EP1195932A2 - RF-Device Comprizing Level Detection for Noise Suppression - Google Patents
RF-Device Comprizing Level Detection for Noise Suppression Download PDFInfo
- Publication number
- EP1195932A2 EP1195932A2 EP01119897A EP01119897A EP1195932A2 EP 1195932 A2 EP1195932 A2 EP 1195932A2 EP 01119897 A EP01119897 A EP 01119897A EP 01119897 A EP01119897 A EP 01119897A EP 1195932 A2 EP1195932 A2 EP 1195932A2
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- EP
- European Patent Office
- Prior art keywords
- input
- level
- frequency device
- threshold value
- antenna socket
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- 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.)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
Definitions
- the invention relates to a high-frequency device, in particular an antenna socket, according to the features of the preamble of claim 1.
- Devices of this type are for the transmission and / or processing of high-frequency signals for passive and active facilities such as the so-called network terminal units (NTU) and in particular as antenna sockets, distributors, Tap and amplifier known.
- NTU network terminal units
- antenna sockets, distributors, Tap and amplifier known.
- a modem sends to the antenna socket or to the NTU is connected to the distribution network at a level of approximately 113 dB ⁇ V about 5 to 65 MHz.
- the modem still has interference / noise performance of approx. 40 dB ⁇ V, which is fed into the distribution network.
- the interference level increases by the log of ten the number of participants, so that in the summation point interference level in very quickly intolerable size (especially 73dB ⁇ V with 2000 participants) can be achieved.
- the invention is therefore based on the object of a high-frequency device, in particular to provide an antenna socket, which the coupling of interference into the Distribution network, especially in return channel operation, prevented.
- the high-frequency device has detection means for detecting the Level at the input and switching means that depend on the level detected switch on.
- the detection means can be used to determine whether, on the high-frequency device, which is assumed as an antenna socket in the following Device such as B. a modem is connected or not. Be levels that are above a certain threshold, detected, this represents the connection of a device, in particular, the transmission mode of the modem is recognized and its signals are forwarded to the distribution network. If the detected levels are below a certain level Value, it is automatically recognized that it is interference signals or noise. These signals are blocked by the switching means and can not in the Distribution network. This makes the injection of interference levels into the Distribution network avoided, so that its operation is properly ensured.
- the switching means have a threshold value specification, when the threshold value is exceeded or undershot by the detected level Switch is actuated. If the detected level is above the threshold value, or the switch remains closed, so that a connection of the input of the antenna socket to its exit, i.e. in the direction of the distribution network. Is the detected level below the threshold, the switch is or remains open, so that the interference signals cannot get into the distribution network.
- the threshold value specification for the level (input level) adjustable allows the antenna socket to meet the requirements of the distribution network, in particular depending on the connected participants.
- the threshold value can be set once by the manufacturer or by the user once or as often as required before or after installing the antenna socket is changeable.
- the means, in particular the acquisition and Switching means at least partially, preferably entirely, of discrete electronic Components built.
- the antenna socket can be implemented inexpensively, the discrete electronic components housed in the smallest space can be, especially if the components are SMD components is.
- An integration of the components as ASIC is also conceivable.
- the high-frequency device in particular the antenna socket, trained as a passive device.
- This has the advantage that there are no additional lines and does not need an external power supply, which makes it easy to install and applicability is significantly improved and simplified by the user.
- the antenna socket according to the invention can thus against conventional antenna sockets be replaced. From the signal energy present at the input a small part used to operate the switching means. This will be more advantageous The RF signal is equally weighted and the DC voltage thus generated Actuation of the switching means used.
- FIG. 1 shows an antenna socket 1 which has at least one input E and one Output A has.
- a modem is connected to input E, whose signals are fed via output A into the distribution network connected there become.
- a detector 2 is integrated, which at the input E applied level detected.
- a threshold value specification 3 is connected downstream of the detector 2, which acts on a switch 4, which is in the signal path between the input E and the Exit A is located.
- the detector 2 and the threshold value specification 3 can also form one Threshold switches can be summarized.
- the mode of operation of the detection means and the switching means is as follows:
- a specific value for the level is specified. Lies the detected value of the level at input E below this predetermined value this is detected by the detector 2, whereby the switch 4 remains open when it is already was opened or is opened when it was closed. This prevents the Level too low, indicating a malfunction or noise when the or is not connected represents non-sending modem, is fed into the distribution network.
- is on Input E is connected to a modem or any other device and is located Level at input E above the specified value, this means that the signals of the modem are to be fed into the distribution network (return channel operation). Because of the detector 2 detected level at input E is above this value, the Switch 4 closed if it was open, or remains closed if it was already was closed. Thus, the signal path between the input E and the output A closed and the modem signals can be fed into the distribution network.
- Figure 2 shows the attenuation curve of the switching means as a function of the input level.
- the modem transmission mode is from that Detector 2 detected and its signal by closing or by the closed Switch 4 forwarded.
- the specification of the threshold is here just below 90 dB ⁇ V
- levels well below 90 dB ⁇ V, especially less than 80 dB ⁇ V, are recognized as interference level or as noise, so that the switch 4 remains open or is opened and blocks the signals present at input E.
- FIG. 2 is the input level EP on the X axis and the corresponding one on the Y axis Damping D shown.
- the remaining basic attenuation of approx. 2 dB results from the power consumption of the RF signal to obtain the required switching power for the switching means (such as a diode, transistor or the like).
- Figure 3 shows a circuit diagram with electronic components, individually or combined (z. B. in an Asic) can be integrated in the antenna socket 1.
- smoothing capacitors C are present at input E and at output A.
- the signal energy of the modem connected to input E is transmitted via the Capacitor C to a transformer TR, in which the applied RF voltage is transformed up so that the required voltage for the subsequent components is available.
- a transformer TR in which the applied RF voltage is transformed up so that the required voltage for the subsequent components is available.
- the transformer TR connected diode D1 to about 500 millivolts by the Diode D1 can be rectified.
- the downstream resistor R1 is a load resistor, which is connected to ground.
- the capacitor downstream of the diode D1 C1 serves as a filter capacitor.
- the diode D1 is a choke DR in the direction downstream of the signal path between input E and output A.
- This throttle DR has the task of direct current flowing through the diode D1 in the direction of Pass through signal paths, so that it is caused that the switching means in the form a diode D2 becomes conductive, which is connected with its cathode to ground.
- the Choke DR forms a high resistance at high frequencies, so that a short circuit is prevented by the choke DR against ground for HF signals.
- the diode D2 Through the in the diode D2 impressed current, which is only present when a signal is present at input E. the diode D2 conductive, so that the signal path between input E and output A is released.
- the diode blocks that insufficient current can be impressed into the diode D2 D2 the signal path between input E and output A.
- the circuit shown in Figure 3 (in particular by choosing the components and, if necessary can be modified by omitting or adding components). So could for example be considered, the capacitor C1 and the inductor DR omit, it is also conceivable as switching means not a diode, but others to use electrical components (such as transistors or the like).
- the high-frequency device in particular the antenna socket, for connecting a device, preferably also for connection several devices can be formed.
- the antenna socket is designed to have a television and a modem Connect the radio to the distribution network.
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Noise Elimination (AREA)
- Radio Transmission System (AREA)
Abstract
Description
Die Erfindung betrifft ein Hochfrequenzgerät, insbesondere eine Antennensteckdose,
gemäß den Merkmalen des Oberbegriffes des Patentanspruches 1.The invention relates to a high-frequency device, in particular an antenna socket,
according to the features of the preamble of
Geräte dieser Art sind zur Übertragung und/oder zur Verarbeitung von Hochfrequenzsignalen bei passiven und aktiven Einrichtungen wie etwa den sogenannten Network-Terminal-Units (NTU) und dabei insbesondere als Antennensteckdosen, Verteiler, Abzweiger und Verstärker bekannt.Devices of this type are for the transmission and / or processing of high-frequency signals for passive and active facilities such as the so-called network terminal units (NTU) and in particular as antenna sockets, distributors, Tap and amplifier known.
