JP2504205Y2 - Transmit radio wave monitor-device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor device in a transceiver using SSB and telegraph radio wave formats.

[0002]

2. Description of the Related Art Conventionally, transceivers of the SSB wave and telegraph radio wave formats share a BFO 53 and a local oscillator 50 as shown in FIG. 8 in order to monitor a transmission signal for the SSB transceiver. Is input from the microphone 42, and via the microphone amplifier 43 balanced modulator 44 and the filter 45, the transmitter side intermediate frequency amplifier 46 (hereinafter referred to as the transmission side IF 4
The signal was extracted from the latter stage of 6) and the latter stage of the power amplifier 48 of the transmitter via the mixer 47 on the transmission side and the buffer amplifier 58. The signal extracted from the latter stage of the transmission side IF 46 enters the reception side intermediate frequency amplifier 52 (hereinafter referred to as the reception side IF 52), passes through the filter 54, the demodulator 55, the low frequency amplifier 56, and becomes a voice signal from the speaker 57. Power amplifier 4
The signal extracted from between the antenna 8 and the antenna 49 is mixed with the signal from the local oscillator 50 by the reception side mixer 51 and then converted into an intermediate frequency, and the reception side IF 52, filter 54, demodulator 55, low frequency It becomes an audio signal through the amplifier 56 and the speaker 57.

Further, when transmitting a telegraph radio wave, a keying circuit 61 including a power key circuit 59, a crystal oscillator 60, and a buffer amplifier 58 is provided. In the case of FIG. 8, however, a transmitter side mixer 47 and a power amplifier are provided. Since it is provided between the power amplifier 48 and the power amplifier 48, the signal is extracted from the subsequent stage of the power amplifier 48 and the transmitted radio wave is monitored. Further, when the transmission signal by the electric key in the 7 [MHz] band or less is used, the keying circuit 61 is provided in the preceding stage of the transmission side IF 46, and the transmission side IF 46 is provided.
Signals are extracted from the latter stage of 46 and the latter stage of the power amplifier 48 to monitor the transmission signal.

Although the radio wave of the local station was monitored during the transmission by the circuit configuration as described above, only the frequency itself being transmitted can be monitored by these conventional ones, and the local oscillator 50 is temporarily changed. Even if the frequency is local, the frequency of the transmitted radio wave will change, so if you try to monitor the frequency around the transmitted radio wave, a receiver should be installed separately from this transceiver and a high frequency output (supplied to the antenna) There was no other way than to monitor the signal).
Also, when monitoring the intermediate frequency output, the transmission side IF46
Since the output of is only input to the receiving side IF 52, similarly, only the frequency itself being transmitted can be monitored,
It was impossible to monitor the frequencies around the transmitted radio waves.

[0005]

In view of the above-mentioned problems, the present invention provides a flexible configuration by adding a local oscillator whose frequency can be changed and a mixer for inputting the signal thereof in addition to the circuit configuration of a conventional transceiver. Another object of the present invention is to provide a transmission radio wave monitoring device capable of monitoring the frequency around the transmission signal.

[0006]

In a transceiver using an SSB wave and a telegraph wave in which a transmitter and a receiver are integrated, the frequency is variable between an intermediate frequency amplifier on the receiving side and a first mixer. By providing a second mixer for inputting the oscillation signal of the local oscillator, and changing the frequency of the local oscillator, it is possible to monitor the transmission radio wave of the local station and the periphery of the transmission radio wave of the local station.

[0007]

[Function] When there is an input from the microphone of the transmitter, it passes through the microphone amplifier, modulator, and filter, is input to the intermediate frequency amplifier, and is transmitted from the antenna through the mixer and power amplifier. The signal for monitoring is extracted from the output side and the output side of the power amplifier, the one from the intermediate frequency amplifier on the transmitting side is directly input to the mixer added by the present invention, and the one from the power amplifier is shared for transmission and reception. By inputting to the mixer added by the present invention through the mixer that injects the output of the local oscillator of the device, when trying to know the quality of the radio wave transmitted by itself, the frequency variable that outputs the signal to the mixer is used. By changing the frequency of the local oscillator, it is possible to observe and monitor what kind of signal exists within a frequency range of ± several kHz centering on the transmitted radio wave.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is used in a transceiver used in SSB wave and telegraph radio wave formats. As shown in FIGS. 1 and 2, the present invention is used in a circuit capable of both transmission and reception. It is what is done.

As shown in FIG. 1, which is one of the embodiments of the present invention, in the SSB transceiver, the microphone 1
When a voice signal is input, the signal is amplified through the microphone amplifier 2, and when a carrier is added by the BFO 4 (beat frequency oscillator) in the balanced modulator 3, only the upper side wave and the lower side wave appear, and the signal is Only one of the sidebands is taken out by the filter 5 and added to the transmission side intermediate frequency amplifier 6 (hereinafter referred to as the transmission side IF 6). IF6 on the transmitting side
Is a portion that amplifies the signal wave up to the power required to excite the SSB signal at the final stage power amplifier 8. In the case of the present invention, the output from between the transmission side IF 6 and the transmission side mixer 7 And the output from between the power amplifier 8 and the antenna 9, which is extracted from the transmission side IF 6, is fed to the second mixer 13 to the frequency variable local oscillator 12 (hereinafter referred to as variable local oscillator 1).
Not only the transmission signal that is input together with the signal from 2) but also an intermediate frequency of ± several kHz around the transmission frequency can be obtained.

What is extracted from the power amplifier 8 is first input to the first mixer 11 for inputting the signal of the local oscillator 10 to obtain a signal changed from a high frequency and then an IF on the transmitting side.
By tracing the same route as the extraction route from 6, and changing the output of the variable local oscillator 12 similarly to the extraction from the transmission side IF 6, it is possible to obtain an intermediate frequency of ± several kHz centering on the transmission frequency.

After that, the signal from the BFO 4 is input to the receiving IF 14, and the signal from the BFO 4 is input to the demodulator 16 for demodulation.
Monitoring is performed via the speaker 18.

As shown in FIG. 2, which is one of the embodiments of the present invention in the case of the electric wave format of the telegraph, the circuit (keying circuit) is generally a voice signal (the SSB wave in the case of the present invention).
It is built into a transceiver that sends and receives
The output of the crystal oscillator 21 that oscillates a carrier wave is changed by using an electric key operation circuit 19 that oscillates at the time of marking by the electric key operation and stops at the time of space and an unadjusted oscillation circuit Pierce oscillation circuit. The key signal is sent to the buffer amplifier 20 for preventing the stop and the key signal is sent to the power amplifier 8.

Further, in FIG. 2, the keying circuit is inserted at the post stage of the transmission side IF6, but it may be inserted at the post stage of the transmission side IF6 due to the difference in the transmission frequency band. Since the other circuits are the same as those in FIG. 1 below, the description thereof will be omitted.

Next, the mixer and the variable frequency local oscillator used in the present invention can use various circuits.
Some of the examples will be described below.

Regarding the mixer (mixer), several mixers can be used, and the mixer shown in FIG. 3 is a mixer by gate injection using the N-channel junction type FET 22, and the output of amplification is The output of the RF amplification is applied from the tuning circuit to G ₁ of the FET 22, and the local voltage is applied to G ₂ to obtain the intermediate frequency IF from the drain circuit through the IF output transformer 23.

FIG. 4 shows an example of a mixer by base injection using a transistor 24. This is because the received signal and the local oscillator signal are added to the same base. Therefore, when the level of the received signal is strong, the frequency of the local oscillator fluctuates, and in order to suppress the fluctuation, the capacitor C ₀
Set the capacity of 25 to the smallest possible value and set the IF output to IF.
Take out from the output transformer 26.

FIG. 5 shows a balanced mixer circuit in which junction FETs are push-pull connected. As shown in FIG.
F input transformer 27 and sources of FETs 28 and 29, I
The midpoints of the F transformers are all at zero voltage in terms of high frequency, and the phase difference between the gates and drains of the FETs 28 and 29 is 180 °. On the other hand, the local signal is transmitted to the FET2 by the coupling capacitors 30 and 31.
8, the same phase is applied to the gate of the FET 29. Also,
FET 28 flowing in the primary winding of the IF output transformer 32,
Since the magnetic fields generated by the drain current of the FET 29 have polarities that cancel each other out, the in-phase component of the conversion noise components included in the drain current is canceled, and the power of the conversion noise is 1/2 that of the single mixer, that is, 3
It is reduced by dB. In addition, since the balanced mixer has a push-pull connection, it has a wide dynamic range and is advantageous in terms of effective selectivity.

In FIG. 6, an RF signal is applied to an RF input terminal 33, which is a double balanced mixer using four diodes, and a local oscillator signal is applied to a local oscillator input terminal 34 so that an intermediate frequency output is output from an IF output terminal 35. can get. RF input transformer 3
6 and the local oscillator input transformer 37 are high frequency wide band transformers. The double balance means that the diodes and the secondary sides of the RF input transformer 27 and the local oscillator input transformer 37 are balanced with respect to the bias point as in the input circuit and the local oscillator circuit.

Regarding the frequency variable local oscillator 12 (variable local oscillator), it is possible to use a continuously variable frequency synthesizer using a PLL system capable of continuously varying the frequency, which is used for local oscillation of a transceiver. One of the embodiments of the present invention will be described.

In the block diagram of FIG. 7, 38 is a VFO for generating a reference frequency signal, 39 is a phase detector (P
D), 40 is a low pass filter (LPF), and 41 is a voltage controlled oscillator (VCO). Now, _assuming that the VFO oscillation frequency change ratio f _Rmax / f _Rmin and the VCO oscillation frequency change ratio f _COmax / f _COmin are approximately equal, the PLL
F _CO is locked to f _R by the same principle as in the above operation. Accordingly, within a range set to variable VFO38 in locked state, f _CO is always following the f _R f _R =
f _{CO and} can be locked at any frequency.
In this system, the VFO 38 corresponds to the reference oscillator of this frequency digital synthesizer. The frequency stability of this method is determined by the frequency stability of the VFO 38. In the present invention, the output f of the frequency digital synthesizer
_CO is input to the mixer 13 as an output f _CO variable frequency local oscillator 12. Further, this frequency digital synthesizer can be used not only as the mixer of the present invention but also as an oscillator for changing the frequency of a demodulator, a modulator or the like.

[0021]

According to the present invention, by adding a local oscillator whose frequency can be changed and a mixer for inputting its oscillation signal to the conventional circuit, only the same frequency as the frequency transmitted by the local station is monitored. In addition to the function, you can monitor the surroundings of your station's transmitted radio wave, so you can check the quality of your station's radio wave, and the effect is that you can constantly send clear radio waves to the other party.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a monitor device of the present invention.

FIG. 2 is a block diagram showing an embodiment when a power key circuit is used in the monitor device of the present invention.

FIG. 3 shows the FET gate (G ₂ ) in the mixer of the present invention.
Example of using an injection mixer.

FIG. 4 is an example of using a base injection mixer in the mixer of the present invention.

FIG. 5 is an example of using a balanced mixer in the mixer of the present invention.

FIG. 6 is an example of using a double balanced mixer in the mixer of the present invention.

FIG. 7 is a block diagram showing an embodiment of a continuously variable frequency synthesizer usable in the frequency variable local oscillator of the present invention.

FIG. 8 is a block diagram showing an outline of a conventional transmitted radio wave monitoring device.

[Explanation of symbols]

 1 Microphone 2 Microphone amplifier 3 Balanced modulator 4 BFO 5 Filter 6 Transmission side intermediate frequency amplifier (transmission side IF) 7 Transmission side mixer 8 Power amplifier 9 Antenna 10 Local oscillator 11 Reception side 1st mixer 12 Frequency variable local oscillator ( Variable station) 13 Receiving side second mixer 14 Receiving side intermediate frequency amplifier (receiving side IF) 15 Filter 16 Demodulator 17 Low frequency amplifier 18 Speaker 19 Key operation circuit 20 Buffer amplifier 21 Crystal oscillator 22 FET 23 IF output transformer 24 Transistor 25 Capacitor 26 IF output transformer 27 RF input transformer 28 FET 29 FET 30 Coupling capacitor 31 Coupling capacitor 32 IF output transformer 33 RF input terminal 34 Local input terminal 35 IF output terminal 36 RF input transformer 37 Local input transformer 8 VFO 39 Phase detector (PD) 40 Low pass filter (LPF) 41 Voltage controlled oscillator 42 Microphone 43 Microphone amplifier 44 Balanced modulator 45 Filter 46 Intermediate frequency amplifier 47 Transmitter side mixer 48 Power amplifier 49 Antenna 50 Local oscillator 51 Receiver side Mixer 52 Intermediate frequency amplifier 53 BFO 54 Filter 55 Demodulator 56 Low frequency amplifier 57 Speaker 58 Crystal oscillator 59 Key operation circuit 60 Crystal oscillator 61 Keying circuit

Claims (1)

(57) [Scope of utility model registration request] 1. In a transceiver that combines a transmitter and a receiver into one and uses a SSB wave and a telegraph wave having a shared circuit, between an intermediate frequency amplifier of the receiver and a first mixer on the receiving side. Is provided with a local oscillator whose frequency is variable and a second mixer for inputting an oscillation signal thereof, and by changing the frequency of the local oscillator, the transmission radio wave of the own station and the vicinity of the transmission radio wave of the own station are being transmitted. Transmitted radio wave monitoring device characterized by being able to monitor.