JPH031829Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is a case in which a radio wave direction finder is installed inside a bag-like case called an attachment case.

[Conventional technology]

Such a direction finder is well known, as disclosed in Japanese Utility Model Publication No. 28-9307, in which a receiver is provided within a case and a loop antenna is provided within the lid of the case.

[Problem that the invention attempts to solve]

In the direction finder described above, when the cover is closed, the loop antenna interferes with the metal object or circuit on the receiver panel, which changes the electrical characteristics of the loop antenna and prevents accurate direction finding. In addition, if you leave the cover open, such as when detecting the source of illegal radio waves, the other party (the person sending the illegal radio waves) will notice and you will never be able to accomplish your goal.

It is also well known that when the frequency of radio waves is particularly high, such as very short waves, an H-type adkotok antenna can be used instead of a loop antenna. It is true that the same problem as above will occur if the cover is closed, but even with the cover open, the arrangement of the H-type adkotok antennas is such that the two antennas on the bottom of each antenna are Since only one antenna element is close to the receiver, the electrical balance of the H-shaped adkotoku antenna itself is disrupted, making it useless for direction finding.

For this reason, in general, the H-type adkotok antenna is separated and connected to the receiver with a cable, a rod is attached to the center of the two antennas, and the rod is held in the hand and rotated to detect direction. However, with this structure, it is inconvenient to carry as it cannot be integrated into a compact size.In addition, in the case of detecting illegal radio waves, it is detected immediately and the purpose cannot be achieved. The problem is that it cannot be achieved.

[Means for solving problems]

This idea provides space in the front and rear parts of the case, places the receiver in the remaining part, and places one side of the H-type adkotok antenna in each of the front and rear spaces. The above problem can be solved by arranging the structure.

〔Example〕

Examples will be described below with reference to the drawings.

In this idea, the front, back, top, and bottom positions are
It refers to the position when a person lowers the direction finder and performs a detection action.

In Fig. 1, a case 1 made of an insulating material is a type of handbag usually called an attache case, and the material is made of an electrically insulating material such as plastic or paper, although it is not shown in the figure. ,
Except for parts that absolutely require metal, such as the lock, they are made of insulating material that has low moisture absorption.

The cover 2 and handle 3 of the case have the same structure as a normal handbag. In this invention, when referring to the front and back and top and bottom positions, it refers to the position when the handle 3 of the case 1 is held down by hand, that is, the longitudinal direction is the front and back direction. Therefore, the left-right direction in the figure corresponds to the front-back direction.

Elements 4-1 to 4-4 of the adkotoku type antenna are antennas for detecting the direction of radio waves provided inside each of the front and rear surfaces of the case 1.

The feeders 5-1 and 5-2 transfer the electric power induced in the above-mentioned elements to feeder introduction portions 7-1 and 7-2.
The operation of this wire will be explained with reference to FIG. 2.

Tuning dials 8-1 and 8-2 and knobs 9 such as switches are connected to the receiver 1 in the cabinet.
The output terminal 10 and the output meter 11 are used to monitor the audio and signal output of the receiver 12.

In FIG. 2, parts with the same numbers and symbols as in FIG. 1 have the same functions as in FIG. Matching circuit 13
is a circuit that efficiently adds induced power supplied through feeders 5-1 and 5-2 to receiver 12,
This is a balanced impedance transformer, and it consists of either a coil-based impedance transformer as shown in the figure or a balanced transistor amplifier.

Elements 4-1 to 4-4 are H as shown.
Since it forms an H-type adkostok antenna, that is, an H-type adkotok antenna, element 4
If the interval between -1 and 4-3 is selected to be shorter than the shortest wavelength of the received radio wave, the sensitivity to the received radio wave will have a so-called figure-eight directional characteristic. That is, by placing the case 1 so that the elements 4-1 to 4-4 match the polarization of the radio waves, and then rotating the case 1 with the handle 3,
The angle of minimum sensitivity can be determined from the above-mentioned figure 8-shaped directivity characteristic.

In order to match the angle of minimum sensitivity as much as possible with the arrival direction of the radio waves, the shapes and arrangement of the elements 4-1 to 4-4, the balance of the feeders 5-1 and 5-2, and the matching circuit 13, etc. Needless to say, it also has the functions necessary for detecting the direction of radio waves.

