JPS5930330A - Digital frequency display system - Google Patents

Abstract

PURPOSE:To attain a convenient frequency display system, by constituting the system so that a frequency display device holds the transmssion frequency display when a full brake-in operation is selected at the switching of transmission/reception. CONSTITUTION:A VCO constitutes a PLL control oscillating circuit together with a reference oscillator, a programmable frequency divider and a phase comparator. A CPU stores a receiving frequency and supplies it to a display device, and when the CPU selects the full brake-in mode, the CPU stores and displays the transmission frequency at the 1st transmission. The CPU is provided with a timer having a prescribed time from the fall of a mark signal and when the next mark signal is inputted within the time, the transmission frequency of the display is held at if no input is given within the prescribed time, the display is restored to the receiving frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital frequency display method during full break-in operation of a CW transceiver.

The reason why we call it a CW transmitter/receiver here is because there are almost no CW-only machines in reality, and most of them are in SSB or AM/CW mode. Only the CW operation-related parts will be extracted and only the CW operation will be explained.

Figure 1 shows a typical example of the circuit configuration and frequency configuration (1) of a CW transceiver. During reception, the 1 000 kHz signal wave that has passed through the antenna 1 and the transmission/reception switching relay 2 is mixed with the local oscillation frequency of 4.55 kHz by the reception mixer 3 to become an intermediate frequency of 455 kHz, which is output by the detector 5. BFO
A tone signal of 1. kHz, which is the difference output from 456 kHz of 6.

At the time of transmission, the 455 kHz of the carrier oscillator 7 is mixed with the frequency of the local oscillator 4 by the transmission mixer 8 to obtain a transmission frequency. If the transmission frequency is the same as the reception frequency, there is no problem, so the explanation will be omitted. In order to set the transmission frequency to 101.0 kHz, the local oscillation frequency during transmission must be 1465 kHz.
Must be z. This is not a problem in the currently commonly used PLL oscillation circuits because it is easy to set the transmitting frequency and the receiving frequency separately.

For frequency display, the local frequency is corrected by the corrector 9 (-455 in this case) and digitally displayed on the display 10, so that the receiving frequency is displayed when receiving, and the transmitting frequency is displayed when transmitting. By the way, automatic transmission/reception switching methods during CW include a semi-break-in method and a full-plate t9) fin method. With semi-break-in, when a radio wave is emitted by pressing a certain key, even if you raise the key to stop the radio wave, the circuit remains in the transmitting state during the hold time, so the frequency display will not display during continuous transmission. This is the transmission frequency. On the other hand, with full break-in, radio waves are emitted in the transmitting state while the key is held down, but when the key is raised to the space, the radio waves are in the receiving state. The received frequency alternates rapidly, and the frequency display also changes accordingly, but as a practical matter, it is not possible to display two frequencies on one display, and frequency counter measurements cannot be performed correctly due to dart time. Since this is also impossible, the frequency display will display meaningless information during transmission.

This invention provides a CW transmitter/receiver having a 7-" digital frequency display, in which the frequency display maintains the transmit frequency display during keying when full break-in operation is selected for switching between transmit and receive. In a CW transmitter/receiver, the frequency display displays the received frequency during reception, and during full break-in transmission, the displayed frequency does not change even in the reception state when the signal is spaced. By maintaining the same transmit frequency as when marking, it is similar to semi-break-in (however, the feature of full break-in that can be received during space is lost), the receive frequency is displayed when receiving, and the transmit frequency is displayed when transmitting. A practical and convenient frequency display method % type % Next, we will discuss specific means for implementing the present invention, but it is mainly the transmitter/receiver that causes the above-mentioned frequency display problem. The local oscillation frequency of the CPU determines the transmitting frequency and the receiving frequency, and at the same time controls the frequency display.
Since the local oscillation circuit controlled by the CPU (Processor Unit) belongs to this category, the local oscillation circuit controlled by the CPU will be explained as an example.

FIG. 2 is a block diagram schematically showing the configuration of a CPU-controlled transmitter/receiver circuit. The receiving section and transmitting section in the figure are the same as those in FIG. 1, so details are omitted. Local oscillator 3 in Figure 1
corresponds to the VCO (voltage controlled oscillator) in Figure 2, and this V
The CO constitutes a PLL controlled oscillation circuit together with a spider reference oscillator, a programmable frequency divider, and a phase comparator. V
The frequency of the CO is determined by digital data supplied externally to a programmable frequency divider. Initially, an up/down counter was used, but now it can be implemented as part of the CPU function and can be used to preset the displayed value on the frequency display. Since correction and temporary storage are also performed by microprogramming, the operating conditions required by the present invention can be easily satisfied.

That is, the CPU stores the reception frequency in advance and supplies it to the display, but when the full break-in mode is selected, the CPU stores and displays the transmission frequency at the first transmission.

The CPU sets a timer for a certain period of time from the fall of the mark signal, and if the next mark signal is input within that time, the display transmission frequency is held; if the next mark signal is not input within the predetermined time, the display is ) Return to wave number. This hold time is generally 0.5 to 1
Approximately seconds are appropriate, but it is better to be able to adjust it according to the operator's preference, and in the case of an electric guitar, it is convenient to link it with VR for speed adjustment. Or measure the short and long points of the transmitted code with a software timer,
The optimal value (for example, about 10 times the dot) may be automatically held.

Furthermore, the gist of the present invention is not limited to frequency display, but can also be applied to mode display and other displays that differ between reception and transmission.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram for explaining the circuit configuration and frequency configuration of a CW transmitter/receiver, and FIG. 2 is a block diagram showing an outline of the configuration of a CPU-controlled transmitter/receiver circuit. 1...Antenna, 2...Transmission/reception switching relay, 3...
Reception mixer, 4... Local oscillator, 7... Carrier oscillator, 8... Transmission mixer. (6)

Claims (1)

[Claims] A CW transceiver having a digital frequency display, characterized in that the frequency display is configured to hold the transmission frequency during keying when full break-in operation is selected for switching between transmission and reception. method.