JD-3 GPS Time Master Clock is designed as the professional standard time signal source to satisfy the needs from daily operation of radio broadcasting. It has the functions of acquiring GPS standard time code automatically, sending time signals to secondary clock and network system continuously and announcing time on the hour.

JD-3 Master Clock

Features:

· Adjustment of time code output

· High-quality voice of time reminder

· Separate output of time code. Communicate with 100 secondary clocks at the same time.

· Sending uniform time signals to the whole network

· Chinese menu and monitor output

· Multi-display modes on the screen

· Real-time display on the panel

· Dimension: 19-inch, 1U

Functions:

· All the specifications accord with GB/T 4961-1999 standard.

· Reliable internal clock circuit. On the GPS receivable condition, it can keep with the Greenwich mean time and automatically switch to local operation under the poor receiving condition.

· Adjustment of time code output from -2.5s to +2.5s with step length of 50 milliseconds to counteract the time delayed by satellite transmission, completely realize the synchronization with central time.

· Separate output of time code. It can communicate with 100 secondary clocks at the same time beyond the distance of 1000 meters.

· Send time signals to work station and network by two RS232 connectors and provide time correction software.

· 6 strikes on the hour with high-quality voice of time announcement. Users can select from the two balanced XLR-type connectors as strike output, voice output or mixed output.

· Users can select striking on half the hour and advertisement before striking. In addition, the voice and advertisement can be recorded and downloaded.

· External GPS antenna is provided.

· 19-inch, 1U rack mounting frame, LCD screen, multi-display modes, Chinese menu and monitor listening output.

JD Secondary Clock

Functions:

· Receive time code from master clock, display time synchronously with the master clock.

· Selectable absolute standard time or before delay time.

· Type: on the wall, on the shelf and on the desk ; with date display and without date display.

· Size: 3-inch, 5-inch and 8-inch.

· Display color: Red, Green and Blue.

· Connection with master clock: Bus or Star.

· RS232 connector is provided to send time signals to work station nearby.

Time Adjustment Software

Functions:

· Contain server and client module installed on time correct sever and work stations respectively

· The server receives time code from master clock by RS232 connector and correct time accordingly

· All the work stations synchronize to correct time with the server by network communication

· The correction interval can be selected from 10min, 30min, 1hour, 1day or manual correction. The server can statistic the time correction status of all the work stations or mandatory synchronize with all the work stations

· Realization of time announcement by sound card

· Embedded server is to be developed. The master clock sends time signals to the network directly, without taking up PC as server