The ESE ES-102 is a GPS-based Master Clock and Time Code Generator, designed to provide accurate time and date information from Global Positioning System (GPS) satellites. This data is then supplied to the user in various time code formats and via a front-panel display.

Function Description:

The ES-102 utilizes a twelve-channel GPS receiver, capable of tracking up to twelve satellites simultaneously, though only one is required for time data output. It generates four types of time code: SMPTE/EBU, ASCII, TC89, and TC90. Time and date information is also shown on a six-digit, 0.56-inch yellow LED display. Additionally, the unit provides two One Pulse Per Second (1PPS) outputs and a GPS "Lock" output.

Important Technical Specifications:

GPS Receiver: Motorola 12-channel.
1PPS Outputs: DB-9 connector, TTL outputs, positive edge true. One output (20% duty) has <500nS accuracy (directly from receiver), and the other (50% duty) has <1mS accuracy (regenerated).
ESE Time Code Output: BNC connectors, drives 100 readers, 4000' cable maximum. TC89 for non-"A" version readers, TC90 for "Date" readers and/or "A" version readers. Accuracy is 17mS.
SMPTE/EBU Time Code Output: XLR, 600Ω balanced or unbalanced. Accuracy is +/- 400mS if free running (due to Drop Frame compensation).
RS-232C Output: DB-9 connector, ASCII Date & Time, sent once per second. ESE Format "A" ASCII at 9600 Baud, 8 Data, No Parity, 1 Stop. Transmission ends 7mS before Time True.
Video Input: BNC, RS-170 composite video / blackburst, 1 VPP, 75Ω.
Drift: 33mS/Day.
Power: 117 VAC, 50/60 Hz, 15 Watts typical.
Mechanical: Rack Mount Enclosure 1.75" H x 19" W x 9.5" D (plus connectors).
Antenna: An "active" GPS Antenna (1.575 GHz) with 16' 5" cable is supplied.
Enclosure: Ruggedized, constructed of etched and clear anodized aluminum.

Usage Features:

Basic Installation: Primarily involves connecting the Antenna Cable and 117 VAC. Proper antenna mounting and cable routing are crucial for optimal performance.
Display: A green LED on the front panel indicates GPS "Lock" status (solid for locked, blinking at 1 Hz for pre-lock or lost lock).
EBU Time Code: Output via XLR, +/- 400mS accuracy, can be synchronized to a video source via the "Video In" BNC. Automatically re-synched to GPS at 2:00:00 AM. Predominantly used in Europe for TV, Cable, and Video.
SMPTE Time Code: Output via XLR, +/- 400mS accuracy, can be synchronized to a video source via the "Video In" BNC. Automatically re-synched to GPS at 2:00:00 AM. Predominantly used in TV, Cable, and Video. User Bits can display Month-Day-Year or Day of Year (001-366).
Drop Frame: Default setting for SMPTE Time Code. Non-Drop Frame SMPTE can be selected via DIP switch #7 on the ES-101 logic board.
Date: SMPTE user bits typically include Month-Day-Year. DIP switch #5 on the ES-101 logic board can reformat to Day of Year.
ESE Time Code: Efficient and cost-effective for Master Clock/Remote Clock Systems. Drives up to 100 remote displays up to 4000 feet via twisted pair or coax (RG-58 or RG-59).
RS-232C ASCII Time Code: Interfaces with PCs or other computer systems, transmitting date and time once per second via DB-9 connector. Includes Windows® and DOS software for continuous computer clock updates.
GPS "Lock" Output: TTL output via DB-9 connector, logic "1" when locked.
1PPS Output: Two outputs: a 20% duty signal (<500ns accuracy, direct from receiver) and a 50% duty signal (<1mS accuracy, regenerated by microprocessor for long-term timekeeping). Both are positive edge true and can drive Impulse Drivers (ES-165 or ES-162A) for Analog Impulse Clocks.
Time Zone: Receives GPS time in UTC. Factory set for end-user's time zone, or adjustable in the field using supplied software (ESEGPS or GPSINI.EXE) via RS-232C.
12/24 Hr: ESE TC89 Time Code can be output in 12 or 24-hour format (DIP switch #4 on ES-101 logic board for 24-hour operation).
Daylight Savings Time (DST): Automatic compensation via DIP switch #6 on ES-101 logic board (US standards). Custom foreign DST standards available.
Option K (Frequency Outputs): Provides a 1 KHz square wave, a 10 MHz sine wave, and a phase-coherent 1 PPS output. 10 MHz sine wave is 4 Vpp into 50 ohms (adjustable +/- 0.5V). 1 KHz square wave is 5 Vpp CMOS/TTL. Front panel 10 MHz Lock LED indicates "locked" and outputs within specifications (solid light). Blinks if GPS lock obtained but outputs are out of spec. Requires Option '45nS'. The system functions independently but receives input from the same GPS receiver. Initial lock-on and frequency stabilization can take up to 1 hour.
Option Hr (Relay Contact Closure): Provides relay contact closure on the Hour and Half-Hour. DIP switch #3 on ES-101 logic board can enable Hour ONLY closure. Rated at 10 watts maximum resistive load (500mA switching current). Contacts accessible on DB-9.
Option ANT (High Performance Antenna): For challenging EMI environments, includes 19 feet of cable.
Option DC: Operates exclusively from a DC source (+12 VDC to +36 VDC, 2 amp fuse).
Option J: For 220 VAC 50/60 Hz operation (standard is 117 VAC).
Option UL: External "wall wart" type UL/CSA approved transformer for UL-approved facilities.
Option 45nS (Improved Accuracy): Delivers 1PPS accuracy of <45nS. Enables "Time Delay" and "Cable Delay" setup features.
Time Delay (with 45nS option): Adjustable +/-400mS for advanced or delayed time output (e.g., compensating for video satellite delays). Configured via GPSHIFT(x).EXE DOS program.
Cable Delay (with 45nS option): Compensates for antenna cable delay, adjustable from 0 - 22,215 feet. Configured via GPSCBL(x).EXE DOS program.
Antenna Cabling Alternatives: Discusses methods for extending antenna cable length, including low-loss coax (RG-8, RG-213), in-line amplifiers (LA-12F, LA-12FN), and power dividers (ES-AB1A) with multiple in-line amplifiers. ESE test results provide guidance on maximum cable lengths for various configurations.

Maintenance Features:

Battery Backup: A lithium coin cell battery maintains GPS receiver configuration settings during power outages for up to four years. All outputs are suspended during power outages unless Option "BBU" or an external UPS is used.
Option BBU (Built-in Battery Back-Up/Charger System): Maintains time code outputs during a power outage for up to 4 hours. Displays are blank during power outage. Requires Option 'P'. Battery should be turned off during shipment or extended periods without main power.
Software for Configuration: A CD with "Setup" programs (also available on ESE website) allows for in-field configuration of Time Zone, Time Delay, and Cable Delay Compensation. Programs like ESEGPS (Windows®), MASTER32 (Windows®), MCDOS.EXE (DOS), GPSINI.EXE (DOS), GPSHIFT(x).EXE (DOS), GPSCBL(x).EXE (DOS), and GPSTIME.EXE (DOS) are provided.
Component Removal: For component removal, a 35W or smaller soldering iron and solder wick are recommended to prevent damage to the PCB.
Information Updates: All information in the manual is subject to change without notice. The "Readme" file on the CD or website may contain updates.

ESE ES-102 - Page 6