JPH08154066A - Transmitter/receiver - Google Patents

Abstract

PURPOSE: To confirm signals over all the signal band ranges in a transmission mode by changing the signal band of a reception mode into a signal band including the signal band of the transmission mode while using a band control means. CONSTITUTION: When a transmission confirm switch 42 is pushed during a split mode operation before switching from the reception mode to the transmission mode, a transmission confirm mode is provided. Next, the states of oscillation circuits 81, 83 and 84, notch switch 48 and APF switch 49 are saved into the memory of a control part 3 corresponding to the control signal of the control part 3, namely, the setting of a jamming removing function is saved into the memory. Thus, respective frequencies F2, F4 and F5 outputted from the oscillation circuits 81, 83 and 84 are turned to '0' and PBT or notch filter and APF functions are canceled. Next, an oscillation circuit 7 outputs the same frequency F1 as a frequency F1' to a reception part 1 corresponding to the control signal from the control part 3, reception and transmission frequencies are matched, a switching circuit 6 is controlled, and the mode is switched to the reception mode to perform reception.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter / receiver having an interference canceling function for making a signal band in a receiving mode a signal band lacking a part of a signal band in a transmitting mode.

[0002]

2. Description of the Related Art Conventionally, a receiver may be interfered with by a radio wave (interference signal X) having a frequency adjacent to a target frequency. In order to remove such interference, various interference removal functions have been proposed which make the frequency characteristic of the signal path a selective characteristic by omitting a part of the signal band. Examples of such an interference removal function include a PBT (pass band tuning) function (however, "PBT" is a registered trademark of Icom Co., Ltd .; the same applies hereinafter), a notch filter function, and an APF (audio peak filter) function. The PBT function electrically shifts the center frequencies of at least one of the first filter and the second filter having band-pass characteristics arranged in the first intermediate frequency amplification section and the second intermediate frequency amplification section,
It is a method of changing a band to be substantially combined into a narrow band.
(See A in FIG. 2) Further, there is also a TWIN-PBT function which is further excellent in interference removal characteristics by shifting both. There is also a function that shifts both filters in opposite directions to enhance the removal function, and an IF shift function that shifts them in the same direction.

The notch filter function varies the center frequency of a notch filter (see B in FIG. 2) arranged in, for example, the third intermediate frequency amplification section to remove only a specific frequency (removal frequency) within the reception band. By doing so, the localized interference signal X is removed. The APF function emphasizes signals near the center frequency by varying the center frequency of a filter (see C in FIG. 2) that is placed in the low frequency part after detection and emphasizes only a specific frequency (emphasized frequency). However, the interference of other frequency components including the interference signal X is relatively reduced. This APF function is used in a CW mode or the like where the reception band is narrow.

A detailed description of each of the above functions will be given later. Note that each of these functions can be used together. Also, there is a transceiver having a split mode in which communication is performed by switching between a transmission mode and a reception mode with a predetermined frequency difference. In addition, when operating in split mode, the radio wave of the transmitter / receiver directly receives the radio wave of the partner station if it does not affect other radio stations or if communication is being performed using a repeater. Some have a transmission confirmation function to confirm whether or not it is possible. This transmission confirmation function is a function of confirming the situation near the transmission frequency by temporarily receiving the same frequency as the transmission frequency prior to transmission.

[0005]

In a transceiver in which such an interference canceling function is operated, if the interference canceling function is set to operate when receiving, even when the transmission confirmation function is operated. , The reception mode is activated when the interference removal function is activated. Therefore, the signal band in the reception mode is limited by the interference elimination function and a part of the signal band in the transmission mode is lacking, so that it is not possible to confirm the entire signal band in the transmission mode. That is, there was a problem that only insufficient confirmation was possible.

As described above, if only the insufficient confirmation can be made, if the interference signal X removed by the interference removal function is a communication signal between other wireless stations, if it is transmitted as it is, the other wireless stations will not be able to communicate with each other. Therefore, it is necessary to surely confirm the inside of the signal band before transmission because there is a problem that the communication is disturbed. Also, when using a repeater (repeater), without using the repeater,
There is a possibility that they can directly receive the transmissions from each other's wireless stations. For that purpose, it is necessary to receive the same frequency as the transmission frequency of the own station and confirm whether or not the transmission from the partner radio station can be received with sufficient strength. At this time, if the reception mode is switched while the interference canceling function is still active, the signal from the partner's radio station is removed as the interference signal, so that the transmission from the partner's radio station can be directly received. Nonetheless, he would have to communicate through the repeater without being able to confirm it.

