JPH0216618B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tuning method for a wireless communication device such as a receiver or a transceiver.

[Conventional technology]

Conventionally, the tuning means for high-frequency circuits in wireless communication devices was adjusted by turning a tuning knob so that the S meter pointer showed the maximum deflection, but depending on the radio wave format, FM signals etc. Although it can be adjusted
For AM signals, SSB, and CW, the input signal fluctuates greatly and constantly, making it difficult to accurately adjust to the maximum value and having to rely on the operator's intuition. Further, even if the motor can be rotated in forward and reverse directions using a control signal, it often takes a long time to complete the adjustment.

[Problem to be solved by the invention]

An object of the present invention is to provide a method that eliminates the troublesome adjustment to fluctuations in received signals as described above and allows accurate tuning in a short time.

[Means to solve the problem]

In a receiver that rotates a motor using a control circuit signal and tunes a high-frequency circuit by rotating and matching a variable capacitor or variable inductance, the antenna and speaker are once connected from the high-frequency tuning circuit and the receiving output circuit using a relay or diode switch. It is separated and connected to a noise generator, and the relatively stable level of noise from the noise generator is used to control the variable capacitor or variable inductance coil of the high frequency tuning circuit using the control signal obtained by detecting the output of the receiving circuit. A tuning method that adjusts the rotation using a motor that can rotate forward and backward, and automatically restores the antenna side and audio circuit when matching is completed.

〔Example〕

FIG. 1 shows one embodiment of the present invention, and the drawing will be explained below.

In the figure, the antenna 1 is connected to the movable contact a of the switching relay 2, the noise generator 6 is connected to the other movable contact c, and the fixed contact c is connected to the variable capacitor VC and variable inductance coil L of the reception front end. The tuned circuit 3 is connected.

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

On the other hand, the other output side of the receiving circuit 4 is connected to a control circuit 7, and a motor 8 capable of forward and reverse rotation and a push button switch 9 are connected to the control circuit 7, respectively.
The output side is connected to the noise generator and the drive coil of the switching relay 2.

A motor 8 capable of forward and reverse rotation is connected to a rotating shaft of a variable capacitor VC of the tuning circuit 3.

In this case, the variable inductance coil L is made variable instead of the variable capacitor VC, and the motor 8
May be concatenated with

Here, the noise generator 6 will be explained. Most common noise generators use a Zener diode.

The generated white noise is output up to high frequencies at a relatively flat level. Figure 2 shows a standard noise generator using a Zener diode ZD. If the output signal is weak, it is amplified by a transistor Tr as shown in the figure. When inputting noise generated from a high frequency amplification stage as in the present invention, a Zener diode ZD is used.
The output of is sufficient.

In the wireless communication device configured in this manner, when the tuning is established and the movable contact a and the fixed contact c and the fixed contact d and the movable contact e of the switching relay 2 are closed, respectively, The signal radio wave received by the antenna 1 is supplied to the tuning circuit 3, passes through the receiving circuit 4, and reaches the speaker circuit 5.
Make the speaker sound.

Next, when the band switching switch (not shown) provided on the panel is switched to another band, or when the push button switch 9 is pressed, the movable contact a of the switching relay 2 changes to the movable contact b, and the movable contact e changes to the movable contact. Contact f
The antenna 1 and the speaker circuit 5 are respectively disconnected from the tuning circuit 3 and the receiving circuit 4, and the noise generator 6 is connected to the tuning circuit 3, and at the same time, power is applied to the noise generator 6. white noise.

Therefore, a noise output such as white noise with flat characteristics is applied from the noise generator 6 to the tuning circuit 3, and the output is supplied to the receiving circuit.

The control circuit 7 A/D converts the DC voltage according to the signal strength from the receiving circuit 4, and the motor 8, which can rotate in either the forward or reverse direction, is rotated in the forward or reverse direction so that the digital signal is maximized. The motor 8 rotates the variable capacitor VC, which is a variable element of the tuning circuit 3, in the forward direction or in the reverse direction for adjustment.

During this time, since the switching relay 2 is switched downward, the fixed contact d is in contact with the movable contact f, and the speaker circuit is disconnected, so that no unpleasant noise is generated due to noise from the noise generator 6.

〔Effect of the invention〕

The present invention allows rotation in either the forward or reverse direction with a relatively flat noise with characteristics similar to white noise from a noise generator by an extremely simple operation of switching the band selection switch or pressing the adjustment selection push button switch. With this motor, the tuning circuit can be automatically and accurately and quickly adjusted to achieve tuning, and the speaker can be matched without generating unpleasant sounds such as noise.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a tuning system for a wireless communication device showing one embodiment of the present invention, and FIG. 2 is a noise generator using a Zener diode. 1... Antenna, 2... Switching relay, 3... Tuning circuit, 4... Receiving circuit, 5... Speaker circuit,
6... Noise generator, 7... Control circuit, 8...
...Motor capable of forward and reverse rotation, 9...Push button switch.

Claims (1)

[Claims] 1. Noise is generated in the entire reception frequency band in a motor that can be rotated in forward and reverse directions by varying the variable capacitor or variable inductance that tunes the high-frequency circuit, and in the receiver that outputs the drive signal for the motor from the control circuit and adjusts it. a switch for selecting reception or tuning; and switching means for switching the antenna to the noise generator and turning off audio output when the switch selects tuning, and when the switch selects tuning, , the noise generator is switched from the antenna side, and the forward and reverse rotatable motor is controlled by a signal from the control circuit so that the output amplification degree of the noise generator is maximized with respect to a local oscillation frequency corresponding to a desired receiving frequency. Driving and matching high frequency circuits,
1. A tuning method for a wireless communication device, characterized in that audio output is cut off during matching, and when matching is completed, the switching means is restored and the noise generator is switched to the antenna side, and the audio circuit is also restored.