TIMING AND FREQUENCY PRODUCTS

Model 1088B

GPS Satellite-Controlled Clock

The Arbiter Systems®, Inc. Model 1088B GPS
Satellite-Controlled Clock provides unprecedented
flexibility, performance, and value for worldwide timingapplications. Combining GPS accuracy and ease of use
with exceptionally flexible interface features and options
in a space-saving package, the Model 1088B offers
unparalleled value in GPS-synchronized clocks.
Flexibility
Offering standard operation from worldwide AC powersources, plus 110 to 275 Vdc sources (also standard),
the Model 1088B integrates into most environments withno options required. Optional power configurations include
terminal-strip power inlet (1088opt07), surge-withstandcapability (1088opt15) and 10 to 60 Vdc operation(1088opt08).
Standard user-configurable input/output (I/O)
capabilities provide over 260,000 possible configurations,with 22 different available signals, in the standard unit
alone. With the addition of the available options, trillions
of combinations are possible!
The available I/O options add a wide variety ofcapabilities to the Model 1088B. Additional outputs areavailable in a variety of formats, including fiber optic.
High-performance internal oscillators are also available.
With Option 28, the Model 1088B is a Power SystemTime, Frequency and Phase Monitor with state-of-the-artaccuracy.

Performance
The Model 1088B offers full-specified GPS timing
accuracy of 100 ns rms from UTC/USNO. Typicalperformance is less than 40 ns rms. The Model 1088B
provides this performance 24 hours a day, anywhere inthe world.
Value
The Model 1088B GPS Satellite-Controlled Clock wasdesigned from the beginning to offer the greatest possible
flexibility and value for a wide range of applications. See
what we mean – compare the unmatched flexibility,performance, and value for yourself – put the Model
1088B to work in your system today!
Related Products
If your application does not require the outstanding
flexibility and configurability of the Model 1088B, consider
Models 1084A/B/C, 1092A/B/C and 1093A/B/C. All offer
significant cost savings and many of the most-neededfeatures of the Model 1088B
Redundant configurations are available for applications
that require even more resistance to loss of GPS
synchronization. The redundant configuration consistsof two clocks with clock-to-clock communications andan interconnect arbiter.

Arbiter Systems, Inc. · 1324 Vendels Circle, Suite 121 · Paso Robles, CA 93446 · USA
Tel: +1.805.237.3831 · Fax: +1.805.238.5717 · E-mail: sales@arbiter.com · Internet: http://www.arbiter.com

11

TIMING AND FREQUENCY PRODUCTS

Model 1088B Specifications
Receiver Characteristics
Timing Accuracy
Specifications apply at the 1 PPS output, in thepresence of Selective Availability (SA), as of date ofpublication.
UTC/USNO ±50 ns rms, when receiving 4 or moresatellites and Position-Hold Mode on
UTC/USNO ±100 ns rms, receiving a single satellite
and Position-Hold Mode on
UTC/USNO ±200 ns rms, when receiving 4 or moresatellites and Position-Hold Mode off
Synchronization
CMOS output signals are synchronized to the 1 PPS
output, ±50 ns, maximum.
IRIG-B modulated, ±1 µs, maximum
The leading edge of the start bit of a received RS-232
data message may be selected to trigger the Event A
input, providing synchronization with 100 ns resolution.
Position Accuracy
25 meters, SA off
100 meters, SA on
Altitude, 140 meters, SA on
All specifications rms, 95% confidence, with PositionHold Mode off and receiving at least four satellites
Satellite Tracking
Twelve (12) channel, GPS-L1, C/A code (1575.42 MHz).
Receiver simultaneously tracks up to twelve satellites.
Results from all tracked satellites are averaged in
Position-Hold Mode or, with Position-Hold Mode off,
using least-squares estimation.
Acquisition
2 minutes typical
25 minutes, 90% confidence, cold start
66 seconds, 90% confidence, with almanac less than
1 month old
30 seconds, 90% confidence, with ephemeris lessthan 4 hours old
The GPS Data Backup Battery is included in the Model1088B. This feature improves acquisition time bysupplying constant power to the real-time clock and
RAM in the GPS receiver module.

