JPH08293814A - Telegraph radio equipment - Google Patents

Abstract

PURPOSE: To make a reception pitch frequency match with a side tone frequency, to precisely execute zero-in and to set manufacturing cost to be inexpensive. CONSTITUTION: A first local oscillator 2 generating a first local oscillation signal for transmitting/receiving a telegraph radio equipment and a second local oscillator 3 generating a second local oscillation signal are provided. A side tone is generated by frequency-dividing a phase comparison signal in the second local oscillator 3 by 1/100 and turning on/off the operation of an active low pass filter 56 in accordance with the turning on/off of a key K1. MPU 10 controlling the whole operation of the telegraph radio equipment controls the reception pitch frequency fp being a beat frequency and the side tone frequency fs, which are generated at the time of receiving a telegraph code, in such a way that they become equal. The reception pitch frequency fp can be changed by reception pitch frequency change-over switches SW3 and SW4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telegraph monitor circuit of a radio device for monitoring a telegraph code transmitted by operating an electric key.

[0002]

2. Description of the Related Art In a conventional telegraph radio, in order to monitor a telegraph code transmitted by operating a power key, a low frequency signal having a frequency of, for example, 700 Hz to 800 Hz, depending on the telegraph code. A side tone generator that oscillates is provided.

On the other hand, when receiving a telegraph, the received carrier signal is mixed with a frequency of a local oscillator deviated from the carrier frequency to generate a beat sound and receive a telegraph code. Here, since the tone of the beat sound can be changed by changing the frequency dial of the receiver, the operator sets and receives the tone with a desired pitch. At the time of transmission, the local oscillator signal generated by this local oscillator is used to generate the carrier wave signal for transmission, so if the frequency of the local oscillator at the time of reception is used as it is, the telegraph code is received for the carrier wave frequency of the received radio wave. When this happens, the transmission frequency shifts by the frequency of the "generated" or generated beat sound. Therefore, normally, the transmission frequency and the reception frequency are shifted by the local oscillator of one of the receivers by the beat frequency. Normally, this is 800Hz
The degree is fixed. That is, the reception pitch is 800H
z is fixed.

[0004]

In this case, since the operator's favorite reception pitch differs, the carrier frequencies of the transmissions are naturally different from each other. At this time, if the fixed reception pitch and side tone frequency are set to be the same, zero beat sound is generated by both the received signal and this side tone, and the carrier frequency of the received radio wave,
The transmission frequency can be matched. That is, so-called zero-in can be performed. At this time, when the frequency of the side tone and the frequency of the set pitch match, zero-in is possible, but a self-excited oscillator is used to generate the side tone, or the local oscillation signal generated by the local oscillator is accurately generated. There is a problem that correct zero-in cannot be performed unless the reception pitch is set properly. In order to solve this, it is necessary to use a low-frequency oscillator having an accurate oscillation frequency, a PLL circuit controlled by a CPU, and the like, and accurately shift the display frequency by that frequency during reception.

In order to solve the above problem, in another conventional radio device, a local oscillator for transmission and a local oscillator for reception are separately prepared, and a radio wave keyed during transmission is oscillated for reception. The frequency difference of the actual frequency is set to the frequency of the side tone and oscillated by a method such as monitoring at. Also, the local oscillation frequency of reception is made variable, and it is adopted as a monitor circuit linked to the reception pitch. In this wireless device, the desired reception pitch and the tone of the side tone are set separately and obtained. However, this other conventional example has a problem that the circuit configuration becomes complicated and the manufacturing cost becomes high.

An object of the present invention is to solve the above problems and to provide a telegraph radio which can make a reception pitch frequency and a side tone frequency coincident with each other and can accurately perform zero-in, and further reduce manufacturing cost. To provide.

[0007]

According to a first aspect of the present invention, there is provided a telegraph radio set for generating a local oscillation signal for transmission / reception of the telegraph radio set, and operating a power key. Correspondingly, second generating means for generating a sidetone for monitoring the telegraph code to be transmitted, a frequency of a reception pitch which is a beat frequency generated when the telegraph code is received, and a frequency of the sidetone. And a control means for controlling the first generation means and the second generation means so that and become equal to each other.