Therefore, the present invention has been made for the purpose of providing a transceiver having a transmission confirmation function capable of receiving and confirming the signal band in the transmission mode without being lost when the transmission confirmation function is activated. Is.

[0008]

A transceiver according to the present invention is provided with a reception mode of a signal band in which a part of the signal band in the transmission mode is lacking, and temporarily when a transmission confirmation switch is operated. In a transceiver having a transmission confirmation function for switching to a reception mode of the same reception frequency as the transmission frequency, when the transmission confirmation switch is operated, the signal band of the reception mode includes the signal band of the transmission mode. A means for providing a bandwidth control means for changing to is taken. In addition, as described above,
The signal band lacking a part of the signal band in the transmission mode is not limited to one in which a part of the signal band is eliminated or attenuated by the interference elimination function, but one part is emphasized and the other part is relatively eliminated or attenuated. Including those made.

[0009]

According to the present invention, in a transceiver having a signal band reception mode in which a part of the signal band in the transmission mode is omitted, when the transmission confirmation switch is operated prior to transmission, the transmission confirmation function enables The reception mode of the same reception frequency as the transmission frequency is temporarily switched. At this time, the band control means changes the signal band in the reception mode to a signal band including the signal band in the transmission mode, so that signals in the entire range of the signal band in the transmission mode can be confirmed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A transceiver according to the present invention will be described below in detail with reference to the drawings showing the embodiments thereof.

In FIG. 1 showing the block configuration of an SSB transceiver as this embodiment, 1 is a receiving unit, 2 is a transmitting unit, 3 is a controlling unit, and 4 is an operating unit. The receiving unit 1 is
A first amplifier 51 for high frequency amplification, a first mixer 52 for converting to a first intermediate frequency signal, a first filter 53 for limiting a pass band of the first intermediate frequency signal, a second mixer 54 for converting to a second intermediate frequency signal, A second filter 55 that limits the pass band of the second intermediate frequency signal, a second filter that amplifies the second intermediate frequency signal
Amplifier 56, third mixer 5 for converting to a third intermediate frequency signal
7, notch filter 58, detection circuit 5 for low frequency signal
9, APF60, low-frequency amplifier for amplifying low-frequency signal, and speaker driven by the amplified low-frequency signal.

Reference numeral 6 denotes a transmission / reception switching circuit, which is a control unit 3
Either the receiving unit 1 or the transmitting unit 2 is operated by the control signal from. Needless to say, the antenna switching circuit 61 is also switched in association with the switching of transmission / reception. Reference numeral 7 denotes a frequency F1 serving as a reference of the reception frequency of the receiving unit 1 and a frequency F serving as a reference of the transmission frequency of the transmitting unit 2.
It is a first oscillating circuit that outputs 1'and outputs the frequency F1 and the frequency F1 'having a predetermined frequency difference when the split switch 41 is operated. 81 is PBT-1
The second oscillating circuit oscillates a frequency F2 that changes in association with the operation of the dial 43. A fourth mixer 82 outputs a frequency F3 obtained by adding the deviation frequency F1 and the frequency F2. Reference numeral 83 is a third oscillating circuit that oscillates a frequency F4 that changes in association with the operation of the PBT-2 dial 44.

Reference numeral 84 is a fourth oscillating circuit which oscillates a frequency F5 which changes in association with the operation of the notch dial 45 when the notch switch 48 is on. A fifth oscillator circuit 85 oscillates a frequency F6 for SSB detection. A fifth mixer 86 outputs a frequency F7 obtained by subtracting the frequency F4 from the frequency F2. A sixth mixer 87 outputs a frequency F8 obtained by subtracting the frequency F4 from the frequency F5. A seventh mixer 88 outputs a frequency F9 obtained by subtracting the frequency F6 from the frequency F5.

The first filter 53 has the characteristics shown in A of FIG. 2 and A of FIG.
Since the frequency F3 and the frequency F7 are shifted by turning 43, the first intermediate frequency output from the first mixer 52 and the second intermediate frequency output from the second mixer 54 are shifted, and equivalently, The center frequency of the 1 filter 53 shifts relatively to the signal band. That is, as shown in FIG. 3B, the first signal is generated so that the interference signal X1 existing on one side of the target signal is out of the pass band.
By shifting the center frequency of the filter 53,
It acts as a PBT function to remove interference.

