JPH0298234A - Portable radio receiver sensitivity measuring system - Google Patents
Portable radio receiver sensitivity measuring systemInfo
- Publication number
- JPH0298234A JPH0298234A JP63251320A JP25132088A JPH0298234A JP H0298234 A JPH0298234 A JP H0298234A JP 63251320 A JP63251320 A JP 63251320A JP 25132088 A JP25132088 A JP 25132088A JP H0298234 A JPH0298234 A JP H0298234A
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic shielding
- shielding box
- signal
- radio receiver
- box
- 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.)
- Pending
Links
- 230000035945 sensitivity Effects 0.000 title abstract description 15
- 238000005259 measurement Methods 0.000 abstract description 14
- 230000005684 electric field Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000691 measurement method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 241000282412 Homo Species 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、携帯無線受信機感度測定方式、特に、測定に
際し、ノイズを遮断する携帯無線受信機感度測定方式に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring the sensitivity of a portable radio receiver, and particularly to a method for measuring the sensitivity of a portable radio receiver that blocks noise during measurement.
従来、この種の携帯無線受信機感度測定方式は、測定系
外からの電磁波を遮断する機能しか持っていなかった。Conventionally, this type of mobile radio receiver sensitivity measurement method only had the function of blocking electromagnetic waves from outside the measurement system.
従来の携帯無線受信機感度測定方式による測定系を第３
図のブロック図に示す０図中、１３は電磁遮蔽室、１０
はエンコーダ、１１はシグナルジェネレータ、３は送信
アンテナ、１は無線受信機、１２は人間を示す。The third measurement system using the conventional mobile radio receiver sensitivity measurement method
In the block diagram shown in Figure 0, 13 is an electromagnetic shielding room, 10
is an encoder, 11 is a signal generator, 3 is a transmitting antenna, 1 is a wireless receiver, and 12 is a human being.
まず、エンコーダ１０から符号化された信号が発生され
、この信号によりシグナルジェネレータ１１に変調がか
けられ、送信アンテナに送られる。First, an encoded signal is generated from the encoder 10, modulated by the signal generator 11, and sent to the transmitting antenna.
そして送られた信号は、送信アンテナ３によって電波と
して送信され、無線受信機１がその電波を受信する。こ
のとき、シグナルジェネレータ１１の出力レベルにより
送信アンテナ３から送信される電界強度が変化するため
、無線受信機１の置かれた場所の電界強度が変化する。The transmitted signal is then transmitted as a radio wave by the transmitting antenna 3, and the radio receiver 1 receives the radio wave. At this time, since the electric field intensity transmitted from the transmitting antenna 3 changes depending on the output level of the signal generator 11, the electric field intensity at the location where the wireless receiver 1 is placed changes.
この無線受信機１が受信応答する最低の電界強度が感度
である。The lowest electric field strength that the radio receiver 1 responds to is the sensitivity.
無線受信機１の感度を測定するには人間１２がシグナル
ジェネレータ１１の出力レベルを調整し、無線受信機１
が受信応答で発する応答音の有無により受信したかどう
かを判定し、応答音が有ればシグナルジェネレータ１１
の出力レベルを下げるよう調節し、応答音が無ければシ
グナルジェネレータ１１の出力レベルを上げるよう調節
して、測定を行っていた。To measure the sensitivity of the wireless receiver 1, the human 12 adjusts the output level of the signal generator 11 and measures the sensitivity of the wireless receiver 1.
The signal generator 11 determines whether reception has been received based on the presence or absence of a response sound emitted in response to reception, and if there is a response sound, the signal generator 11
The output level of the signal generator 11 was adjusted to be lowered, and if there was no response sound, the output level of the signal generator 11 was adjusted to be increased.
エンコーダ１０、シグナルジェネレータ１１、送信アン
テナ３、無線受信機１及び人間１２は、電磁遮蔽室１３
の中に設置され、電磁遮蔽室の外部で発生される電磁波
を遮断し、測定が行われていた。The encoder 10, the signal generator 11, the transmitting antenna 3, the radio receiver 1 and the person 12 are placed in an electromagnetic shielding room 13.
It was installed inside the electromagnetic shielding room to block electromagnetic waves generated outside the room and take measurements.
