JPH11112959A - Incoming band measurement rod for catv transmission network - Google Patents
Incoming band measurement rod for catv transmission networkInfo
- Publication number
- JPH11112959A JPH11112959A JP10070215A JP7021598A JPH11112959A JP H11112959 A JPH11112959 A JP H11112959A JP 10070215 A JP10070215 A JP 10070215A JP 7021598 A JP7021598 A JP 7021598A JP H11112959 A JPH11112959 A JP H11112959A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- power supply
- measuring
- measuring rod
- band
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、CATV電送網の
上向帯城測定棒に関するものであって、具体的には両方
向CATV(Cable Television)サー
ビスを提供するとき、加入者側からCATV放送局へ伝
達される上向信号に含まれた雑音の有無を検出する中で
も、CATV放送局から加入者へ伝達される下向信号が
中断されないようにしながら試験に所要される時間を短
縮させることができるCATV電送網の上向帯域測定棒
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring cable for an upward band in a CATV transmission network, and more specifically, to provide a CATV (Cable Television) service from a subscriber to a CATV broadcasting station. Even when detecting the presence or absence of noise included in the upward signal transmitted to the subscriber, the time required for the test can be reduced while the downward signal transmitted from the CATV broadcast station to the subscriber is not interrupted. The present invention relates to an upward band measuring rod of a CATV transmission network.
【0002】[0002]
【従来の技術】一般的に、CATVのサービスは、CA
TV放送局から各々の加入者側へ放送信号を伝達する下
向信号の伝達と、加入者側からCATV放送局へ上向信
号を伝達する両方向への通信が可能であることはよく知
られている事実である。また、上記のCATV放送局か
ら加入者側へ伝達される下向信号は、54MHz程度の帯
域を有するRF信号に変造されて出力され、各々の加入
者側からCATV放送局へ伝達される上向信号は、5乃
至30MHz帯域のRF信号に変造して出力する方法が
主に使用されている。2. Description of the Related Art Generally, CATV services are provided by CAs.
It is well known that communication in both directions, that is, transmission of a downward signal for transmitting a broadcast signal from a TV broadcast station to each subscriber side and transmission of an upward signal from a subscriber side to a CATV broadcast station is possible. Is a fact. The downward signal transmitted from the CATV broadcast station to the subscriber side is converted into an RF signal having a band of about 54 MHz, output, and transmitted from each subscriber side to the CATV broadcast station. A method of converting a signal into an RF signal in a band of 5 to 30 MHz and outputting the converted signal is mainly used.
【0003】しかし、加入者側からCATV放送局へ上
向信号が伝達される周波数帯域である5乃至30MHz
の帯域は外部電波に最も脆弱する帯域であるため、雑音
を完璧に防止しなければならないという問題点がある。
従来には図1に示したようなCATV用電送システムを
通して両方向サービスを提供しながら放送局1と多数の
加入者等9の間に両方向で信号を電送するが、放送局1
と加入者9等の間に上向または下向信号の減殺を補償す
る為の多数の増幅器2、3、4等と、上記放送局1から
の放送信号を分配してツリー(tree)形式で加入者
9等へ伝達する為の多数の分配器(splitter)
5、6、7等と、上記の加入者9等が密集している地域
に設置されて同一分配ライン上で各々の加入者9へ信号
を分岐して供給する多数の分岐器8等により構成した。[0005] However, a frequency band of 5 to 30 MHz, which is a frequency band in which an upward signal is transmitted from a subscriber side to a CATV broadcasting station, is used.
Is the band most vulnerable to external radio waves, so there is a problem that noise must be completely prevented.
Conventionally, signals are transmitted in both directions between the broadcasting station 1 and a large number of subscribers 9 while providing a two-way service through a CATV transmission system as shown in FIG.
And a plurality of amplifiers 2, 3, 4, etc. for compensating for the attenuation of the upward or downward signal between the broadcast station 1 and the subscriber 9, etc., and the broadcast signal from the broadcast station 1 is distributed in a tree format. Numerous splitters for transmitting to subscribers 9 etc.
5, 6, 7, etc., and a number of branching devices 8 installed in an area where the above-mentioned subscribers 9 are densely provided and branching and supplying signals to each subscriber 9 on the same distribution line. did.
