JPS58164333A - Monitor device of radio transmitter and receiver for cw - Google Patents

Abstract

PURPOSE:To obtain coincidence between a transmission and a reception frequency automatically when setting received beats to desired pitch by varying the BFO of a receiver, by varying a sine tone oscillation frequency by an equal extent associatively. CONSTITUTION:An IF signal sent out of an intermediate frequency amplifier and a beat signal from a BFO2 are supplied to a beat detector 1. A detection signal from the beat detector 1 is mixed by a mixer 4 with a side tone from a transmitting side tone 5 and then amplified by a low frequency amplifier 7, allowing a speaker 8 to sound. In this case, the variable capacitor 3 of the BFO2 and the variable capacitor 6 of the transmitting side tone 5 are put in associative operation to allow the frequency of the beat signal from the BFO2 and that of the transmitted side tone to coincide with each other at any time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a monitoring device in a CW radio transceiver, which is characterized in that the sidetone oscillator of the transmitter and the oscillation element of the BFO of the receiver are changed by an equal amount in conjunction with each other. be.

Conventionally, in a sidetone oscillator that is linked to the keying of a transmission and used to monitor the transmission code by oscillating only during radio wave oscillation, and also being supplied to the low frequency amplifier of the receiving section, the oscillation frequency of the sidetone is Since it is fixed or semi-fixed, the transmitting carrier oscillator and receiving BFO (beat frequency oscillator)
tor) are adjusted in advance so that their respective oscillation frequencies match.

Therefore, if the other station is received with a beat tone of the same tone as the pitch of the side tone and transmitted at that frequency, the transmitting and receiving frequencies will match.

The present invention has been made in view of this point, and it changes the BFO of the receiver to match the received beat to the desired pitch, and accordingly changes the oscillation frequency of the sidetone by an equal amount to match the transmitting and receiving frequencies. The object of the present invention is to provide a monitoring device that allows

Embodiments of the present invention will be described in detail below with reference to the drawings.

IF sent out from the preceding intermediate frequency amplifier (not shown)
The beat signal from the BFO2 is also supplied to the beat detector 1, although the double signal is supplied to the beat detector 1.

The detected signal detected by the beat detector l is mixed with the sidetone from the transmitting sidetone 5 in the mixer 4, and then amplified by the low frequency amplifier 7 to cause the speaker 8 to sound.

Note that a changeover switch may be used instead of the mixer 4 to switch between the transmitter side and the receiver side.

In such a configuration, the variable capacitor 3 of BFo2
By interlocking the variable capacitor 6 of the transmission sidetone 5 with the frequency of the beat signal from the BFO 2, the frequency of the beat signal from the BFO 2 and the frequency of the transmission sidetone constantly change to match.

Figure 1 shows the case where variable capacitors 3 and 6 are linked, and Figure 2 shows the case where variable inductance is used instead of the variable capacitor.
Corresponding to variable capacitors 3 and 6 are variable inductances 9 and lO.

Of course, a variable capacitor and variable inductance can also be combined.

Further, in FIG. 3, a means for generating a sidetone by mixing an appropriate frequency with the BFO signal is shown, in which 2 is a BFO, 3 is a variable capacitor for varying the frequency of BFO2, and 5 is 4 is a sidetone generator, and 4 is a mixer for mixing the BFO signal with the output from the sidetone generator 5. This sidetone signal is used to mix the detected signal from the beat detector with the mixer. , amplify it with a low frequency amplifier and make the speaker sound.

As detailed above, in the present invention, it is possible to provide a monitor circuit for a CW radio transceiver in which the frequencies of BFO and transmission sidetone are matched with each other with an extremely simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the configuration in which variable capacitors are linked and changed by the same amount in the present invention, FIG. 2 is a diagram showing a case where a variable inductance is used in place of the variable capacitor in FIG. 1, and FIG. This is a dispute showing a means of generating sidetones by mixing an appropriate frequency with the BFO signal. 1...Beat detector, 2...BFo, 3.6...
Variable capacitor, 4... Mixer, 5... Transmission site generator, 7... Low frequency amplifier, 8... Speaker, 9, 10... Variable inductance.

Claims (1)

[Claims] 1. A CW radio transceiver having a beat detector that detects a beat signal from an IF multiplied signal BFO, and a switch that switches between the signal from the beat detector and a transmission sidetone, The variable capacitors or variable inductances of the BFO and sidetone oscillators can be linked to change the same amount, or both the oscillators can be connected to the VCO.
A monitoring device for a CW radio transmitter/receiver, characterized in that the CW radio transmitter/receiver is changed by an equal amount. 2. The monitoring device for a CW radio transceiver according to claim 1, wherein a suitable frequency is added to the BFO signal and mixed in a mixer to generate a sidetone.