JPS58225717A - Tuning system of radio communication device - Google Patents

Abstract

PURPOSE:To perform accurate, speedy tuning automatically, by disconnecting an antenna and a speaker from a tuning and a receiving circuit for the tuning, supplying a relatively stable noise from a noise generator, and performing an accurate, speedy adjustment so that the noise output from the receiving circuit is maximized. CONSTITUTION:When a push-button switch 10 is pressed for maximizing tuning, a changeover relay 2 is placed at the lower side, a white noise having flat characteristics is generated by the noise generator 9 and applied to the tuning circuit 3 through the movable contact (b) and fixed contact (c) of the changeover relay 2, and a DC voltage corresponding to the intensity of a signal is sent out to an A/D converter 6. The sent DC voltage is converted by the A/D converter 6 into a digital numeral, which is supplied to an arithmetic circuit 7 to obtain (n) binary or BVD codes; and they are converted by a D/A converter 8 into an analog signal voltage, which is applied to the voltage varactor element VC of the tuning circuit 3. The tuning operation is completed automatically at a maximum point and the fixed contacts (c) and (f) of the changeover relay 2 are connected to the movable contacts (a) and (d) respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tuning method for a tuning circuit in a radio communication device such as a receiver or a transistor.

Conventionally, the tuning method for wireless communication equipment was to adjust the S meter pointer to the maximum value by turning a tuning knob, but since the S meter pointer constantly fluctuates, it could be adjusted accurately and quickly to the maximum point. It was difficult to match the value, and the operator had to rely on his or her intuition.

The present invention has been made in order to solve this problem, and when performing tuning, the antenna and speaker are first separated from the tuning circuit and the receiving circuit using a changeover switch, and the noise Supplying relatively stable noise from the generator, the voltage variable capacitor or voltage variable inductor of the tuned circuit can be used for converters, arithmetic circuits, and D/
It is an object of the present invention to provide a tuning method for a wireless communication device that accurately and quickly adjusts the noise output from a receiving circuit using a control circuit including an A converter or the like to maximize the noise output.

An embodiment of the present invention will be described in detail below with reference to the drawings.

In the figure, antenna terminal 1 has an antenna (not shown).
and connect it to the movable contact a of the switching relay 2,
Fixed contact C is a tuning circuit 3 consisting of an inductance transformer ML for coupling the reception tuning circuit and a voltage variable capacitance element VC.
Connect to.

Is capacitor CI + C2 A? In the sccon, the coil RFC is for rectification.

The output side of the tuning circuit 3 is connected to the movable contact d of the switching relay 2 via the receiving circuit 4, and the fixed contact f is connected to the speaker 5.

The other output side of the receiving circuit 4 is connected to the A/1) converter 5, and the converter 6 is connected in series to the arithmetic circuit 7 and the D/A converter 8. The output side of is connected to the voltage variable capacitance element VC of the tuning circuit 3 via the coil RFC.

Further, a push button switch 10 for starting is connected to the arithmetic circuit 7, and a noise generator 9 is connected to the movable contact of the switching relay 2.

Here, instead of the voltage variable capacitance element VC of the tuning circuit 3, the secondary side of the coupling inductance transformer ML may be replaced with a voltage variable inductor, or a separate voltage variable inductor may be inserted.

Since the wireless communication device of the present invention is configured as described above,
The arriving signal radio waves are transmitted from the antenna (not shown) through the antenna terminal 1, the movable contact a and the fixed contact C of the switching relay 2, and then the tuning circuit 3, the receiving circuit 4, and the movable contact d and the fixed contact f of the switching relay 2. It passes through to speaker 5 and makes it sound. Next, in order to maximize the synchronization, when the push button switch 1o is pressed, the switching relay 2 falls down, and the flat white noise generated from the noise generator 9 is fixed by the movable contact of the switching relay 2. It is applied to the tuning circuit 3 through the contact C, and is further supplied to the receiving circuit, where it collects a DC voltage corresponding to the strength of the signal and sends it to the converter 6.

The sent DC voltage is converted into a digital value by the Φ converter 6 and supplied to the arithmetic circuit 7, and the arithmetic circuit 7 converts it into an analog signal voltage by the D/A converter 8 as n binary or BCD codes. and is added to the voltage variable capacitance element VC of the synchronous circuit 3.

In other words, the arithmetic circuit 7 changes the n binary or BCD codes so that the white noise from the noise generator 9 can be received most strongly.

When the maximum point is reached, the chewing operation is automatically terminated, and the fixed line points C and f of the switching relay 2 are connected to the movable contacts a and d, respectively.

Note that, until then, the movable contact d and fixed contact f of the switching relay 2 are disconnected, so that no unpleasant sound due to white noise is generated from the speaker 5.

As described in detail above, the synchronization method of the present invention can automatically and accurately achieve synchronization quickly by pressing the push button switch, and during this time, the unpleasant noise due to noise from the power source is generated. Accordingly, it is possible to provide a tuning method for a wireless communication device that does not generate noise.

[Brief explanation of the drawing]

The figure is a block diagram of a tuning system for a wireless communication device showing an embodiment of the present invention. 1...Antenna terminal, 2...Switching relay, 3...
Tuning circuit, 4... Receiving circuit, 5... Speaker, 6.
Converter, 7 Arithmetic circuit, 8 D/A converter, 9 Noise generator, 10 Push button switch. Patent applicant: Shigesu Musen Co., Ltd., 4 companies (5)

Claims (1)

[Claims] By operating a switch on the panel, the sound from the receiver's speaker is cut off, and the receiver's antenna input is disconnected from the antenna and connected to the noise generator, so that the noise output of the receiving circuit is maximized. A tuning method for a wireless communication device, characterized in that a voltage variable capacitance element or a voltage variable inductor of a tuning circuit is automatically adjusted by an output from a control circuit comprising a digital converter, an arithmetic circuit, a D/A converter, etc. .