【0004】ここで、上記増幅器2、3、4等は放送信
号が放送に影響を及ぼす程度に減殺されることを防止す
るために電送ライン上の最大600m以内の距離毎に設
置する必要があり、良好な品質の放送サービスを提供す
る為には200m毎に設置しており、分配器5、6、7
等はすべての加入者等が均一な品質の放送信号を送受信
するように電送距離により減殺の程度を異にする減殺機
能を有する両方向結合器(directiona1 c
oupler)を主に使用している。Here, the amplifiers 2, 3, 4 and the like need to be installed at a distance of up to 600 m on the transmission line in order to prevent the broadcast signal from being reduced to such an extent that the broadcast is affected. In order to provide good quality broadcasting service, the service is installed every 200m and the distributors 5, 6, 7
Are bidirectional couplers having a attenuation function that varies the degree of attenuation depending on the transmission distance so that all subscribers transmit and receive broadcast signals of uniform quality.
coupler) is mainly used.
【0005】[0005]
【発明が解決しようとする課題】しかし、上記のような
従来のCATV用電送システムによっては上向信号に含
まれた雑音を測定するとき分岐線路及び分配器から流入
される雑音を測定する為には、ある組が増幅器に測定器
を連結して雑音の状態を分析するようにする状態で、他
の組が後段の手動素子(他の分配器または分岐器)を一
つずつ分離しながら測定しなければならなかったため点
検区間に放送局から伝達される下向の信号も中断され、
上向サービスのときネガティブ素子の上向測定が不可能
になり、雑音の測定のために常に2つの組が必要になっ
て維持補修の人員及び装備費用が上昇することは勿論、
測定に多くの時間が所要される等の短所があった。However, in the conventional CATV transmission system as described above, when measuring the noise included in the upward signal, it is necessary to measure the noise flowing from the branch line and the distributor. Is a state in which one set connects a measuring instrument to an amplifier to analyze the state of noise, and the other set measures while separating the subsequent manual elements (other splitters or splitters) one by one. Down signal transmitted from the broadcasting station during the inspection section was also interrupted,
In the case of the upward service, the upward measurement of the negative element becomes impossible, and two sets are always required for the measurement of the noise, so that the maintenance staff and equipment costs are increased.
There are disadvantages such as that much time is required for measurement.
【0006】すなわち、分岐器の分岐線路試験の場合に
は分岐器のモジュールを除去したあと、動軸線路故障点
探知器で線路を点検すると同時に前段増幅器で上向信号
を測定する過程により遂行されるため、2台の高所作業
車輛と多くの作業時間が所要され、分配器の引入線路試
験の場合には一番目の分配器から順次末端分配器まで分
配器モジュールを除去しながら上向信号に雑音が流入さ
れる支点を測定する過程により遂行されるため、やはり
2台の高所作業車輛と多くの作業時間が所要され、測定
のとき下向信号である放送信号も中断される問題点があ
った。That is, in the case of a branch line test of a branching device, after removing the module of the branching device, it is performed by a process of checking a line with a fault detecting device for a moving shaft line and measuring an upward signal with a pre-amplifier. Therefore, two aerial work vehicles and a lot of working time are required, and in the case of the incoming line test of the distributor, the upward signal while removing the distributor module from the first distributor to the terminal distributor sequentially. This is performed by measuring a fulcrum into which noise is introduced, so that two work vehicles at high altitude and a lot of work time are required, and a broadcast signal which is a downward signal is also interrupted at the time of measurement. was there.
【0007】これにより、本発明は加入者側からCAT
V放送局へ伝達される上向信号に含まれた雑音の有無を
検出するとき測定対象分岐器や分配器に測定棒を挿入す
る簡単な動作により、CATV放送局から加入者へ伝達
される下向信号を中断させないと同時に少ない人力によ
っても試験時間を短縮させることができるCATV電送
網の上向帯域測定棒を提供することをその目的とする。As a result, the present invention provides a CAT
When detecting the presence or absence of noise included in the upward signal transmitted to the V broadcast station, a simple operation of inserting a measuring rod into the branching unit or distributor to be measured allows a lower transmission from the CATV broadcast station to the subscriber. SUMMARY OF THE INVENTION It is an object of the present invention to provide an upper band measuring rod for a CATV transmission network, which can reduce a test time with a small amount of manpower without interrupting a heading signal.
