JPH05218911A - Superimposing signal monitoring device - Google Patents

Abstract

PURPOSE:To easily monitor the presence of a high frequency signal with a miniaturized device by providing an input/output connector section, a DC voltage blocking section, a frequency detection section, a display section displaying only the presence of a superimposing signal being the result of detection and a power supply section. CONSTITUTION:A cable for monitoring a superimposing signal is connected to two input/output connectors 4 independently of the direction of the signal. The monitoring device is provided with a power supply section 5 separating a required power from the conductor of a coaxial cable, and extracts a DC through a choke coil having a high input impedance to a high frequency signal to be monitored and giving no influence onto the signal and supplies power to each section. On the other hand, only a high frequency signal is separated from the high frequency signal to be monitored by a DC blocking section 1 coupled with the conductor and led to a signal detection section by frequency classifications 2. The detection section 2 detects whether or not the level of the signal at every frequency of the high frequency signal to be monitored is a prescribed level or above. The result is displayed on a display section 3 and the presence of the signal at every superimposed frequency signal is visually observed to monitor the signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superimposed signal monitoring device, and more particularly to a superimposed signal monitoring device having a function of monitoring and simply displaying a DC voltage and a high frequency signal superimposed in a coaxial cable.

[0002]

2. Description of the Related Art A conventional monitor device for a signal superimposed on a coaxial cable has a direct-current connection to a coaxial core wire connected to an input / output connector 4 as shown in the configuration diagram of FIG. 3 and the external view of FIG. A monitor signal is output to the signal monitor connector 6 via a DC blocking unit 11 such as a capacitor that blocks a voltage and extracts only a high frequency signal, and a spectrum analyzer, which is a type of FFT analyzer, is connected and monitoring is performed by the combination. It was

[0003]

Since this conventional superposed signal monitoring device is a system in which an external monitoring device itself is connected to a connector, its high frequency signal is known, and moreover, it is only for confirming the presence or absence of the signal. I always needed an expensive spectrum analyzer. In addition, it is difficult to secure a place for installing the spectrum analyzer when it is used outdoors or at a high place.

[0004]

SUMMARY OF THE INVENTION A superposed signal monitoring apparatus of the present invention includes an input / output connector section for connecting a coaxial cable, a DC voltage blocking section for extracting a plurality of superposed signals by coupling them to a core wire of the coaxial cable, and the superposed section. A plurality of frequency detection units for detecting signals by frequency of the signal, a display unit for displaying only the presence or absence of a superposed signal of the detection results, a power supply unit coupled to the coaxial core wire to extract power from the DC voltage Is equipped with.

[0005]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an external view of the present invention. In FIG. 1, a cable for monitoring the superimposed signal is connected to the two input / output connectors 4 regardless of the direction of the signal. Here, there is a power supply unit 5 that separates the power supply required for the operation of the present monitoring device from the coaxial core wire, and through a choke coil or the like that has a high input impedance and does not affect the high frequency signal to be monitored. DC is taken out to supply power to each part described later. On the other hand, with respect to the high frequency signal to be monitored, only the high frequency signal is separated by the DC blocking unit 1 coupled to the core wire and guided to the frequency-dependent signal detection unit 2.

The frequency-specific signal detector 2 detects, for each frequency of the high-frequency signal to be monitored, whether or not the level of the high-frequency signal exceeds a certain level.

The detected result is displayed on the display unit 3, and it is possible to monitor the presence or absence of a signal for each superimposed frequency by visually observing.

As shown in the external view of FIG. 2, for example, 5 MH
The presence or absence of a high-frequency signal such as z, 10 MHz, and 27 MHz to be visually checked can be visually checked on a display unit such as an LED.

[0009]

As described above, according to the present invention, when it is desired to monitor only the presence or absence of a superimposed high frequency signal, it is not necessary to externally supply power as a monitor device.
Compared with the conventional method using an expensive spectrum analyzer as in the conventional example, it is simpler, smaller in size and lighter in weight, and does not require selection of the installation location.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an external view of the present embodiment.

FIG. 3 is a block diagram of an adapter of a conventional superimposed signal monitoring device.

FIG. 4 is an external view of a conventional example.

[Explanation of symbols]

 1, 11 DC blocking unit 2 Frequency-dependent signal detection unit 3 Display unit 4 Input / output connector 5 Power supply unit 6 Signal monitor connector

Claims (1)

[Claims] 1. An input / output connector section for connecting a coaxial cable, a DC voltage blocking section for extracting a plurality of superimposed signals by coupling them to a core wire of the coaxial cable, and a plurality of frequencies for detecting signals of each frequency of the superimposed signal. A superposed signal monitor including a detection unit, a display unit that displays only the presence or absence of a superposed signal of the detection results, and a power supply unit that is connected to the coaxial core and extracts power from the DC voltage thereof. apparatus.