JP2847925B2 - Wireless transceiver - Google Patents
Wireless transceiverInfo
- Publication number
- JP2847925B2 JP2847925B2 JP2189646A JP18964690A JP2847925B2 JP 2847925 B2 JP2847925 B2 JP 2847925B2 JP 2189646 A JP2189646 A JP 2189646A JP 18964690 A JP18964690 A JP 18964690A JP 2847925 B2 JP2847925 B2 JP 2847925B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- reception
- signal
- transmission
- intermediate frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Monitoring And Testing Of Transmission In General (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は無線送受信装置に係り、特に無線回線折り返
し試験回路を有する無線送受信装置に関する。Description: TECHNICAL FIELD The present invention relates to a radio transmission / reception apparatus, and more particularly, to a radio transmission / reception apparatus having a radio loopback test circuit.
（従来の技術） 無線回線折り返し試験回路を有する無線送受信装置と
しては、従来、例えば第４図に示すものが知られてい
る。第４図において、無線回線折り返し試験回路は、送
信周波数と受信周波数の差周波数の信号を発生する折り
返し用の発振器41と、送信機１から送信アンテナ３への
出力信号２の一部と発振器41の出力信号とを混合し受信
周波数の信号を形成出力するミキサ42と、受信アンテナ
６からの受信信号５とミキサ42の出力信号とを切り換え
て受信機４へ出力するスイッチ（SW）43とで構成され
る。(Prior Art) As a radio transmission / reception apparatus having a radio loopback test circuit, for example, the one shown in FIG. 4 is conventionally known. In FIG. 4, a loopback test circuit for a radio line includes an oscillator 41 for aliasing that generates a signal having a difference frequency between a transmission frequency and a reception frequency, a part of the output signal 2 from the transmitter 1 to the transmission antenna 3 and the oscillator 41. And a switch (SW) 43 for switching between the reception signal 5 from the reception antenna 6 and the output signal of the mixer 42 and outputting the signal to the receiver 4 by mixing the output signal of the mixer 42 with the output signal. Be composed.
本来の送受信動作は次のようになる。送信機１は高周
波部101と中間周波部102を含むが、中間周波数102の出
力信号は高周波部101にて送信周波数の信号たる高周波
信号へ変換され、増幅等される。これは送信機１の出力
信号２として送信アンテナ３から放射される。The original transmission / reception operation is as follows. The transmitter 1 includes a high-frequency unit 101 and an intermediate-frequency unit 102. An output signal of the intermediate frequency 102 is converted into a high-frequency signal as a transmission frequency signal by the high-frequency unit 101 and amplified. This is radiated from the transmitting antenna 3 as the output signal 2 of the transmitter 1.
一方、SW43は通常の送受信動作では受信アンテナ６の
出力を選択するようになっているので、受信アンテナ６
で受信された受信信号５はSW43を介して受信機４に入力
する。受信機４は高周波部401と中間周波部402とを含む
が、受信信号５は高周波部401にて増幅、中間周波数へ
の変換がなされて中間周波数402へ入力し、受信処理さ
れる。On the other hand, the SW 43 selects the output of the receiving antenna 6 in a normal transmission / reception operation.
The received signal 5 received at is input to the receiver 4 via the SW43. The receiver 4 includes a high-frequency unit 401 and an intermediate frequency unit 402. The received signal 5 is amplified and converted to an intermediate frequency by the high-frequency unit 401, input to the intermediate frequency 402, and subjected to reception processing.
次に、当該無線送受信装置単独で動作試験を行う場合
は、SW43を切り換えてミキサ42の出力を選択させる。そ
の結果、送信機１の出力信号２がミキサ42にて受信信号
５と同じ周波数の信号へ変換されて受信機４に入力す
る。即ち、送信側の中間周波数102、高周波部101、受信
側の高周波部401、中間周波部402の順に信号が通過し、
送信系と受信系の総合的な試験が行われる。Next, when the operation test is performed by the wireless transmission / reception device alone, the output of the mixer 42 is selected by switching the SW 43. As a result, the output signal 2 of the transmitter 1 is converted into a signal having the same frequency as the reception signal 5 by the mixer 42 and input to the receiver 4. That is, the signal passes in the order of the intermediate frequency 102 on the transmitting side, the high frequency unit 101, the high frequency unit 401 on the receiving side, and the intermediate frequency unit 402,
A comprehensive test of the transmission system and the reception system is performed.