【0008】[0008]
【課題を解決するための手段】かかる目的を達成する為
の本発明のCATV電送網の上向帯域測定棒は、一側の
両方向結合器と連結する為の結合ボルト部には接続片を
突出成形すると同時に、他側には測定器と連結する為の
ボルト部を一体で形成し、上記結合ボルト部が形成され
た一側の内部には電源分離部を構成して信号成分に含ま
れた電源成分を除去するようにし、上記の電源分離部に
は低域通過フィルタを連結して電源成分が除去された信
号で低域の信号のみを検出して加入者側からCATV放
送局へ伝達される上向信号に含まれた雑音を検出するこ
とにより、CATV放送局から加入者へ伝達される下向
信号が中断されないと同時に少ない人力によっても試験
時間を短縮させられる。In order to achieve the above object, an upward band measuring rod of the CATV transmission network according to the present invention has a connecting piece projecting from a connecting bolt portion for connecting to a one-way bidirectional coupler. At the same time as molding, the other side is integrally formed with a bolt part for connecting to the measuring instrument, and the inside of one side where the coupling bolt part is formed constitutes a power supply separation part and is included in the signal component. The power supply component is removed, and a low-pass filter is connected to the power supply separation unit to detect only the low-frequency signal from the signal from which the power supply component has been removed and transmit the signal to the CATV broadcasting station from the subscriber side. By detecting the noise included in the upward signal, the downward signal transmitted from the CATV broadcasting station to the subscriber is not interrupted, and the test time can be reduced with less human labor.
【0009】[0009]
【発明の実施の形態】以下、本発明を添付図面により詳
しく記述すれば次の通りである。図2は、本発明の一実
施例による測定棒の構成を示したものであって、測定棒
本体11の両側には結合ボルト部12とボルト部13を
突出形成し、これを通して電源成分が含まれた信号が伝
達されるようにし、測定する部位の両方向結合器(図1
の分配器及び分岐器)と連結する為の結合ボルト部12
には接続片14を突出するように形成すると同時に、他
側のボルト部13には雑音(Noise)の有無を測定
する為の測定器を連結するようにし、上記結合ボルト部
12が形成された本体11の内部には電源分離部15を
構成して信号に含まれた電源成分を除去するようにし、
上記の電源分離部15には低域通過フィルタ16を連結
して電源成分が除去された信号中低域の信号5乃至30
MHz帯域のRF信号である上向信号を検出することに
より上記のボルト部13に連結される測定器を通して上
向信号に含まれた雑音の有無を検出するのである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 shows a configuration of a measuring rod according to an embodiment of the present invention, in which a connecting bolt portion 12 and a bolt portion 13 are formed on both sides of a measuring rod main body 11 so as to include a power component. The transmitted signal is transmitted, and the two-way coupler (Fig. 1)
Bolts 12 for connecting to the distributor and the branching device)
At the same time, the connecting piece 14 is formed so as to protrude, and at the same time, a measuring device for measuring the presence or absence of noise (Noise) is connected to the other bolt part 13, so that the coupling bolt part 12 is formed. A power supply separation unit 15 is configured inside the main body 11 to remove a power supply component included in a signal,
A low-pass filter 16 is connected to the power supply separation unit 15 to remove the power supply component.
By detecting an upward signal, which is an RF signal in the MHz band, the presence or absence of noise included in the upward signal is detected through a measuring device connected to the bolt unit 13.
【0010】図3は本発明の一実施例による測定棒の詳
細な構成を示したものであって、測定棒本体11の結合
ボルト部12側の接続片14に二つのコンデンサC1、
C2及びインダクタンスL1によりなる電源分離部15
を連結して接続片14を通して流入される信号に含まれ
た電源成分をバイパスさせるようにし、上記の電源分離
部15で電源成分が除去された信号はインダクタンスL
2、L3、L4、L5等の直列接続と上記インダクタン
スL2、L3、L4、L5の前後段でコンデンサC3、
C7またはインダクタンスL6、L7、L8とコンデン
サC4、C5、C6の直列接続を通して接地されるよう
した低域通過フィルタ16を経由するようにして、5乃
至30MHz帯域のRF信号である上向信号のみをボル
ト部13に連結する測定器に伝達して雑音(Nois
e)の有無を正確に検出するようにする。FIG. 3 shows a detailed configuration of a measuring rod according to an embodiment of the present invention. Two capacitors C1 and C2 are connected to a connecting piece 14 of a measuring rod main body 11 on a side of a coupling bolt portion 12.
Power supply separation unit 15 composed of C2 and inductance L1
To bypass the power supply component included in the signal flowing through the connection piece 14, and the signal from which the power supply component has been removed by the power supply separation unit 15 has an inductance L.
