JP5104666B2 - Receiver and receiver gain adjustment method - Google Patents

Description

  The present invention relates to a receiver that can efficiently work to adjust a gain to a specified value, and a receiver gain adjustment method.

When manufacturing multiple receivers of the same specification, even if the same manufacturing process is performed using parts of the same specification in the same manufacturing process, there are variations in the used parts, for example, individual differences occur in amplifiers. Therefore, the gain of the receiver also varies.
In such a case, it was necessary to adjust the gain of each receiver to a specified value before shipment.

A specific adjustment operation when manufacturing and shipping such a receiver will be described.
As shown in FIG. 9, the receiver 100 that requires adjustment includes a mixer 110, a local oscillator 120, a bandpass filter 130, a variable gain amplifier circuit 140, and a detector 150.
The receiver 100 is connected with a waveform generator 200 that generates an adjustment signal and a voltmeter 300 that measures the signal intensity of the detection output of the receiver 100.

First, the output signal from the waveform generator 200 is turned off so that the adjustment signal is not input to the receiver 100, and the signal intensity of the detection output in this state is read by the voltmeter 300. . In an example of the signal output from the detector 150 in this state, as shown in FIG. 10A, the signal from the waveform generator 200 is turned off, so the carrier component of the adjustment signal A noise component is output without being output.
Next, the output signal from the waveform generator 200 is turned on so that an adjustment signal is input to the receiver 100, and the signal intensity of the detection output in this state is read by the voltmeter 300. . In an example of the signal output from the detector 150 in this state, the carrier component of the adjustment signal is output as shown in FIG.
The receiver 100 is set such that the difference between the signal intensity when no adjustment signal is input and the magnitude of the signal intensity of the carrier component when the adjustment signal is input is a specified value. The gain in the variable gain amplifying circuit 110 built in is adjusted.

In the conventional method described above, it is necessary to manually turn on / off the waveform generator, which is cumbersome, and thus automation has been desired.
As an improvement of the conventional method, a method of controlling on / off of the waveform generator using a PC or the like has been proposed.
However, in order to realize this method, a means for controlling on / off of the waveform generator needs to be disclosed.

  A power amplifying circuit that eliminates the trouble of adjusting the bias voltage in the power amplifying circuit is disclosed in Patent Document 1.

JP 2002-353749 A

An object of the present invention is to provide a technique capable of easily adjusting a gain of a receiver to a specified value.

A receiver according to claim 1 of the present invention includes:
A receiver including a variable gain amplifier circuit that amplifies an input signal,
A first amplification mode in which the adjustment signal input to the receiver is amplified in a state where the adjustment signal is excluded using a filter built in the receiver, or a state including the adjustment signal input to the receiver Control means for switching to one of the two amplification modes of the second amplification mode to be amplified at
Measuring means for measuring the signal strength in each of the two amplification modes ,
The filter is configured using a filter in which the frequency of the adjustment signal is outside its passband,
The control means may change the variable so that a difference between the signal intensity in the second amplification mode measured by the measurement means and the signal intensity in the first amplification mode measured by the measurement means becomes a specified value. The gain of the gain amplifying circuit is adjusted.

The receiver of claim 2 comprises:
A first signal path comprising a band rejection filter for eliminating the adjustment signal as the filter;
A second signal path through which the adjustment signal is passed without being excluded;
Wherein the path of the adjustment signal, and a switch for switching to one of said first signal path or the second signal path,
The control means includes
In the first amplification mode is switched to the first signal path by controlling the switch, and outputs a signal for the adjustment input to the receiver to eliminate by the band rejection filter,
In the second amplification mode, is switched to the second signal path by controlling the switch, is passed through a not exclude input signal for said adjustment is configured to output to the receiver Tei Ru.