（発明が解決しようとする課題） 上述した従来の無線回線折り返し試験回路では、障害
が生じた際に、総合的な試験はできても、高周波部に障
害があるのか中間周波部に障害があるのか判別すること
ができないので、障害箇所の判別や復旧に時間がかかる
という問題がある。(Problems to be Solved by the Invention) In the above-described conventional radio circuit loopback test circuit, when a fault occurs, even if a comprehensive test can be performed, there is a fault in the high frequency part or a fault in the intermediate frequency part. Since it is not possible to determine whether a failure has occurred, there is a problem that it takes time to determine and recover from a failure.
即ち、原因究明の立場からすれば総合的試験のみなら
ず高周波部と中間周波部のいずれに障害があるかの判別
もなし得るようにすべきであるが、従来の試験回路には
その配置がなされていないのである。これは、従来の無
線送受信装置の構成が中間周波数帯での折り返し試験を
容易に行えるようにはなっていないことに原因の一端が
ある。In other words, from the standpoint of investigating the cause, it should be possible not only to perform a comprehensive test but also to determine whether the high-frequency part or the intermediate-frequency part is faulty. It has not been done. This is partly due to the fact that the configuration of the conventional wireless transmitting and receiving apparatus does not easily perform the loopback test in the intermediate frequency band.
周知のように、高周波信号と中間周波信号との変換
は、この両者の差の周波数を発生するローカル発振器の
信号を混合することによって行われるが、送受信周波数
の高速切替が必要なとき等には、このローカル発振器の
出力信号を送受共用にすることがしばしば行われる。こ
のような場合、送受の中間周波数は任意に設定されるの
で、送受の中間周波数差は送信周波数と受信周波数の差
とは異なることになる。従って、中間周波数帯での折り
返し試験を行うとすれば総合的試験回路とは別に専用の
試験回路を構成する必要がある。これは装置の大型化、
高価格化等を招来するので、装置には組み込まれていな
いのが実状である。As is well known, conversion between a high-frequency signal and an intermediate frequency signal is performed by mixing signals of a local oscillator that generates a frequency of a difference between the two signals. Often, the output signal of the local oscillator is shared for transmission and reception. In such a case, the intermediate frequency for transmission and reception is set arbitrarily, so that the intermediate frequency difference between transmission and reception is different from the difference between the transmission frequency and the reception frequency. Therefore, if a loopback test is performed in the intermediate frequency band, it is necessary to configure a dedicated test circuit separately from the comprehensive test circuit. This is a bigger device,
In reality, they are not incorporated into the apparatus because they cause high price.
本発明は、このような問題に鑑みなされたもので、そ
の目的は、総合的試験のみならず障害箇所の判別をも容
易になし得る無線回線折り返し試験回路を有する無線送
受信装置を提供することにある。The present invention has been made in view of such a problem, and an object of the present invention is to provide a wireless transmission / reception apparatus having a wireless circuit loopback test circuit capable of easily performing not only a comprehensive test but also a failure point determination. is there.
（課題を解決するための手段） 前記目的を達成するために、本発明の無線送受信装置
は次の如き構成を有する。(Means for Solving the Problems) In order to achieve the above object, a wireless transmission / reception device of the present invention has the following configuration.
即ち、第１発明の無線送受信装置は、送信中間周波部
と送信高周波部とを含む送信機と；受信高周波部と受信
中間周波部とを含む受信機と；で構成される無線送受信
装置において；送信中間周波数と受信中間周波数との差
周波数を送信周波数と受信周波数との差周波数に等しく
設定し；前記差周波数の信号を発生する発振器と；前記
送信高周波部から送信アンテナへの出力信号の一部と前
記発振器の出力信号とを混合し受信周波数の信号を形成
する第１のミキサと；前記第１のミキサの出力信号と受
信アンテナからの受信信号とを切り換えて前記受信高周
波部へ出力する第１のスイッチと；前記送信中間周波部
から前記送信高周波部への出力信号の一部と前記発振器
の出力信号とを混合し受信中間周波数の信号を形成する
第２のミキサと；前記第２のミキサの出力信号と前記受
信高周波部の出力信号とのいずれか一方を切り換えて前
記受信中間周波部へ出力する第２のスイッチと；を備え
たことを特徴とするものである。That is, a wireless transmitting / receiving apparatus according to a first aspect of the present invention is a wireless transmitting / receiving apparatus including: a transmitter including a transmitting intermediate frequency section and a transmitting high frequency section; and a receiver including a receiving high frequency section and a receiving intermediate frequency section; A difference frequency between the transmission intermediate frequency and the reception intermediate frequency is set equal to a difference frequency between the transmission frequency and the reception frequency; an oscillator for generating a signal having the difference frequency; and an output signal from the transmission high-frequency unit to a transmission antenna. A first mixer for mixing the output signal of the oscillator with the output signal of the oscillator to form a signal of a reception frequency; switching between the output signal of the first mixer and the reception signal from the reception antenna to output to the reception high-frequency section A first switch; a second mixer for mixing a part of an output signal from the transmission intermediate frequency section to the transmission high frequency section with an output signal of the oscillator to form a signal of a reception intermediate frequency; It is characterized in further comprising a; a second switch for outputting to the receiving intermediate frequency section switching one of the second output signal and the output signal of the receiving radio-frequency unit of the mixer.