Bei der Übertragung bzw. Verarbeitung der Hochfrequenzsignale in Verteilnetzen stellt der störungsfreie Rückkanalbetrieb ein wesentliches Qualitätsmerkmal dar. Hierbei ist bei interaktiven Kommunikationssystemen der resultierende Signal-/Störabstand und damit die Bitfehlerrate ein entscheidender Faktor.When transmitting or processing the high-frequency signals in distribution networks Trouble-free return channel operation is an essential quality feature interactive communication systems the resulting signal-to-noise ratio and thus the bit error rate is a crucial factor.
Bei Verteilnetzen mit einer großen Vielzahl von Teilnehmern summieren sich die einzelnen Störungen und Rauschleistungen im Kanal so stark, daß ein einwandfreier Betrieb der angeschlossenen Geräte nicht mehr gegeben ist.In the case of distribution networks with a large number of subscribers, they add up individual interference and noise power in the channel so strong that a flawless Operation of the connected devices is no longer possible.
So sendet beispielsweise ein Modem, welches an die Antennensteckdose bzw. an das NTU angeschlossen ist, mit einem Pegel von ungefähr 113 dBµV in das Verteilnetz bei etwa 5 bis 65 MHz. Im Empfangsmodus hat das Modem noch eine Stör-/Rauschleistung von ca. 40 dBµV, die in das Verteilnetz eingespeist wird. Je nach Anzahl der Teilnehmer, die an dem Verteilnetz angeschlossen sind, erhöht sich der Störpegel um den Zehnerlogarithmus der Teilnehmerzahl, so daß im Summationspunkt sehr schnell Störpegel in untragbarer Größe (insbesondere 73dBµV bei 2000 Teilnehmern) erreicht werden. Legt man einen Signal-/Störabstand der Quelle von 60 dB zugrunde, ergibt sich daher nur ein Gesamtstörabstand von der Hälfte oder sogar kleiner (zum Beispiel ein Störabstand von 113 dBµV bis 73 dBµV = 40 dB). Hinzu kommen noch weitere Störquellen, wie z.B. Fernsehgeräte, Kurzwellensender, Amateur-/ oder CB-Funk, Lichtdimmer und dergleichen, die ebenfalls über die Antennensteckdose in das Verteilnetz eingespeist werden. Dies hat in nachteiliger Weise die Folge, daß das weitere Absinken des Störabstandes den Rückkanal nicht nur weiter einschränkt, sondern vollkommen unmöglich macht.For example, a modem sends to the antenna socket or to the NTU is connected to the distribution network at a level of approximately 113 dBµV about 5 to 65 MHz. In the receive mode, the modem still has interference / noise performance of approx. 40 dBµV, which is fed into the distribution network. Depending on the number of participants, that are connected to the distribution network, the interference level increases by the log of ten the number of participants, so that in the summation point interference level in very quickly intolerable size (especially 73dBµV with 2000 participants) can be achieved. sets based on a signal / signal-to-noise ratio of 60 dB, the result is only one Total signal-to-noise ratio of half or even less (for example, a signal-to-noise ratio of 113 dBµV to 73 dBµV = 40 dB). There are also other sources of interference, such as TV sets, shortwave transmitters, amateur or CB radio, light dimmers and the like, which are also fed into the distribution network via the antenna socket. This has the disadvantageous consequence that the further reduction in the signal-to-noise ratio not only further restrict the return channel, but make it completely impossible.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Hochfrequenzgerät, insbesondere eine Antennensteckdose, bereitzustellen, welche das Einkoppeln von Störungen in das Verteilnetz, insbesondere im Rückkanalbetrieb, verhindert.The invention is therefore based on the object of a high-frequency device, in particular to provide an antenna socket, which the coupling of interference into the Distribution network, especially in return channel operation, prevented.