The receiver of claim 3 is:
A first signal path that excludes the adjustment signal by either one of the upper sideband filter or the lower sideband filter for SSB communication as the filter ;
A second signal path that passes through the other sideband filter without excluding the adjustment signal;
Wherein the path of the adjustment signal, and a switch for switching to one of said first signal path or the second signal path,
The control means includes
In the first amplification mode is switched to the first signal path by controlling said switch, a signal for adjustment input to the receiver to eliminate by the one of the sideband filter output And
In the second amplification mode is switched by controlling the switch to the second signal path, and is configured to output without eliminating signal for adjustment input to the receiver.
The receiver of claim 4 is:
The receiver further includes:
A local oscillator,
A mixer that mixes a local oscillation signal output from the local oscillator and an input reception signal and converts the frequency into an intermediate frequency of a predetermined frequency band;
A band-pass filter that receives only an intermediate frequency component of a predetermined band by inputting an output from the mixer as the filter;
The variable gain amplifier circuit is configured to amplify the output from the band-pass filter,
The local oscillator includes a first frequency band to be frequency-converted into an intermediate frequency components outside the predetermined frequency band in the mixer, an intermediate frequency component of the predetermined frequency band in the mixer can pass through the band-pass filter It is configured to switch and output a local oscillation signal in any one of the second frequency bands to be frequency-converted,
The control means includes
In the first amplification mode, the output of the local oscillator is switched to the first frequency band. In the second amplification mode, the output of the local oscillator is switched to the second frequency band.
The gain of the variable gain amplifier circuit is such that the difference between the signal intensity in the second amplification mode measured by the measuring means and the signal intensity in the first amplification mode measured by the measuring means becomes a specified value. Configured to adjust.

A receiver gain adjustment method according to claim 5 of the present invention is:
A variable gain amplifier circuit for amplifying an input signal;
In a first amplification mode in which the adjustment signal input to the receiver is amplified in a state where the adjustment signal is excluded using a filter built in the receiver, or in a state including the adjustment signal input to the receiver Control means for switching to one of the two amplification modes of the second amplification mode to be amplified;
Measuring means for measuring the signal strength in each of the two amplification modes ,
The filter is a gain adjustment method for a receiver configured using a filter in which the frequency of the adjustment signal is outside its passband ,
Procedure 1 for controlling the control means to switch to the first amplification mode;
In the first amplification mode, a procedure 2 for measuring the signal intensity when the signal is amplified in a state where the adjustment signal input to the receiver is excluded using the measuring unit;
Procedure 3 for controlling the control means to switch to the second amplification mode;
In the second amplification mode, a procedure 4 for measuring the signal intensity when the signal is amplified in a state including the adjustment signal input to the receiver using the measurement unit;
And a step 5 of adjusting the gain of the variable gain amplifier circuit so that a difference between the signal intensity measured in the procedure 2 and the signal intensity measured in the procedure 4 becomes a specified value.

In the receiver according to claim 1 of the present invention,
The gain in the first amplification mode that amplifies in a state where the adjustment signal input to the receiver is excluded, and the second amplification mode that amplifies in the state that the adjustment signal input to the receiver is included Since the gain of the variable gain amplifier circuit is adjusted by the control unit so that the difference in signal strength becomes a specified value, it is only necessary to operate the adjustment program without controlling the on / off of the waveform generator. The gain can be set to a specified value.
Therefore, a large number of receivers can be easily adjusted to the same gain efficiently.
In claim 2,
By switching between a first signal path having a band rejection filter that eliminates an adjustment signal input to the receiver and a second signal path that does not include the band rejection filter,
In the first amplification mode switched to the first signal path, the signal intensity when the adjustment signal is eliminated by the band rejection filter and in the second amplification mode switched to the second signal path The signal intensity in the state including the above signals is measured, and the control unit adjusts the gain of the variable gain amplifier circuit so that the difference between the two becomes a specified value. Without control, the receiver gain can be set to a specified value.
In claim 3,
Do not exclude the signal strength in the first amplification mode in which the adjustment signal is excluded by the sideband filter of either the upper sideband filter or the lower sideband filter for SSB communication, and the adjustment signal. Measuring the signal strength in the second amplification mode to pass through,
Since the control unit adjusts the gain of the variable gain amplifier circuit so that the difference between the two becomes a specified value, the gain of the receiver can be set to the specified value without controlling on / off of the waveform generator. it can.
In claim 4,
The local oscillator has a first frequency band that is frequency converted to an intermediate frequency component outside the predetermined frequency band, and a second frequency frequency that is converted to an intermediate frequency component of a predetermined frequency band that can pass through the bandpass filter. It is configured to switch and output the local oscillation signal of one of the frequency bands,
Measuring the signal strength in a first amplification mode in which the output of the local oscillator is a first frequency band and the signal strength in a second amplification mode in which the output of the local oscillator is a second frequency band;
Since the control unit adjusts the gain of the variable gain amplifier circuit so that the difference between the two becomes a specified value, the gain of the receiver can be set to the specified value without controlling on / off of the waveform generator. it can.
In the receiver gain adjustment method according to claim 5 of the present invention,
In the first amplification mode, the signal intensity when amplified without the adjustment signal input to the receiver, and the adjustment signal input to the receiver in the second amplification mode. Since the gain of the variable gain amplifier circuit is adjusted so that the difference from the signal strength when amplified in a state of inclusion is a specified value, the gain of the receiver is specified without controlling the on / off of the waveform generator. Can be set to a value.
Therefore, a large number of receivers can be easily adjusted to the same gain efficiently.