また、第２発明の無線送受信装置は、送信中間周波部
と送信高周波部とを含む送信機と；受信高周波部と受信
中間周波部とを含む受信機と；で構成される無線送受信
装置において；送信中間周波数と受信中間周波数との差
周波数を送信周波数と受信周波数との差周波数に等しく
設定し；前記差周波数の信号を発生する発振器と；前記
送信高周波部から送信アンテナへの出力信号の一部と前
記送信中間周波部から送信高周波部への出力信号の一部
とを切り換えて出力する第１のスイッチと；前記第１の
スイッチの出力信号と前記発振器の出力信号とを混合し
受信周波数の信号と受信中間周波数の信号を形成出力す
るミキサと；前記ミキサの出力信号を受けて受信周波数
の信号と受信中間周波数の信号とを切り換えて出力する
第２のスイッチと；受信アンテナからの受信信号と前記
第２のスイッチの出力信号たる受信周波数の信号とを切
り換えて前記受信高周波部へ出力する第３のスイッチ
と；前記受信高周波部の出力信号と前記第２のスイッチ
の出力信号たる受信中間周波数の信号とを切り換えて前
記受信中間周波部へ出力する第４のスイッチと；を備え
たことを特徴とするものである。Further, a wireless transmitting / receiving apparatus according to a second aspect of the present invention is a wireless transmitting / receiving apparatus including: a transmitter including a transmission intermediate frequency unit and a transmission high frequency unit; and a receiver including a reception high frequency unit and a reception intermediate frequency unit; A difference frequency between the transmission intermediate frequency and the reception intermediate frequency is set equal to a difference frequency between the transmission frequency and the reception frequency; an oscillator for generating a signal having the difference frequency; and an output signal from the transmission high-frequency unit to a transmission antenna. And a first switch for switching and outputting a part of the output signal from the transmission intermediate frequency unit to the transmission high frequency unit; and a reception frequency mixing the output signal of the first switch and the output signal of the oscillator. A mixer for forming and outputting a signal of the intermediate frequency and a signal of the intermediate frequency; a second switch for receiving the output signal of the mixer and switching and outputting the signal of the intermediate frequency and the signal of the intermediate frequency; A third switch that switches between a reception signal from a reception antenna and a signal of a reception frequency that is an output signal of the second switch and outputs the signal to the reception high-frequency unit; an output signal of the reception high-frequency unit and the second switch And a fourth switch for switching between the output intermediate signal and the reception intermediate frequency signal and outputting the signal to the reception intermediate frequency section.
（作 用） 次に、前記の如く構成される本発明の無線送受信装置
の作用を説明する。(Operation) Next, the operation of the wireless transmission / reception device of the present invention configured as described above will be described.
本発明の無線送受信装置によれば、送信中間周波数と
受信中間周波数との差周波数を送信周波数と受信周波数
との差周波数に等しく設定してあるので、折り返し用の
発振器を共用して高周波帯での折り返し試験と、中間周
波数帯での折り返し試験とが行える試験回路を構成で
き、総合的試験のみならず障害箇所の判別を容易に行う
ことができる。According to the wireless transmission / reception device of the present invention, the difference frequency between the transmission intermediate frequency and the reception intermediate frequency is set to be equal to the difference frequency between the transmission frequency and the reception frequency. A test circuit capable of performing the loopback test in the intermediate frequency band and the loopback test in the intermediate frequency band can be configured, so that not only the comprehensive test but also the failure location can be easily determined.
