JPS60216631A - Mca radio communication equipment - Google Patents

Abstract

PURPOSE:To attain easily operating tests such as a test for a fault state by preserving a faulty state of an electromagnetic latch relay and allowing a relay contact to interrupt directly a power supply. CONSTITUTION:Faulty durated transmission is detected by a signal transmitted to an OR circuit 17. The signal is sampled and the duration time of transmission is counted analogically. When a prescribed time is elapsed, PUTs Q1, Q2 are turned on and a magnetic latch relay 24 is excited. Thus, a reference potential point connected to a power supply -B is cut off and the transmission is stopped. When the transmission is stopped, the PUT Q1, Q2 are restored and the exciting current is also interrupted. The electromagnetic latch relay is restored by applying a nagative pulse from a test point 25 through the use of a demagnetizing pulse generator in this state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an MCA wireless communication device, and particularly to an MCA wireless communication device configured to prevent abnormal continuous transmission in order to protect an MCA system.

[Technical background of the invention and its problems]

As shown in Figure 1, a conventional MCA wireless communication device uses a CPU.
15, ROM 16, and PLL circuit 13 are provided.

MCA system is 800MH! The band is divided into 25 blocks, and each unit block consists of one control channel line and 15 communication channels (the final block is 14 lines). The unit block has an MCA that controls the MCA.
A relay station will be provided. 1 centered around this MCA relay station
A wireless zone with a radius of 5 to 251 m is created. A group of subscribers receiving the service has a subscriber station consisting of a command station, a mobile station, etc., and each subscriber station is equipped with an MCA wireless communication device. The number of communication channels allowed per unit block is 4.
~15 channels, accommodating 1000 to 60 subscriber stations
00, Number of calls per hour: 0.5, Average holding time: 20 seconds, 1
It operates on 5 channels and 14 erlangs of waiting calls.

A unit block accommodates multiple subscriber groups, and each subscriber group can only use one channel at a time, and calls can only be made between subscriber stations belonging to the same licensee.
Each call is limited to 60 seconds. The MCA relay station is the upper station, and the lower frame synchronization signal is sent out as time slot information. Access from a subscriber station sends out a control signal in synchronization with an arbitrary time slot. (This method is called a time slot random access method.) In the MCA system, an MCA relay station controls originating and terminating subscriber stations via a lower control channel. The data in the ROM 16 is transmitted to the MCA relay station via the upper control channel, and operations are performed according to the MCA system usage method determined for each subscriber group.

In the MCA system, the MCA relay station cooperates with the CPU 15 of the subscriber station to provide protection for the MCA system, such as by setting up an alternative control channel in the event of a control channel failure. This protection includes a sb forced transmission stop function for the continuous transmission state of the subscriber station, which stops transmission within 120 seconds, and also requires that the stop of transmission cannot be canceled by an operation from outside the national body due to a power cut, etc. It is considered a mandatory requirement. To detect abnormalities, prevent accidents that often occur due to abnormalities, and preserve the prevented state, use a no-fuse breaker, cut off the circuit by wiring logic due to fuse blowing, resistance burnout, etc., or FROM, magnetic There are functions that are stopped by program logic using non-volatile memory such as waist memory, and furthermore, by a combination of wiring logic and program logic.

Since transmission control is executed by program logic, CPU 1
6 goes down, transmission is cut off. If the execution of the program logic becomes maze during transmission control, an abnormal transmission will occur. Although abnormal transmission is detected via the I10 buffer, it is not possible to configure program logic for detecting abnormal transmission in the CPU 16, which has already become maze. usually,
In this case, there is no other way than to prepare a spare CPU 16.

No-fuse breakers have the disadvantage of low mechanical reliability. The use of fuses makes it difficult to perform operational tests during birth inspection, and the reliability of the contact parts is low with tube fuses that are not screwed.

[Purpose of the invention]

An object of the present invention is to provide an MCA wireless communication device that prevents the recurrence of abnormal transmission through the operation and state preservation of an electromagnetic latch relay, and that can reliably protect the MCA system from impurities.

[Key points of the invention]

The present invention provides an electromagnetic latch relay excitation means for exciting the electromagnetic latch relay. When abnormal continuous transmission is detected, the electromagnetic latch relay is excited by the electromagnetic latch relay excitation means, and no demagnetization means is built-in.

[Embodiments of the invention]

Hereinafter, one embodiment of the MCA wireless communication device according to the present invention will be described in detail with reference to the drawings.

In FIG. 2, 24 is an electromagnetic latch relay. The electromagnetic latch relay 24 has a break J long point consisting of a movable contact 24a and a fixed contact 24b, and is driven with low power and short pulses. Electromagnetic latch relays use a core material different from general core materials, and are configured to have a power-free self-holding function using the core's residual magnetism. It can also be restored by demagnetizing it with a short pulse in the opposite direction. Power supply-B is fixed contact 24b, possible #I contact 2
It is connected to the reference potential point via 4a.

The electromagnetic latch relay excitation circuit 23 connects the power supply 1B, anode, cathode, and terminal 2 when PUT Q 2 is turned on.
The electromagnetic latch relay 24 is energized by the circuit 3a.

For demagnetization, a negative pulse is applied to the test point 25. 22 is a time constant circuit, and a time constant resistor R1 and a capacitor C1 form a circuit according to the operation of the switching transistor Q3, and the capacitor C1 is charged. The potential of capacitor c1 increases and PUT determined by resistors R3 and R4
When the dart potential of Q 1 becomes lower than the cathode potential via resistor R2, PUT Q 1 is turned on and the f-) potential of PUT Q x of the electromagnetic latch relay excitation circuit 23 is lowered.

The switching transistor Q8 of the time constant circuit 22 is driven by the AND circuit 2° of the time constant i4 pulse generation circuit 18.
Works with 4'rus. The pulse circuit 19 has a PUT 25 as shown in FIG. 3, and the operation of the PUT 25 charges and discharges a capacitor 27 to output a clock signal from a terminal 19a. The OR circuit 17 is a signal that passes through the x-x' connection from the mechanical contact (not shown) of the PTT button 12, and the CP
A signal indicating the transmission status, a signal indicating that the final module 8 is transmitting, etc. are input from the U 15.

The discharging circuit 21 receives the receiving information from the OR circuit 17 or the fixed contact 24b of the &L magnetic latch relay 24, and discharges the charge in the capacitor C1.

If you press the PTT button 12 to make a call, the CPU 15
radiates the calling data to the MCA relay station via the output terminal 14b1 of the code input/output circuit 14, the drive module 9, the final module 8, and the antenna 1. An MCA relay station (not shown) receives call data and sends out a channel designation signal. The channel designation signal from the MCA relay station is sent via the antenna 1, RF unit, bandpass filter 3, mixer 4 (currently set to lower C channel), detector 5, and input terminal 141L of the code input/output circuit 14. C
It is input to PU 15. When the S channel number stored in the ROM 16 and the channel designation signal match, it becomes possible to receive on the lower 5s channel and transmit on the upper Bs channel.

Abnormal continuous transmission is detected by signals sent from the CPU 15, PTT button 12, final module 8, etc. to the OR circuit 17. The signal is sampled with the width of the clock pulse sent from the pulse circuit 19, and the switching transistor Q3 is sampled for a time corresponding to the sampled width.
turns on. Therefore, the charge on the capacitor CI rises stepwise in accordance with the pulse width, and the duration of transmission is counted in an analog manner. The counting error is determined by the leakage current of capacitor C1 and the pulse interval. When a predetermined time has elapsed, PUT Q l and Q! When ON, the magnetic latch relay 24 is energized. Therefore, the reference potential point connected to the power source -B is disconnected, and transmission is stopped.

When transmission stops, PUT Q t and Q2 are restored and the excitation current is also cut off. This state does not change even if you perform initial settings such as turning on the power again. When a negative pulse is applied from the test point 25 using a degaussing pulse generator (not shown) or the like, the electromagnetic latch relay is restored.

〔Effect of the invention〕

Since the MCA wireless communication device according to the present invention is configured to include a continuous transmission time detection means, an electromagnetic latch relay, and an electromagnetic relay excitation means, the failure state is stored in the electromagnetic latch relay, and the relay contact point is The feature is that the power can be cut off directly. Therefore, there is an effect that operational tests such as abnormality tests can be easily performed.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional MCA radio communication device, Fig. 2 is a partial circuit block diagram showing an embodiment of the MCA radio communication device according to the present invention, and Fig. 3 is a pulse diagram used in Fig. 2. It is a circuit diagram of a circuit. In the figure, 1 is an antenna, 2 is an RF unit, 3 is a bandpass filter, 4 is a mixer,
5 is a detector, 6゜10 is an audio circuit, 7 is a speaker, 8 is a final module, 9 is a drive module, 11 is a microphone, 12 is a PTT button, 13 is a PLL circuit,
14 is a code input/output circuit, 15 is a CPU, 16 is a ROM,
17 is an OR circuit, 18 is a time constant pulse generation circuit, 19
is a pulse circuit, 20 is an AND circuit, 21 is a discharge circuit, 2
2 is a time constant circuit, 23 is an electromagnetic latch relay excitation circuit, 2
4 is an electromagnetic latch relay, 25 is PUT. 26 is a resistor, 27 is a capacitor, Ql+Qz is PUT
1Q3 is a switching transistor, C1 to Ca1t capacitors, and R1 to R are resistors. Patent applicant Yaesu Musen Co., Ltd.

Claims (1)

[Claims] 1. An MCA wireless communication device equipped with continuous transmission time detection means, comprising an electromagnetic latch relay, an electromagnetic latch relay excitation means for exciting the electromagnetic latch relay, and a transmission function according to the operation of the electromagnetic relay. a circuit to stop;
An MCA wireless communication device, comprising: the continuous transmission time detection means activating the electromagnetic latch relay excitation means and stopping transmission.