2, L3, L4, L5, etc. in series and the inductances L2, L3, L4, L5 before and after the capacitor C3,
By passing through a low-pass filter 16 grounded through a series connection of C7 or inductances L6, L7, L8 and capacitors C4, C5, C6, only the upward signal, which is an RF signal in the 5 to 30 MHz band, is passed. The noise is transmitted to the measuring instrument connected to the bolt section 13 (Nois
e) Presence or absence of presence is accurately detected.
【0011】さらに、上記の測定棒本体11は図1に示
すことと同一に放送局1から多数の増幅器2、3、4等
を通して伝達される放送信号は、多数の分配器5、6、
7等によって分配され、同一分配ライン上で多数の分配
器8等を通して各々の加入者9に分岐して供給されるよ
うにしたため、放送局1から各々の加入者9等へ電送さ
れる下向信号である放送信号には雑音がほとんど発生さ
れないが、各々の加入者9等から放送局1へ上向伝達さ
れる信号には雑音が多く含まれる。Further, the measuring rod main body 11 transmits a broadcast signal transmitted from the broadcasting station 1 through a number of amplifiers 2, 3, 4, etc., as shown in FIG.
7 is distributed to each subscriber 9 through a number of distributors 8 on the same distribution line, so that the broadcast station 1 transmits downward to each subscriber 9 and the like. Although little noise is generated in the broadcast signal, which is a signal, the signal transmitted upward from each subscriber 9 or the like to the broadcast station 1 contains a lot of noise.
【0012】故に、図4に示した通り、測定棒本体11
の一側に形成された結合ボルト部12を上記両方向結合
器である図1の分配器5、6、7の出力側21の密閉型
キャップ22を分離させたあとのナット部23にネジ止
めにより締結して結合すると、この入力側24を通して
伝達され多数の出力側21を通して複数加入者9等に電
送され各々の加入者9等から放送局1へ電送されて内部
の分配回路を通して流れる信号を接続片14を通して検
出することができる。Therefore, as shown in FIG.
The connecting bolt portion 12 formed on one side is screwed to the nut portion 23 after the closed cap 22 on the output side 21 of the distributors 5, 6, 7 of FIG. When fastened and coupled, the signals transmitted through the input side 24 and transmitted to the plurality of subscribers 9 through the multiple output sides 21 and transmitted from each subscriber 9 and the like to the broadcasting station 1 and flowing through the internal distribution circuit are connected. It can be detected through the piece 14.
【0013】上記の測定棒本体11に伝達される信号に
対して内部の電源分離部15で電源成分を除去した後、
低域通過フィルタ16で5乃至30MHz帯城のRF信
号である低域成分のみを検出すれば加入者9から放送局
1へ電送される上向信号を測定棒本体11のボルト部1
3に連結された測定器に伝達されるため、雑音が含まれ
ているか否かを確認することができる。After removing the power component from the signal transmitted to the measuring rod main body 11 by the internal power source separation unit 15,
If the low-pass filter 16 detects only the low-frequency component of the RF signal of the 5 to 30 MHz band, the upward signal transmitted from the subscriber 9 to the broadcasting station 1 is output to the bolt 1 of the measuring rod body 11.
Since it is transmitted to the measuring device connected to 3, it can be confirmed whether or not noise is included.
【0014】また測定棒本体11を両方向結合器である
図1の分岐器8の出力側中の一つにネジ止めにより締結
して結合すると、この入力側を通して伝達され多数の出
力側を通して多数の加入者9等に電送されるとかまたは
各々の加入者9等から放送局1へ電送される信号を検出
することができる。したがって、測定棒本体11に伝達
される信号に対して内部の電源分離部15で電源成分を
除去した後、低域通過フィルタ16で5乃至30MHz
帯域のRF信号である低域成分のみを検出すると加入者
9から放送局1へ電送される上向信号を測定棒本体11
のボルト部13に連結されている測定器に伝達されるた
め、雑音が含まれているか否かを確認することができ
る。When the measuring rod body 11 is connected to one of the output sides of the splitter 8 of FIG. 1 which is a two-way coupler by screwing, it is transmitted through this input side and is transmitted through a plurality of output sides. A signal transmitted to the subscriber 9 or the like or a signal transmitted from each subscriber 9 or the like to the broadcasting station 1 can be detected. Therefore, after removing the power component from the signal transmitted to the measuring rod main body 11 by the internal power source separation unit 15, the low-pass filter 16 removes the power component from 5 to 30 MHz.
When only the low-frequency component of the band RF signal is detected, the upward signal transmitted from the subscriber 9 to the broadcasting station 1 is transmitted to the measuring rod body 11.