（実 施 例） 以下、本発明の実施例を図面を参照して説明する。Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例に係る無線送受信装置を示
す。まず、本発明の無線送受信装置は、送受信を行う際
のローカル発振器（図示省略）は送受共用であるが、従
来とは異なり本発明では、第２図に示すように送信周波
数FTと受信周波数fRとを差周波数f1だけ離して設定し、
かつ、送信中間周波数fITと受信中間周波数fIRとを同じ
差周波数f1だけ離して設定してある。従って、ローカル
周波数fLはfT−fIT＝fR−fIRの位置に設定される。FIG. 1 shows a wireless transmitting / receiving apparatus according to an embodiment of the present invention. First, the wireless transceiver of the present invention is a local oscillator at the time of transmitting and receiving (not shown) are duplexer, in the present invention is different from the conventional, a transmitting frequency and a receiving frequency F T as shown in FIG. 2 f R and the difference frequency f 1
In addition, the transmission intermediate frequency f IT and the reception intermediate frequency f IR are set apart by the same difference frequency f 1 . Accordingly, the local frequency f L is set to the position of f T -f IT = f R -f IR.
このような無線送受信装置において、第１実施例に係
る折り返し試験回路は、１つの発振器70と、２つのミキ
サ71,同72と、２つのスイッチ（SW）80,同81とで構成さ
れる。In such a wireless transmission / reception device, the loopback test circuit according to the first embodiment includes one oscillator 70, two mixers 71 and 72, and two switches (SW) 80 and 81.
第１図において、無線回線折り返し試験を行う場合に
は、送信機１の出力信号２は、分岐されて（第１の）ミ
キサ71に入力される。このミキサ71では、送受の周波数
差f1の信号を発生する発振器70からの信号によって出力
信号２の受信周波数の信号74への変換が行われる。スイ
ッチ80は、アンテナからの受信信号５と変換された信号
74とのいずれか一方を選択するもので、折り返し試験の
ときは変換された信号74を選択し、受信機４に入力す
る。In FIG. 1, when performing a wireless loopback test, the output signal 2 of the transmitter 1 is branched and input to the (first) mixer 71. In the mixer 71, it converted to a signal 74 of the receiving frequency of the output signal 2 by a signal from an oscillator 70 which generates a signal of a frequency difference f 1 of transmission and reception is performed. The switch 80 receives the signal 5 from the antenna and converts the signal.
74. In the case of a loopback test, the converted signal 74 is selected and input to the receiver 4.
これによって送信機１の中間周波部102、高周波部10
4、受信機４の高周波部401、中間周波部402を順に通る
系の試験が行える。これは従来例で説明したと同じ高周
波帯での折り返し試験である。Thereby, the intermediate frequency section 102 and the high frequency section 10 of the transmitter 1
4. A test of a system that sequentially passes through the high frequency unit 401 and the intermediate frequency unit 402 of the receiver 4 can be performed. This is a folding test in the same high-frequency band as described in the conventional example.
次に、折り返しを中間周波数帯において行う場合につ
いても述べる。この場合、送受の中間周波数の差も同様
にf1であることから、折り返し用の発振器70は共用する
ことができる。Next, a case where the return is performed in the intermediate frequency band will be described. In this case, since the difference between the intermediate frequency of transmission and reception is equally f 1, oscillator 70 for folding can be shared.
送信中間周波数信号103は、（第２の）ミキサ72で受
信中間周波数の信号403に変換され、（第２の）スイッ
チ81で同様に選択が行われ、受信機４の中間周波部402
に入力される。これによって送信機１の中間周波部102
と受信機４の中間周波数402とを通る系の試験が行え
る。The transmission intermediate frequency signal 103 is converted to a reception intermediate frequency signal 403 by a (second) mixer 72, similarly selected by a (second) switch 81, and is output to an intermediate frequency section 402 of the receiver 4.
Is input to Thereby, the intermediate frequency unit 102 of the transmitter 1
A test can be performed on a system that passes through and the intermediate frequency 402 of the receiver 4.
障害が発生した場合、上記の２つの試験を行うことに
より、障害が高周波部であるのか、中間周波部であるの
かを判別することができる。When a failure occurs, by performing the above two tests, it is possible to determine whether the failure is a high-frequency part or an intermediate-frequency part.
