PPS, IRIG
PTU-OCXO-HQ	PTU, OCXO Oscillator Option, HI-Z Have Quick Input	OCXO	Single AC, Single DC, Internal Battery	6" x 8" x 12"	AC, DC, Battery	1PPS, IRIG, Have Quick, RS232	GPS, Have Quick/1PPS, IRIG
PTU-OCXO	Portable Timing Unit with OCXO Oscillator Option	OCXO	Single AC, Single DC, Internal Battery	6" x 8" x 12"	AC, DC, Battery	1PPS, IRIG, Have Quick, RS232	GPS, Have Quick/1PPS, IRIG
PTU-OCXO-IRIG	Portable Timing Unit OCXO Oscillator Option - GPS Input Option W/ IRIG	OCXO	Single AC, Single DC, Internal Battery	6" x 8" x 12"	AC, DC, Battery	1PPS, IRIG, Have Quick, RS232	GPS, Have Quick/1PPS, IRIG
PTU-100E	Portable Timing Unit - 100BaseT Ethernet Version	Rubidium	Single AC, Single DC, Internal Battery	6" x 8" x 12"	AC, DC, Battery	1PPS, IRIG, Have Quick, RS232	GPS, Have Quick/1PPS, IRIG

GPS Receiver

Satellite Signal	GPS L1 1575.42 MHz
Satellite Code	C/A 1.023 MHz
Receiver Type	Parallel 16-Channel. All-in-view satellites tracked continuously and simultaneously.
Warm Start	<10 sec (Open Sky)
Autonomous Start	<60 seconds Cold Start (Open Sky)
Cold Start Requirements	Automatic: No input of time or position required
position Accuracy	2.4 m horizontal, 5 m altitude with respect to WGS84 after 24 hour position averaging
Timing Accuracy	+/- 50 ns. absolute UTC, Std Deviation 15ns (OCXO)
Timing Accuracy (Holdover mode, +/- 5°C)	< 20ms/day (TCXO), < 50 usec/day (OCXO), < 5 usec /day (Rb)

1PPS Output

Connector Type	BNC
Output Level	0-5V or 0-10V into 50 ohms link selectable by user
On Time	Rising Edge

Network Interface

Interface Type	10BaseT
Network Protocols	TCP/IP, UDP, NTPv3, HTTP, SNMP v1, DHCP

Serial Interface

Interface Type	RS232
Baud Rate	9600, N, 8, 1
Content	User configurable, broadcast 1/sec

IRIG Time Code Output

Connector Type	BNC
Code Type	B125, standard IRIG A135, E115, G145 optional
Control Functions	IEEE 1344
Output Level	3 Vpp into 600 ohm

Have Quick Output

Connector Type	BNC
Code Type	Have Quick II per ICD-GPS-060
Levels	0-5V

Alarm Status

Alarm Status	Voltage free relay changeover contacts

Status Indicator LEDs

Status Indicator LED's	Power, GPS Locked, Time Valid, IRIG, Have Quick, Fault, Battery Charge, Battery Low

1PPS Input

Connector Type	BNC
Input Level	2.5V to 5V
Input Impedance	50 ohms

Have Quick Input

Connector Type	BNC
Code Type	Have Quick II per ICD-GPS-060

IRIG Time Code Input

Connector Type	BNC
Code Type	B120, B122, B123, B125
Control Functions	IEEE 1344 supported
Input Impedance	600 ohm
Input Levels	1-6 Vpp

External Event Input

Trigger	Rising Edge triggered
Isolation	Optical
Input Impedance	5K
Max no. of Event	Last 100 events are stored
Max Repetition Rate	> 500 usec between events

Battery

Battery Life at 25 +/- 15 deg. C	24 hours (TCXO), 5 hours (OCXO), 3 hours (Rb)
Battery Charging Temperature	-20 deg. C to 50 deg. C

Environmental

Temperature	Instrument: -40 to +60 deg. C, Rb1 Option: -10 to +50 deg. C, Rb2 Option: -20 to +60 deg. C
Humidity	95%
Sealing	IP54, NEMA 3
Power	85-265VAC 50/60Hz, 12VDC
EMC Emission	EN55022, FCC Chapter 15 Part B
EMC Immunity	EN55024

Physical

Dimensions	6" Wide, 8" High, 12" Deep
Weight	11 lb. Typical

Brandywine PTU Datasheet.pdf

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Brandywine - PTU Network Ready Portable Timing Unit