The telegraph radio set forth in claim 2 is characterized in that, in the telegraph radio set forth in claim 1, it further comprises setting means for setting the frequency of the reception pitch.

Further, the telegraph radio according to claim 3 is the telegraph radio according to claim 1 or 2, wherein the second generating means is the local oscillation signal or a local part different from the local oscillation signal. A side tone is generated by dividing the oscillation signal and turning on / off the divided signal according to the operation of the power key.

[0010]

In the telegraph radio set forth in claim 1 configured as described above, the first generating means generates a local oscillation signal for transmission / reception of the telegraph radio, and the second generating means. Generates a side tone for monitoring the telegraph code to be transmitted in response to the operation of the power key. The control means sets the first generation means and the second generation means so that the frequency of the reception pitch, which is the beat frequency generated when receiving the telegraph code, becomes equal to the frequency of the side tone. Control the generating means.

In the telegraph radio set forth in claim 2, the setting means sets the frequency of the reception pitch.

Further, in the telegraph radio set forth in claim 3, the second generating means divides the frequency of the local oscillation signal or a local oscillation signal different from the local oscillation signal, and the power key. Side tone is generated by turning on / off the divided signal according to the operation of.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a telegraph radio equipped with a telegraph monitor circuit according to an embodiment of the present invention. As shown in FIG. 1, the telegraph radio of this embodiment has a first local oscillator 2 for generating a first local oscillation signal for transmission / reception of the telegraph radio and a second local oscillator 2 for generating a second local oscillation signal.
And a local oscillator 3, frequency-dividing the phase comparison signal in the second local oscillator 3 by 1/100, and a power key K1.
The active low-pass filter 56 according to the on / off state of the
Side tone is generated by turning on and off the operation of. Here, the MPU (microprocessor unit) 10 that controls the overall operation of the telegraph radio has a reception pitch frequency fp, which is a beat frequency generated when receiving a reception code, and the side tone frequency fs. Control to be equal. The reception pitch frequency fp
Can be changed by the reception pitch frequency changeover switch SW3, and the sign of the reception pitch frequency fp can be changed by the reception pitch frequency sign changeover switch SW3.

Here, when the switch SW4 is switched to the a side and the switches SW1 and SW2 are switched to the a side, the MPU 10 sets fp = 650 Hz,
When the switches SW1 and SW2 are switched to the b side f
p = 750Hz, switch SW1, SW2 is c
Set to fp = 850 Hz when switched to the side.
On the other hand, when the switch SW4 is switched to the side a,
When the switches SW1 and SW2 are switched to the side a, M
PU10 is set to fp = -650Hz, switch SW
1, when SW2 is switched to b side, fp = -750
Hz, and when the switches SW1 and SW2 are switched to the c side, fp = -850 Hz. In this embodiment, the case where the transmission frequency ft and the reception frequency fr match will be described, but the present invention is not limited to this.

In FIG. 1, the MPU 10 comprises a CPU for controlling, a ROM for storing a control program and data necessary for executing the control program, and a RAM used as a work area. Controls the overall operation of the radio. The transmission frequency ft and the reception frequency fr are set by rotating a dial connected to the rotary encoder R1, and their data are set by the MPU 10.
Is stored in the RAM incorporated therein. FIG.
In the above, the transmission / reception changeover switches SW1 and SW2 are switched in association with the a side or the b side, respectively, and when switched to the b side, the receiving state is set, while when switched to the a side, the transmission state is set.

In the receiving state, the MPU 10 has f _L1 =
The first local oscillator 2 is controlled so that data of 71.75 MHz + ft is output to the PLL type first local oscillator 2 to generate the first local oscillation signal of the frequency f _L1 and output to the mixer 45. On the other hand, in the receiving state, the MPU 10
Outputs the data of f _L1 = 71.75 MHz + ft + fp to the PLL type first local oscillator 2 and outputs the frequency f _L1.
The first local oscillator 2 is controlled so as to generate the first local oscillation signal and output it to the mixer 22. Therefore, the frequency of the difference between the reception signal and the transmission signal is controlled to be the reception pitch frequency fp.

The reference signal generator 7 generates a 30 MHz reference signal and outputs it to the 1 / M frequency divider 50. In response to this, the 1 / M frequency divider 50 changes the frequency of the input reference signal. , 1 / corresponding to M data set by MPU10
The frequency is divided by M and output to the phase comparator 51. The second local oscillator 3 includes a phase comparator 51, a low pass filter 52, a voltage controlled oscillator 53, and a 1 / N frequency divider 54, and is a PLL.
Type oscillator. Here, the phase comparator 51 compares the phase of the frequency-divided signal input from the frequency divider 50 with the frequency-divided signal output from the 1 / N frequency divider 54, which will be described later, to generate a voltage proportional to the phase difference. , A voltage controlled oscillator 53 via a low pass filter 52 having a predetermined cutoff frequency
Output to. A voltage-controlled oscillator (hereinafter referred to as VCO) 53 oscillates by changing the frequency according to the input DC voltage, and oscillates the oscillation signal with the mixer 4 and the 1 / N frequency divider 54.
And output to.

The mixer 4 mixes the 9.42 MHz oscillation signal generated by the reference signal generator 5 with the 61.875 MHz oscillation signal generated by the VCO 53 to obtain a bandpass center frequency of 71.295 MHz. By passing through the band pass filter 8 which has 71.295
The second local oscillation signal of MHz is generated and output to the mixers 25 and 42.

The 1 / N frequency divider 54 divides the frequency of the input oscillation signal by 1 / N corresponding to the N data set from the MPU 10, and the phase comparator 51 and the 1/100 frequency divider 5
5 is output. Therefore, the VCO 53 is the phase comparator 51.
It oscillates and outputs at a frequency such that the phase difference between the two signals input to is equal.

The 1/100 frequency divider 55 divides the frequency of the input signal by 1/100 to turn on the power key K1.
The sound is output to the speaker 32 via the active low-pass filter 56, the adder 30, and the low-frequency amplifier 31 whose operation is turned on / off according to the off, and the side tone is output from the speaker 32.

In this embodiment, the switches SW3 and S3
W4 is switched and fp = 650Hz or -650H
When set to z, the data of M = 464 is output to the 1 / M frequency divider 50, and the data of N = 957 is 1 / M.
Output to the N frequency divider 54. At this time, in the PLL balanced state, the VCO 53 generates and outputs an oscillation signal of 61.875 MHz, and the frequency divider 54 outputs 64.655 ... kHz.
The frequency divider 55 generates and outputs a side tone of fs = about 650 Hz that matches the reception pitch frequency fp.

When the switches SW3 and SW4 are switched and set to fp = 750 Hz or −750 Hz, the data of M = 400 is output to the 1 / M frequency divider 50 and the data of N = 825 is set to 1 / N frequency divider 54
Output to. At this time, in the equilibrium state of the PLL, V
The CO 53 generates and outputs an oscillation signal of 61.875 MHz, and the frequency divider 54 outputs a signal of 75.0 kHz. Therefore, the frequency divider 55 outputs f equal to the reception pitch frequency fp.
A side tone of s = 750 Hz is generated and output.

Further, when the switches SW3 and SW4 are switched to set fp = 850 Hz or −850 Hz, the data of M = 352 is output to the 1 / M frequency divider 50 and the data of N = 726 is set to 1 / N frequency divider 5
4 is output. At this time, in the equilibrium state of the PLL,
Since the VCO 53 generates and outputs an oscillation signal of 61.875 MHz and the frequency divider 54 outputs a signal of 85.227 ... kHz, the frequency divider 55 causes the frequency divider 55 to match the reception pitch frequency fp at fs = about 850 Hz. Generates and outputs a side tone.

Therefore, in this embodiment, even if the changeover switches SW3 and SW4 are changed over, the oscillation signal generated by the VCO 53 is always 61.875 MHz.
However, the side tone output from the active low-pass filter 56 has the same frequency as the reception pitch frequency fp according to the switching position of the selector switch SW3.

In the reception state, the reception signal received by the antenna 1 is input to the mixer 22 via the high frequency amplifier 21 via the side b of the switch SW1, and the mixer 22 receives the input reception signal and F _L1 = 71.75 MHz + fr + fp generated by the first local oscillator 2
Then, the mixed signal is output to the band pass filter 23. The band pass filter 23 has a predetermined pass band width centered on the first intermediate frequency of 71.75 MHz, extracts the first intermediate frequency signal from the input signals, and passes it through the first intermediate frequency amplifier 24. And outputs it to the mixer 25. Mixer 25
Mixes the input first intermediate frequency signal and the second local oscillation signal output from the bandpass filter 8 and outputs the mixed signal to the bandpass filter 26. The band pass filter 26 has a predetermined pass band width centered on the second intermediate frequency 455 kHz, extracts the second intermediate frequency signal from the input signal, and outputs the second intermediate frequency amplifier 27.
To the mixer 28 via. The mixer 28 mixes the input second intermediate frequency signal and the reference signal of 455 kHz generated by the third local oscillator 6 to pass the mixed signal at a low frequency only.
Through, the beat sound having the reception pitch frequency fp indicating the existence of the carrier wave when the carrier wave is received is taken out and output to the speaker 32 via the adder 30 and the low frequency amplifier 31.

On the other hand, in the transmitting state, the operations of the intermediate amplifier 41 and the active low-pass filter 56 are turned on / off according to the turning on / off of the battery key K1. As a result, the first intermediate frequency signal generated by the third local oscillator 6 is input to the mixer 42 via the intermediate amplifier 41,
The mixer 42 receives the input first intermediate frequency signal 71.2.
The second local oscillation signal of 95 MHz is mixed, and the mixed signal is output to the mixer 45 via the band pass filter 43 and the intermediate amplifier 44 that extracts only the first intermediate frequency signal of 71.75 MHz, The first intermediate frequency signal is mixed with the mixer 45.
Output to. The mixer 45 mixes the input first intermediate frequency signal with the first local oscillation signal of ft + 71.75 MHz and extracts the mixed signal from only the transmission frequency band. The band pass filter 46 and the high frequency power amplifier 47. And output to the antenna 1 via the transmission / reception changeover switch SW1 a side, whereby the transmission signal in which the carrier wave of the transmission frequency ft is turned on / off according to the turning on / off of the battery key K1 is radiated from the antenna 1. It On the other hand, electric key K1
The active low-pass filter 56 according to the on / off state of the
Is turned on / off, the side tone signal is turned on / off and output from the speaker 32.

As described above, in the present embodiment, in the second local oscillator 2 by the PLL circuit which is provided for generating the local oscillation signal necessary for the transmission / reception operation and is controlled by the MPU 10, the PLL circuit is controlled by the MPU. The reference comparison input from the frequency divider 54 to the phase comparator 51 without changing the required local oscillation frequency (61.875 MHz) by controlling the frequency division number N and the frequency division number M with respect to the reference input frequency. The frequency of the signal can be changed. This reference comparison frequency is taken out and divided by the frequency divider 55 to 1/10.
After dividing by 0, it is passed through an active low pass filter 56 to generate a side tone low frequency signal, where:
The side tone is turned on / off according to turning on / off of the power key K1. On the other hand, the MPU 10 controls the reception frequency and generates the first local oscillation signal so that the reception pitch frequency fp having the same frequency as the obtained side tone frequency fs can be obtained. That is, the side tone frequency fs and the reception pitch frequency fp are interlocked and controlled to be equal.

In the present embodiment, as an example, the first local oscillator frequency is variable, and in the telegraph radio having the fixed second frequency local oscillator, the transmission / reception frequency can be changed by the first local oscillator 2. Therefore, the reception pitch frequency fp is set accurately by configuring the first local oscillator 2 with a PLL circuit type and changing the oscillation frequency of the transmission frequency and the reception frequency by the MPU 10 as described above. be able to. At this time,
The second local oscillator 3 is also composed of a PLL circuit similarly.

Here, in the above embodiments, a combination of one set of data M and data N for one reception pitch frequency fp is disclosed, but the present invention is not limited to this, and there are many combinations. . The frequency of the reference comparison signal output from the frequency divider 54 may be frequency-divided thereafter,
However, the frequency of the reference comparison signal is determined so as to have a multiple relationship with the required side tone frequency fs.
There are a plurality of these, and it is only necessary to set the combination that is closest to the multiple of the desired reception pitch. Naturally, there are combinations that exactly match and combinations that are slightly deviated, but in practical use, a deviation of several Hz or less can be used with almost no problem.