次に、第３図は本発明の他の実施例に係る無線送受信
装置を示す。この第２実施例に係る折り返し試験回路
は、前記第１実施例に係るものにおいて、２つのミキサ
71、同ミキサ72に代えて１つのミキサ73を設け、この入
出力の各々にスイッチ82とスイッチ83とを接続し、ミキ
サ73の入出力を切り替えることによりミキサ73も共用
し、構成の一層の簡素化を図っている。動作は第１実施
例と同様であるので説明を省略する。Next, FIG. 3 shows a wireless transmitting / receiving apparatus according to another embodiment of the present invention. The folding test circuit according to the second embodiment is the same as the one according to the first embodiment, except that two mixers are used.
71, a single mixer 73 is provided in place of the mixer 72, a switch 82 and a switch 83 are connected to each of the input and output, and the mixer 73 is shared by switching the input and output of the mixer 73, so that the configuration is further improved. We are trying to simplify it. The operation is the same as in the first embodiment, and a description thereof will be omitted.
（発明の効果） 以上説明したように、本発明の無線送受信装置によれ
ば、送信中間周波数と受信中間周波数との差周波数を送
信周波数と受信周波数との差周波数に等しく設定してあ
るので、折り返し用の発振器を共用して高周波帯での折
り返し試験と、中間周波数帯での折り返し試験とが行え
る試験回路を構成でき、総合的試験のみならず障害箇所
の判別を容易に行うことができる効果がある。(Effect of the Invention) As described above, according to the wireless transmission / reception device of the present invention, the difference frequency between the transmission intermediate frequency and the reception intermediate frequency is set equal to the difference frequency between the transmission frequency and the reception frequency. A test circuit can be configured to perform a return test in the high frequency band and a return test in the intermediate frequency band by sharing the return oscillator. This makes it possible to easily determine not only the comprehensive test but also the fault location. There is.
また、折り返し用の発振器を共用しているので、装置
構成上発振器スペースを減らすことができ、装置の小型
化が図れる効果がある。In addition, since the return oscillator is shared, the oscillator space can be reduced in the device configuration, and the device can be downsized.
さらに、送受周波数を同期させる必要がある場合に
は、この折り返し用発振器も同期させる必要があるが、
この場合にも、発振器は１台で済んでいるので同期用の
回路も１台分でよく、構成が簡単になるという効果もあ
る。Furthermore, when it is necessary to synchronize the transmission and reception frequencies, it is necessary to synchronize the return oscillator,
Also in this case, since only one oscillator is required, only one synchronization circuit is required, and the configuration is simplified.
第１図は本発明の一実施例に係る無線送受信装置の構成
ブロック図、第２図は送受信周波数、送受の中間周波数
及びローカル周波数の関係図、第３図は本発明の他の実
施例に係る無線送受信装置の構成ブロック図、第４図は
従来の無線送受信装置の構成ブロック図である。 １……送信機、３……送信アンテナ、４……受信機、６
……受信アンテナ、70……発振器、71,72,73……ミキ
サ、80,81,82,83……スイッチ、101,401……高周波部、
102,402……中間周波部。FIG. 1 is a block diagram showing the configuration of a wireless transmission / reception apparatus according to one embodiment of the present invention, FIG. 2 is a diagram showing the relationship between transmission / reception frequencies, transmission / reception intermediate frequencies and local frequencies, and FIG. FIG. 4 is a block diagram showing the configuration of a conventional wireless transmitting / receiving apparatus. 1 ... transmitter, 3 ... transmitting antenna, 4 ... receiver, 6
…… Reception antenna, 70 …… Oscillator, 71,72,73 …… Mixer, 80,81,82,83 …… Switch, 101,401 …… High frequency part,
102,402 …… Intermediate frequency part.