  Hereinafter, a receiver according to the present invention and a gain adjustment method of the receiver will be described in detail based on a block diagram of the receiver according to the first embodiment.

In FIG.
Reference numeral 10 denotes a receiver according to the first embodiment. The receiver 10 includes a mixer 11, a local oscillator 12, a bandpass filter 13, a variable gain amplifier 14 as a variable gain amplifier circuit, a detector 15, a control unit 16, and a memory. 17, a notch filter 18 as a band rejection filter, a first signal path L 1 that leads the output of the mixer 11 to the band-pass filter 13 through the notch filter 18, and the output of the mixer 11 without passing through the notch filter 18. A second signal path L2 leading to the bandpass filter 13 and a switch 19 for switching between the first signal path L1 and the second signal path L2 are provided.
The switch 19 is switch-controlled by the control unit 16, and the notch filter 18 blocks a single wave component for adjustment as an adjustment signal output from a waveform generator G described later. It is configured to exclude the adjustment signal.
The control unit 16 controls the switch 19 to measure the signal intensity of the signal passing through the second signal path L2, and controls the switch 19 to control the signal intensity of the signal passing through the first signal path L1. The variable gain amplifier 14 is controlled so that the difference between the two becomes a specified value and the signal intensity of the adjustment signal composed of the single wave component of the amplified adjustment signal becomes the specified value. It is configured as follows.
The specified value is stored in the storage unit 17.

Next, the procedure for adjusting the gain using the receiver 10 according to the first embodiment will be described with reference to the flowchart of FIG.
First, the waveform generator G is connected to the receiver 10 to operate the waveform generator G. In step 1, the adjustment program stored in the storage unit 17 of the receiver 1 is operated to start adjustment.
From the waveform generator G, a signal including a single wave component having a predetermined frequency for adjustment is output and input to the receiver 10.

In step 2, the control unit 16 controls the switch 19 to switch the output from the mixer 11 to the first signal path L1, and the signal from the waveform generator G is converted into a single wave component by the notch filter 18. The signal for adjustment is removed and only the noise component flows to the detector 15 through the band-pass filter 13 and the variable gain amplifier 14. In the example of the signal output from the detector 15 at this time, as shown in FIG. 3A, the single wave component is removed, the adjustment signal is eliminated, and only the noise component is output.
Then, in step 3, the signal strength measurement unit M measures the signal intensity in a state where the single wave component is removed from the adjustment signal and the adjustment signal is excluded in step 3. Then, the intensity of the noise component of the adjustment signal output from the waveform generator G is measured and temporarily stored in the storage unit 17 as a signal intensity value at the time of removal.

Next, when the control unit 16 controls the switch 19 in step 4 to switch the output from the mixer 11 to the second signal path L2, the signal from the waveform generator G includes a single wave component. A signal for adjusting the state flows through the bandpass filter 13 and the variable gain amplifier 14 to the detector 15. In an example of the signal output from the detector 15 at this time, an adjustment signal including a single wave component is output as shown in FIG.
Then, in step 5, the control unit 16 measures the signal intensity of the adjustment signal including the adjustment single wave component in the signal intensity measurement unit M, and in step 6, from the measured value. The signal strength value at the time of removal stored in the storage unit 17 is subtracted to measure the signal strength of the adjustment signal including a single wave component, and this measured value is stored in the storage unit 17 The gain is adjusted by adjusting the variable gain amplifier 14 so as to match the above.