上述した従来の携帯無線受信機感度測定方式は、電磁遮
蔽室の中にエンコーダやシグナルジェネレータを設置し
ているので、測定器が発生するノイズが被測定物である
無線受信機に与えられ、精度の良い測定が行えないとい
う欠点があった。In the conventional mobile radio receiver sensitivity measurement method described above, the encoder and signal generator are installed in an electromagnetic shielding room, so the noise generated by the measuring device is applied to the radio receiver, which is the object to be measured, and the accuracy is reduced. The drawback was that it was not possible to make good measurements.
また、電磁遮蔽室内に人間がいるので電界の分布が変化
し、再現性の良い測定が行えないという欠点があった。Furthermore, since there are people in the electromagnetic shielding room, the distribution of the electric field changes, making it impossible to perform measurements with good reproducibility.
さらに、エンコーダ、シグナルジェネレータ、人間が入
れるだけの大きさを持つ電磁遮蔽室が必要であり、高価
であるという欠点があった。Furthermore, it requires an electromagnetic shielding chamber large enough for an encoder, a signal generator, and a human being, and is expensive.
本発明による携帯無線受信機感度測定方式は、開閉可能
な電磁遮蔽箱と、該電磁遮蔽箱の外に設置され符号化さ
れた信号を発生するエンコーダと、前記電磁遮蔽箱の外
に設置され前記エンコーダの発生する符号化された信号
により変調された高周波信号を発生するシグナルジェネ
レータと、前記電磁遮蔽箱内に設置された所定のレベル
の高周波信号を送出する送信アンテナと、前記送信アン
テナを前記電磁遮蔽箱に支持固定する絶縁性のアンテナ
支持手段と、前記電磁遮蔽箱側面にケースと導電性を持
って取り付けた同軸型の外部信号コネクタと、前記外部
信号コネクタと前記送信アンテナを結び前記外部信号コ
ネクタに供給される高周波信号を前記送信アンテナに伝
達する同軸ケーブルと、前記電磁遮蔽箱の一側面を貫通
する導電性管と、前記導電性管内に設置され前記電磁遮
蔽箱内部に向けて指向性を持つマイクと、前記マイクが
検出した信号を表示するために前記電磁遮蔽箱の外に設
置された表示手段とを含んで構成される。The portable wireless receiver sensitivity measurement method according to the present invention includes: an electromagnetic shielding box that can be opened and closed; an encoder that is installed outside the electromagnetic shielding box and generates a coded signal; a signal generator that generates a high frequency signal modulated by a coded signal generated by the encoder; a transmitting antenna installed in the electromagnetic shielding box that transmits a high frequency signal of a predetermined level; an insulating antenna support means supported and fixed on the shielding box; a coaxial external signal connector attached to the side of the electromagnetic shielding box so as to be conductive with the case; and connecting the external signal connector and the transmitting antenna to receive the external signal. a coaxial cable that transmits a high frequency signal supplied to the connector to the transmitting antenna; a conductive tube that passes through one side of the electromagnetic shielding box; and display means installed outside the electromagnetic shielding box to display the signal detected by the microphone.
次に、本発明の実施例について、図面を参照して詳細に
説明する。Next, embodiments of the present invention will be described in detail with reference to the drawings.
第１図は、本発明の一実施例を示す図である。FIG. 1 is a diagram showing an embodiment of the present invention.
開閉可能な電磁遮蔽箱２の外に、エンコーダ１０とシグ
ナルジェネレータ１１が設置されている。An encoder 10 and a signal generator 11 are installed outside the electromagnetic shielding box 2, which can be opened and closed.
被測定物である無線受信機１が電磁遮蔽箱２の中に置か
れている、送信アンテナ３が絶縁性のアンテナ支持手段
４により電磁遮蔽箱２内に固定されている。電磁遮蔽箱
２の側面に同軸型の外部信号コネクタ５がケースと導電
性を持って取り付けられている。外部コネクタ５は同軸
ケーブル６により送信アンテナ３と接続されている。電
磁遮蔽箱２の一側面を貫通する導電性管７の中に電磁遮
蔽箱の内部に向けて指向性を持つマイク８が設置されて
いる。マイク８より送られる電気信号を表示に変換する
表示手段９が電磁遮蔽箱２の外に設置されている。A radio receiver 1, which is an object to be measured, is placed in an electromagnetic shielding box 2, and a transmitting antenna 3 is fixed in the electromagnetic shielding box 2 by an insulating antenna support means 4. A coaxial type external signal connector 5 is attached to the side surface of the electromagnetic shielding box 2 so as to be conductive to the case. External connector 5 is connected to transmitting antenna 3 via coaxial cable 6. A microphone 8 having directivity toward the inside of the electromagnetic shielding box 2 is installed in a conductive tube 7 that penetrates one side of the electromagnetic shielding box 2. A display means 9 for converting an electric signal sent from the microphone 8 into a display is installed outside the electromagnetic shielding box 2.
