DE2708464A1 - RADIO RECEIVER - Google Patents
RADIO RECEIVERInfo
- Publication number
- DE2708464A1 DE2708464A1 DE19772708464 DE2708464A DE2708464A1 DE 2708464 A1 DE2708464 A1 DE 2708464A1 DE 19772708464 DE19772708464 DE 19772708464 DE 2708464 A DE2708464 A DE 2708464A DE 2708464 A1 DE2708464 A1 DE 2708464A1
- Authority
- DE
- Germany
- Prior art keywords
- radio receiver
- antennas
- oscillator
- spark arrester
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L3/00—Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal
- B61L3/16—Continuous control along the route
- B61L3/22—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation
- B61L3/225—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation using separate conductors along the route
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
- H01Q1/3225—Cooperation with the rails or the road
Description
7 Stuttgart 30 _Z7 Stuttgart 30 _Z
Die Erfindung bezieht sich auf einen Funkempfanger fUr ein übertragungssystem mit strahlenden Schlitzkabeln.The invention relates to a radio receiver for a transmission system with radiating slotted cables.
Wenn ein strahlendes Schlitzkabel an eine Sendestation angeschlossen und beispielsweise entlang einer Straße verlegt ist, dann ändert sich zwischen einem mobilen Funkempfänger und der Sendestation der Verlust der Übertragung mit der Länge des Schlitzkabels. Dies geschieht oftmals durch stehende Wellen. Daraus resultiert, daß zeitlich bedeutende Abschwächungen des empfangenen Signals vorhanden sind, die mit entsprechenden Nachrichtenverlusten einhergehen .When a radiating split cable is connected to a broadcasting station and is laid, for example, along a road, then changes between a mobile radio receiver and the transmitting station the loss of transmission with the length of the split cable. This often happens through standing waves. As a result, there are temporally significant attenuations in the received signal are associated with corresponding message losses.
Es ist Aufgabe der vorliegenden Erfindung, einen Funkempfänger gemäß dem Oberbegriff so auszubilden, daß keine Unterbrechungen der wiedergegebenen Nachrichten auftreten.It is the object of the present invention to design a radio receiver according to the preamble so that none Interruptions in the played messages occur.
Die Lösung dieser Aufgabe erfolgt mit den im Anspruch 1 angegebenen Mitteln. Weiterbildungen der Erfindung können den Unteransprüchen entnommen werden.This object is achieved with the means specified in claim 1. Developments of the invention can be found in the subclaims.
Wr/Scho
23.2.1977Wr / Scho
February 23, 1977
709836/0799709836/0799
Die Erfindung wird nachstehend anhand von Zeichnungen eines Ausführungsbeispiels näher erläutert. Es zeigen:The invention is explained below with reference to drawings an exemplary embodiment explained in more detail. Show it:
Fig.2 polare Diagramme der Antennen gemäß Fig.1 und Fig.3 ein Diagramm der empfangenen Signale.Fig.2 polar diagrams of the antennas according to Fig.1 and 3 shows a diagram of the signals received.
Der Funkempfänger in Fig.1 enthält zwei Ferritstabantennen 1 und. 2, die alternierend durch einen Umschalter 2 an den Eingang eines VHF-Funkempfängers 4 gelegt werden. Der Umschalter 3 wird von einem Oszillator 5 gesteuert, der auf einer Frequenz im Bereich von 5 bis 20 kHz schwingt. Die beiden Antennen sind gemeinsam an einer Stelle horizontal angeordnet und stehen im rechten Winkel zueinander. Der Ferritstab der Antenne 1 ist parallel zur Bewegungsrichtung des mobilen Funkempfängers ausgerichtet» wenn dieser in einem Automobil 8 untergebracht ist. Damit liegt er auch parallel zu einem strahlenden Schlitzkabel 6, das entlang einer Straße 7 verlegt ist.The radio receiver in Fig.1 contains two ferrite rod antennas 1 and. 2, which are alternately switched by a switch 2 the input of a VHF radio receiver 4 can be placed. The changeover switch 3 is controlled by an oscillator 5 which operates at a frequency in the range from 5 to 20 kHz swings. The two antennas are arranged horizontally together at one point and are at right angles to each other. The ferrite rod of antenna 1 is aligned parallel to the direction of movement of the mobile radio receiver » if this is housed in an automobile 8. It is thus also parallel to a radiating slotted cable 6, which is laid along a road 7.
