JPS59224929A - Communication control equipment - Google Patents

Abstract

PURPOSE:To keep a frequency difference between 2 sets of VFOs constant by providing a switch using in common a frequency setting clock input between inputs of each frequency data register to turn on the said switch thereby increasing/ decreasing frequency data of the data registers afterward in the same step. CONSTITUTION:A radio communication equipment is provided with two sets of digital VFOs 1A, 1B setting its frequency depending on increase/decrease in an input digital pulse, and frequency data registers 2A, 2B are connected respectively to both the VFOs 1A, 1B. A clock input is applied to each of the registers 2A, 2B via a switch 3 and an output of the VFOs 1A, 1B is given to an MIX via the switch 3. A switch 5 making the frequency setting of respective VFOs 1A, 1B common is provided between inputs 21, 22 of the registers 2A, 2B. Then the switch 5 is turned on, the frequency data for the registers 2A, 2B afterward is increased/decreased in the same step to make the frequency difference between the VFOs 1A, 1B constant, making the operation of the radio equipment stable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a wireless communication device using two digitally tuned VFOs, or a VFO equivalent to two digitally tuned VFOs.
This is related to O frequency setting.

Figure 1 shows an example of the configuration of a recent wireless communication device.
The input signal of T Yoshi is BPF (bandpass filter) and RF (
The high frequency amplification stage (in some cases may be omitted) is converted to an intermediate frequency by the MIX (frequency conversion stage), and the selectivity and amplification are gained by the IF (intermediate frequency amplification stage), in addition to the D (detection stage). There is. Assuming that the local oscillation frequency injected into the MIX is fL, the reception frequency is (IF frequency ±fL>), which one to use depends on the BPF band setting, and the other is the image frequency. Therefore, The receiving frequency can be determined and displayed only by the local oscillator frequency.BPF.

Even when a tuning circuit is provided as a substitute, in relatively simple radio receivers, the tuning circuit and local oscillation circuit are linked to simplify operation, but in general, in communication equipment, the input tuning circuit is operated independently. , the importance of the local oscillator in setting the reception frequency remains the same.

Therefore, in communication equipment, the local oscillator is called a VFO and is treated as an electrically and mechanically independent part with emphasis on frequency setting accuracy and frequency stability.

Also, recently, PLL is used to stably generate high frequencies.
(Phase Loeked Loop) A type of V that uses an oscillation circuit and sets the frequency by increasing or decreasing clock pulses.
FO is widely used and is hereinafter referred to as digital VFO.

The above was explained as a receiver circuit, but many recent communication devices have a transmitter-receiver type in which a receiver circuit and a transmitter circuit are housed in the same device. It can be said that the configurations are exactly the same, just the opposite, and VFO in particular is commonly used for both reception and transmission.

Also, like amateur radio transmitters, one transmitter has two
Increasingly, cameras are equipped with two or more VFOs. Assuming this as VFOfi--VFOB, (1) For example, if you are planning to communicate with a station on frequency A, and you cannot receive it due to airborne conditions or interference, set VFOA to frequency A,
Communicating with or intercepting stations on other frequencies via VFOB,
Switch to VFOA from time to time to monitor. (2) If you want to receive and transmit on separate frequencies, receive the signal on VF'OA and transmit on VFOB "t". (3) Operate VFOA and B at the same time to receive two frequencies at the same time. There is a way to use it.

In particular, the second term is that in the DX-1' station, a large number of stations desiring to communicate concentrate on one station.As a means to avoid the motherboard attack, the bedside station increases its receiving frequency by several kHz from the current transmitting frequency, or Usually specified as down, 2V can be switched instantly.
The FO method is advantageous.

In addition, amateur repeaters, which have recently been put into practical use in Japan, specify a specific frequency difference between the transmitting frequency and the receiving frequency, so mobile devices that frequently use repeaters automatically change the preset channel frequency when calling the repeater. However, it is possible to use a vFOtf machine for repeater service, so in a 2vFO machine, one VFO is tuned to match the transmitting wave number of the repeater, and reception is performed.
It is convenient to use the other VF'0 for transmission.

The operating frequency of this repeater is specified as a separate frequency within the same area to avoid interference, but the difference in frequency for transmission and reception is specified to be the same.For example, in amateur repeaters in Japan, the transmission frequency is 5 for the receiving frequency
It is supposed to take a higher MHz or Fi20 kHz.

As mentioned above, the present invention has been made to cope with applications where it is necessary or convenient to maintain a specific frequency difference between the transmitting frequency and the receiving frequency, and an embodiment thereof is shown and explained in Fig. 2. .

In FIG. 2, IA and IB are digital VFOs, and input data for setting the frequency is supplied from registers 2 and 2B, respectively, and the vFo output is selected by switch 3 and injected into the mixer. Register 2 is often actually an up/down counter (5), and the frequency data is obtained by increasing or decreasing the clock pulses applied to inputs 21A and 21B. Regarding the input switching of the glue Φ for determining the increase/decrease, the explanation is omitted because it has little relation to the subject matter, and it is not shown in the drawings. The clock input is selected by switch 4, but when using VFOA it is common to input to two registers, so connect switches 3 and 4 to side a, and when using VFOB connect to side b. Thus, it is convenient that switches 3 and 4 are linked.

In the present invention, by providing a "switch for commonizing the frequency setting input of both VFOs" 5 between the input 21A of the two registers and the input 21B of the register 2B, when the switch 5 is closed, Since the frequency data of the two registers and 2B thereafter increase and decrease in the same step, it is possible to set the frequency while keeping the frequency difference between both VFOs constant. In addition, switch 3, 4, 5
Of course, it is possible to use not only a mechanical Fi switch but also an electronic switch.

r et al.) FIG. 3 is an embodiment according to claim n, which has a configuration that is a further development of the configuration shown in FIG. 2. In Figure 3, VFO
is composed of one digital VFO 1, and its frequency setting data is switched so as to be supplied from either the two registers of the data selector 6 or the register 2B. A frequency setting clock is applied to the input 21A of the two registers through contact a of the input switch 4, and the input 21A of the register 2
A frequency setting clock signal is applied to the input 21B of the input switch 4 through the contacts of the input switch 4. It is convenient that the input switch 4 and the data selector 6 are connected to the same register side in conjunction with each other, and operate as a vFO selector.

In the present invention, a switch 5 is provided between the input 21A of the two registers and the input 21B of the register 2B. Once closed, the frequency data of the two registers and 2B will increase or decrease in the same step, so in effect, the frequency data of the two registers and 2B will increase or decrease in the same step.
It is possible to set the frequency while keeping the frequency difference between O and O constant.

As mentioned above, the present invention goes one step further than simply using two VFOs for different frequencies, and is particularly useful in DX-2 broadcasting, repeater communication, or satellite communication, which is often used in amateur radio communication. It is extremely effective when used to maintain a constant difference in transmission frequencies.

[Brief explanation of the drawing]

FIG. 1 shows an example of a block circuit of a wireless communication device, FIG. 2 shows an example of an implementation circuit of the present invention, and FIG. 3 shows another example of an implementation circuit of the invention. 1・IA・IB・・・Digital tuning VF0, 2A・2B
... Frequency data register, 3, 4, 5... Switch, 6... Data selector. Patent applicant Yaesu Musen Co., Ltd.

Claims (1)

[Claims] l. In a wireless communication device using two digitally tuned VFOs in which the frequency is set according to the increase or decrease of the input clock/main pulse, the frequencies of these two VFOs can be set independently. In addition, by providing a switch that commonizes the frequency setting clock input of the frequency data registers of both VFOs, it is possible to set the frequency while keeping the frequency difference between both VFO's constant. communication control device. ], in a radio communication device that uses two digitally tuned VFOs of the type that set the frequency by increasing or decreasing the input frequency and pulses, one digitally tuned VFO is used instead of two separate digitally tuned VFOs. As VFO frequency setting data,
By switching and inputting the output of separate frequency data registers, the same effect as using two VFOs can be obtained, and a switch is provided to commonize the frequency setting clock input of the separate frequency setting data registers. A communication control device according to claim 1, characterized in that: