Receiver Characteristics:

Timing Accuracy:

Specifications apply at the 1 PPS output, in the presence of Selective Availability (SA), as of date of publication.

UTC/USNO:  ±100 ns rms, 1 PPS output

Typical:  < 40 ns rms, in Position-Hold Mode

Internal Oscillator:

Standard:  DCXO, 1x10^-7, unlocked

Allan variance:  (locked to GPS, in Position-Hold Mode)

1 second:  5x10^-10 (2x10^-10, typical)

1 day:  5x10^-13

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:

10 meters, rms, 90% confidence

Satellite Tracking:

Twelve (12) channel, 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:

• 150 seconds typical, cold start
• 15 minutes, 90% confidence, cold start
• 40 seconds, with almanac less than 1 month old
• 15 seconds, with ephemeris less than 4 hours old
• The GPS Data Backup Battery is included in all Model 1084s. This feature improves acquisition time by supplying constant power to the real-time clock and RAM in the GPS receiver module.

I/O Configuration:

Connectors:

Three BNC, one IRIG-B Modulated and two user-configurable:

1. IRIG-B Modulated, bus driver, 4 Vpp, 20 ohms source impedance, drives a 50-ohm load at 3 Vpp
2. IRIG-B unmodulated or Programmable Pulse; jumper-selectable
3. 1 PPS, IRIG-B unmodulated or IRIG-B modified Manchester; jumper-selectable

Jumper-selectable outputs are 5 V CMOS bus drivers with 10 ohms source impedance and ±75 mA drive capability.

Relay Contacts:

Two (2) sets, Form C (SPDT) fail-safe, 0.3A at 130 Vdc; one is Locked function; the second one is jumper-selectable and may be Fault, 1 PPH, or Programmable Pulse

Programmable Pulse Output:

Four modes:

1. Every 1 to 60,000 seconds, starts top of the minute
2. Hourly at a specified offset
3. Daily at a specified time of day
4. One-shot at a specified time of year

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.

Event A Input:

One input is available as an alternate function, with a simple hardware modification to the 1 PPS configurable output. The input may be configured to accept an external 1 PPS signal, and measure the deviation from 1 PPS/GPS with 100 ns resolution. Each input may also be configured to record up to 500 sequential events with 100 ns resolution, provided that the events are separated by 11 ms. Event data is stored in battery-backed RAM.

Interface:

Operator:

Display: 

• Status LEDs (Models 1084A/B/C)
• 2 x 20 character supertwist LCD (Model 1084B/C)
• 20 mm (0.8 in.) LED; 9 digits (Model 1084C)

Functions: 

• Time: UTC or local
• Position: latitude, longitude, altitude
• Receiver and clock status
• 1 PPS (input) deviation
• Event time

Status LEDs: 

• Operate (green)
• On Line (green)
• Unlocked (red)
• Fault (red)

Keypad:  Eight keys; select display functions or setup menus (Model 1084B/C)

Setup: 

• Local time offset
• Output code select: Local/UTC
• Recorder output A
• Daylight Saving Time: On/Off/Automatic
• Backlight control: On/Off/Automatic
• Event input: Event/1 PPS
• 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
• Serial port: RS-232

System:

RS-232:  1200 to 19,200 baud; 7 or 8 data bits; 1 or 2 stop bits; even/odd/no parity

Interrogate mode 

Broadcast modes: 

• Standard ASCII (IRIG-J)
• Extended ASCII
• ASCII with Time Quality
• ASCII with Time Quality and Year
• Vorne large-display time
• Status/Alarm
• Event data

Connector:  Male 9-pin D-sub (TXD, RXD, AUX IN, AUX OUT)

AUX OUT  can provide programmable pulse function at RS-232 levels

RS-422/485  transmit only

Second RS-232 port  available (1084opt19)

Connector:  Male 9-pin D-sub (TXD, RXD)

Certifications and Approvals

CE mark/label and certificate:

Power Requirements:

Standard:

Voltage:  85 to 264 Vac, 47 to 440 Hz, 20 VA maximum or 110 to 350 Vdc, 15 W maximum

Inlet:  IEC-320 with fuse and mating cordset. Specify option P01 - P10

Available cordset plug style and specifications are described in the Options and Accessories Options and Accessories section

General:

Physical:

Size:  1 RU rack mount or tabletop, 260 mm deep FMS, Rack mounts included.
508 x 381 x 203 mm (20 x 15 x 8 in.), shipping

Weight:  2 kg (4.5 lbs), net
5.5 kg (12 lbs), shipping

Antenna:

Mounting:  0.75 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:

Type:  RG-6, 15 m (50 ft) provided

Weight:  0.69 kg (1.52 lbs) per 15 m

Environmental:

Operating Temperature:  0° to +50° C (-20° to +70° C typical)

Nonoperating Temperature:  -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 801-4

Options:

Except as noted otherwise, only one I/O Option may be installed. Available options are listed below and described in the Options and Accessories Options and Accessories section.

I/O:

Power (select only one):

General:

Accessories:

Included:

Available: