JP2736213B2 - Break-in control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a communication device having a Q communication mode and a telegraph mode, and more particularly, to a break-in control circuit used for protecting a receiver from inducing output of a transmitter.

[0002]

2. Description of the Related Art In a wireless system in which a transmitter and a receiver using the same frequency or the same band are arranged close to each other, when a transmission output of the transmitter is received by the receiver, a high-frequency input stage of the receiver is used. May be destroyed by the induction power of the transmitter. Break-in control is used in a system having such an arrangement and is a technique for preventing the circuit of a receiver from being destroyed.

[0003] Radio equipment for the medium wave band, short wave band, and the like includes, for example, telephone, telegraph (Morse communication), and FS (frequency shif).
t) Designed to transmit and receive various types of radio waves, such as signal communications. For example, telegraph mode and FS signal communication mode 2
In a communication device designed to perform communication in various types of communication modes, by performing mode switching by a communication mode selection signal as necessary, it is possible to perform communication by telegraph or communication by FS signal.

When using a communication device in the telegraph mode,
Since the occupied frequency bandwidth needs to be suppressed to 0.5 kHz or less according to laws and regulations, even after the electronic key signal (KEY signal) changes from a mark to a space, the transmission power is gradually reduced and held. For example, after the disappearance of the KEY signal, the radio wave is continuously transmitted from the transmitter for a time of about 15 to 20 msec, although the power gradually decreases.

Therefore, when the break-in control is performed in the communication device having the telegraph mode, the communication between the terminals 15 and 2 is required.
It is necessary to continue the break-in control for 0 msec. For example, when the transmitter is configured to cut off the connection between the receiver and the receiving antenna disposed close to the transmitter and the receiving antenna by a relay or the like while the transmitter is transmitting radio waves from the transmitting antenna, the KEY signal is It is necessary to maintain the state of the relay and keep the connection between the receiver and the receiving antenna in a disconnected state while radio waves are being transmitted from the transmitter even after the disappearance.

[0006] In addition, FS signal communication includes so-called ARQ.
(Automatic request for repetition). ARQ communication is transmitted for 210 msec.
By performing reception for 40 ms, 450 ms
This is a communication format in which transmission and reception are repeated with ec as one cycle.
More specifically, one character is composed of 7 bits = 70 msec using a signal of 1 bit = 10 msec, and 3 characters = 2
This is a communication format in which a response of one character is received from the partner station after transmitting 10 msec. Therefore, in a communication device having the ARQ communication mode, transmission and reception are repeatedly and frequently executed.

[0007]

As described above, in the ARQ communication, if the receiver is in a reception-disabled state for about 10 msec, information for one character in information to be received from another station is lost. . Therefore, in a communication device having both the telegraph mode and the ARQ communication mode, if the break-in control in the telegraph mode described above is applied,
When the relay state is maintained for about 20 msec, one or more characters are lost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has been made in view of a telegraph mode and an AR mode.
It is an object of the present invention to protect a receiver by suitably performing break-in control using a relay or the like in a communication device having a Q communication mode, and to prevent a loss of received information in the receiver.

[0009]

In order to achieve the above object, according to the present invention, transmission of a predetermined time is repeatedly executed at a predetermined period in ARQ communication, and transmission of a KEY signal is performed in a telegraph. And a receiver disposed in the vicinity of the transmitter, comprising a break-in control circuit having the following configuration.

[0010] That is, the break-in control circuit of the present invention, telegraph when a break-in control for generating a telegraph at receiver protection signals disappear after a generated in response to the occurrence of the KEY signal time from loss of KEY signal T _D1 means and, detection means for detecting the FS modulation signal input, generating means for generating the generated detection output receiver protection signal when ARQ communications lost time T _D2 elapses after the loss of in accordance with the detection output of the detection means, and a break-in control means when ARQ communication with delay means for supplying to the transmitter T _a delays the FS modulated signal the input time, depending on the telegraph at the receiver protection signals during wire, when receiving ARQ communication during ARQ communication And a break-in means for setting the receiver in a non-receivable state in response to the protection signal. The delay time _{T D} that is, when the delay time _{T DD} of the detection means, the operation time of the break-in means was _{T K,} each _{time, T D1 + T K> T} D ... (1) T DD + T K <T _A ≦ T _DD + T _D2 + T _K (2)

[0011]

According to the present invention, A is also used during telegraph as follows.
Even during RQ communication, break-in control is performed without losing received information.

First, at the time of telegraph, a KEY signal is supplied to a transmitter and transmitted. For the purpose of suppressing the occupied bandwidth described above, the transmitter transmits a delay time T _D when the KEY signal is lost.
Set. That is, even after the KEY signal is lost, during this time T _D, the transmitter continues to transmit power. On the other hand, the telegraph-time break-in control means generates a telegram-time receiver protection signal, and the break-in means sets the receiver in a reception disabled state in accordance with this signal.

The generation timing of the receiver protection signal at the time of telegraph is the generation timing of the KEY signal. Therefore, if the operating time of the break-in means and T _K, the timing of the receiver is unreceivable state, after the occurrence of KEY signal time T
_{This is} the time point when _K has elapsed. In addition, the disappearance timing of the receiver protection signal at the time of telegraph is a timing at which the time _TD1 has elapsed from the disappearance of the KEY signal. Therefore, the timing at which the receiver enters the receivable state is the time T _D1 after the disappearance of the KEY signal.
It is the time when + _TK has elapsed. In the present invention, since the time relationship is set as in the above equation (1), the receiver is protected from the induction of the transmission output of the transmitter while suppressing the occupied bandwidth as in the related art.

[0014] Then, at the time of ARQ communications, FS modulation signal delay is performed time T _A by the delay means is transmitted is supplied to the transmitter. On the other hand, FS modulation signal input (previous delay T _A) is detected by detecting means, when ARQ communication receiver protection signal by generating means in accordance with the detection output of the detection means is generated. The break-in means sets the receiver in a reception disabled state in response to the signal.

The generation timing of the receiver protection signal during ARQ communication is the detection output timing of the detection means. Therefore, if the delay time of the detection means and T _DD, the timing of the receiver is unreceivable state is the time when time T _{DD +} T _K from the occurrence of FS modulated signal has elapsed. In the present invention, as shown in equation (2), T _A > T _DD + T _K
Therefore, the timing at which the receiver enters the non-reception state is earlier than the timing at which the FS modulation signal is generated, which is the timing at which the transmitter starts transmission. In addition, the disappearance timing of the receiver protection signal during ARQ communication is as follows:
This is the time when the time _TD2 has elapsed since the disappearance of the detection output.
Therefore, the timing at which the receiver enters the receivable state is F
This is the time when the time T _DD + TD ₂ + _TK has elapsed since the disappearance of the S-modulated signal. In the present invention, since T _A ≦ T _DD + T _D2 + T _K is set as shown in Expression (2), the timing at which the receiver enters the receivable state depends on the setting of the delay times T _A and T _D2 . Only with this, it can be set immediately after the transmitter has finished transmitting. Therefore, in a state where transmission is being performed from the transmitter, the receiver disposed in the vicinity of the transmitter is in an unusable state, and is protected from destruction due to guidance or the like. At the same time, it is possible to set the receiver in a receivable state immediately after the transmitter has finished transmitting, so that the FS modulation signal transmitted from another communication device is not lost.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration of a communication device according to an embodiment of the present invention. This communication device uses an electronic key signal (KE
Telecommunication by Y signal) and ARQ by FS modulation signal
It is a communication device that can execute communication together, and has a transmitter 10 and a receiver 12. The transmitter 10 includes a transmitting antenna 1
From 4, the radio wave in the medium and short wave band is transmitted to (the receiver of) another station. When connected to the receiving antenna 16, the receiver 12 receives a radio wave transmitted from (the transmitter of) another station.

This communication device has a break-in control circuit 18
have. The break-in control circuit 18 controls the transmitter 1
By disconnecting the receiving antenna 16 and the receiver 12 when 0 is transmitting, the receiver 12 is protected from being guided by the transmission output of the transmitter 10 and is prevented from being destroyed.

The break-in control circuit 18 is a means for opening and closing the connection between the receiving antenna 16 and the receiver 12.
K has a relay _{K 1.} Note that the present invention does not need to limit the relay. Transistor TR ₁ is, B
K is a transistor for driving the excitation coil 20 of the relay K _1, and turned on when a voltage higher than a predetermined value is applied to the base, the collector is grounded. In this state, a current from the power supply + V flows through the exciting coil 20 and BK
Contact 21 of the relay K ₁ is connected to the ground side. Conversely, when the transistor TR ₁ is turned off, the contact 21 of the BK relay K ₁ is connected to the receiving antenna 16 side. Therefore,
Receiver in a state in which the transistor TR ₁ is turned 12
Is in a reception disabled state, and is in a reception enabled state in an off state. The resistor _{R 3} is base input resistance of the transistor TR _{1, R 4} is a ground resistance.

The break-in control circuit 18, a circuit that communication mode is used when a wire mode, in addition to the BK relay K ₁ and transistor TR ₁ described above have the switch 22 and the delay time generating circuit 24 doing. Switch 2
2 supplies the KEY signal to the delay time generation circuit 24 when the communication mode selection signal has a value indicating the “telegraph mode”. The output of the delay time generation circuit 24 rises when the KEY signal changes from a space to a mark, and falls when a predetermined time has elapsed from the time when the KEY signal changes to a space.

[0021] Therefore, when a KEY signal changes to the mark from the space, as shown in FIG. 2, the collector output rising thus the transistor TR ₁ of substantially simultaneously delay time generating circuit 14 and the change is grounded . BK
When the operating time of the relay K ₁ and T _K, time from KEY signal is changed to the mark from the space to BK relay K ₁ is connected to the side receiving antenna 16 is represented substantially T _K.

Further, when a KEY signal changes the space from the mark, as shown in FIG. 2, the output of the time from the time of the change T _{D1 +} T _K delay time after generation circuit 14 is therefore falling the collector potential of the transistor TR ₁ becomes the potential of the power supply + V. This time T _D1 is
The value is proportional to the product C ₁ R ₁ of the value of the capacitor C ₁ and the value of the resistor R ₁ , and is a delay time given by the delay time generation circuit 24.

As described above, in this embodiment, the KEY
Signal becomes unreceivable state receiver 12 at the elapse of time T _K after changing the mark from the space, the reception state receiver 12 at the elapse of time T _{D1 +} T _K after changing the space from the mark Becomes

In the case of the telegraph, transmitter 10, KEY signal persists gradually reduced while the predetermined time T _D of the transmission output upon changing the space from the mark. In the present embodiment, the time T _D1 is set so as to satisfy the above-described equation (1). Therefore, at the time of telegraph, the receiver 12
Can be protected from being guided by the transmission output of the transmitter 10, and the occupied bandwidth restriction required by law can be realized. For example, when T _D = 20 msec, T _{D1 is set} to 30 msec. Operating time T of BK relay K1
_K is, for example, 2 msec. By setting such _TD1 , Expression (1) can be satisfied.

The break-in control circuit 18 is a circuit used when the communication mode is the ARQ communication mode. In addition to the BK relay K ₁ , the transistor TR ₁ and the switch 22, the analog delay circuit 26 and the AF detection Circuit 2
8 and a delay time generation circuit 30.

The analog delay circuit 26 receives the input FS
On the modulation signal (e.g. AFSK modulation signal) by a predetermined time _{T A} delay, it is input to the transmitter 10. AF detection circuit 2
8 detects the AFSK modulated signal before being subjected to the delay by the analog delay circuit 26, and supplies the detected signal to the switch 22.
The switch 22 outputs the output of the detection circuit 28 to the delay time generation circuit 30 when the communication mode selection signal has a value indicating “ARQ communication mode”. Output of the delay time generating circuit 30, like the output of the delay time generating circuit 24, is applied to the base of the transistor TR _1.

As described above, ARQ communication is a communication format in which transmission and reception are repeated at a predetermined cycle. When the transmission cycle there is an input incoming FS modulated signal, since the modulated signal is subjected to delay time T _A by the analog delay circuit 26, as shown in FIG. 3, the transmission output start timing of the transmitter 10 is modulated Time T from signal input start timing
The timing is _A later. Output of the delay time generating circuit 30, because the rise in the output timing of the detection circuit 28 at the start of the ARQ transmission, the collector of the transistor TR ₁ is substantially grounded simultaneously with the output of the detection circuit 28.
In view of the BK operating time T _K of the relay K _1, the timing of connection is actually broken in the receiving antenna 16 and the receiver 12, as shown in FIG. 3, the time T from the input of the FS modulated signal _{D D +} T _This is the time when _K has elapsed. Where T
_DD is a delay time generated by the AF detection circuit 28.

In this embodiment, this time T _DD + T
The relationship between _K and the delay time T _A of the analog delay circuit 26 is set as T _DD + T _K <T _A. That is, the timing at which the receiver 12 enters the reception disabled state is set so as to be always before the timing at which the transmitter 10 starts transmission. With such a setting, the receiver 12 at the start of transmission by the transmitter 10
Induced destruction of the steel is prevented. Delay time T of detection circuit 28
_DD is 0.5msec, BK operating time of the relay _{K 1 T K}
Is 2 msec, this relationship is, for example, T _A
= 3 msec.

Further, the transmission at the end of the FS modulated signal, the output of the delay time generating circuit 30, a timing delayed by more time T _D2. That is, the detection output delayed by the time T _{DD with} respect to the FS modulation signal is further delayed by the time T _D2 in the delay time generation circuit 30. _{However, T D2} is the resistance _{R 2} and a time proportional to the product _C 2 _{R 2} value of the capacitor _{C 2.} As a result, as shown in FIG. 3, the timing at which the collector potential becomes the potential of the power supply + V of the falling transistor TR ₁ output edge of the delay time generating circuit 30, the input end timing of the FS modulation signal, time T _DD The timing is delayed by + _TD2 . Therefore, considering the operating time T _K of BK relay K _1, the timing of the receiver 12 is receivable state,
T _DD + T with _respect to the input end timing of the FS modulation signal
The _D2 + _{T K} delayed timing.

In this embodiment, this time T _DD + T
Delay relationship between the time _{T A} of the _D2 + _{T K} and the analog delay circuit 26, since it is set to _{T A ≦ T DD + T D2} + T K, the timing of the receiver 12 is receivable state, always, the transmitter 10 After the transmission end timing. Such a setting prevents induced destruction of the receiver 12 at the end of the transmission of the transmitter 10.

Further, this relationship is based on the analog delay circuit 26
The delay time T _A of the analog delay circuit 26 and the delay time T _D2 of the delay time generation circuit 30 can be appropriately set, so that transmission from other stations is possible. The received information can be received by the receiver 12 without losing the information.

Here, the delay time T _DD of the detection circuit 28 is 0.5 msec, and the operation time T _K of the BK relay K ₁ is 2 m.
sec, this relationship is, for example, T _A = 3 m
sec, T _D2 = 2.5 msec. In this configuration, T _A and T
Difference _{DD + T} D2 _{+ T K} is 2msec, but actually since the time delay between the input and output of the transmitter 10 is generated, exactly, the same result as time T _A is set longer, both The difference narrows. According to the results of experiments performed by the inventor using a 125 W HF transmitter, the delay time between the input and output of the transmitter 10 is about 1 msec. Assuming that the transmitter of the partner station has the same delay time, the timing at which radio waves are transmitted from the partner station almost coincides with the timing at which the receiver 12 enters a receivable state. Therefore, no information is lost.

Although the above example is an example of an AFSK modulated signal, another FS signal may be used.

[0034]

As described above, according to the present invention,
Since the FS modulated signal is supplied to the transmitter after being delayed, the FS modulated signal is detected and the detection output is appropriately delayed to perform break-in control. In control can be implemented. As a result, suitable ARQ communication can be performed at the same frequency. Further, at the time of telegraph, break-in control can be performed in accordance with a request for limiting the occupied bandwidth. Furthermore, at the time of remote control, even if a difference occurs in the propagation delay time between the KEY signal and the FS modulation signal due to the multiplex line, the break-in control can be performed with accurate timing.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is a timing chart in a telegraph mode (A1A) in this embodiment.

FIG. 3 is a timing chart in the ARQ mode in the embodiment.

[Explanation of symbols]

Reference Signs List 10 transmitter 12 receiver 14 transmission antenna 16 reception antenna 18 break-in control circuit 22 switch 24, 30 delay time generation circuit 26 analog delay circuit 28 AF detection circuit K ₁ BK relay TR ₁ BK relay driving transistor C ₁ , R C for delay time determination of _one delay time generation circuit 24
RC ₂ , R ₂ C for delay time determination of delay time generation circuit 30
R T _A delay time due to analog delay circuit T _D delay time due to transmitter T delay time due to _DD detection circuit T _D1 delay time due to delay time generation circuit 24 T _D2 delay time due to delay time generation circuit 30

Claims (2)

(57) [Claims] 1. A and telegraph during break-in control means for generating a telegraph at receiver protection signals disappear after a generated in response to the occurrence of the telegraph key signal time from loss of telegraph key signal T _D1, FS modulation signal input delay detection means time T _DD for detecting a generating means for generating a receiver protection signal when ARQ communication occurs according to the detection output disappears after a time T _D2 elapses from the disappearance of the detection output of the detection means, and the inputted F
A break-in control means when ARQ communication with delay means for supplying to the transmitter S modulated signal is time T _A delay, depending on the telegraph at the receiver protection signals during wire, depending on the receiver protection signal when ARQ communication during ARQ communication , and a break-in means for the receiver unreceivable state, the delay time T _D which is applied by the transmitter when the disappearance of the telegraph key signal when the _telegraph, the delay time of the detection means T _DD,
The operating time of the break-in means when the _{T K,} break each time, and having a respective relationship between _{T D1 + T K> T D} T DD + T K <T A ≦ T DD + T D2 + T K In control circuit. 2. A transmitter that repeatedly executes transmission for a predetermined time at a predetermined period during ARQ communication, and executes transmission of an electronic key signal during telegraph, and a receiver that is arranged close to the transmitter. A communication device comprising: the break-in control circuit according to claim 1.