電磁遮蔽箱２の外に設置されたエンコーダ１０から符号
化された信号が発生され、この信号によりシグナルジェ
ネレータ１１に変調がかけられ、外部コネクタ５に供給
される。外部コネクタ５に供給される高周波信号は、同
軸ケーブル６により送信アンテナ３へ送られる。そして
送れらな信号は、送信アンテナ３により電波として送信
され、無線受信機１がその電波を受信する。無線受信機
１は、感度となる電界強度以上のレベルの電波を受信す
れば、受信応答として応答音を発生する。An encoder 10 installed outside the electromagnetic shielding box 2 generates an encoded signal, which modulates the signal generator 11 and supplies it to the external connector 5. The high frequency signal supplied to the external connector 5 is sent to the transmitting antenna 3 via a coaxial cable 6. The signals that cannot be sent are transmitted as radio waves by the transmitting antenna 3, and the radio receiver 1 receives the radio waves. When the radio receiver 1 receives a radio wave having a level equal to or higher than the electric field strength for which the radio receiver 1 is sensitive, it generates a response sound as a reception response.
応答音は電磁遮蔽ＷＩ２の一側面を貫通する導電性管７
の中に設置され電磁遮蔽箱２の内部に向けて指向性を持
つマイク８に到達し、電気信号に変換される。その電気
信号は電磁遮蔽箱２の外に設置された表示手段９に伝達
される０人間１２は、表示手段９の表示の有無により、
シグナルジェネレータ１１の出力レベルを調節し、無線
受信機１の感度測定を行う。The response sound is a conductive pipe 7 that penetrates one side of the electromagnetic shield WI2.
The signal reaches the microphone 8 which is installed inside the electromagnetic shielding box 2 and has directivity toward the inside of the electromagnetic shielding box 2, and is converted into an electrical signal. The electrical signal is transmitted to the display means 9 installed outside the electromagnetic shielding box 2.
The output level of the signal generator 11 is adjusted and the sensitivity of the wireless receiver 1 is measured.
ところで、測定系内のエンコーダ１０、シグナルジェネ
レータ１１が発生するノイズや外来のノイズは、電磁遮
蔽箱２により遮断され、被測定物である無線受信機１に
は何ら影響を与えない、また、マイク８に電気信号が流
れる際に発生するノイズも導電性管７によって減衰され
るため、被測定物である無線受信機１には何ら影響を与
えない。By the way, the noise generated by the encoder 10 and signal generator 11 in the measurement system and external noise are blocked by the electromagnetic shielding box 2 and have no effect on the wireless receiver 1, which is the object to be measured. Since the noise generated when an electric signal flows through the conductive tube 7 is also attenuated by the conductive tube 7, it does not have any effect on the wireless receiver 1, which is the object to be measured.
ここで、導電性管の効果について述べておく。Here, we will discuss the effects of conductive tubes.
第２図は導電性管の形状を説明するための図である０図
中、ｔは管の長さ、ｄは管の直径を示す。FIG. 2 is a diagram for explaining the shape of a conductive tube. In FIG. 2, t indicates the length of the tube, and d indicates the diameter of the tube.
「解析ノイズ・メカニズム」 （間材 辿夫著 ＣＱ出
版社）によれば、この場合、
ｆｃ （Ｈｚ）＝ １− ’ −・・■を
遮断周波数とし、
１ ・・・■
５（ｄＢ）−３１ｘ丁
を特徴とする特性を持ち、ｆｃより低い周波数での減衰
器となる。したがって、ＩＧＨｚを遮断周波数とした時
、■式よりｄ＝２．７Ｃ１１，１００ｄＢの減衰率を得
るためには、ｔ＝８．４Ｃ１１となる。According to "Analytical Noise Mechanism" (written by Takao Mazashi, published by CQ Publishing), in this case, fc (Hz) = 1-' -...■ is the cutoff frequency, and 1...■ 5 (dB)- It has characteristics characterized by 31x, and is an attenuator at frequencies lower than fc. Therefore, when IGHz is set as the cutoff frequency, d=2.7C11, and in order to obtain an attenuation rate of 100 dB from equation (2), t=8.4C11.