Claims (2)
信機と；受信高周波部と受信中間周波部とを含む受信機
と；で構成される無線送受信装置において；送信中間周
波数と受信中間周波数との差周波数を送信周波数と受信
周波数との差周波数に等しく設定し；前記差周波数の信
号を発生する発振器と；前記送信高周波部から送信アン
テナへの出力信号の一部と前記発振器の出力信号とを混
合し受信周波数の信号を形成する第１のミキサと；前記
第１のミキサの出力信号と受信アンテナからの受信信号
とを切り換えて前記受信高周波部へ出力する第１のスイ
ッチと；前記送信中間周波部から前記送信高周波部への
出力信号の一部と前記発振器の出力信号とを混合し受信
中間周波数の信号を形成する第２のミキサと；前記第２
のミキサの出力信号と前記受信高周波部の出力信号との
いずれか一方を切り換えて前記受信中間周波部へ出力す
る第２のスイッチと；を備えたことを特徴とする無線送
受信装置。1. A radio transmitting / receiving apparatus comprising: a transmitter including a transmission intermediate frequency section and a transmission high frequency section; and a receiver including a reception high frequency section and a reception intermediate frequency section. An oscillator for setting a difference frequency from the frequency equal to a difference frequency between a transmission frequency and a reception frequency; an oscillator for generating a signal having the difference frequency; a part of an output signal from the transmission high-frequency unit to a transmission antenna and an output of the oscillator A first mixer that mixes a signal to form a signal of a reception frequency; a first switch that switches between an output signal of the first mixer and a reception signal from a reception antenna and outputs the signal to the reception high-frequency unit; A second mixer for mixing a part of an output signal from the transmission intermediate frequency section to the transmission high frequency section and an output signal of the oscillator to form a signal of a reception intermediate frequency;
And a second switch for switching one of the output signal of the mixer and the output signal of the reception high frequency section and outputting the signal to the reception intermediate frequency section.
信機と；受信高周波部と受信中間周波部とを含む受信機
と；で構成される無線送受信装置において；送信中間周
波数と受信中間周波数との差周波数を送信周波数と受信
周波数との差周波数に等しく設定し；前記差周波数の信
号を発生する発振器と；前記送信高周波部から送信アン
テナへの出力信号の一部と前記送信中間周波部から送信
高周波部への出力信号の一部とを切り換えて出力する第
１のスイッチと；前記第１のスイッチの出力信号と前記
発振器の出力信号とを混合し受信周波数の信号と受信中
間周波数の信号を形成出力するミキサと；前記ミキサの
出力信号を受けて受信周波数の信号と受信中間周波数の
信号とを切り換えて出力する第２のスイッチと；受信ア
ンテナからの受信信号と前記第２のスイッチの出力信号
たる受信周波数の信号とを切り換えて前記受信高周波部
へ出力する第３のスイッチと；前記受信高周波部の出力
信号と前記第２のスイッチの出力信号たる受信中間周波
数の信号とを切り換えて前記受信中間周波部へ出力する
第４のスイッチと；を備えたことを特徴とする無線送受
信装置。2. A radio transmission / reception apparatus comprising: a transmitter including a transmission intermediate frequency section and a transmission high frequency section; and a receiver including a reception high frequency section and a reception intermediate frequency section. An oscillator for generating a signal having the difference frequency; a part of an output signal from the transmission high-frequency unit to a transmission antenna; and the transmission intermediate frequency. A first switch for switching and outputting a part of the output signal from the unit to the transmission high-frequency unit; mixing the output signal of the first switch and the output signal of the oscillator to obtain a signal of a reception frequency and a reception intermediate frequency And a second switch for receiving a signal output from the mixer and switching and outputting a signal of a reception frequency and a signal of a reception intermediate frequency; reception from a reception antenna And a third switch for switching between a signal of a reception frequency as an output signal of the second switch and outputting the signal to the reception high-frequency section; reception of an output signal of the reception high-frequency section and an output signal of the second switch. A fourth switch for switching between signals of an intermediate frequency and outputting the signals to the reception intermediate frequency unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2189646A JP2847925B2 (en) | 1990-07-18 | 1990-07-18 | Wireless transceiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2189646A JP2847925B2 (en) | 1990-07-18 | 1990-07-18 | Wireless transceiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0478237A JPH0478237A (en) | 1992-03-12 |
| JP2847925B2 true JP2847925B2 (en) | 1999-01-20 |
Family
ID=16244797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2189646A Expired - Fee Related JP2847925B2 (en) | 1990-07-18 | 1990-07-18 | Wireless transceiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2847925B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2698745B1 (en) * | 1992-11-27 | 1995-01-20 | Telecommunications Sa | Tele-looping system for radio communications transceiver. |
| JP3248785B2 (en) * | 1992-12-14 | 2002-01-21 | 富士通株式会社 | Wireless transmission / reception device capable of loopback test |
-
1990
- 1990-07-18 JP JP2189646A patent/JP2847925B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0478237A (en) | 1992-03-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |