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Timing & Frequency

Brandywine PTS (Precision Time System)
Product Overview
  • GPS Disciplined Atomic Clock
  • Remote Control over ethernet with included browser
  • SA-ASM GPS Receiver option
  • Network Time Server
  • Serial COM port for setup
  • 10MHz, 1PPS, IRIG B, ICD-060 serial time code


The PTS is a state of the art frequency instrument using a disciplined atomic clock to offer a wide range of features and time and frequency outputs accurate to <20nsrms to UTC (USNO) and 1x10-12 respectively. This product is both economic and very reliable, offering complete remote control and monitoring via a web-browser based interface. Applications include central time and frequency systems, satellite earth stations, and military communications systems network time servers. This product is one of Brandywine's staples and can be ordered in high quantity and has quick turn-around delivery.

The PTS can be used in either a single or dual redundant configuration and in conjunction with one of Brandywine Communications range of Distribution Amplifiers, such as the FTSU-100.

Applications for the popular PTS include central time and frequency systems, satellite earth stations, military communication systems, and high availability network time servers.

An extremely accurate internal Rubidium oscillator is used as the internal time base that drives all the time and frequency outputs. This Rubidium oscillator is disciplined using an advanced control algorithm, ensuring superior holdover performance. The time constants of this algorithm are user-adjustable to suit specific applications.

The PTS is available both with standard C/A code and optional P(Y) code SA-ASM GPS receiver. It may also be disciplined to an external 1PPS/HaveQuick time code source.

A 10baseT Ethernet port is provided which is used both for monitoring and control of the instrument and for Network Time Protocol. This interface supports both fixed and dynamic IP address assignment via DHCP.

In addition to configuring the PTS, the built-in web browser provides information on GPS, internal monitoring of time errors, and internal parameters of the atomic oscillator. The user may set thresholds of any monitored parameter to trigger an alarm.

A precision 1PPS time mark is available for synchronizing or calibrating other equipment and the IRIG B serial time code allows synchronization to be distributed to other computers, displays and related equipment requiring precise time.

An ASCII serial port outputs any user-selected time of day message at a 1/sec rate for synchronizing other equipment. The same output port may also be configured to output 50 bit/sec BCD time code in accordance with ICD-GPS-060.

A high stability 10MHz sine wave output provides an ultra-stable, low phase noise frequency reference derived from an SC cut crystal that is locked to the rubidium reference.

Specifications & Detail

1 PPS Output
Connector SMA
Type 5V0-pk, 10 microseconds wide
On Time Rising edge
Serial Interface
Port Function Setup and Control
Connector DB9
Type RS232
Baud Rate 300-115,200 (Default 115k N, 8, 1)
Sine Wave Output
Number of outputs 1
Connector SMA
Frequency 10 MHz
Level 2.5 Vpp into 50 Ohms
Harmonic Distortion <25dBc
Phase Noise (SSB) <-130 dBc/Hz (10Hz) typical
<-140 dBc/Hz (100Hz) typical
<-150 dBc/Hz (1000 Hz) typical
Time Code Output 1
Number of Outputs 1
Code Format (link sel) IRIG B 1kHz or DC level
Level 2.2 Vpp 600 Ohms HCMOS
Connector SMA
Time Code Output 2
Number of outputs 1
Code format 50 bit BCD ICD-GPS-060 or ASCII
Level (link selectable) RS-232 (4,800, N, 8, 1) or BCD
Connector DB-9
ASCII format 1/sec user-programmable string
Fault Alarm Status
Output Type HCMOS level
Output polarity User programmable
Connector DB-9
Instrument 0 to + 50°C
Antenna -40 to +85°C
Humidity To 95% non-condensing
Power 110/230 Vac
Optional Power 24 Vdc, -48 Vdc, 125 Vdc
Dimensions 3.25” x 7.25”x 15.8”
With rack mount adapter 19 inch Rack Mount, 3.48” (2U) height, 15.80” depth in rack
Weight 5.5 pounds, typical
GPS C/A Code Receiver Specification
Receiver type Motorola Oncore UT+
8 channel C/A code timing receiver
P(Y) Code GPS Receiver Specification Option)
Receiver Type GRAM SA-ASM receiver
Satellite Signal GPS L1, L2Dual Frequency
Satellite Code C/A, P(Y)
Receiver Type Parallel 12 Channel 12 all-in-view receiver
Position Accuracy 16m SEP in SA/AS environment with
respect to WGS-84 with CV loaded
Warm start <120 seconds with Almanac, CV loaded
Anti-spoofing Accuracy maintained in spoofing environment up to 10db> satellite signals
Jamming Operates with 34dB J/S at both L1and L2
Cold Start Requirement Automatic. No input of time or position
CV Fill compatibility Via KYK-13
Timing Accuracy
Tracking satellites ±100 ns. Absolute UTC
Std Deviation 20 ns
Holdover Mode One microsecond/day
Frequency Stability
Tracking satellites See table below
Holdover Mode
Aging <5x10-11/month after 30 days aging
Temperature ±1x10-100 to 50°C
Ethernet Interface
Type 10BaseT (100 base T optional)
Connector RJ45
Protocols Supported NTP (RFC1305), SNTP, Daytime
Web Browser 5 pages
Status, GPS, Configuration, Alarms, Charts
IP selection Static or Dynamic via DHCP
Protocols Daytime, Telnet, FTP, DHCP, Time
FTSU-100 Frequency Synthesizer Distribution Amplifier
Time/message display
Video Time/message inserters
Timing plug ins for CPCI, PCI, PC104, VME, PMC and ISA platforms
Time and Frequency distribution

Data Sheet & Downloads