According to the receiver 10 according to the first embodiment, the gain of the receiver 10 can be increased only by connecting to the receiver 10 in a state where the waveform generator G is operated and operating the adjustment program written in the storage unit 17. Since it can be easily adjusted automatically to the specified value, there is no need to control the waveform generator G.

  In the receiver 20 according to the second embodiment illustrated in FIG. 4, an LSB (Lower side band) bandpass filter 28 a is provided in the first signal path L 21 instead of the notch filter 18 in FIG. The signal path L22 is provided with a USB (Upper side band) bandpass filter 28b, and the output mixed with the local oscillation signal from the local oscillator 22 by the mixer 21 is supplied to the LSB bandpass filter 28a. The first signal path L1 guided to the variable gain amplifier 24 via the output and the output mixed with the local oscillation signal from the local oscillator 22 by the mixer 21 to the variable gain amplifier 24 via the USB band pass filter 28b. A switch 29 for switching between the second signal path L2 to be led is provided.

When the signal output from the waveform generator G includes a lower sideband component as an adjustment signal, the LSB bandpass filter 28a passes only the lower sideband component. The upper sideband component is blocked and eliminated. Therefore, when the adjustment signal output from the waveform generator G is only the upper sideband component, the upper sideband component is eliminated by the LSB bandpass filter 28a, the adjustment signal is eliminated, and the noise component Are output to the detector 25 via the variable gain amplifier 24.
On the other hand, when the adjustment signal output from the waveform generator G includes an upper sideband component, the USB bandpass filter 28b passes only the upper sideband component, and the lower sideband component. Is to block and eliminate. Therefore, when the adjustment signal output from the waveform generator G is only the lower sideband component, the lower sideband component is eliminated by the USB bandpass filter 28b, and the adjustment signal is eliminated. Only the noise component is output and output to the detector 25 via the variable gain amplifier 24.

FIG. 6 shows the configuration of the carrier component (actually removed and transmitted), the upper sideband component, and the lower sideband component in the SSB signal.
The LSB bandpass filter 28a configured for such an SSB signal passes only the lower sideband component, and the USB bandpass filter 28b passes only the upper sideband component. Therefore, if an adjustment signal including a signal corresponding to the upper side band component is output from the waveform generator G, the upper side band component passes through the USB band pass filter 28b, so that the adjustment signal passes. Since it is removed by the LSB band-pass filter 28a, the adjustment signal is eliminated.

A procedure for adjusting the gain using the receiver according to the second embodiment will be described.
First, the waveform generator G is connected to the receiver 20, the waveform generator G is operated, and the adjustment program stored in the storage unit 27 of the receiver 20 is operated. The waveform generator G generates an adjustment signal including only the upper sideband component.
When the control unit 26 controls the switch 29 to switch the output from the mixer 21 to the first signal path L21, the upper sideband component included in the adjustment signal from the waveform generator G is the LSB filter 28a. And the adjustment signal is eliminated, and only the noise component flows through the variable gain amplifier 24 to the detector 25. An example of the signal output from the detector 25 at this time is shown in FIG.
Then, the control unit 26 measures the signal intensity with the signal intensity measuring unit M in a state where the upper sideband component is removed, that is, in a state where the adjustment signal is excluded, so that the waveform generator G The intensity of the noise component of the output signal is measured and temporarily stored in the storage unit 27 as a signal intensity value at the time of removal.

Next, when the control unit 26 controls the switch 29 to switch the output from the mixer 21 to the second signal path L22, the upper sideband component included in the signal from the waveform generator G is the USB bandpass. Since the signal passes through the filter 28b, the signal from the waveform generator G flows through the variable gain amplifier 24 to the detector 25 in a state including the upper sideband component. An example of the signal output from the detector 25 at this time is shown in FIG.
Then, the control unit 26 measures the signal strength including the upper sideband component, that is, the signal strength of the adjustment signal, by the signal strength measuring unit M, and stores the measured signal strength in the storage unit 27. The signal strength value of the upper sideband component included in the adjustment signal, that is, the adjustment signal is measured by subtracting the signal strength value at the time of removal, and the measurement value is stored in the storage unit 27. The variable gain amplifier 24 is adjusted to set the gain so as to match the specified value.
In the second embodiment, the adjustment signal including the upper sideband component is used. However, the adjustment signal including the lower sideband component is used to adjust the lower side of the second signal path L22. The waveband component may be removed.

