FRU-SAASM
The FRU is a state of the art, high-precision frequency standard capable of outputting ten isolated precision 10MHz frequency reference outputs. The FRU uses an internal GPS receiver to control a precision oscillator with accuracy up to 1 x 10-12 and excellent short term stability. The FRU meets the frequency stability requirements of MIL-STD-188-164A for SHF terminals.
A particular feature of the FRU is the ultra-high isolation (>100dB) between the 10MHz outputs, eliminating interaction between 10MHz outputs when they are loaded/unloaded. The FRU incorporates a high-sensitivity 12 channel GPS Receiver.
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 FRU. The FRU 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 Combination SAASM & M-Code GPS receiver is available for military applications.
Variations
| Model Number | Description | Oscillator Type | Power Supply | Form Factor | Power Type | Output Format | Input Format |
|---|---|---|---|---|---|---|---|
| TRU-SAASM | Time Reference Generator with SAASM GPS Input - 1U Rack Mount | OCXO | Single AC | 1U | AC | HQ, 10MHZ, IRIG, 1PPS, NTP | GPS, 1PPS, HQ |
| FRU-SAASM | Frequency Reference Generator with SAASM GPS Input - 1U Rack Mount | OCXO | Single AC | 1U | AC | HQ, 10MHZ, 1PPS, NTP | GPS, 1PPS, HQ |
Features
- 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
Specifications
GPS Antenna Input
| Connector Type | BNC |
1PPS Input
| Connector Type | DB-15 |
| Input Level | 0-10 Vpk |
| Input Impedance | 50 Ω |
Have Quick Input
| Input Level | 0-5 Vpk |
| Input Impedance | 2 kΩ |
10 MHz Output
| Number of Outputs | 10 |
| Output Frequency | 10 MHz |
| Accuracy | 1E-12 (24hr avg.) |
| Output Amplitude | +13 dBm |
| Harmonics | <40 dBc |
| Non-Harmonic | <90 dBc |
| Isolation | <-100dBc when adjacent channel is opened or shorted |
| Phase Noise | See datasheet for details. |
| Phase perturbation | <5mdeg. in 0.2sec |
1PPS Output
| Accuracy | ±50ns |
| Connector Type | DB-15 |
| Output Level | 0-10 Vpk |
| Output Impedance | 50 Ω |
Have Quick Output
| Connector Type | DB-15 |
| Output Level | 0-5 Vpk |
Power
| Power | 90-265 VAC |
| Power Consumption | <15 Watts |
Control and Status
| Connector Type | 10/100 Base T Ethernet |
| Number of Ethernet Ports | 2 |
| Network Protocols | IPV4, IPV6-ready, SNMP v1, NTP v3 |
| Graphical Interface | BWC Application |
GPS Receiver
| Receiver Type | GB-GRAM |
| Frequency | L1, L2 Dual Frequency |
| Satellite Code | C/A, P(Y) |
| Receiver Type | Parallel 12 Channel |
| Position Accuracy | 14m SEP |
| Warm Start | <120 seconds with Almanac, CV loaded |
Reliability
| Mean Time Between Failures | >70,000 hours |
Physical
| Dimensions | 1U Rack mount: 19 in. x 1.72 in. x 14 in. |
Environmental
| Humidity | 95% Non-condensing |
| Temperature | |
| Operating | 0 to +50ºC |
| Storage | -45 to +85ºC |
| Temperature Shock | -20 to +70 ºC 3 ºC/min |
| Vibration | 1.5g peak. 50-2000Hz |
| Shock | MIL-STD-188-164A para. 5.1.2.16.c |
