Sertel Electronics Private Limited

Display the same time in a number of locations irrespective of the distance. Provide time related signals to synchronise the time of microprocessor based clock system. Transmission of time data is not affected by noise or fluctuations in power supply etc. The central clock can be synchronised with IST UTC by monitoring by STFS Decoder GPS Receiver. Built in Reserve Power keeps the central clocks operational in case of power outages,whereas satellite clocks get synchronised with the central clock immediately after powering.

Designed for high accuracy time synchronisation and frequency calibration using standard Time and Frequency signals propagated by National Physical Laboratory through INSAT satellite. This microprocessor based system is fully automatic in operation and requires minimum amount of operator involvement. This low powered device is powered simultaneously by 220V AC and 24V Dc to ensure uninterrupted operation in the event of mains failure. In addition to time display 1ST , this equipment provides the following outputs :

1. 1PPS TTL level pulse output sychronised to NPL Time Standard within 20 microseconds to provide time synchronisation and clock calibration.
2. 1MHz 5V TTL frequency output phase locked to the received signal with an accuracy of 10-9 for frequency calibration.

SERTEL GPS receiver is a specialised equipment for Time Synchronisation and clock calibration. It receives the signals from GPS Satellites and outputs a time based pulse 1 PPS every second in precise synchornisation with UTC. Each 1PPS pulse is accompanied by a serial Data Packet output a real time data comprising of year, month, day, hour, minute and second which is a time stamp for that pulse. This cost effective system provides stable 1PPS signals even when switching satellites due to concurrent processing of 8 channel data.
Application :

1. Time Base synchronisation among broad casting stations, telephone exchanges, etc.
2. Systems in which precise time stamping is vital such as Power Generation and Distribution , Seismometering etc.
3. Networking system is which time synchronisation among nodes is important. Successfully conducted a type test from M/s Sameer for GPS and Masterclock along with power supply as per the following: