JPS62274840A - Portable radio receiver sensitivity measuring instrument - Google Patents
Portable radio receiver sensitivity measuring instrumentInfo
- Publication number
- JPS62274840A JPS62274840A JP61117784A JP11778486A JPS62274840A JP S62274840 A JPS62274840 A JP S62274840A JP 61117784 A JP61117784 A JP 61117784A JP 11778486 A JP11778486 A JP 11778486A JP S62274840 A JPS62274840 A JP S62274840A
- Authority
- JP
- Japan
- Prior art keywords
- sensitivity
- receiver
- radio receiver
- relative position
- antenna
- 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 claims abstract description 57
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
Description
【発明の詳細な説明】
発明の詳細な説明
〔産業上の利用分野〕
本発明は、無線受信機の感度測定器に関し、特に非希望
波に対して校正値を調整できる相対位置可動機構をもっ
た携帯無線受信機感度測定器に関する。[Detailed Description of the Invention] Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a sensitivity measuring device for a radio receiver, and in particular has a relative position movable mechanism that can adjust the calibration value for undesired waves. This invention relates to a portable radio receiver sensitivity measuring device.
従来、この種の携帯無線受信機感度測定器は、希望波に
対する感度調整機構しが持ってぃなかった。従来の携帯
無線受信機感度測定器による測定系を、第３図のブロッ
ク図に示す。図中、３１−はエンコーダ、３２はシグナ
ルジェネレータ、３３は携帯無線受信機感度測定器、５
は送信アンテナ、１は無線受信機を示す。Conventionally, this type of portable radio receiver sensitivity measuring device has not had a sensitivity adjustment mechanism for desired waves. A measurement system using a conventional portable radio receiver sensitivity measuring device is shown in the block diagram of FIG. In the figure, 31- is an encoder, 32 is a signal generator, 33 is a mobile radio receiver sensitivity measuring device, and 5
indicates a transmitting antenna, and 1 indicates a wireless receiver.
まず、エンコーダ３１がら符号化した信号が発生され、
この信号によりシグナルジェネレータ３２に変調ががけ
られ、携帯無線受信機感度測定器３３に送られる。そし
て送られた信号は、送信アンテナ５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。この時
、シグナルジェネレータ３２の出力レベルにより送信ア
ンテナ５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。First, an encoded signal is generated by the encoder 31,
This signal modulates the signal generator 32 and sends it to the mobile radio receiver sensitivity measuring device 33. The transmitted signal is then transmitted as a radio wave by the transmitting antenna 5, and the radio receiver 1 receives the radio wave. At this time, the electric field intensity transmitted from the transmitting antenna 5 changes depending on the output level of the signal generator 32, so the electric field intensity at the location where the radio receiver 1 is placed changes.
この無線受信機１が動作する最低の電界強度が感度であ
り、感度とシグナルジェネレータ３２の出力レベルとの
関係は次の様になる。ずなわち、無線受信機１が動作す
る最低のシグナルジェネレータ３２の出力レベル［ｄＢ
μＶ］から感度校正値［ｄＢ］を差引いたものが、感度
［ｄＢμＶ ／ ｍ］となる。The lowest electric field strength at which the radio receiver 1 operates is the sensitivity, and the relationship between the sensitivity and the output level of the signal generator 32 is as follows. That is, the lowest output level of the signal generator 32 at which the radio receiver 1 operates [dB
The sensitivity [dBμV/m] is obtained by subtracting the sensitivity calibration value [dB] from [μV].
この感度校正値は、送信アンテナ５と無線受信機１との
相対距離を調整する第１の相対位置可動機構により変化
させられる。アンテナ近傍での電界強度は、距離の２乗
に比例して減衰するので、送信アンテナ５と無線受信機
１とは、その相対距離を小さくすれば感度校正値が小さ
くなり、相対距離を大きくすれば感度校正値が大きくな
る。This sensitivity calibration value is changed by a first relative position movable mechanism that adjusts the relative distance between the transmitting antenna 5 and the radio receiver 1. The electric field strength near the antenna attenuates in proportion to the square of the distance, so if the relative distance between the transmitting antenna 5 and the wireless receiver 1 is reduced, the sensitivity calibration value will be reduced, and if the relative distance is increased, the sensitivity calibration value will be reduced. If this happens, the sensitivity calibration value will increase.
一般に、感度校正値は希望周波数に対して調整されてい
るので、非希望周波数の測定時には、感度は現実とは一
致しない。したがって、双方の周波数特性を満足させる
には、希望周波数のための感度校正値と、非希望周波数
のための感度校正値の２つの感度校正値が必要となって
いた。Generally, the sensitivity calibration value is adjusted to the desired frequency, so when measuring an undesired frequency, the sensitivity does not match reality. Therefore, in order to satisfy both frequency characteristics, two sensitivity calibration values are required: one for the desired frequency and one for the undesired frequency.
上述した従来の携帯無線受信機感度測定器は、携帯無線
受信機感度測定器の送信アンテナと、無線受信機の相対
距離を変えて、感度校正値を調整するため、相対位置可
動機構により感度構成値を調整するが、通常希望周波数
と、非希望周波数の感度校正値が異るため、２つの感度
校正値が必要であるという欠点がある。The conventional mobile radio receiver sensitivity measuring device described above adjusts the sensitivity calibration value by changing the relative distance between the transmitting antenna of the portable radio receiver sensitivity measuring device and the radio receiver, so the sensitivity can be configured using a relative position movable mechanism. However, since the sensitivity calibration values for the desired frequency and the undesired frequency are usually different, there is a drawback that two sensitivity calibration values are required.
本発明の目的は、このような欠点を除き、希望波の感度
校正値を変えずに非希望波の感度校正値を調整できるよ
うにした無線受信機感度測定器を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a radio receiver sensitivity measuring device that eliminates these drawbacks and allows adjustment of the sensitivity calibration value of undesired waves without changing the sensitivity calibration value of desired waves.
本発明の無線受信機感度測定器は、感度測定のための所
定レベルの高周波信号を送出する送信アンテナと、この
送信アンテナを支持固定するアンテナ支持手段と、被測
定物である無線受信機を支持固定する受信機支持手段と
、この受信機支持手段を前記送信アンテナと前記無線受
信機との相対距離を変えるように移動して受信感度校正
値を調整する第１の相対位置可動機構と、この第１の可
動機構の可動方向に直交する可動方向に前記送信アンテ
ナ支持手段を移動させる第２の相対位置可動機構とを備
えることを特徴とする。The radio receiver sensitivity measuring device of the present invention includes a transmitting antenna that transmits a high frequency signal of a predetermined level for sensitivity measurement, an antenna support means for supporting and fixing the transmitting antenna, and supporting a radio receiver as an object to be measured. a fixed receiver support means; a first relative position movable mechanism that moves the receiver support means to change the relative distance between the transmitting antenna and the radio receiver to adjust a reception sensitivity calibration value; A second relative position movable mechanism that moves the transmitting antenna support means in a movable direction perpendicular to a movable direction of the first movable mechanism.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例の斜視図である。図中、１は
被測定物である無線受信機で、送信アンテナ５から送信
した電波を受信機アンテナ１１により受信する。この無
線受信機１を支持する受信機固定板２は、第１の相対位
置可動機構３により、送信アンテナ５に対し前後に移動
でき、送信アンテナ５と受信機アンテナ１１との相対距
離を変えることができる。これにより希望波の感度校正
値を調整する。また、受信機固定板２は、受信機固定板
取付ネジ４により固定される。FIG. 1 is a perspective view of an embodiment of the present invention. In the figure, reference numeral 1 denotes a wireless receiver that is an object to be measured, and a receiver antenna 11 receives radio waves transmitted from a transmitting antenna 5 . The receiver fixing plate 2 supporting the wireless receiver 1 can be moved back and forth with respect to the transmitting antenna 5 by a first relative position movable mechanism 3, and the relative distance between the transmitting antenna 5 and the receiver antenna 11 can be changed. Can be done. This adjusts the sensitivity calibration value of the desired wave. Further, the receiver fixing plate 2 is fixed by receiver fixing plate mounting screws 4.
送信アンテナ５を支持する送信アンテナ固定板６は、第
１の相対位置可動機構３の可動方向に対し直交する方向
に可動する第２の相対位置可動機′Ｗｉ７により、送信
アンテナ５に対して左右に動き、送信アンテナ５と受信
機アンテナ１１との相対位置を変えることができる。こ
れにより非希望波の感度校正値を調整することができる
。また、送信アンテナ固定板６は、送信アンテナ固定板
取付ネジ８により固定される。信号は、外部信号入力コ
レクタ９より入力され、同軸コード１，０を通して送信
アンテナ５より送信される。The transmitting antenna fixing plate 6 supporting the transmitting antenna 5 can be moved left and right with respect to the transmitting antenna 5 by a second relative position movable mechanism 'Wi7 that is movable in a direction orthogonal to the movable direction of the first relative position movable mechanism 3. The transmitting antenna 5 and the receiving antenna 11 can change their relative positions. This makes it possible to adjust the sensitivity calibration value for undesired waves. Furthermore, the transmitting antenna fixing plate 6 is fixed by transmitting antenna fixing plate mounting screws 8. A signal is input from an external signal input collector 9 and transmitted from a transmitting antenna 5 through coaxial cords 1 and 0.
第２図の本実施例に用いる無線受信機の一例により、本
実施例の無線受信機用感度測定器の非希望波に対する感
度校正値の調整について説明する。Adjustment of the sensitivity calibration value for undesired waves of the radio receiver sensitivity measuring device of this embodiment will be explained using an example of the radio receiver used in this embodiment shown in FIG.
まず、受信機の動作を説明する。First, the operation of the receiver will be explained.
受信機アンテナ１１から信号が入力されると、ＲＦアン
プ２１により増幅され、フィルタ２２で回線周波数のみ
が選択されミキサ２４に送られる。この受信信号はロー
カル部２３が発振するローカル信号とミキサ２４で混合
される。さらにＩＦアンプ２５によって増幅され、周波
数弁別同路２６によって検波される。この検波信号が、
受信機の呼出番号と一致すると、デコーダ２７はバッフ
ァ２８を介してスピーカ２９を鳴音させる。When a signal is input from the receiver antenna 11, it is amplified by the RF amplifier 21, and only the line frequency is selected by the filter 22 and sent to the mixer 24. This received signal is mixed with a local signal oscillated by the local section 23 in a mixer 24. It is further amplified by the IF amplifier 25 and detected by the frequency discrimination circuit 26. This detection signal is
When the number matches the calling number of the receiver, the decoder 27 causes the speaker 29 to sound via the buffer 28.
しかし、非希望波に対しては、フィルタ２２により十分
信号が減衰してしまうため、受信機アンテナ１１を経由
してきたレベルは低い。従って、非希望波の場合は、フ
ィルタ２２以降のローカル部２３、キミサ２４のパター
ンや部品と結合して得られる信号レベルの方が受信機ア
ンテナ１１からの信号レベルよりも高い。このため、一
般的には希望波と非希望波に対する無線受信機の感度指
向性は異っている。However, since the signal of the undesired wave is sufficiently attenuated by the filter 22, the level of the signal that has passed through the receiver antenna 11 is low. Therefore, in the case of an undesired wave, the signal level obtained by combining with the patterns and parts of the local section 23 and the receiver 24 after the filter 22 is higher than the signal level from the receiver antenna 11. Therefore, in general, the sensitivity directivity of a radio receiver for desired waves and undesired waves is different.
また、通常携帯無線受信機において、希望波に対するア
ンテナの指向性は非常に鈍い。この性質を利用して第２
の相対位置可動機構７は、送信アンテナ５と、受信機ア
ンテナ］１との結合度をほとんど変えずに、送信アンテ
ナ５とフィルタ２２以降の回路との結合度を変える事が
できる。その結果、第２の相対位置可動機構７は希望波
に対する感度校正値を変えずに、非希望波に対する感度
校正値を調整できる。Furthermore, in a normal portable radio receiver, the antenna has very poor directivity with respect to the desired wave. Using this property, the second
The relative position movable mechanism 7 can change the degree of coupling between the transmitting antenna 5 and the circuits after the filter 22 while hardly changing the degree of coupling between the transmitting antenna 5 and the receiver antenna ]1. As a result, the second relative position movable mechanism 7 can adjust the sensitivity calibration value for undesired waves without changing the sensitivity calibration value for desired waves.
なお、第１図では、第１の相対位置可動機構３と第２の
相対位置可動機構７との可動方向を共に水平方向とした
が、以上の説明で明かなようにどちらか一方の相対位置
可動機構を垂直方向の可動としても良く、一般的に直交
した可動方向とずれば良い。In addition, in FIG. 1, the movable directions of the first relative position movable mechanism 3 and the second relative position movable mechanism 7 are both horizontal, but as is clear from the above explanation, the relative position of either one The movable mechanism may be movable in the vertical direction, as long as it deviates from the generally orthogonal movable direction.
以上説明したように、本発明は、希望波に対する感度校
正値を調整する第１の相対位置可動機構に対して可動方
向が直交する第２の相対位置可動ｔＲ横を設け、無線受
信機の希望波に対する感度指向性と非希望波に対する感
度指向性との違いにより、希望波の感度校正値を変えず
に、非希望波の感度校正値のみを調整できるという効果
がある。As explained above, the present invention provides a second relative position movable mechanism whose movable direction is orthogonal to the first relative position movable mechanism that adjusts the sensitivity calibration value for the desired wave, and The difference between the sensitivity directivity for waves and the sensitivity directivity for undesired waves has the effect that only the sensitivity calibration value for the unwanted waves can be adjusted without changing the sensitivity calibration value for the desired waves.