12I/O Configuration

Connectors
Four, BNC, user-configurable. Each connector isconfigurable as a specific input function or as any oneof 22 output functions, listed below, by means ofinternal, push-on jumpers. Each output connector isindependently buffered. Configuration is easily changedin the field. Refer to the options section for more
outputs.
Analog outputs are op-amp (LF353) followers with 560ohm protective resistors.
CMOS outputs are buffer type (74HC126) with 47-ohm
source resistors.
Input Functions
Channel A
Event or 1 PPS: 5 V TTL/CMOS level
Channel B
Event or 1 PPS: 5 V TTL/CMOS level
Freq. Reference 5 V TTL/CMOS or AC-coupled;
100 kHz, 1 MHz, 5 MHz, or 10 MHz
Output Functions
AnalogIRIG-B, 1 kHz modulated, 10 Vp-p
1 PPS deviation; ±5 V at 10 µs/V
5 V CMOS
IRIG-B, E, D, or H, DC level-shift
1 PPS, 1 PPM, 1 PPH
1, 10, 50, 60, or 100 PPS
1k, 10k, or 100k PPS
1M, 5M, or 10M PPS
LockedProgrammable Pulse
IRIG-B modified Manchester (IEEEStandard 1344)
Event A/B Inputs
Two inputs are available, each having 100 ns timing
resolution. Each input may be configured to accept anexternal 1 PPS signal, and measure the deviation from
1 PPS/GPS or to record up to 300 sequential events(separated by 11 ms). Event data is logged in batterybacked RAM and may be read or cleared from the front
panel or RS-232 interface.

Arbiter Systems, Inc. · 1324 Vendels Circle, Suite 121 · Paso Robles, CA 93446 · USA
Tel: +1.805.237.3831 · Fax: +1.805.238.5717 · E-mail: sales@arbiter.com · Internet: http://www.arbiter.com

TIMING AND FREQUENCY PRODUCTS

Model 1088B Specifications
I/O Configuration (Continued)

Interface (Continued)

Programmable Pulse Output
Four modes:• Every 1 to 60,000 seconds, starts top of the minute• Hourly at a specified offset• Daily at a specified time of day• One shot at a specified time of year

SystemRS-232

Pulse duration is programmable from 0.01 to 600
seconds, except in one-shot mode, where the output
is Low prior to the specified time and High thereafter.

1200 to 19,200 baud; 7 or 8 data bits;
1 or 2 stop bits; even/odd/no parity
Has Interrogate (normal) and six
Broadcast modes: standard ASCII(IRIG-J), Vorne large-display, status/
alarm, extended ASCII, event data,and ASCII with time-quality
Male 9-pin D-subInterface

Power Requirements

Operator
Display
FunctionsStandardVoltage

Status LEDs

Keyboard
Setup

2 x 20 character supertwist LCD
Time: UTC or local
Position: latitude, longitude, altitude
Receiver and clock status
1 PPS (input) deviation
Event time
Operate (green)
On Line (green)
Unlocked (red)Fault (red)Battery Charge (green)
Battery in Use (green)
Battery Low (red)Eight keys
Local time offset
Output code select: Local/UTC
Daylight Saving Time:
On/Off/Automatic
Backlight control: On/Off/Automatic
Event input: Event/1 PPS, for each
input A and B
Programmable Pulse setup
Antenna delay
Clock offset
Out-of-Lock time: 1 to 99 minute(s),Off, or Zero Delay
Auto-Survey: On/Off, Survey duration
Position Hold: On/Off, Position
Auto/Manual
Option Configuration and Setup
Recorder output A/B
Frequency Reference: standard(internal) or external
Serial port: RS-232

Inlet85 to 264 Vac, 47 to 440 Hz, 20 VA max.
or 110 to 275 Vdc, 15 W maximum
IEC-320 with fuse and matingcordset. Specify cordset P1-P10.