Is transmitted to the measuring device connected to the bolt portion 13 of the first embodiment, so that it is possible to confirm whether or not noise is included.
【0015】上記本発明は、一実施例による構成を記述
したものであって、このような実施例により本発明が制
限的に解析されてはいけない。特に、電源分離部と低域
通過フィルタの構成は種々の実現可能な構成中の一つの
みを選択して説明したものである。The present invention describes the configuration according to one embodiment, and the present invention should not be analyzed in a limited manner by such an embodiment. In particular, the configuration of the power supply separation unit and the low-pass filter has been described by selecting only one of various possible configurations.
【0016】[0016]
【発明の効果】したがって、本発明のCATV電送網の
上向帯域測定棒によっては、測定棒本体の両側に結合ボ
ルトとボルト部とを突出成形し、これを通して電源成分
が含まれた信号が伝達されるようにし、測定する部位の
両方向結合器と連結する為の結合ボルト部には接続片を
一体で突出されるように形成すると同時に、他側のボル
ト部には雑音の有無を測定する為の測定器を連結するよ
うにし、上記結合ボルト部が形成された本体の内部には
電源分離部を構成して信号に含まれた電源成分を除去制
御するようにし、上記の電源分離部には低域通過フィル
タを連結して電源成分が除去された信号中、低域の信号
である上向信号に含まれた雑音を正確に検出することが
できる。Therefore, according to the upward band measuring rod of the CATV transmission network of the present invention, a connecting bolt and a bolt portion are formed on both sides of the measuring rod main body so that a signal including a power component is transmitted through the connecting bolt. In order to measure the presence / absence of noise on the other bolt part, the connecting piece is formed so as to be integrally protruded from the coupling bolt part for connecting with the two-way coupler at the part to be measured. And a power supply separating unit is formed inside the main body in which the coupling bolt portion is formed to remove and control a power supply component included in a signal. By connecting a low-pass filter, it is possible to accurately detect noise included in an upward signal, which is a low-frequency signal, in a signal from which power components have been removed.
【0017】さらに、上記測定棒本体の一側の結合ボル
ト部を上記の両方向結合器である分配器の出力側の密閉
型のキャップを分離させた後のナット部にネジ止めによ
り締結して連結すれば、出力側と入力側との間で相互電
送される信号を検出することができ、測定棒本体で内部
の電源分離部で電源成分を除去し、低域通過フィルタで
5乃至30MHz帯域のRF信号である低域成分のみを
検出することにより、加入者から放送局へ電送される上
向信号を測定棒本体のボルト部に連結されている測定器
を利用して雑音が含まれているか否かを簡単に確認する
ことができる。Further, the connecting bolt portion on one side of the measuring rod main body is fastened and screwed to the nut portion after separating the closed cap on the output side of the distributor as the two-way coupler. Then, the signal mutually transmitted between the output side and the input side can be detected, the power supply component is removed by the internal power supply separation part with the measuring rod body, and the low pass filter of 5 to 30 MHz band. By detecting only the low frequency component that is the RF signal, whether the upward signal transmitted from the subscriber to the broadcasting station contains noise by using a measuring instrument connected to the bolt portion of the measuring rod body It can be easily confirmed whether or not.
【図1】一般的な双方向CATVサービスの為の電送シ
ステムを示した系統図。FIG. 1 is a system diagram showing a transmission system for a general two-way CATV service.
【図2】本発明の構成を示した概略図。FIG. 2 is a schematic diagram showing a configuration of the present invention.
【図3】本発明の詳細な構成を示した回路図。FIG. 3 is a circuit diagram showing a detailed configuration of the present invention.
【図4】本発明の使用状態を示した概略図。FIG. 4 is a schematic diagram showing a use state of the present invention.
11…測定棒本体 12…結合ボルト部 13…ボルト部 14…接続片 15…電源分離部 16…低域通過フィルタ DESCRIPTION OF SYMBOLS 11 ... Measurement rod main body 12 ... Connection bolt part 13 ... Bolt part 14 ... Connection piece 15 ... Power supply separation part 16 ... Low-pass filter
Claims (5)
ルト部を突出形成し、これを通して電源成分が含まれた
信号が伝達されるようにし、 測定する部位の両方向結合器と連結する為の結合ボルト
部には接続片を突出されるように形成し、 上記結合ボルト部が形成された本体の内部には電源分離
部と低域通過フィルタとを内装させて電源成分が除去さ
れた上向信号をボルト部で検出されるように構成される
ことを特徴とするCATV電送網の上向帯域測定棒。1. A connecting bolt portion and a bolt portion are formed on both sides of a measuring rod main body so that a signal including a power component is transmitted through the connecting bolt portion so as to be connected to a two-way coupler of a portion to be measured. A connection piece is formed so as to protrude from the connection bolt portion, and a power supply separation portion and a low-pass filter are provided inside the body in which the connection bolt portion is formed to remove power components. An upstream band measurement rod for a CATV transmission network, wherein the upstream signal is configured to be detected at a volt portion.