Die polaren Diagramme der Antennen sind in Fig.2 dargestellt. In der Draufsicht sind die Antennen als geschlossene Schleifen dargestellt. Die entsprechenden polaren Diagramme 1a und 2a stellen sich als Sektionen über den Zentren der Schleifen dar, d.h. sie sind ringförmige horizontale Sektionen.The polar diagrams of the antennas are shown in Figure 2. In the top view, the antennas are shown as closed loops. The corresponding polar diagrams 1a and 2a represent themselves as sections above the centers of the loops, i.e. they are annular horizontal sections.
in den zwei einzelnen Antennen, die je eine Schleifenflächein the two individual antennas, each with a loop surface
709836/0799709836/0799
ι»ι »
von 1m aufweisen, und die vertikal gehalten werden und mit ihren Nullachsen im rechten Winkel zueinander stehen, dargestellt. Die ausgezogene Linie zeigt die Änderung der Feldstärke der Antenne, deren Nullachse parallel zum strahlenden Schlitzkabel ausgerichtet ist. Die gestrichelte Linie stellt den Feldstärkeverlauf der anueren Antenne dar, deren Nullachse senkrecht auf üuiv Schlitzkabel steht. Die verwendete Trägerfrequenz beträgt 4857 kHz und die Messungen werden in einem Abstand von 4,2 Meter vom Schlitzkabel durchgeführt. Es zeigt sich, daß dort/ wo starke Einbrüche im Feldstärkesignal der einen Antenne vorhanden sind, z.B. wo der Empfangspegel unter -40 dB gegenüber einem gemeinsamen Referenzpegel absinkt, im Feldstärkeverlauf der anderen Antenne Im allgemeinen eine Spitze vorhanden ist. Wenn daher die Antennen alternierend mit einer genügend hohen Schaltfrequenz an den Eingang des Funkempfängers gelegt werden, wird der durchschnittliche Pegel des an den Funkempfänger geführten Signals über einem annehmbaren minimalen Pegel liegen, sogar zu den Zeiten, in denen der Signalpegel der einen Antenne wesentlich unterhalb des minimalen Pegels liegt, d.h. es wird eine Art Polaritäts-Diversity erreicht, bei der die Verluste immer unter 3 dB, bezogen auf das schwächste Signal, bleiben.of 1m, and which are held vertically and have their zero axes at right angles to each other, shown. The solid line shows the change in the field strength of the antenna, the zero axis of which is aligned parallel to the radiating split cable. The dashed line represents the course of the field strength of the outer antenna, the zero axis of which is perpendicular to the slotted cable. The carrier frequency used is 4857 kHz and the measurements are carried out at a distance of 4.2 meters from the split cable. It turns out that there / where there are strong drops in the field strength signal of one antenna, e.g. where the reception level drops below -40 dB compared to a common reference level, there is generally a peak in the field strength curve of the other antenna. Therefore, if the antennas are alternately connected to the input of the radio receiver with a sufficiently high switching frequency, the average level of the signal sent to the radio receiver will be above an acceptable minimum level, even at times when the signal level of one antenna is significantly below the minimum level, ie a kind of polarity diversity is achieved in which the losses always remain below 3 dB, based on the weakest signal.