Diese Aufgabe ist durch die Merkmale des Patentanspruches 1 gelöst.This object is solved by the features of
Erfindungsgemäß weist das Hochfrequenzgerät Erfassungsmittel zur Erfassung des Pegels an dem Eingang sowie Schaltmittel, die in Abhängigkeit des erfaßten Pegels schalten, auf. Mit den Erfassungsmitteln kann erkannt werden, ob an dem Hochfrequenzgerät, von dem im weiteren beispielhaft als Antennensteckdose ausgegangen wird, ein Gerät, wie z. B. ein Modem angeschlossen ist oder nicht. Werden Pegel, die oberhalb einer bestimmten Schwelle liegen, erfaßt, stellt dies den Anschluß eines Gerätes dar, inbesondere wird auf den Sendebetrieb des Modems erkannt und dessen Signale werden in das Verteilnetz weitergeleitet. Liegen die erfaßten Pegel unterhalb eines bestimmten Wertes, wird automatisch erkannt, daß es sich um Störsignale bzw. Rauschen handelt. Diese Signale werden durch die Schaltmittel abgeblockt und können nicht in das Verteilnetz gelangen. Damit wird wirksam die Einspeisung von Störpegeln in das Verteilnetz vermieden, so daß dessen Betrieb einwandfrei sichergestellt ist.According to the invention, the high-frequency device has detection means for detecting the Level at the input and switching means that depend on the level detected switch on. The detection means can be used to determine whether, on the high-frequency device, which is assumed as an antenna socket in the following Device such as B. a modem is connected or not. Be levels that are above a certain threshold, detected, this represents the connection of a device, in particular, the transmission mode of the modem is recognized and its signals are forwarded to the distribution network. If the detected levels are below a certain level Value, it is automatically recognized that it is interference signals or noise. These signals are blocked by the switching means and can not in the Distribution network. This makes the injection of interference levels into the Distribution network avoided, so that its operation is properly ensured.
In Weiterbildung der Erfindung weisen die Schaltmittel eine Schwellwertvorgabe auf, wobei bei Über- oder Unterschreitung des Schwellwertes durch den erfaßten Pegel ein Schalter betätigbar ist. Liegt der erfaßte Pegel oberhalb des Schwellwertes, wird oder bleibt der Schalter geschlossen, so daß eine Verbindung des Einganges der Antennensteckdose zu dessen Ausgang, also in Richtung des Verteilnetzes, gegeben ist. Liegt der erfaßte Pegel unterhalb des Schwellwertes, wird oder bleibt der Schalter geöffnet, so daß die Störsignale nicht in das Verteilnetz gelangen können.In a development of the invention, the switching means have a threshold value specification, when the threshold value is exceeded or undershot by the detected level Switch is actuated. If the detected level is above the threshold value, or the switch remains closed, so that a connection of the input of the antenna socket to its exit, i.e. in the direction of the distribution network. Is the detected level below the threshold, the switch is or remains open, so that the interference signals cannot get into the distribution network.
In Weiterbildung der Erfindung ist die Schwellwertvorgabe für den Pegel (Eingangspegel) einstellbar. Damit kann die Antennensteckdose den Gegebenheiten des Verteilnetzes, insbesondere in Abhängigkeit der angeschlossenen Teilnehmer, eingestellt werden. Hier ist es denkbar, daß die Schwellwertvorgabe herstellerseitig einmalig einstellbar ist oder vom Anwender vor oder nach Einbau der Antennensteckdose einmalig oder beliebig oft veränderbar ist.In a further development of the invention, the threshold value specification for the level (input level) adjustable. This allows the antenna socket to meet the requirements of the distribution network, in particular depending on the connected participants. Here it is conceivable that the threshold value can be set once by the manufacturer or by the user once or as often as required before or after installing the antenna socket is changeable.
In Weiterbildung der Erfindung sind die Mittel, insbesondere die Erfassungs- und Schaltmittel, zumindest teilweise, vorzugsweise insgesamt, aus diskreten elektronischen Bauelementen aufgebaut. Damit ist die Antennensteckdose kostengünstig realisierbar, wobei die diskreten elektronischen Bauelemente auf kleinstem Raum untergebracht werden können, insbesondere dann, wenn es sich bei den Bauelementen um SMD-Bauelemente handelt. Eine Integration der Bauteile als ASIC ist dabei auch denkbar.In a further development of the invention, the means, in particular the acquisition and Switching means, at least partially, preferably entirely, of discrete electronic Components built. This means that the antenna socket can be implemented inexpensively, the discrete electronic components housed in the smallest space can be, especially if the components are SMD components is. An integration of the components as ASIC is also conceivable.