本発明の携帯無線受信機感度測定方式では、導電性管の
中に設置したマイクにより電磁遮蔽箱内の応答音を検出
し、電磁遮蔽箱外で人間が表示により無線受信機の応答
の有無を確認するので、電磁遮蔽箱内の電界分布を人間
が乱す事なく測定でき、再現性のよい測定が行えるとい
う効果がある。In the portable wireless receiver sensitivity measurement method of the present invention, a microphone installed in a conductive tube detects the response sound inside the electromagnetic shielding box, and a person outside the electromagnetic shielding box uses a display to determine whether or not there is a response from the wireless receiver. This has the advantage that the electric field distribution inside the electromagnetic shielding box can be measured without disturbance by humans, and measurements can be performed with good reproducibility.
また、エンコーダ、シグナルジェネレータが電磁遮蔽箱
外に設置されるので、外来のノイズだけでなく、測定系
自身の発生するノイズも遮断し、精度の良い感度測定が
行えるという効果がある。さらに、電磁遮蔽箱は、送信
アンテナと、無線受信機及び導電性管が入るだけの大き
さが有れば良いので、非常に小さく、また、安価である
という効果がある。Furthermore, since the encoder and signal generator are installed outside the electromagnetic shielding box, not only external noise but also noise generated by the measurement system itself is blocked, making it possible to perform highly accurate sensitivity measurements. Furthermore, since the electromagnetic shielding box only needs to be large enough to accommodate the transmitting antenna, radio receiver, and conductive tube, it has the advantage of being extremely small and inexpensive.
磁遮蔽室。Magnetically shielded room.
Claims (1)
れ符号化された信号を発生するエンコーダと、前記電磁
遮蔽箱の外に設置され前記エンコーダの発生する符号化
された信号により変調された高周波信号を発生するシグ
ナルジェネレータと、前記電磁遮蔽箱内に設置された所
定のレベルの高周波信号を送出する送信アンテナと、前
記送信アンテナを前記電磁遮蔽箱に支持固定する絶縁性
のアンテナ支持手段と、前記電磁遮蔽箱側面にケースと
導電性を持って取り付けた同軸型の外部信号コネクタと
、前記外部信号コネクタと前記送信アンテナを結び前記
外部信号コネクタに供給される高周波信号を前記送信ア
ンテナに伝達する同軸ケーブルと、前記電磁遮蔽箱の一
側面を貫通する導電性管と、前記導電性管内に設置され
前記電磁遮蔽箱内部に向けて指向性を持つマイクと、前
記マイクが検出した信号を表示するために前記電磁遮箱
の外に設置された表示手段とを含むことを特徴とする携
帯無線受信機感度測定方式。an electromagnetic shielding box that can be opened and closed; an encoder installed outside the electromagnetic shielding box that generates a coded signal; and an encoder installed outside the electromagnetic shielding box that is modulated by the encoded signal generated by the encoder. a signal generator that generates a high frequency signal of a predetermined level; a transmitting antenna installed in the electromagnetic shielding box that transmits a high frequency signal of a predetermined level; and an insulating antenna support means that supports and fixes the transmitting antenna to the electromagnetic shielding box. and a coaxial external signal connector conductively attached to the side of the electromagnetic shielding box with the case, and connecting the external signal connector and the transmitting antenna to transmit the high frequency signal supplied to the external signal connector to the transmitting antenna. A coaxial cable for transmitting a signal, a conductive tube passing through one side of the electromagnetic shielding box, a microphone installed in the conductive tube and having directivity toward the inside of the electromagnetic shielding box, and a signal detected by the microphone. and a display means installed outside the electromagnetic shielding box for displaying the information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63251320A JPH0298234A (en) | 1988-10-04 | 1988-10-04 | Portable radio receiver sensitivity measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63251320A JPH0298234A (en) | 1988-10-04 | 1988-10-04 | Portable radio receiver sensitivity measuring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0298234A true JPH0298234A (en) | 1990-04-10 |
Family
ID=17221062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63251320A Pending JPH0298234A (en) | 1988-10-04 | 1988-10-04 | Portable radio receiver sensitivity measuring system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0298234A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462810A (en) * | 2018-12-19 | 2019-03-12 | 珠海市精实测控技术有限公司 | A kind of Mobile phone horn aging testing system |
-
1988
- 1988-10-04 JP JP63251320A patent/JPH0298234A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462810A (en) * | 2018-12-19 | 2019-03-12 | 珠海市精实测控技术有限公司 | A kind of Mobile phone horn aging testing system |
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