According to the receiver 20 according to the second embodiment, the gain of the receiver 20 can be increased by simply connecting the receiver 20 with the waveform generator G activated and operating the adjustment program written in the storage unit 27. It can be easily adjusted automatically to the specified value.
Further, since the LSB band-pass filter 28a and the USB band-pass filter 28b provided in the SSB receiver are also used for gain adjustment, the addition of an extra configuration can be minimized.
The switches 19 and 29 used in the first and second embodiments may be software switches configured to be switched by software.
Further, by adopting a filter capable of realizing a filter function equivalent to that of the LSB band-pass filter 28a and the USB band-pass filter 28b by switching the filter coefficient, and switching the filter coefficient in this filter, the first embodiment 2 may realize a function corresponding to the switching of the filter by the switches 19 and 29 in FIG.

The receiver 30 according to the third embodiment illustrated in FIG. 7 is replaced with the notch filter 18 of the receiver 10 of the first embodiment and the LSB bandpass filter 28a and the USB bandpass filter 28b of the receiver 20 of the second embodiment. The local oscillator 32 is characterized in that it can switch the local oscillation frequency band between two bands.
The receiver 30 shown in FIG.
A local oscillator 32;
A mixer 31 that mixes a local oscillation signal output from the local oscillator 32 and an input reception signal and converts the frequency into an intermediate frequency of a predetermined frequency band;
A bandpass filter 33 that receives an output from the mixer 31 and passes only an intermediate frequency component in a predetermined band; a variable gain amplifier 34 that amplifies the output from the bandpass filter 33;
A detector 35 for detecting the output from the variable gain amplifier 34;
Measuring means M for measuring the signal strength of the output from the variable gain amplifier 34 or the detector 35;
A control unit 36 for controlling each unit;
Various data such as an adjustment program and specified values are written, and a storage unit 37 capable of temporarily storing various data is provided.

The frequency band of the local oscillation frequency output from the local oscillator 32 is such that when the adjustment signal input is mixed in the mixer 31, intermediate frequency components are excluded outside the pass band of the bandpass filter 33. One frequency band of the first frequency band f ′ to be frequency-converted as described above and the second frequency band f to be frequency-converted to an intermediate frequency component of a predetermined frequency band that can pass through the band-pass filter. The local oscillation signal is output.
The control unit 36
Whichever of the two oscillation modes, the first oscillation mode in which the output of the local oscillator is the first frequency band f ′ or the second oscillation mode in which the output of the local oscillator is the second frequency band f Configured to be able to switch between
The control unit 36 further controls the variable gain so that the difference between the signal intensity in the second oscillation mode measured by the measuring means M and the signal intensity in the second oscillation mode becomes a specified value. The gain of the amplifier 34 is adjusted.
The first oscillation mode corresponds to the first amplification mode described in the claims, and the second oscillation mode corresponds to the second amplification mode described in the claims.
With the above configuration, when the local oscillation frequency output from the local oscillator 32 is set as the second frequency band f and mixed in the adjustment signal and the mixer 31, the frequency-converted intermediate frequency component is the bandpass Since the signal passes through the filter 33, a tone signal is output from the detector 35.
When the local oscillation frequency output from the local oscillator 32 is set to the first frequency band f ′ and mixed with the adjustment signal by the mixer 31, the frequency-converted intermediate frequency component passes through the bandpass filter 33. Since it is excluded out of the band and cannot pass, the tone signal is not output from the detector 35.

A procedure for adjusting the gain using the receiver 30 according to the third embodiment will be described.
First, the waveform generator G is connected to the receiver 30, the waveform generator G is operated, and the adjustment program stored in the storage unit 37 of the receiver 30 is operated.
The control unit 36 controls the local oscillator 32 and inputs the local oscillation frequency band to the mixer 31 as the first frequency band f ′.
Since the intermediate frequency component frequency-converted by the mixer 31 becomes a frequency outside the pass band of the band pass filter 33, the intermediate frequency component is blocked by the band pass filter 33. Therefore, the signal component output from the bandpass filter 33 becomes a signal in a state where the tone component of the adjustment signal is removed, that is, in a state where the adjustment signal is excluded, and the signal output from the detector 35. By measuring the signal strength of the component, the strength of the noise component of the signal output from the waveform generator G is measured. An example of the signal output from the detector 35 at this time is shown in FIG.
Then, the control unit 36 measures the signal strength in a state where the tone component of the adjustment signal has been removed by the signal strength measuring unit M, whereby the strength of the noise component of the signal output from the waveform generator G is measured. Is temporarily stored in the storage unit 37 as a signal intensity value at the time of removal.