第１図は本発明の携帯無線受信機感度測定器の一実施例
の斜視図、第２図は第１図に用いられる無線受信機の一
例のブロック図、第３図は従来の携帯無線受信機用感度
測定器を用いた測定系ブロック図である。
］・・・無線受信機、２・・・受信機固定板、３・・・
感度調整機構、４．８・・・固定板取付ネジ、５・・・
送信アンテナ、６・・・送信アンテナ固定板、７・・・
スプリアス調整機構、９・・・外部信号コネクタ、１０
・・・同軸コード、１１・・・受信機アンテナ、２１・
・・ＲＦアンプ、２２・・・フィルタ、２３・・・ロー
カル部、２４・・・ミギサ、２５・・・ＩＰアンプ、２
６・・・周波数弁別回路、２７・・・デコーダ、２８・
・・バッファ、２つ・・・スピーカ、３１・・・エンコ
ーダ、３２・・・シグナルジェネレータ、３３・・・受
信機感度測定器。
＝９−Fig. 1 is a perspective view of an embodiment of the portable radio receiver sensitivity measuring device of the present invention, Fig. 2 is a block diagram of an example of the radio receiver used in Fig. 1, and Fig. 3 is a conventional portable radio receiver. FIG. 2 is a block diagram of a measurement system using a mechanical sensitivity measuring device. ]...Radio receiver, 2...Receiver fixing plate, 3...
Sensitivity adjustment mechanism, 4.8... Fixed plate mounting screw, 5...
Transmitting antenna, 6... Transmitting antenna fixing plate, 7...
Spurious adjustment mechanism, 9...external signal connector, 10
... Coaxial cord, 11 ... Receiver antenna, 21.
...RF amplifier, 22...filter, 23...local section, 24...migisa, 25...IP amplifier, 2
6... Frequency discrimination circuit, 27... Decoder, 28...
...Buffer, two...Speaker, 31...Encoder, 32...Signal generator, 33...Receiver sensitivity measuring device. =9-
Claims (1)
信アンテナと、この送信アンテナを支持固定するアンテ
ナ支持手段と、被測定物である無線受信機を支持固定す
る受信機支持手段と、この受信機支持手段を前記送信ア
ンテナと前記無線受信機との相対距離を変えるように移
動して受信感度校正値を調整する第１の相対位置可動機
構と、この第１の可動機構の可動方向に直交する可動方
向に前記送信アンテナ支持手段を移動させる第２の相対
位置可動機構とを備えることを特徴とする無線受信機感
度測定器。A transmitting antenna that transmits a high frequency signal of a predetermined level for sensitivity measurement, an antenna support means that supports and fixes the transmitter antenna, a receiver support means that supports and fixes a radio receiver as an object to be measured, and this receiver. a first relative position movable mechanism that adjusts a reception sensitivity calibration value by moving the support means to change the relative distance between the transmitting antenna and the radio receiver; and a first relative position movable mechanism that is orthogonal to the movable direction of the first movable mechanism A radio receiver sensitivity measuring device comprising: a second relative position movable mechanism that moves the transmitting antenna support means in a movable direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61117784A JPS62274840A (en) | 1986-05-21 | 1986-05-21 | Portable radio receiver sensitivity measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61117784A JPS62274840A (en) | 1986-05-21 | 1986-05-21 | Portable radio receiver sensitivity measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62274840A true JPS62274840A (en) | 1987-11-28 |
Family
ID=14720229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61117784A Pending JPS62274840A (en) | 1986-05-21 | 1986-05-21 | Portable radio receiver sensitivity measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62274840A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0298235A (en) * | 1988-10-04 | 1990-04-10 | Nec Corp | Portable radio receiver sensitivity measuring system |
| JPH03120145U (en) * | 1990-03-19 | 1991-12-10 | ||
| CN110632678A (en) * | 2019-09-23 | 2019-12-31 | 深圳市深创谷技术服务有限公司 | Full-electric wave darkroom testing device, sensing probe testing method and readable storage medium |
-
1986
- 1986-05-21 JP JP61117784A patent/JPS62274840A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0298235A (en) * | 1988-10-04 | 1990-04-10 | Nec Corp | Portable radio receiver sensitivity measuring system |
| JPH03120145U (en) * | 1990-03-19 | 1991-12-10 | ||
| CN110632678A (en) * | 2019-09-23 | 2019-12-31 | 深圳市深创谷技术服务有限公司 | Full-electric wave darkroom testing device, sensing probe testing method and readable storage medium |
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