JPS6349000Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a radio communication device convenient for monitoring the transmitted waves of its own station using a receiver while the radio device is transmitting.

When monitoring the radio waves transmitted by the own station, there is a problem in that, especially for SSB waves, the proper sound quality cannot be monitored unless the carrier positions of the demodulators match accurately. This invention corrects the above-mentioned problems, and includes a function to store the reception frequency and transmission frequency in the receiver, and a function to reduce reception sensitivity by applying a reception mute bias from the transmitter to the receiver during transmission. This is a wireless communication device that has the function of changing the reception frequency to the stored transmission frequency reception state using the reception mute bias.

To explain this in detail with respect to the illustrated circuit example, inside the transmitter 1, a transmitting/receiving switch 11 applies a mute bias 12 to the transmitting circuit during reception, thereby stopping the transmitter from operating. During transmission, the switch 11 is turned and the mute bias 12 is applied to the receiver through the communication circuit 13. As a result, the receiver stops operating during transmission, but when monitoring with the receiver, it is sufficient to adjust the depth of the mute bias to extremely reduce the receiver gain. However, since SSB is not demodulated unless the transmitting and receiving frequencies exactly match, it is not practical as a monitor in many cases.

In this device, a receiving frequency 21 and a transmitting frequency 22 are stored inside the receiver 2, and a switch 23 controlled by a mute bias 13 operates at the receiving frequency when receiving, and receives the transmitting frequency when transmitting. It is a switch.

In general, the frequency of the receiver is determined by the first or second local oscillation frequency and is set by a digital synthesizer method, so it is easy to accurately set and store the local oscillation frequency, so the present invention is not suitable for practical use. There is no problem at all.

[Brief explanation of the drawing]

The figure shows an example of the circuit configuration of the wireless communication device of the present invention. 1...Transmitter, 2...Receiver, 11, 23 ...
Switch, 21 ... Receive frequency memory, 22 ... Transmit frequency memory.

Claims (1)

[Scope of utility model registration request] A function that stores the reception frequency and transmission frequency in the receiver, a function that reduces reception sensitivity by a reception mute bias applied from the transmitter to the receiver at the time of transmission, and a function that changes the reception frequency to the memorized transmission frequency reception state by the reception mute bias. A wireless communication device with changing functions.