Further, in the present embodiment, the second local oscillator 2 is included in the PLL loop of the first local oscillator 2 described above, and the first local oscillator 2 is changed even if the oscillation frequency of the second local oscillator 2 changes. However, the frequency may be controlled so that the fluctuating frequency is corrected and the transmission / reception frequency is not affected comprehensively. In this case, the transmission / reception frequency is not affected even if the oscillation frequency shifts because the sidetone frequency fs is set accurately.

In the above embodiment, the reception pitch frequency fp is set in the first local oscillator 2, but the present invention is not limited to this and may be set in another local oscillator.

In the above embodiment, the sidetone is generated by dividing the phase comparison signal in the second local oscillator 3, but the present invention is not limited to this, and the first local oscillator 2 is not limited to this.
May be generated by dividing the output of.

[0033]

As described above in detail, according to the telegraph radio set forth in claim 1 of the present invention, the first generation means for generating a local oscillation signal for transmission / reception of the telegraph radio set, and the battery. Second generation means for generating a side tone for monitoring a telegraph code to be transmitted in response to a key operation, a frequency of a reception pitch which is a beat frequency generated when the telegraph code is received, and The control means controls the first generating means and the second generating means so that the frequencies of the sidetones become equal to each other. Therefore, the reception pitch frequency and the side tone frequency can be matched and the zero-in can be performed accurately, and the circuit configuration can be simplified, so that the manufacturing cost can be reduced.

The telegraph radio set forth in claim 2 further comprises setting means for setting the frequency of the reception pitch. Therefore, the frequency of the reception pitch and the frequency of the side tone can be set to a desired frequency in association with the operator's preference, and the operability can be improved as compared with the conventional example.

Further, in the telegraph radio set forth in claim 3, in the telegraph radio set forth in claim 1 or 2, the second generating means is the local oscillation signal or a local part different from the local oscillation signal. A side tone is generated by dividing the oscillation signal and turning on / off the divided signal according to the operation of the power key. Therefore, side tone can be generated with a simpler circuit configuration than the conventional example,
The manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a telegraph radio equipped with a telegraph monitor circuit according to an embodiment of the present invention.

[Explanation of symbols]

 1 ... Antenna, 2 ... 1st local oscillator, 3 ... 2nd local oscillator, 4, 22, 25, 28, 42, 45 ... Mixer, 5, 7 ... Reference signal generator, 6 ... 3rd local oscillator, 8 , 23, 26, 46 ... Band pass filter, 10 ... MPU (microprocessor unit), 21 ... High frequency amplifier, 24, 27 ... Intermediate frequency amplifier, 29, 52, 56 ... Low pass filter (LPF), 30 ... Addition , 31 ... Low frequency amplifier, 32 ... Speaker, 41, 44 ... Intermediate amplifier, 47 ... High frequency power amplifier, 50 ... 1 / M frequency divider, 51 ... Phase comparator, 53 ... Voltage controlled oscillator (VCO), 54 ... 1 / N frequency divider, 55 ... 1/100 frequency divider, K1 ... Power key, R1 ... Rotary encoder, SW1, SW2 ... Transmission / reception changeover switch, SW3 ... Reception pitch frequency changeover switch Pitch, SW4 ... sign change-over switch of receiving the pitch frequency.

Claims (3)

[Claims] 1. A first generating means for generating a local oscillation signal for transmission / reception of a telegraph radio, and a side tone for monitoring a telegraph code to be transmitted in response to operation of a power key. The second generation means and the first generation means and the second generation means are arranged so that the frequency of the reception pitch, which is the beat frequency generated when receiving the telegraph code, and the frequency of the side tone are equal. And a control means for controlling the generation means. 2. The telegraph radio according to claim 1, further comprising setting means for setting a frequency of the reception pitch. 3. The second generating means divides the frequency of the local oscillation signal or a local oscillation signal different from the local oscillation signal, and turns on the frequency-divided signal according to the operation of the power key. The telegraph radio according to claim 1 or 2, wherein a side tone is generated by turning it off.