The second filter 55 has the characteristics shown in A of FIG. 2 and A of FIG.
Since the frequency F7 and the frequency F8 are shifted by turning 44, the second intermediate frequency output from the second mixer 54 and the third intermediate frequency output from the third mixer 57 are shifted, and equivalently, The center frequency of the 2 filter 55 shifts relatively to the signal band. That is, as shown in FIG. 3C, the second signal is generated so that the interference signal X2 existing on one side of the target signal is out of the pass band.
By shifting the center frequency of the filter 55,
It acts as a PBT function to remove interference.

Further, the PBT-1 dial 43 and the PBT
-By turning both dials 44 in the opposite direction,
As shown in A of FIG. 4, a TWIN-PBT that removes both interference signals X1 and X2 existing on both sides of a target signal.
It works as a function to eliminate interference. Further, by turning both the PBT-1 dial 43 and the PBT-2 dial 44 in the same direction, as shown in FIG. 4B, it operates as an IF shift function for shifting the intermediate frequency band to remove interference. Of.

The notch filter 58 has characteristics as shown in B of FIG. 2 and C of FIG. 4 when the notch switch 48 is on, and when the notch dial 45 is turned, the output from the fourth oscillating circuit 84 is output. By changing the frequency F5 to be applied, the removal frequency of the notch filter equivalently moves relatively within the band of the third intermediate frequency. That is, as shown in FIG. 2B and FIG. 4C,
The interference is removed by matching the removal frequency of the notch filter with the localized interference signal X.

The APF 60 has characteristics as shown in C of FIG. 2 and D of FIG. 4 when the APF switch 49 is turned on, and by turning the APF dial 46, the emphasized frequency is changed. That is, as shown in C of FIG. 2 and D of FIG. 4, the interference signal X is relatively suppressed by emphasizing the CW signal S in the CW mode.

The two frequencies F1 and F1 'output from the first oscillation circuit 7 are controlled by a control signal from the controller 3. When the split switch 41 is off, the transmission frequency and the reception frequency are set to be the same and operated. These frequencies are set by the main dial 47. When the split switch 41 is turned on, the transmission frequency and the reception frequency are set to a predetermined frequency difference, and the split mode is set. In split mode,
In conjunction with the switching of transmission and reception, based on the control signal from the control unit 3, the frequency F1 different from that of the first oscillation circuit 7
And frequency F1 'are output. These frequencies are set by the main dial 47 and are stored in the controller 3
It is stored in the memory of the PU.

The transmission confirmation function is composed of the reception unit 1, the control unit 3, the transmission / reception switching circuit 6, and the antenna switching circuit 61, and the band control means is the control unit 3, the second oscillation circuit 81, and the third oscillation circuit. The circuit 83 and the fourth oscillation circuit 84 are included.

The first oscillating circuit 7 may include one PLL oscillating circuit to switch its oscillating frequency in association with transmission / reception, or two PLL oscillating circuits may be incorporated and each oscillating circuit for transmission. Alternatively, it may be shared as a receiving oscillation circuit. Further, regardless of the format such as simplex or duplex, it can be applied to various types of transceivers as long as the transmission frequency and the reception frequency are set separately.

The transmission confirmation function will be described below with reference to FIG. When the split switch 41 is turned on, the transmission frequency and the reception frequency are set to a predetermined frequency difference, and the transmission / reception switching circuit 6 is controlled to switch from the reception mode to the transmission mode during operation in the above-described split mode, the switching is performed. Prior to step 1, the transmission confirmation switch 42 is pressed to enter the transmission confirmation mode. In this transmission confirmation mode, first, the second oscillator circuit 81, the third oscillator circuit 83, and the fourth oscillator circuit are controlled by the control signal from the controller 3.
Control signal to 84, notch switch 48 and APF switch
The state of 49 is read and temporarily saved in the memory of the control unit 3. (Step 1) Then, by the control signal from the control unit 3, the second oscillation circuit
The frequency F2 output from 81, the frequency F4 output from the third oscillation circuit 83, and the frequency F5 output from the fourth oscillation circuit 84 are set to 0 to cancel the PBT function, and
The signals from the notch switch 48 and the APF switch 49 are cut off to release the notch filter function and the APF function.
(Step 2) Therefore, the entire range of the signal band in the transmission mode can be received.

Next, the first oscillating circuit 7 outputs the same frequency F1 as the frequency F1 'to the receiving section 1 on the basis of the control signal from the control section 3 to make the receiving frequency coincide with the transmitting frequency. (Step 3) Next, the transmission / reception switching circuit 6 is controlled to switch to the reception mode. (Step 4) At this time, receive at the same reception frequency as the transmission frequency,
In addition, the signal band is received in the same bandwidth as the signal band of the transmission frequency without missing. Therefore, it is possible to confirm if the radio wave of another radio station exists in the signal band occupied by the transmission. It should be noted that the radio waves of such other radio stations cannot be confirmed only by setting the same reception frequency as the transmission frequency in the reception mode in which the interference removal function is activated as in the conventional case.

