Brandywine - FRU-SAASM Frequency Reference Unit - Combination M-Code & SAASM Version
- 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
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 |
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
GB-GRAM |
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 Bertween 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 |
Phase Noise |
MIL-STD-188-164A para. 5.1.2.16.c |