What is a Radio Controlled Clock
Radio controlled clocks, also known as wireless controlled clock, is a new generation of high-tech products after quartz electronic clocks.
Radio controlled clock is in the basic of quartz electronic clock and electronic clock, add the receiving radio carrier signal, data processing, automatic correction of the functional structure. So you can receive the ground station in standard time signal sent by a carrier, radio controlled clocks is received only after this precise code, the data processing, can automatic correction wave traveltime error of clocks and watches, and make every walking only waves clock controlled by unified precision when the code, so as to realize the measurement of all the waves clock precision time and show the consistency of the time.
Principle of radio clock technology system
First, the standard time signal is encoded by the standard time timing center (commercial code is encrypted), and the time signal is sent out by radio long wave using low frequency (20KHz~80KHz) carrier mode.
The radio controlled clock receives the low-frequency radio time code signal through the built-in miniature radio receiving system, the time code signal is demodulated by the special integrated chip, and the clock's time is automatically adjusted by the control mechanism set in the timing device.
Through such a technical process, all clocks (or other timing devices) receiving the standard time signal are highly synchronized with the standard time of the standard time timing center, so that all radio controlled clocks display strictly consistent time.
Working principle of timing signal transmission
The transmitting part composed of time signal consists of atomic clock, time signal processor, modulator, carrier oscillator, excitation stage, intensity amplifier and transmitting antenna.
Emission principle As the clock source, the atomic clock generates relatively accurate and stable time-frequency standard, which can obtain real-time standard time information through the system frequency divider.Such as: year, month, day, hours, minutes, seconds, milliseconds, subtle information such as time, this time information from the time information processor, to encrypt code transformation and signal processing, such as the formation of standard timing signal, then the timing signal to the modulator, a high frequency carrier modulation modulation signal through the exciter with certain incentives to motivate power transmitter high activity level, tens of kilowatts of power generated by the high activity level fire radio waves into space.
Low frequency time code transmitters in different countries transmit time code signals at different frequencies.(e.g. USA, time code WWVB, frequency 60KHz;Germany, time code DCF, frequency 77.5khz;In the United Kingdom, the time code is MSF and the frequency is 60 KHz.Two Japanese stations, time code JJY, with frequency of 40 KHz and 60 KHz respectively;China, time code BPC, frequency 68.5khz)
How time signal reception works
The time signal receiver (i.e., radio clock and watch) composed of elements is mainly composed of receiving antenna, preamplifier, tuning amplifier, automatic gain circuit, filter, demodulator, square waveform generator, time information processor, functional controller and display. Its functional principle is as follows:
Receive principle as the receiver of the waves the receiving antenna of the clock from the space induction receive real-time GPS clock signal timing center launched, due to the weak signal, passes through the front-end amplifiers, possible amplifier output to the tuned amplifier with frequency selective amplifier, then filtering, the waveform shaper for plastic, after filtering, and then to detection tuning, time signal extracted from the carrier, namely a series of regular pulse, the pulse transform to receiving signal processor, and time after reduction to monitor for display, respectively.
The function controller sets the functions, such as alarm, time, temperature, humidity, voice, countdown, time display, etc.