When the transmission confirmation switch 42 is turned off, the first
The oscillation circuit 7 receives the frequency F1 having a predetermined frequency difference from the transmission frequency based on the control signal from the control unit 3
And sets the reception frequency in the receiving unit 1 to a predetermined reception frequency different from the transmission frequency. Next, the control unit 3
The control signals to the second oscillator circuit 81, the third oscillator circuit 83, and the fourth oscillator circuit 84 are restored to the original state based on the data saved in the memory of the notch switch 48 and the AP.
By returning the signal of the F switch 49 to the original state, each interference removal function is activated again, and the transmission / reception switching circuit 6 is controlled to switch to the reception mode. That is, at this time, the signal is received at a predetermined reception frequency different from the transmission frequency, and the signal band is a band limited by the interference removal function.

Next, the case of using a repeater will be described. When a repeater is used, normally, the transmission frequency from the wireless station to the repeater and the transmission frequency from the repeater to the wireless station are set to different frequencies. Therefore, when both the first wireless station A and the second wireless station B in the short distance are set to the same transmission frequency FT and the same reception frequency FR, they do not use the repeater to communicate with each other. It may be possible to directly receive the transmission from the wireless station. For that purpose, it is necessary to receive the same frequency as the transmission frequency of the own station and confirm whether or not the transmission from the partner radio station can be received with sufficient strength.

At this time, if switching to the reception mode with the interference removing function still operating as in the conventional case, the signal from the partner radio station may be removed as an interference signal, and confirmation may not be possible. Therefore, according to this embodiment, when the transmission confirmation switch is turned on to enter the transmission confirmation mode, the entire range of the signal band of the transmission frequency can be received, so that the signal from the partner radio station can be directly received. You can check whether or not. If you can directly receive the signal from the other party's radio station, by making the transmission frequency and the reception frequency the same, without using a repeater,
They can communicate directly with each other.

As described above, according to the transceiver of this embodiment, various interference removing functions can be operated in the normal reception mode to remove the interference signal, and in the transmission confirmation mode, The effect of automatically canceling the interference removal function and receiving the entire range of the transmission frequency and enabling reliable transmission confirmation is obtained. When the transmission confirmation mode is released, the original interference cancellation function automatically resumes and the interference signal can be removed.

The interference removal function is not limited to the above-mentioned functions, but can be realized by another circuit configuration as long as the signal band in the reception mode is a signal band lacking a part of the signal band in the transmission mode. It also includes. Further, as the band control means, any other circuit configuration can be used as long as it widens a signal band lacking a part of the signal band in the transmission mode and changes it to a signal band equal to or more than the signal band in the transmission mode. It is also possible to do so. For that purpose, it can be easily realized by a means for canceling the interference removal function in conjunction with the transmission confirmation switch.

[0029]

According to the present invention, when the transmission confirmation switch is operated, the transmission confirmation function temporarily switches to the reception mode of the same reception frequency as the transmission frequency, and the band control means causes the reception mode to be changed. By changing the signal band of to a signal band that includes the signal band in the transmission mode, you can check the status of radio waves from other wireless stations within the band by receiving without failing the entire range of the signal band in the transmission mode. Therefore, it is possible to prevent a transmission that interferes with communication with another wireless station.

[Brief description of drawings]

FIG. 1 is a block diagram of a transceiver according to an embodiment of the present invention.

FIG. 2 is a diagram showing characteristics of each filter of an interference removal function.

FIG. 3 is a diagram illustrating an interference removal function.

FIG. 4 is a diagram illustrating an interference removal function.

FIG. 5 is a flowchart of the operation of the transceiver.

[Explanation of symbols]

 1 receiver 2 transmitter 3 controller 4 operation 42 transmission confirmation switch (1,3,6,61 transmission confirmation function) (3,81,83,84 band control means) (steps 3,4 transmission confirmation function) ( Steps 1 and 2 bandwidth control means)

Claims (1)

[Claims] 1. A transmission having a reception mode of a signal band lacking a part of the signal band in the transmission mode, and temporarily switching to a reception mode of the same reception frequency as the transmission frequency when a transmission confirmation switch is operated. In a transceiver having a confirmation function, when a transmission confirmation switch is operated, a band control means for changing the signal band in the reception mode to a signal band including the signal band in the transmission mode is provided. A transceiver that does.