CS210935B1 - Circuit for transmission of pilot's frequency determined for synchronization of mass remote control transmitters - Google Patents

Description

(54) Pilot frequency connection for synchronization of mass remote control transmitters

The present invention relates to a pilot frequency transmission circuit for synchronizing mass-length transmitters used in power engineering to transmit tone frequency pulses to electrical networks for the purpose of controlling and regulating power consumption.

The hitherto known circuitry, enabling the transmission of pilot frequencies through a low bandwidth channel, utilizes specially designed channels with amplitude modulation. This solution is expensive because it is necessary to modulate the subharmonic frequency of the pilot frequency to the channel carrier frequency. A further disadvantage is that the bandwidth required for transmission is twice the subharmonic frequency.

These drawbacks are substantially alleviated by the pilot frequency wiring for synchronization of the bulk remote control transmitters of the present invention. Its essence is that the transmitting side is connected to the receiving side by a connection path. The pilot frequency output from the frequency divider of the receiving side is connected to a mass remote control transmitter.

An oscillator frequency conductor from the transmitting side is connected to a parallel connected output to transmit the pilot frequency to the second station to the output to transmit the pilot frequency to the nth station. In the transmitting side, the bulk remote control unit and the oscillator unit are connected by an oscillator frequency conductor to the transmitting filter.

The receiver side is connected in series with the receiver filter, phase lock and frequency divider.

The advantage of the circuitry according to the invention is that it enables the transmission of a pilot frequency with low bandwidth requirements by using an unmodulated carrier frequency for synchronization. The necessary transmission devices are less expensive and require less bandwidth.

An example of a pilot frequency wiring for synchronization of mass remote control transmitters is illustrated in the block diagram of the attached drawing.

On the transmitting side 4, the bulk remote control unit J and the oscillator unit axis 8 are connected to an oscillator unit 4 by means of an oscillator frequency conductor 12 connected to a transmitting filter J. The oscillator frequency conductor 12 is further connected to a parallel output output 6 the pilot frequency to the second station up to the output 8 for transmitting the pilot frequency to the nth station. The transmitting side of the transmitting side 8 is connected to the receiving side filter 8 of the receiving side 4 by the connection path 13. In the receiving side 8, the receiving filter 8, the phase lock and the frequency divider 10 are connected in series. Out of the receiver side 2, a pilot frequency output 11 connected to a mass remote control transmitter 14 connected to an electric power 15 is led out of it.

Any frequency band reserved by the CCITT Recommendation for Telegraph Channels can be used for pilot frequency transmission. The oscillator frequency, which is a multiple of the pilot frequency, is selected to fall within the frequency range reserved for the selected telegraph channel and, after multiplying by the phase lock J and divided by the frequency divider 60, to give just the pilot frequency. Here, p - r p p 'k' holds where f _QSC is the oscillator frequency f is the pilot frequency k is the multiplication constant of the phase lock £ and 1 is the dividing ratio of the frequency divider 0 0.

The pilot frequency is transmitted permanently and serves for phase synchronization of the bulk remote control transmitters 14, as a rule, when operating in galvanically connected electrical networks 15. The bulk remote control transmitters 14 are controlled from the bulk remote control unit J via an independent connection path.

Claims (1)

SUBJECT OF THE INVENTION Pilot frequency transmission circuitry for synchronizing mass remote control transmitters, characterized in that the pilot frequency output (11) from the frequency divider (10) of the receiving side (2) is connected to a mass remote control transmitter (14) and a wire (12) for the oscillator frequency from the transmitting side (1) is connected to a parallel connected output py (6 to 7) for transmitting the pilot frequency to the second to n th station, wherein in the transmitting side (1) there is a central automatic block (3) of bulk remote control; the oscillator units (4) connected by an oscillator frequency conductor (12) to the transmitting filter (5) and in the receiving side (2) are connected in series the receiving filter (8), the phase lock (9) and the frequency divider (10).