Therefore, as shown in the figure, the cabinet 6 is made smaller than the case 1 and placed at the center in the front-rear direction, and the feeders 5-1 and 5-2 are placed at the center in the vertical direction.

In other words, spaces are provided in the front and rear parts of the case 1, and the cabinet 6 is arranged in the remaining parts, and one side of each antenna of the H-type adco-stock antenna is placed in each of the space parts of the front and rear parts. The structure is such that the cabinet 6 of the receiver 12 is placed in the center of each antenna.

The angle of minimum sensitivity can be detected by listening to the audio appearing on the output terminal 10 or by monitoring the deflection of the output meter 11.
To this end, the output meter 11 must be easily monitored from outside the case 1, and the output terminal 10
In addition to being able to connect earphones to the case 1, it is also desirable to be able to make fine adjustments to the tuning dial 8-2 from outside the case 1. Insulation shaft 1
4 is to prevent the tuning mechanism of the receiver 12 in the cabinet 6 from being exposed in order to prevent radio waves from entering through the tuning dial 8-2. The cord 15 is an electric wire that transmits audio and the like to the output terminal 10, but it is preferable to use an electric wire that includes a resistor in order to attenuate the intrusion of radio waves from here.

Battery 16 powers receiver 12 .

As explained above, since the present invention measures the direction of radio waves, in addition to means for minimizing the intrusion of radio waves from the cabinet 6, the cabinet 6 should be as small as possible and the element 4 should be as small as possible.
It is important to create a shape that is balanced between -1 and 4-4.

Since the present invention is configured as described above, it is possible to provide an ultra-high frequency radio wave direction finder that has the appearance of a handbag.

[Effect of idea]

According to this idea, as mentioned above, spaces are provided in the front and rear parts of the case and the receiver is placed.
In each of the front and rear spaces, one antenna of the H-type Adkotoku antenna is placed inside the case, so opening and closing the cover changes the placement relationship between the receiver and the loop antenna. Therefore, you can make necessary adjustments to the receiver, such as adjusting the tuning dial, so that it can receive radio waves, connect a small earphone to the output terminal 10 and insert it into your ear, and listen to the received sound. Direction can be detected by observing the deflection of the output meter 11.

Therefore, since detection operations can be performed with the cover closed, it is possible to easily approach very close to the emission point without being noticed by the illegal person who is emitting illegal radio waves.

In addition, even if you pass a person or structure during detection, each operating part of the receiver is protected by a closed cover, so each operating part will touch them and the receiver will be unable to adjust the reception settings. It has the advantage of eliminating accidents that could result in the various conditions being compromised.

[Brief explanation of the drawing]

FIG. 1 shows a perspective view of the invention. Figure 2 shows
The circuit of the antenna of this invention is shown. DESCRIPTION OF SYMBOLS 1... Case made of insulating material, 2... Cover of case, 3... Hanging hand, 4-1 to 4-4... Element of adkotok type antenna, 5-1, 5-2
...Feeder, 6...Cabinet of conductive material, 7
-1, 7-2...Feeder introduction, 8-1, 8
-2... Tuning dial, 9... Knobs such as switches, 10... Output terminal, 11... Output meter, 12... Receiver, 13... Matching circuit, 14
...Insulating material shaft, 15...Cord, 16...
…battery.

Claims (1)

[Scope of Claim for Utility Model Registration] A radio wave direction finder comprising a case and a cover made of insulating material, and a direction finding antenna and a receiver housed in a bag-like case that can be carried by a person, comprising: a. The case is arranged with spaces provided at least in the front and rear parts, and is enclosed in a cabinet made of conductive material, and includes at least an operating part for tuning to the frequency of radio waves and for monitoring the electric power amplified by the radio waves. the receiver provided with a meter part or an output terminal part for listening to the audio and signals of the radio waves; b) an antenna on each one side of an H-type adkotok antenna in each of the front and rear spatial parts; c) a means for operating and monitoring the operating part and the meter part or the output terminal part provided in the bag-like case while the bag-like case is closed; A direction finder featuring: