JPS5854742A - Frequency converting type repeater - Google Patents

Abstract

PURPOSE:To avoid the use of a lot of local oscillators, by converting frequencies to a channel without changing each local oscillating frequency, in a repeater having two channels. CONSTITUTION:An oscillator 25 oscillates frequency difference between input waves f1 and f2 or f2 and f1(f1-f2) and the frequency of the input wave f1 or f2 and the difference are frequency-mixed at a mixer 24. As a result, in the output of the mixer, the f1 and f2 always exist independently of the input (either f1 or f2), and the signals can be transmitted on the different channel from that for the input wave, by selecting one of the input waves. When the local oscillation frequency is denoted as (f1-f2), the frequency f2 is included in the mixed output when the input frequency is f1 and the frequency f1 is included in the mixed output when the input frequency is f2, allowing to perform desired frequency conversion by picking up the frequency.

Description

[Detailed description of the invention]

The present invention (regarding the method of the relay device of l-j FPU/STL equipment, when the SHF input wave is on one of two arbitrary channels, the frequency conversion type relay is used to convert the frequency to the other channel and transmit it. Regarding the device. Conventionally, this type of frequency conversion repeating device first converts the SHF input wave to an intermediate frequency (as shown in Fig. 1), and after fully amplifying the intermediate frequency, converts the SHF input wave to a frequency different from that of the input wave by using a frequency converter again. In Figure 1, 1 is a BPIi'' duplexer, 2 and 3iJ are all band p-wave devices with different frequencies, fl and f2, respectively, and 4 is a changeover switch for the band p-wave device. , 5 is a reception mixer, 7.8 is a local oscillator for fx and f2, 9 and 11 are intermediate frequency amplifiers, 10 is an intermediate frequency band F wave amplifier, 12 is a transmission mixer, 1
3.14 is a transmitting local oscillator, 15 is a band p-wave duplexer,
And 17.18 is a band p wave generator and each frequency 't
, f1. 20 is a selector switch for a band P-wave device, and 19 is an SHF amplifier. In Figure 1, fl
-+ is input and f2ffi is output, but by switching the changeover switches 4, 6, 16.20' in the opposite direction, it is possible to input % f2' and output fl. In this way, in the conventional system, it was necessary to prepare all four SHF local oscillators in order to change the transmitting and receiving frequency. SUMMARY OF THE INVENTION An object of the present invention is to provide a frequency conversion type repeater that can completely convert the frequency of a repeater having two channels to one channel without changing the local oscillation frequency of each channel. According to the present invention, a fixed oscillator signal with a frequency of the difference between two waves used as an SHF wave input wave (or output wave);
Mix I (F input) and select one wave of the output that is different from the input.

[7. A frequency conversion type relay device that outputs this is obtained. In other words, by mixing the input wave and all frequencies with an oscillator with a frequency (f1 to f2) that is the difference between the input wave f1 or f2 and the output wave f2 or flO, the mixer output has an input f
Whether it is l or f2, ft and f2 always exist, and by selecting one of the circles, it is possible to transmit on a channel different from the input wave. In other words, there is no need to switch the local oscillator or the like. Next, an embodiment of the present invention is shown in FIG. 2, and the present invention will be described in detail with reference to FIG. In the figure, 21 and 22 are frequencies f1 and 22, respectively. f2 input S HiIi' band P wave device, 2
3 is a selector switch for the band F wave generator, 24 is a mixer, 25 is an oscillator that oscillates at a frequency equal to the difference (f1 to f2) between two types of SHIi', 26 is a duplexer for the E wave generator, and 27.28 is a Frequency f1. f2 S ri F band P wave device, 2
Reference numeral 9 indicates a P-wave switch, and 30 indicates an SH'F amplifier. In the present invention, since the local oscillation frequency is (fl-, f2), when the input frequency is fl, the frequency f2 is in the mixed 111 power, and when the input frequency is f2, the frequency f1 is in the width of the mixed output. Each will be included, haha.
If you extract this, you can perform the desired frequency conversion. Figure 2 shows the case where the input frequency is f] and the output frequency is f2, but the inverse VC input frequency is f2 and the output frequency is f.
This can be done by switching the switch 23, 29. Although the input filters 21 and 22 can operate as a repeater without them, they are necessary to prevent interference from other station wave numbers. In the present invention, since local oscillation is unnecessary compared to the conventional one, the configuration is extremely simple, and the industrial effect thereof is great.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional frequency conversion type relay device, and FIG. 2 is a diagram showing an embodiment of the present invention. Agent Patent Attorney Susumu Uchihara ″□′・,′ 5−

Claims (1)

[Claims] A relay device that receives the entire frequency of one of two different predetermined frequencies and converts it to the other frequency, and includes a local oscillator that oscillates a frequency that is the difference between the two frequencies, and an input frequency and a local oscillation frequency. 1. A frequency conversion type relay device, characterized in that it is completely equipped with a mixer for mixing, and extracts and transmits another frequency different from the input frequency from the output of the mixer.