The GPS Airborne Approved PTS-SAASM is a frequency standard and complete master clock containing a GPS Rubidium Oscillator. This military timing system is one of the most reliable master clocks on the market today and is used for many of our U.S. security systems.
The definition of SAASM is Selective Availability/Anti-Spoofing Module. The PTS-SAASM is a state of the art frequency instrument offering a wide range of features and time and frequency outputs accurate to < 40ns rms to UTC (USNO) and 1x10-12 respectively.
This frequency standard offers a full suite of low phase noise outputs including: IRIG B, Have Quick, 10MHz, 1PPS, serial time navigation messages and provides a complete Network Time Server using NTP (Network Time Protocol). The built-in web browser provides status information about the GPS system, monitoring of internal time errors and user access to a number of alarm thresholds. Both single and dual redundant models are available for the PTS-SAASM.
The PTS-SAASM is used as a part of many time and frequency systems Brandywine makes for military customers. In our November 2010 newsletter, Brandywine shares how they created a large time and frequency master clock system for a customer using the PTS-SAASM. Click here to go to our November Newsletter.
Features
- GPS disciplined atomic clock
- Network time server
- Dual redundant version available
- Complete remote network control using standard web browser
- SA-ASM GPS Receiver
- 10MHz, 1PPS, Irig-B, serial and time codes
- Timing accuracy < 40ns rms to UTC
This new generation of network appliance is economical and reliable and offers complete remote control and monitoring via a web-browser based interface.
The PTS-SAASM 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-SAASM 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.
A low cost rack adapter is available (not shown).
The PTS-SAASM utilizes a 12 channel P(Y) code SAASM GPS receiver. It may also be disciplined to an external 1PPS/HaveQuick time code source. A 100baseT 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-SAASM, 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
| 1 PPS Output | ||||||||||
| Connector | SMA | |||||||||
| Type | 5V 0-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) | ||||||||||
| 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 | |||||||||
| Environmental | ||||||||||
| Temperature | ||||||||||
| 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 | ||||||||||
| L1 only | ||||||||||
| P(Y) Code GPS Receiver Specification Option) | ||||||||||
| Receiver Type | GRAM SA-ASM receiver | |||||||||
| Satellite Signal | GPS L1, L2 Dual 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 | ||||||||||
| Anti-spoofing | Accuracy maintained in spoofing environment up to 10db> satellite signals | |||||||||
| Jamming | Operates with 34dB J/S at both L1 and L2 | |||||||||
| Cold Start Requirement | Automatic. No input of time or position | |||||||||
| required. | ||||||||||
| 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 | ± 1x10-10 0 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 | |||||||||
| Other products | ||||||||||
| 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 | ||||||||||
 PTS-SAASM- Precision Time and Frequency System | User Manual |
