JPS59169231A - Fm repeating device - Google Patents

Abstract

PURPOSE:To improve the reliability of a repeating device by having the synchronism between local oscillation signals of using and spare systems on the basis of the output a prescribed reference oscillator and therefore synthesizing and delivering the output signals of each transmission part to prevent a short break due to the switching of a relay. CONSTITUTION:A high frequency reception input signal f1 is supplied to FM repeaters 2 and 3 of the currently using and spare systems respectively from a high frequency distributor 1. Then high frequency transmission output signals f2 and f3 are delivered via a reception part 11 and a transmission part 12. The reference signal of a reference signal generator 17 is supplied to the parts 11 of repeaters 2 and 3, reception local oscillators 13' and 15' of the part 12 and transmission local oscillators 14' and 16' respectively. The synchronism is obtained by the output of the generator 17 among the oscillation signals of those oscillators 13', 15', 14' and 16' respectively. Then an output signal f2 given from the repeater 2 is applied to a synthesizer 5 via a phase shifter 6 and synthesized with the output signal f3 of the repeater 3. Then f2=f3 is satisfied to prevent a short break due to the switching of a relay.

Description

[Detailed Description of the Invention] The present invention is an FM system that combines the output parts of two active and standby repeaters.
This relates to a relay device.

Conventionally, this type of FM repeater has used a coaxial relay or the like to switch the high frequency outputs of a No. 1 system and a No. 2 system, which are active and standby systems, as shown in No. 1-. That is, the high frequency input signal fl is distributed by the distributor l to the L1 FM relay WA2 and the No. 2 FM repeater 3, and in the I FM repeater, the output from the receiving station 13 and the distribution output from the distribution Rx are divided. is mixed and amplified in the receiving section 11, and converted into an intermediate frequency signal (hereinafter abbreviated as IF multiplied signal) IFl. Further, in the transmitting section 12, this IFI signal and the output signal from the transmitting station are mixed and amplified, and converted into a high frequency output signal f2. On the other hand, in the FM repeater 2 of the No. 2 system, the high frequency input signal f1 is similarly converted into the high frequency output signal f3. Here, the high frequency output signal f2. f3 is from the 1st station (1
3, 14) and the No. 2 system oscillator (15, 16), a slight difference in wave number occurs, but when used as an FM repeater, the frequency is completely negligible in practical terms. It's a difference. High frequency output signal f2. obtained in this way. f3 was switched by the coaxial relay 4 and used as the output of the FM repeater.

In this way, in the conventional system with two working and standby units, each output of the No. 1 and No. 2 FM repeaters is switched by a coaxial relay, so the reliability of the coaxial relay is affected by momentary interruptions in the high frequency output when switching. This had the disadvantage that the reliability of the entire relay device decreased because of the low value.

An object of the present invention is to eliminate such drawbacks, provide an FM repeater consisting of two units, a working unit and a standby unit, which has high reliability and does not cause momentary interruptions during switching.

The configuration of the FM repeater of the present invention includes a receiving section that converts a high frequency input into an intermediate frequency signal using a receiving local oscillation signal, and a transmitting section that converts the output intermediate frequency signal of this receiving section into a high frequency output using a transmitting local oscillation signal. In the FM repeater, each of the local oscillation signals is formed as a synchronized signal based on the output signal of a predetermined reference oscillator, and the output signals of the respective transmitters are combined. It is characterized by being output.

The present invention focuses on the fact that by synchronizing the working and standby local oscillation signals, the outputs of the working and standby FM repeaters have exactly the same frequency.

The present invention will be explained in detail below with reference to the drawings.

FIG. 2 is a block diagram of an embodiment of the invention.

In this figure, the difference from the conventional configuration is that the receiving station transmitter (lgi,
ff) and the transmitting station (14', 1σ) are configured to generate a signal synchronized with the reference signal generator 17. Therefore, each output signal f of No. 1 and No. 2 FM repeater
2. fl has the same frequency. These 1 and 2
If there is a phase difference between the output signals of the No. FM repeater, this can be done by inserting a phase shifter 6 in one of the paths as necessary.

The output phase of each FM repeater can also be made the same. The respective output signals 2°fl obtained in this way are combined by a combiner 5 and can be outputted from the FM repeater.

FIG. 3 is a block diagram of a second embodiment of the present invention;
The case where two reference signal generators 18 and 19 are used is shown.

That is, the output of the reference signal generator 18 for the receiving station of the No. 1 FM repeater 2 is used as the reference signal for the receiving station 14' of the No. 2 FM repeater 3, and Departure 14! By using the output of the reference signal generator 19 as the reference signal for lσ from the transmitting station of the No. 2 FM repeater 3, each output frequency and valley of the No. 1 and No. 2 FM repeaters can be adjusted similarly to the first embodiment. It is possible to make the phases the same.

As explained above, according to the present invention, the respective outputs of the No. 1 and No. 2 FM repeaters are combined and used as the output of the FM repeater, so the reliability of the device is improved compared to the conventional switching method using relays. However, instantaneous interruptions due to switching do not occur. Furthermore, conventional FM repeaters that use SHF waves require expensive power amplifiers to obtain high output power, but according to the configuration of the present invention, the output power of each FM repeater is equal to the rated power of the FM repeater. It is possible to provide a low-cost device with only half the output.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional FM repeater, Figures 2 and 3
The figure is a block diagram of the first and second embodiments of the present invention. In the figure, fl...High frequency reception input signal * fL f
l...High frequency transmission output signal, l...--High frequency distributor, 2,3...FM repeater, 4...
...Coaxial switch, 5...Synthesizer, 6...
...Phase shifter, 11... Receiving section, 12...
- Transmission unit, 13. iza, 15...Local oscillator for reception, 14, 14. 16... Transmission local oscillator, 17゜18.19... Reference signal generator,
It is.

Claims (1)

[Claims] A receiving section that converts a high frequency input into a p medium frequency signal using a receiving local oscillation signal and a transmitting section that converts the output intermediate frequency signal of this receiving section into a high frequency output using a transmitting local oscillation signal are used as a working device and a standby device, respectively. In the FM repeater, each of the local oscillation signals is formed as a synchronized signal based on the output signal of a predetermined reference oscillator, and the output signals of each of the transmitting sections are combined and output. F
M relay device.