Next, the control unit 36 controls the local oscillator 32 and inputs the local oscillation frequency band to the mixer 31 as the second frequency band f.
Since the intermediate frequency component frequency-converted by the mixer 31 becomes a frequency within the pass band of the band pass filter 33, the intermediate frequency component passes through the band pass filter 33 and is output. Therefore, the signal component output from the band pass filter 33 is in a state including the tone component of the adjustment signal. By measuring the signal intensity of the signal component output from the detector 35, the waveform generator G The intensity of the tone component of the adjustment signal to be output, that is, the signal intensity of the adjustment signal is measured. An example of the signal output from the detector 35 at this time is shown in FIG.
Then, the control unit 36 measures the signal strength including the adjustment carrier wave by the signal strength measuring unit M, and from this measured value, the signal strength value at the time of removal stored in the storage unit 37 is obtained. The signal intensity of the adjustment signal is subtracted and the gain is adjusted by adjusting the variable gain amplifier 34 so that the measured value matches the specified value stored in the storage unit 37.

According to the receiver 30 according to the third embodiment, even if the purity of the adjustment signal output from the waveform generator G is low, the first frequency band f ′ is changed to the second frequency band f. By setting the band-pass filter 33 sufficiently away from the band (the band-pass filter 33 is sufficiently away from the pass band), the local oscillation frequency is switched and the adjustment signal is eliminated, so that the waveform generator G It is possible to easily measure the intensity of only the noise component of the signal output from.
Therefore, according to the receiver 30 according to the third embodiment, the receiver 30 can be connected to the receiver 30 in a state where the waveform generator G is activated, and the adjustment program written in the storage unit 37 is activated. The gain can be easily and automatically adjusted to the specified value.
Further, since the band-pass filter 33 provided in the receiver is used for eliminating the signal for adjustment at the time of gain adjustment, the addition of an extra configuration can be minimized.
The present invention is not limited to a receiver having only one variable gain amplifier, but a variable gain amplifier is provided at a stage subsequent to a notch filter, an LSB band pass filter, a USB band pass filter, or the like. If so, a plurality of variable gain amplifiers may be provided to constitute a variable gain amplifier circuit as a whole. Thus, in a receiver including a plurality of variable gain amplifiers, the above-described gain adjustment method can be implemented in a variable gain amplifier disposed downstream of a notch filter, an LSB band pass filter, a USB band pass filter, or the like. Good.

The automatic gain adjustment technique according to the present invention is not limited to a receiver, and can be applied to gain adjustment in various electronic circuits including a variable gain amplifier circuit.

It is the block diagram which showed the structure of the receiver concerning Example 1 of this invention. It is a flowchart which shows the procedure which adjusts the said receiver. It is the figure which showed an example of the signal output from the said receiver. It is the block diagram which showed the structure of the receiver concerning Example 2 of this invention. It is the figure which showed an example of the signal output from the said receiver. It is the figure which showed the relationship between a carrier wave component, an upper sideband component, and a lower sideband component in an SSB signal. It is the block diagram which showed the structure of the receiver concerning Example 3 of this invention. It is the figure which showed an example of the signal output from the said receiver. It is the block diagram which showed the structure of the receiver of a prior art example. It is the figure which showed an example of the signal output from the said receiver.

