SLS JT-DO1 User Manual

1

JT-DO1 User Manual

The JT-DO1 GPS-disciplined IRIG-B timecode generator produces timecode according to the IRIG-

B007, DC level-shift (DCLS) format with BCD time-of-year (ToY), BCD Year, and Straight Binary

Seconds data. Time and Date information is provided by an onboard GPS receiver with an integrated

antenna1. The IRIG-B output signal is synchronized to the GPS 1 pulse per second (PPS) output.

The JT-DO1 generates IRIG timecode only when the PPS signal is present. In clear-sky conditions,

the JT-DO1 timecode generator exhibits timing accuracy better than 20 ns. For indoor installations,

timing accuracy is better than 500 ns. Device specifications are provided in Table 1.

Table 1: JT-DO1 specifications

Physical

Dimensions 4.62-in x 2.12-in x 1.0-in (L x W x H)

Mounting 0.2-in holes (4x)

Power

Supply Voltage 4.5 V-18 V
Current Consumption 60-160 mA

Environmental

Operating Temperature -20°C - +75°C

Communication

Serial 115,200 N-8-1

Timing Accuracy

Clear Sky ≤ 20 ns
Indoors ≤ 500 ns

1

The standard JT-DO1 timecode generator includes an integrated patch antenna. For indoor applications, or other
applications where the device does not have a clear-sky field of view, the JT-DO1 is available with an additional coaxial
input to support the connection of an external GPS antenna.

Page 2 of 6