In Weiterbildung der Erfindung ist das Hochfrequenzgerät, insbesondere die Antennensteckdose, als passives Gerät ausgebildet. Dies hat den Vorteil, daß es ohne Zusatzleitungen und ohne externe Stromversorgung auskommt, wodurch die Montagefreundlichkeit und Anwendbarkeit durch den Anwender deutlich verbessert und vereinfacht wird. Die erfindungsgemäße Antennensteckdose kann somit gegen herkömmliche Antennensteckdosen ausgetauscht werden. Von der am Eingang anstehenden Signalenergie wird ein kleiner Teil dazu genutzt, das Schaltmittel zu betätigen. Dazu wird in vorteilhafter Weise das HF-Signal gleichgewichtet und die somit erzeugte Gleichspannung zur Betätigung des Schaltmittels eingesetzt.In a further development of the invention, the high-frequency device, in particular the antenna socket, trained as a passive device. This has the advantage that there are no additional lines and does not need an external power supply, which makes it easy to install and applicability is significantly improved and simplified by the user. The antenna socket according to the invention can thus against conventional antenna sockets be replaced. From the signal energy present at the input a small part used to operate the switching means. This will be more advantageous The RF signal is equally weighted and the DC voltage thus generated Actuation of the switching means used.
Ein Ausführungsbeispiel einer erfindungsgemäßen Antennensteckdose, auf das die Erfindung jedoch nicht beschränkt ist, ist im folgenden erläutert und anhand der Figuren beschrieben.An embodiment of an antenna socket according to the invention, on which However, the invention is not limited, is explained below and with reference to the figures described.
Es zeigen:
Figur 1- eine erfindungsgemäße Antennensteckdose,
Figur 2- einen Dämpfungsverlauf,
Figur 3- ein Schaltbild.
- Figure 1
- an antenna socket according to the invention,
- Figure 2
- a damping curve,
- Figure 3
- a circuit diagram.
Figur 1 zeigt eine Antennensteckdose 1, die zumindest einen Eingang E sowie einen
Ausgang A aufweist. An dem Eingang E ist beispielsweise ein Modem angeschlossen,
dessen Signale über den Ausgang A in das dort angeschlossene Verteilnetz eingespeist
werden. In der Antennensteckdose 1 ist ein Detektor 2 integriert, der den am Eingang E
anliegenden Pegel erfaßt. Dem Detektor 2 ist eine Schwellwertvorgabe 3 nachgeschaltet,
die auf einen Schalter 4 wirkt, der sich im Signalpfad zwischen dem Eingang E und dem
Ausgang A befindet. Der Detektor 2 und die Schwellwertvorgabe 3 können auch zu einem
Schwellwertschalter zusammengefaßt werden.FIG. 1 shows an
Die Wirkungsweise der Erfassungsmittel sowie der Schaltmittel ist die folgende:The mode of operation of the detection means and the switching means is as follows:
Mit der Schwellwertvorgabe 3 ist ein bestimmter Wert für den Pegel vorgegeben. Liegt
der erfaßte Wert des Pegels am Eingang E unterhalb dieses vorgegebenen Wertes, wird
dies von dem Detektor 2 erfaßt, wodurch der Schalter 4 geöffnet bleibt, wenn er schon
geöffnet war oder geöffnet wird, wenn er geschlossen war. Damit wird verhindert, daß der
zu niedrige Pegel, der eine Störung bzw. ein Rauschen bei nicht angeschlossenem oder
nicht sendenden Modem darstellt, in das Verteilnetz eingespeist wird. Ist hingegen am
Eingang E ein Modem oder ein sonstiges beliebiges Gerät angeschlossen und liegt der
Pegel am Eingang E oberhalb des vorgegebenen Wertes, bedeutet dies, daß die Signale
des Modems in das Verteilnetz eingespeist werden sollen (Rückkanalbetrieb). Da der von
dem Detektor 2 erfaßte Pegel am Eingang E oberhalb dieses Wertes liegt, wird der
Schalter 4 geschlossen, falls er geöffnet war, bzw. bleibt geschlossen, wenn er schon
geschlossen war. Somit wird der Signalpfad zwischen dem Eingang E und dem Ausgang
A geschlossen und die Modem-Signale können in das Verteilnetz eingespeist werden.With the
Figur 2 zeigt den Dämpfungsverlauf der Schaltmittel in Abhängigkeit des Eingangspegels.