源分離部は、二つのコンデンサ及びインダクタンスによ
り構成され、接続片を通して流入される信号に含まれた
電源成分をバイパスさせるようにしたことを特徴とする
請求項1記載のCATV電送網の上向帯域測定棒。2. The power supply separating section connected to the connection piece of the measuring rod main body is constituted by two capacitors and an inductance so as to bypass a power supply component included in a signal flowing through the connection piece. The upward measuring band of the CATV transmission network according to claim 1, characterized in that:
る低域通過フィルタは、上記の電源分離部で電源成分が
除去された信号が四つのインダクタンスの直列接続を通
過しながら上記インダクタンスの前後段でコンデンサま
たはインダクタンスとコンデンサとの直列接続を通して
接地されるようにして、5乃至30MHz帯域のRF信
号である上向信号のみをボルト部に伝達させるように構
成されることを特徴とする請求項1記載のCATV電送
網の上向帯域測定棒。3. A low-pass filter connected to a power supply separation part of the measuring rod main body, wherein the signal from which the power supply component has been removed by the power supply separation part passes through a series connection of four inductances while the signal of the inductance is removed. The capacitor is configured to be grounded through a series connection of a capacitor or an inductance and a capacitor in the preceding and succeeding stages so that only an upward signal, which is an RF signal in a 5 to 30 MHz band, is transmitted to the volt unit. Item 7. An upward measuring band of the CATV transmission network according to Item 1.
合器である分配器と分岐器の出力側中の一つの密閉型キ
ャップを分離させた後のナット部にネジ止めにより締結
して結合するようにしたことを特徴とする請求項1記載
のCATV電送網の上向帯域測定棒。4. A connecting bolt on one side of the measuring rod main body is fastened by screwing to a nut after separating a distributor which is a two-way coupler and one closed cap on the output side of the branching device. 2. The upper band measuring rod according to claim 1, wherein the upper band is measured.
無を測定する為の測定器をネジ止めにより連結して上向
信号の雑音の包含の可否を測定するようにしたことを特
徴とする請求項1記載のCATV電送網の上向帯域測定
棒。5. A measuring device for measuring the presence or absence of noise is connected to the other bolt portion of the measuring rod main body by screwing to measure whether or not the upward signal includes noise. The upward band measuring rod of the CATV transmission network according to claim 1, wherein
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1997-47956 | 1997-09-20 | ||
KR1019970047956A KR100252305B1 (en) | 1997-09-20 | 1997-09-20 | Stick for measuring upward-band of catv |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH11112959A true JPH11112959A (en) | 1999-04-23 |
JP2979539B2 JP2979539B2 (en) | 1999-11-15 |
Family
ID=19521462
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10070215A Expired - Fee Related JP2979539B2 (en) | 1997-09-20 | 1998-03-19 | Upward band measurement rod for CATV transmission network |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP2979539B2 (en) |
KR (1) | KR100252305B1 (en) |
CN (1) | CN1080066C (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101417794B1 (en) * | 2012-07-03 | 2014-07-09 | 한국전력공사 | Instrumentation device for remote telemeter using power line communication |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63119330A (en) * | 1986-11-07 | 1988-05-24 | Hitachi Ltd | Level adjusting device |
DE3638146A1 (en) * | 1986-11-08 | 1988-06-23 | Standard Elektrik Lorenz Ag | VIDEO PLAYER WITH AT LEAST ONE VIDEO HEAD AMPLIFIER |
-
1997
- 1997-09-20 KR KR1019970047956A patent/KR100252305B1/en not_active IP Right Cessation
-
1998
- 1998-03-13 CN CN98105572A patent/CN1080066C/en not_active Expired - Fee Related
- 1998-03-19 JP JP10070215A patent/JP2979539B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2979539B2 (en) | 1999-11-15 |
KR100252305B1 (en) | 2000-04-15 |
KR19990026023A (en) | 1999-04-06 |
CN1080066C (en) | 2002-02-27 |
CN1212574A (en) | 1999-03-31 |
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