JPH021626A - Outdoor communication equipment - Google Patents

Abstract

PURPOSE:To permit a reference input to reduce the level fluctuation and higher harmonics components and to facilitate control on operation and performance by connecting phase locked oscillators for transmission and reception through the amplifier of a saturated operation, a band pass filter and a frequency divider. CONSTITUTION:First, the amplifier 5 is in the saturated operation and the fluctuation of an output level is set smaller than that of the reference input level. Second, the band pass filter 6 which passes the frequency of a reference input is connected in the output level of the amplifier 5 and therefore the higher harmonics components which are distorted in the output of the saturation operation is removed. To put it concretely, the frequency of the reference input shows 50MHz and level fluctuation shows 10dB, whereas level fluctuation is kept to + or -1.5dB at the output terminal of the band pass filter 6 in the temperature fluctuation of -40 deg.C to +85 deg.C. The higher harmonics components are set less than 40dBc. Such reference input signals are inputted to respective phase locked oscillators for transmission and reception 2 and 3 through the frequency divider 7. Thus, an outdoor communication equipment integrated with the phase locked oscillators which stably operate under severe conditions of the outdoors is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an outdoor communication device used for satellite communication and the like.

BACKGROUND OF THE INVENTION FIG. 2 shows a block diagram of a general satellite communication device (outdoor unit) as an example of a conventional technique.

The transmission signal (1GH2 band) transmitted from the outdoor unit is input manually from the transmission input terminal 8, and then sent to the transmission converter 1.
It is converted to the 14GHz band via.

It is output from the transmission output terminal 9. Also, the received signal (12G
Hz band) is input from the reception input terminal 11, converted to the 1 GHz band via the reception converter 4, output from the reception output terminal 1o, and transmitted to the indoor unit.

On the other hand, regarding the local oscillator system, the reference input signal (60 MHz band) is input from the reference input terminal 12 and divided into two via the divider 7, one of which is sent via the amplifier 13 to the phase-locked oscillator 2 for transmission. The other signal is input to the receiving phase-locked oscillator 3 via the amplifier 14. Then, a local source for the transmitting and receiving converters 1 and 4 is formed.

Problems to be Solved by the Invention Regarding such an outdoor unit in which a microwave band phase-locked oscillator is built-in, the reference input signal transmitted from the indoor unit may vary depending on the installation conditions of the outdoor unit. One issue is that the level fluctuates greatly. (For example, 50 MHz, 10 dB level fluctuation) In a phase-locked oscillator like the one shown in Figure 2, 50 MHz
It stabilizes by comparing the phases of the Z reference signal and local signals for transmission (13 (lrHz band) t... and reception (i o GHz band)).
and 1' with sufficient resistance to level fluctuations of the reference input signal.
It is extremely difficult to force stable movement. Also, the outputs of each of the amplifiers 13 and 14 are 1 novel and 1 novel;
It is difficult to embed the individual performance of each of 2 and 3 in the interphase Jtll optical vibration g due to the zero wave component etc.
Furthermore, each phase synchronized oscillator 2 of the transmitting and receiving system,
Three human power stages each require 13° and 14 amplifiers! 41
There are problems such as.

In order to solve the problems described above, an outdoor communication device t (at ,!!Connect the input terminal of a bandpass filter to the output/terminal of the sum-cut amplifier, and connect the input terminal r- of the divider to the output terminal of the bandpass filter.2.
The configuration is such that the two output terminals of the distribution Ig are connected in phase synchronization to oscillation NK of each of the QIJ records.

Operation book 1 (1) As in the configuration described in 1-5, by connecting the phase-locked total oscillator for transmitting and receiving through the saturation operation amplifier, band-pass filter, and distributor, the phase The basic human power for inter-JVJ optical oscillators is [...Since there is less bell fluctuation and harmonic components are reduced, it is easier to produce a single phase-locked optical oscillator in terms of performance.

Embodiment Fig. 1 is +1iJ,i (・(2yoru outdoor communication [1
An example of Pro Z Nogu of q (outdoor Yu, ゛-nodo) is shown. Components with the same effect as in FIG. 2 are given the same symbols.

The difference between FIG. 1 and FIG. 2 is that the amplifier 5
is a saturated operation, and the small fluctuations in the output 1 are small due to the fluctuations in the reference human power 1...Bel.Secondly, the output stage of the amplifier 3g5 is passed with the active input frequency A-: By connecting a 2-pass filter, the harmonic components intended for the saturated operation output can be suppressed.

Specifically, in this embodiment, the frequency of the reference input is 50M.
Hz, l/bel variation is 10 dB, whereas 1,
Temperature fluctuation -40"C at the output end of bandpass filter 6
Level fluctuations are kept within ±1.5 dB (4V) at ~85°C. Furthermore, harmonic components are also below 40 dBc. Such a reference input signal is passed through the distributor 7, and
It will be input to each phase synchronized oscillation ii2.3 for transmission and reception.

Effects of the Invention As is clear from the above embodiments, the present invention has the following effects.

In other words, in an outdoor communication device that has a phase-locked oscillator in a single source, by connecting the phase-locked oscillators for transmission and reception via a saturated amplifier, a bandpass filter, and a divider, each The reference signal at the reference signal input terminal of the phase-locked optical S unit has little level fluctuation and harmonic components are also reduced, and it has a built-in phase-locked oscillator that operates stably under harsh outdoor conditions.
An outdoor communication device can be realized. In addition, performance management of each phase-locked oscillator for transmission and reception becomes easier. become.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an outdoor communication device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional general outdoor communication device. 1...Computer for transmission, 2...Phase synchronization oscillator for transmission, 3...Phase synchronization camera for reception, 4...For reception Comparator, 5...
...Increase @B? is 8...Band pass filter, 7...Distributor. Name of agent: Patent attorney Toshio Nakao and one other person

Claims (1)

[Claims] The input terminal of a bandpass filter is connected to the output terminal of the amplifier of saturation operation, the input terminal of a distributor is connected to the output terminal of the bandpass filter, and one of the two output terminals of the distributor is connected to the transmission side station. An outdoor communication device connected to a phase-locked oscillator for transmission used as a source, and the other output terminal connected to a phase-locked oscillator for reception used as a reception-side station oscillator.