Bei Pegeln EP von etwa 90 dBµV und größer wird der Modem-Sendebetrieb von dem
Detektor 2 erkannt und dessen Signal durch Schließen oder durch den geschlossenen
Schalter 4 weitergeleitet. Die Vorgabe des Schwellwertes liegt hier etwa knapp unterhalb
90 dBµV Bei Pegeln, die deutlich unterhalb von 90 dBµV, insbesondere kleiner als 80
dBµV, liegen, werden als Störpegel bzw. als Rauschen erkannt, so daß der Schalter 4
geöffnet bleibt oder geöffnet wird und die am Eingang E anliegenden Signale abblockt. In
Figur 2 ist auf der X-Achse der Eingangspegel EP und auf der Y-Achse die entsprechende
Dämpfung D dargestellt. Die verbleibende Grunddämpfung von ca. 2 dB resultiert aus
der Leistungsentnahme des HF-Signals zur Gewinnung der benötigten Schaltleistung für
die Schaltmittel (wie Diode, Transistor oder dergleichen).Figure 2 shows the attenuation curve of the switching means as a function of the input level.
At EP levels of about 90 dBµV and higher, the modem transmission mode is from that
Figur 3 zeigt ein Schaltbild mit elektronischen Bauelementen, die einzeln oder zusammengefaßt
(z. B. in einem Asic) in der Antennensteckdose 1 integriert sein können.
Zunächst sind am Eingang E und am Ausgang A Glättungskondensatoren C vorhanden. Figure 3 shows a circuit diagram with electronic components, individually or combined
(z. B. in an Asic) can be integrated in the
Die Signalenergie des am Eingang E angeschlossenen Modems gelangt über den Kondensator C zu einem Transformator TR, in welchem die anliegende HF-Spannung hochtransformiert wird, damit für die nachfolgenden Bauteile die erforderliche Spannung zur Verfügung steht. Liegen am Eingang E beispielsweise 100 dBµV bei einem 75 Ohm Abschluß an, entspricht dies einer Spannung von 100 Millivolt, die durch den Transformator TR beispielsweise im Verhältnis 1:5 hochtransformiert wird. Damit liegen an der dem Transformator TR nachgeschalteten Diode D1 etwa 500 Millivolt an, die von der Diode D1 gleichgerichtet werden. Der nachgeschaltete Widerstand R1 ist ein Lastwiderstand, der gegen Masse geschaltet ist. Der der Diode D1 nachgeschaltete Kondensator C1 dient als Siebkondensator. Weiterhin ist der Diode D1 eine Drossel DR in Richtung des Signalpfades zwischen Eingang E und Ausgang A nachgeschaltet. Diese Drossel DR hat die Aufgabe, den durch die Diode D1 fließenden Gleichstrom in Richtung des Signalpfades durchzulassen, so daß dadurch bewirkt wird, daß das Schaltmittel in Form einer Diode D2 leitend wird, die mit ihrer Kathode gegen Masse geschaltet ist. Die Drossel DR bildet bei hohen Frequenzen einen hohen Widerstand, so daß ein Kurzschluß über die Drossel DR gegen Masse für HF-Signale verhindert wird. Durch den in die Diode D2 eingeprägten Strom, der nur vorliegt bei Anliegen eines Signales am Eingang E, wird die Diode D2 leitend, so daß der Signalpfad zwischen Eingang E und Ausgang A freigegeben ist. Liegt am Eingang E keine Spannung an oder eine so geringe Spannung, daß kein ausreichender Strom in die Diode D2 eingeprägt werden kann, sperrt die Diode D2 den Signalpfad zwischen Eingang E und Ausgang A. Es versteht sich von selbst, daß die in Figur 3 gezeigte Schaltung (insbesondere durch Wahl der Bauteile und gegebenenfalls durch Weglassen oder Hinzufügen von Bauteilen) modifiziert werden kann. So könnte beispielsweise daran gedacht werden, den Kondensator C1 und die Drossel DR wegzulassen, wobei es auch denkbar ist, als Schaltmittel keine Diode, sondern andere elektrische Bauteile (wie Transistoren oder dergleichen) zu verwenden.The signal energy of the modem connected to input E is transmitted via the Capacitor C to a transformer TR, in which the applied RF voltage is transformed up so that the required voltage for the subsequent components is available. For example, at input E there are 100 dBµV at 75 ohms At the end, this corresponds to a voltage of 100 millivolts through the transformer TR is transformed up in a ratio of 1: 5, for example. So that's because the transformer TR connected diode D1 to about 500 millivolts by the Diode D1 can be rectified. The downstream resistor R1 is a