Explanation of symbols

10 receiver,
11 Mixer,
12 local oscillators,
13 Bandpass filter,
14 variable gain amplifier,
15 detector,
16 control unit,
17 Memory unit,
18 Notch filter, band rejection filter,
19 switches,
L1 first signal path,
L2 second signal path,

20 receiver,
21 mixer,
22 Local oscillator,
24 variable gain amplifier,
25 Detector,
26 control unit,
27 storage unit,
28a Bandpass filter for LSB,
28b USB bandpass filter,
29 switches,
L21 first signal path,
L22 second signal path,

30 receiver,
31 mixer,
32 local oscillator,
33 Bandpass filter,
34 variable gain amplifier,
35 Detector,
36 control unit,
37 storage unit,

Claims (5)

A receiver including a variable gain amplifier circuit that amplifies an input signal,
A first amplification mode in which the adjustment signal input to the receiver is amplified in a state where the adjustment signal is excluded using a filter built in the receiver, or a state including the adjustment signal input to the receiver Control means for switching to one of the two amplification modes of the second amplification mode to be amplified at
Measuring means for measuring the signal strength in each of the two amplification modes ,
The filter is configured using a filter in which the frequency of the adjustment signal is outside its passband,
The control means may change the variable so that a difference between the signal intensity in the second amplification mode measured by the measurement means and the signal intensity in the first amplification mode measured by the measurement means becomes a specified value. A receiver configured to adjust a gain of a gain amplifier circuit. A first signal path comprising a band rejection filter for eliminating the adjustment signal as the filter;
A second signal path through which the adjustment signal is passed without being excluded;
Wherein the path of the adjustment signal, and a switch for switching to one of said first signal path or the second signal path,
The control means includes
In the first amplification mode is switched to the first signal path by controlling the switch, and outputs a signal for the adjustment input to the receiver to eliminate by the band rejection filter,
In the second amplification mode, is switched to the second signal path by controlling the switch, is passed through a not exclude input signal for said adjustment is configured to output to the receiver The receiver according to claim 1, wherein: A first signal path that excludes the adjustment signal by either one of the upper sideband filter or the lower sideband filter for SSB communication as the filter ;
A second signal path that passes through the other sideband filter without excluding the adjustment signal;
Wherein the path of the adjustment signal, and a switch for switching to one of said first signal path or the second signal path,
The control means includes
In the first amplification mode is switched to the first signal path by controlling said switch, a signal for adjustment input to the receiver to eliminate by the one of the sideband filter output And
In the second amplification mode, is switched to the second signal path by controlling the switch, that is configured to output without eliminating signal for adjustment input to the receiver The receiver according to claim 1, wherein: The receiver further includes:
A local oscillator,
A mixer that mixes a local oscillation signal output from the local oscillator and an input reception signal and converts the frequency into an intermediate frequency of a predetermined frequency band;
A band-pass filter that receives only an intermediate frequency component of a predetermined band by inputting an output from the mixer as the filter;
The variable gain amplifier circuit is configured to amplify the output from the band-pass filter,
The local oscillator includes a first frequency band to be frequency-converted into an intermediate frequency components outside the predetermined frequency band in the mixer, an intermediate frequency component of the predetermined frequency band in the mixer can pass through the band-pass filter It is configured to switch and output a local oscillation signal in any one of the second frequency bands to be frequency-converted,
The control means includes
In the first amplification mode, the output of the local oscillator is switched to the first frequency band. In the second amplification mode, the output of the local oscillator is switched to the second frequency band.
The gain of the variable gain amplifier circuit is such that the difference between the signal intensity in the second amplification mode measured by the measuring means and the signal intensity in the first amplification mode measured by the measuring means becomes a specified value. The receiver of claim 1, wherein the receiver is configured to adjust. A variable gain amplifier circuit for amplifying an input signal;
In a first amplification mode in which the adjustment signal input to the receiver is amplified in a state where the adjustment signal is excluded using a filter built in the receiver, or in a state including the adjustment signal input to the receiver Control means for switching to one of the two amplification modes of the second amplification mode to be amplified;
Measuring means for measuring the signal strength in each of the two amplification modes ,
The filter is a gain adjustment method for a receiver configured using a filter in which the frequency of the adjustment signal is outside its passband ,
Procedure 1 for controlling the control means to switch to the first amplification mode;
In the first amplification mode, a procedure 2 for measuring the signal intensity when the signal is amplified in a state where the adjustment signal input to the receiver is excluded using the measuring unit;
Procedure 3 for controlling the control means to switch to the second amplification mode;
In the second amplification mode, a procedure 4 for measuring the signal intensity when the signal is amplified in a state including the adjustment signal input to the receiver using the measurement unit;
And a step 5 of adjusting a gain of the variable gain amplifier circuit so that a difference between the signal strength measured in the step 2 and the signal strength measured in the step 4 becomes a specified value. Receiver gain adjustment method.

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