GeneralPhysicalSize

1 RU rack mount or tabletop; 260 mm
deep FMS. Rack mounts included.
508 x 381x 203 mm (20 x 15 x 8 in.), shipping
Weight2 kg (4.5 lbs), net
5.5 kg (12 lbs), shipping
Antenna0.75 in. pipe (1 in. - 14 marine) thread
Cable Connection: F-type
Size: 77.5 dia. x 66.2 mm (3.05 x 2.61 in.)
Weight: 170 grams (6.0 oz)
Antenna Cable RG-6 type, 15 m (50 ft) provided
Weight: 0.69 kg (1.52 lbs) per 15 m
EnvironmentalTemperature
Operating: 0° to +50° C(-20° to +70° C typical)
Nonoperating: -40° to +75° C
Humidity
Noncondensing
EMC
Radiated susceptibility: passes
walkie-talkie test
Conducted emissions: power supply
complies with FCC 20780, Class A
and VDE 0871/6.78 Class A
Surge withstand capability (SWC),
power inlet: designed to meet
ANSI/IEEE C37.90-1 and IEC 801-4Arbiter Systems, Inc. · 1324 Vendels Circle, Suite 121 · Paso Robles, CA 93446 · USATel: +1.805.237.3831 · Fax: +1.805.238.5717 · E-mail: sales@arbiter.com · Internet: http://www.arbiter.com

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TIMING AND FREQUENCY PRODUCTS

Model 1088B Options
Certifications and Approvals

Options (Continued)

CE mark/label and certificate

Oscillator and Timing
Description
OCXO and Four Additional
Configurable Outputs

Options
There are two internal option slots in the Model 1088B andoptions fit into two categories: those that require internal
option slot space, and those that do not. Only one option
may occupy the individual Option Slots. Available options
are listed below and described in the Options andAccessories section, starting on page 32.
I/O
Description
Four Additional Configurable Outputs
Parallel BCD Output 1 ms Resolution
BCD with Second RS-232 Port
Second RS-232
Self-Monitor IRIG-B Distribution
System and Second RS-232 Port
Out-of-Lock Relay 1 Form C (SPDT)
Four Configurable Fiber-Optic Outputs
COMTRADE Sample Rate Generator
Extended BCD Output
8-Channel High-Drive IRIG-B Output
Power System Time, Frequency
and Phase Monitor
Four Additional Outputs with Dry
Contact and +25/50 Vdc
Internal Network Time Protocol(NTP) Server

1088opt121
Order No.
1088opt01

Accessories
Order No.
1088opt031
1088opt042
1088opt172
1088opt17A2
1088opt182
1088opt192
1088opt20A1
1088opt233
1088opt242
1088opt272
1088opt281
1088opt292
1088opt322

Power (select only one)
Description
Order No.
IEC-320 Power Inlet,
85 to 264 Vac, 110 to 275 Vdc
IncludedTerminal Power Strip,
85 to 264 Vac, 110 to 275 Vdc
1088opt07
Terminal Power Strip, 10 to 60 Vdc
1088opt08
Surge Withstand & Terminal Strip 125 Vdc 1088opt15ASurge Withstand & Terminal Strip 250 Vdc 1088opt15B
Available cordset plug style and specifications aredescribed in the Options/Accessories section, page 35.

14General
Description
LCD Backlight

Order No.

Included
Description
GPS Antenna, pipe mountable
15 m (50 ft) RG-6 Antenna Cable
Rack Mount Kit
Operation Manual
Power Cord (see page 35)
Available
Description
15 m (50 ft) RG-6 Antenna Cable
30 m (100 ft) RG-6 Antenna Cable
45 m (150 ft) RG-6 Antenna Cable
60 m (200 ft) RG-6 Antenna Cable
75 m (250 ft) RG-6 Antenna Cable
GPS Antenna Mounting Kit
21 dB In-Line Preamplifier
GPS Surge Protector Kit
Antenna Grounding Block Kit
300 m (1000 ft) Roll RG-11 Cable
RG-6 Crimp Tool
RG-11 Crimp Tool + 25 F-type Connectors
High Interference GPS Antennaand Mounting Adapter Kit
Rack Slide Kit

Order No.
AS0076200
CA0021315
AS0028200
AS0029900
P01-P10
Order No.
CA0021315
CA0021330
CA0021345
CA0021360
CA0021375
AS0044600
AS00447004
AS0049000
AS0048900
WC0004900
TF0006400
AS0044800
AS0062000
AS0033100

1

Uses Option Slot A
Uses Option Slot B
3
Uses either Option Slot A or B
4
Used for cable length greater than 75 m (250 ft)
2Arbiter Systems, Inc. · 1324 Vendels Circle, Suite 121 · Paso Robles, CA 93446 · USA
Tel: +1.805.237.3831 · Fax: +1.805.238.5717 · E-mail: sales@arbiter.com · Internet: http://www.arbiter.com