load resistor, which is connected to ground. The capacitor downstream of the diode D1 C1 serves as a filter capacitor. Furthermore, the diode D1 is a choke DR in the direction downstream of the signal path between input E and output A. This throttle DR has the task of direct current flowing through the diode D1 in the direction of Pass through signal paths, so that it is caused that the switching means in the form a diode D2 becomes conductive, which is connected with its cathode to ground. The Choke DR forms a high resistance at high frequencies, so that a short circuit is prevented by the choke DR against ground for HF signals. Through the in the diode D2 impressed current, which is only present when a signal is present at input E. the diode D2 conductive, so that the signal path between input E and output A is released. If there is no voltage at input E or such a low voltage, the diode blocks that insufficient current can be impressed into the diode D2 D2 the signal path between input E and output A. It goes without saying that the circuit shown in Figure 3 (in particular by choosing the components and, if necessary can be modified by omitting or adding components). So could for example be considered, the capacitor C1 and the inductor DR omit, it is also conceivable as switching means not a diode, but others to use electrical components (such as transistors or the like).
Es sei noch ergänzend darauf hingewiesen, daß das Hochfrequenzgerät, insbesondere die Antennensteckdose, zum Anschluß eines Gerätes, vorzugsweise auch zum Anschluß mehrerer Geräte ausgebildet sein kann. Insbesondere ist es denkbar, daß die Antennensteckdose dazu ausgebildet ist, neben einem Modem auch ein Fernsehgerät und ein Rundfunkgerät an das Verteilnetz anzuschließen.It should also be pointed out that the high-frequency device, in particular the antenna socket, for connecting a device, preferably also for connection several devices can be formed. In particular, it is conceivable that the antenna socket is designed to have a television and a modem Connect the radio to the distribution network.
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10047239 | 2000-09-23 | ||
| DE2000147239 DE10047239A1 (en) | 2000-09-23 | 2000-09-23 | High frequency device with level detection for interference suppression |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1195932A2 true EP1195932A2 (en) | 2002-04-10 |
| EP1195932A3 EP1195932A3 (en) | 2004-07-14 |
| EP1195932B1 EP1195932B1 (en) | 2009-07-15 |
Family
ID=7657402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20010119897 Expired - Lifetime EP1195932B1 (en) | 2000-09-23 | 2001-08-17 | RF-Device Comprising Level Detection for Noise Suppression |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1195932B1 (en) |
| DE (2) | DE10047239A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1750383A3 (en) * | 2005-08-04 | 2008-05-07 | Kathrein-Werke KG | High frequency socket for connection to coaxial cable systems |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998004054A1 (en) * | 1996-07-18 | 1998-01-29 | Ericsson Inc. | System and method for reducing cumulative noise in a distributed antenna network |
-
2000
- 2000-09-23 DE DE2000147239 patent/DE10047239A1/en not_active Ceased
-
2001
- 2001-08-17 EP EP20010119897 patent/EP1195932B1/en not_active Expired - Lifetime
- 2001-08-17 DE DE50114987T patent/DE50114987D1/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998004054A1 (en) * | 1996-07-18 | 1998-01-29 | Ericsson Inc. | System and method for reducing cumulative noise in a distributed antenna network |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1750383A3 (en) * | 2005-08-04 | 2008-05-07 | Kathrein-Werke KG | High frequency socket for connection to coaxial cable systems |
| US7777590B2 (en) | 2005-08-04 | 2010-08-17 | Kathrein-Werke Kg | HF socket |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50114987D1 (en) | 2009-08-27 |
| DE10047239A1 (en) | 2002-04-25 |
| EP1195932A3 (en) | 2004-07-14 |
| EP1195932B1 (en) | 2009-07-15 |
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