4 Ansprüche
2 Bl. Zchng.4 claims
2 sheets drawing
LeerseiteBlank page
Claims (4)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB870676A GB1498388A (en) | 1976-03-04 | 1976-03-04 | Mobile radio receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2708464A1 true DE2708464A1 (en) | 1977-09-08 |
Family
ID=9857677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19772708464 Withdrawn DE2708464A1 (en) | 1976-03-04 | 1977-02-26 | RADIO RECEIVER |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2708464A1 (en) |
| GB (1) | GB1498388A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998020626A1 (en) * | 1996-11-01 | 1998-05-14 | Plantronics, Inc. | Aerial arrays for inductive communication systems |
| US6061030A (en) * | 1996-11-01 | 2000-05-09 | Plantronics, Inc. | Aerial arrays for magnetic induction communication systems having limited power supplies |
| US6134420A (en) * | 1996-11-01 | 2000-10-17 | Plantronics, Inc. | Vector measuring aerial arrays for magnetic induction communication systems |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19739153A1 (en) * | 1997-09-06 | 1999-03-11 | Huberty Barbara | Block or bit fault dependent switch over between two aerials for reception of data from LW RDS transmitter |
| WO2000039944A1 (en) | 1998-12-24 | 2000-07-06 | Sumitomo Electric Industries, Ltd. | Communication system between road and vehicle |
-
1976
- 1976-03-04 GB GB870676A patent/GB1498388A/en not_active Expired
-
1977
- 1977-02-26 DE DE19772708464 patent/DE2708464A1/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998020626A1 (en) * | 1996-11-01 | 1998-05-14 | Plantronics, Inc. | Aerial arrays for inductive communication systems |
| US5966641A (en) * | 1996-11-01 | 1999-10-12 | Plantronics, Inc. | Aerial arrays for inductive communications systems |
| US6061030A (en) * | 1996-11-01 | 2000-05-09 | Plantronics, Inc. | Aerial arrays for magnetic induction communication systems having limited power supplies |
| US6134420A (en) * | 1996-11-01 | 2000-10-17 | Plantronics, Inc. | Vector measuring aerial arrays for magnetic induction communication systems |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1498388A (en) | 1978-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0005534B1 (en) | Device for identifying objects and persons | |
| DE2612996C2 (en) | ||
| DE3335128A1 (en) | MOBILE RADIO NETWORK | |
| EP0627717B1 (en) | Method and arrangement for wireless data exchange between a fixed station and moving objects | |
| DE2150660A1 (en) | Cross dipole antenna | |
| DE19806914A1 (en) | Method and device for calibrating a group antenna | |
| EP0643438B1 (en) | Leaky coaxial cable for radio frequency | |
| DE879404C (en) | Device for spatial direction finding | |
| DE2708464A1 (en) | RADIO RECEIVER | |
| DE2744127B2 (en) | Duplex microwave radio system | |
| DE1082942B (en) | Surface wave transmission system for communication with vehicles | |
| DE2428583A1 (en) | HF receive aerial on trains - receives from track-side aerial and has two elements located in maximum and minimum areas of field | |
| DE3632984C2 (en) | ||
| DE3739809C2 (en) | ||
| DE2626925A1 (en) | Compensation for signal fading in communication system - uses single antenna and compares signals received at different angles of incidence | |
| DE4319347C2 (en) | Communication system for a crane system | |
| DE2939679C2 (en) | System switch for a satellite radio system | |
| EP0645900B1 (en) | Method and apparatus for data transmission by means of circular polarized waves | |
| DE2931084C3 (en) | Radio system | |
| DE3713086A1 (en) | Communications system with space diversity | |
| DE614586C (en) | Arrangement for the automatic display of the position of vehicles, especially airplanes | |
| EP0506677A1 (en) | Reception aerial process and system | |
| DE690405C (en) | Arrangement for achieving changes in direction of an antenna directional diagram | |
| DE2938871C2 (en) | ||
| DE3347743C2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8139 | Disposal/non-payment of the annual fee |