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GSync®
Model 391 |
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The GSync® is a
compact 1U high, 19" rack mountable GPS Time and Frequency
instrument based on the FEI-Zyfer CommSync II Time and
Frequency system. When space is at a premium and redundancy
is not required, the modular design of the GSync offers a
perfect solution.
The instrument allows for a multitude of frequency and
timing outputs for various commercial and military
applications. The instrument is available with either a
Civil L1-C/A signal or with a Military L1/L2-P(Y) signal
SAASM receiver, and uses most of the same plug-in modules
used in the CommSync II. These include Low Phase Noise sine
wave, T1/E1, Time Code and NTP modules.
Like our flagship CommSync II,
the GSync provides a
frequency accuracy of 1E-12 and a time accuracy of <50ns
Peak to UTC.
Additional I/O slots can be utilized by
configuring a slaved GSync Time
and Frequency Distribution system.
For Monitor
and Control functions there is an RS-232 communications port
on the rear panel chassis, a front panel
keypad and display as well as optional Ethernet plug-in
modules providing Telnet, SNMP and Network Time Protocol.
Zyfer Monitor (Zyfer's remote access utility) provides
complete remote control, including system status, setup,
alarm logging and user management over a standard TCP/IP
connection.
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Rear Panel View |
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Comm. Port,
1 MHz, 10 MHz,
Antenna
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4
Input/Output
Hot-Swappable Option Module Slots |
Power Supply
AC or DC |
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Available Option Modules for
CommSync II and GSync Products |
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Output Specifications
(a) |
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 Frequency
Accuracy: |
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24 Hour
Average |
Rubidium
Oscillator |
Quartz
Oscillator |
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Locked to GPS |
< 1E-12 |
< 1E-12 |
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Holdover
(b)
-
first 24 hours |
< 5E-12 |
< 1E-10 |
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Time
Accuracy: - to UTC, for calibrated units
(c) |
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Rubidium
Oscillator |
Quartz
Oscillator |
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Locked to GPS |
< 50ns Peak |
< 50ns Peak |
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Holdover
(b)
-
first 24 hours |
< 3μs |
< 7μs |
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Short
Term Stability (d)
typical: |
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Allan
Deviation |
Rubidium
Oscillator |
Quartz Oscillator |
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1 sec |
< 3E-11 |
< 1E-11 |
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10 sec |
< 1E-11 |
< 1E-11 |
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100 sec |
< 3E-12 |
< 1E-10 |
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Phase
Noise (d)
typical: |
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Standard
Output |
Low Noise
5MHz |
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1Hz |
< -90
dBc/Hz |
< -105
dBc/Hz |
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10Hz |
< -105
dBc/Hz |
< -130
dBc/Hz |
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100Hz |
< -125 dBc/Hz |
< -143 dBc/Hz |
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1000Hz |
< -135 dBc/Hz |
< -153 dBc/Hz |
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GPS
Receiver Options |
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Standard
GPS Receiver - Civil C/A-Code: |
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Type: |
8 to 12 channel, independent
tracking |
| Frequency: |
1575.42MHz
(L1) |
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Code: |
C/A |
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Acquisition
Time: |
Warm Start: <
2 minutes, Cold Start: < 20 minutes. |
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SAASM
GPS Receiver - Military P(Y)-Code: |
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Type: |
12 channel, independent
tracking |
| Frequency: |
1575.42MHz
and 1227.42MHz (L1 & L2) |
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Code: |
C/A and P(Y) |
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Acquisition
Time: |
Warm Start: <
2 minutes, Hot/Cold Start: Dependent on
Initialization Device
(f). |
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Keyload
Interface: |
DS-102 (Red &
Black-key) |
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Standard Input/Output
(GSync Rear Panel) |
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Standard
GPS Receiver |
SAASM GPS
Receiver
(e) |
| 1PPS,
50Ω, TTL level, BNC, Ext. Sync Input |
1PPS, 50Ω,
TTL level, BNC, External Sync Input |
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RS-232
I/O connector |
RS-232 I/O
connector |
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10 MHz, 50Ω, TTL level,
BNC connector |
10 MHz, 50Ω, TTL level,
BNC connector |
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1PPS, 50Ω,
TTL level, BNC connector |
1PPS, 50Ω,
TTL level, BNC connector |
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GPS Antenna,
TNC connector |
GPS Antenna, TNC
connector |
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Keyload Interface -
DS-102 (Red & Black-key)
(g) |
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Hot Start connector
(optional)
(g) |
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Power
Options |
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Several Power Input
options are available, including 115-230 VAC 50/60 Hz or 12-48 VDC. |
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Chassis Physical
Dimensions |
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Height: |
44 mm (1.75") (1U) |
| Width: |
448 mm (17.65)
(19" EIA Rack) |
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Depth: |
381 mm (15.0")
including connectors |
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Weight: |
10 lbs. (max.) |
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Environmental |
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Operating
Temperature: |
0° C to 50° C |
| Rate
of Change: |
10° C/Hour |
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Storage
Temperature: |
-40° C to
+85° C |
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Relative
Humidity: |
5% to 95%,
non-condensing |
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Altitude,
Operating: |
-60m to 4000m |
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Altitude,
Storage: |
-60m to 9000m |
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Notes: |
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(a) After 2 hours of
GPS locked operation, fixed antenna location,
antenna delays entered. |
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After 48 hours of continuous operation. |
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(c) 2σ (95.5%
probability). |
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(d) Detailed
specifications for various output modules: See
"Option Module User's Manual 385-8003". |
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(e) The sale of
SAASM receivers is restricted to users
authorized by the U.S. Department of Defense. |
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(f) Dependent on the
accuracy of initialization parameters from PLGR
or DAGR handheld military GPS receivers, or
other initialization devices. |
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(g) Located on front
panel. |
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GPS
Time and Frequency Systems
High Performance: 
