TSAT-S GPS Timing Board
GPS Timing Board with S-bus Interface - Model TSAT-S
- GPS synchronized timecode generator
- GPS, IRIG-A, IRIG-B, NASA36 timecode reader
- IRIG-B output
- Time-Tag input
Product Overview
The TSAT-S is a complete system package that includes the GPS Receiver/Antenna, a 100-foot antenna cable, and a circuit card assembly for the S-bus. The board synchronizes its on-board clock to Coordinated Universal Time (UTC). A time-tag TTL input is also provided.
GPS satellites provide Coordinated Universal Time (UTC) accurate to within one microsecond.
In the unlikely event that reception of the satellite signals is lost, the board continues to increment time (“freewheel”). When the signals are re-established, the board automatically resumes synchronization.
A programmable time offset allows for compensation for cable delays, and provides position with longitude, latitude, and elevation.
Technical Specifications
| GPS Receiver/Antenna |
Number of Satellites
8
Acquisition Time (cold start)
5 min typ, 15 min max
Re-acquisition Time
<10 seconds
Frequency
1575 MHz (receive only)
(L1 band, C/A code {SPS})
Sync to UTC
Within ±1.0 uS max
(antenna in stationary position)
Position
25 m SEP (w/o SA)(82 feet)
Altitude
-400 m to +18,000 m
(–1,132’ to +59,055’)
Size
147 mm Diam, 100 mm H (5.8” Dia, 3.9” H)
Pole Mount
1.00” I.D., 14 turns/inch straight
Operating Temp
–30 to +70 C (–22 to +156 F)
Storage Temp
–55 to +100 C (–67 to +212 F)
Waterproof
Submersion to 1 m
Salt Fog
MIL-STD-202F
Method 101D
Condition B |
| Antenna Cable |
Length
30.5 m ± 0.2 m (100’ ± 8”)
Maximum Length
92 m (300’)
Cable Size
9 mm (0.35”) O.D.
Connector Size
20 mm (0.79”) O.D. (antenna end)
46 mm (1.80”) O.D. (board end & extension cable) |
| General |
Size
L 150 mm, W 84 mm, H 21 mm
Power (from bus)
+5Vdc @ 0.4 Amps max
+12Vdc @ 100 mA max
–12Vdc @ 20 mA max
Operating Temperature
–30 to +70 C (–22 to +156 F)
Storage Temperature
–40 to +80 C (–40 to +176 F)
Connectors
BNCs for timecode input and output;
DB-15 (socket) for timecode input and output, heartbeat output, match output, time–tag input, and 1 PPS input |
| Timecode Input |
Code Format (Autodetect)
IRIG-A (A132), IRIG-B (B122), NASA36
Amplitude
1.2Vp-p min, 8.0Vp-p max
Polarity
Detected automatically
Modulation Ratio
2:1 min, 3:1 typ, 4:1 max
Input Impedance
>10K ohms
Input Time Accuracy
Better than 100 ppm
(not suitable for tape playback)
Common Mode Voltage
Differential input, ±100V max |
| IRIG-B Output |
Code Format
IRIG-B (B122)
Amplitude (Adjustable)
2.6Vp-p typical
Modulation Ratio (Adjustable)
3:1
Output Impedance
600 ohms |
| Time-Tag Input |
Input Voltage
–0.5V min, +0.8V max for logic 0
+2.0V min, +5.5V max for logic 1
Tags rising edge
Input Current
< 5 uA for logic 0 or logic 1
Rise/Fall Time
500 nS max
Repetition Rate
1000 events per second max
Timing Resolution
1 uS |
| On-board Clock |
Resolution
1 uS
Range
366:23:59:59:999999
Date Format
Integer (001–366)
Propagation Delay Correction
–1000 uS through +8999 uS
Propagation Delay Setting
Programmed
Synchronization Time
<20 seconds
Stability
Disciplined to timecode: 2 x 10-7
Undisciplined: 1 x 10-6 |
| S-Bus Interface |
Offset 8000 Time (lower 32 bits)
Offset 8004 Time (upper 32 bits)
Offset 8008 Command Register
Offset 8009 Software Event Trigger
Offset 800A FIFO (read only)
Offset 800B Status Register
Offset 800C (reserved)
Offset 800D Software Reset
Offset 800E (reserved)
Time Between Accesses
100 uS min
Necessary Accesses
2 (read time, 32-bit mode)
14 (read time, 8-bit FIFO mode)
12 (read time-tag, 8-bit FIFO mode)
11 (set time) |
Ordering Information
| 1 |
Specify Spectracom Model TSAT-S
(+ option #) |
| Options |
– HB1PPS
Extended frequency range for heartbeat output
–TRIM-CAB-D-D-100
Extension cable for antenna
–GPS Optic Isolator
Drivers
All major operating systems
are supported.
Contact Spectracom for details. |