DE554400C - Device for the interference-free reception of long waves in the vicinity of a short-wave transmitter - Google Patents
Device for the interference-free reception of long waves in the vicinity of a short-wave transmitterInfo
- Publication number
- DE554400C DE554400C DE1930554400D DE554400DA DE554400C DE 554400 C DE554400 C DE 554400C DE 1930554400 D DE1930554400 D DE 1930554400D DE 554400D A DE554400D A DE 554400DA DE 554400 C DE554400 C DE 554400C
- Authority
- DE
- Germany
- Prior art keywords
- interference
- short
- vicinity
- wave transmitter
- grid
- 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.)
- Expired
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
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1018—Means associated with receiver for limiting or suppressing noise or interference noise filters connected between the power supply and the receiver
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Superheterodyne Receivers (AREA)
- Circuits Of Receivers In General (AREA)
Description
Bei Empfang langer Wellen in unmittelbarer Nähe eines Kurzwellensenders treten häufig starke Störungen durch den Sender auf, die einen Empfang unmöglich machen. Einbau des Empfängers in einen Metallkasten und Erhöhung der Selektion durch Vermehrung der Abstimmkreise nützen gar nichts.When receiving long waves, step in the immediate vicinity of a shortwave transmitter often strong interference from the transmitter, which makes reception impossible. Installing the receiver in a metal box and increasing the selection by increasing the number of voting circles are even useful nothing.
Wie die Versuche zeigen, sind bei demAs the experiments show, are with the
Vorgange die Hochfrequenzröhren nicht beteiligt, die Störungen bleiben ungeänuert, auch wenn die Hochfrequenzröhren entfernt sind. Dieses ist leicht erklärlich, weil durch die Selektionswirkung des Audionkreises praktisch keine Energie von den Hochfrequenzröhren auf das Gitter des Audions gelangen kann.Processes the high-frequency tubes are not involved, the interference remains unaffected, even if the high frequency tubes are removed. This is easy to explain because through the selection effect of the audio circuit practically no energy from the high frequency tubes can get onto the grid of the audion.
Die Wege, auf denen die störende Hochfrequenz des Kurzwellensenders an das Git-The ways in which the disruptive high frequency of the shortwave transmitter to the guitar
ao ter des Audions gelangen kann, sind folgende (s. Abb. 1):ao ter of the audion are the following (see Fig. 1):
1. Zwischen den Batterieleitungen, vornehmlich ihren Anschlußpunkten, entsteht eine EMK. Da der Heizfaden des Audions ein1. Between the battery lines, primarily their connection points, there is a EMK. As the filament of the audion a
as Teil des Schwingungskreises ist, gelangt die Störspannung über den Abstimmkondensator an das Gitter.as part of the oscillation circuit, the Interference voltage across the tuning capacitor to the grid.
2. Zwischen Antenne und Batterien bzw. Telephon und Batterien entsteht eine EMK, welche in ähnlicher Weise an das Audiongitter gelängt.2. An EMF is created between the antenna and the batteries or the telephone and the batteries, which is extended to the audio grid in a similar way.
Um den Empfänger gegen die beschriebenen Störungen zu schützen, ist es demnach notwendig, sämtliche nach außen führenden Leitungen gegen kurze Wellen zu verdrossein (Abb. 2). Dabei ist es wichtig, die Kondensatoren der Drosselglieder an einen Punkt des Gehäuses zu legen, da sonst Gehäuseströme entstehen, die durch Ohmsche, kapazitiveIn order to protect the receiver against the disturbances described, it is accordingly necessary to throttle all lines leading to the outside against short waves (Fig. 2). It is important to connect the capacitors of the choke elements to one point of the The housing, otherwise the housing currents are created by ohmic, capacitive
40. oder induktive Kopplungen Störspannungen am Gitter des Audions erzeugen.40. or inductive couplings generate interference voltages on the grating of the audion.
Mit den beschriebenen Mitteln ist es möglich, die Störungen durch den Kurzwellensender weitgehend herabzusetzen.With the means described, it is possible to eliminate the interference from the shortwave transmitter largely reduce.
Sind die Störungen zu stark, so genügen *5 auch die beschriebenen Mittel noch nich+. einen brauchbaren Empfang zu gewährleisten: Eine völlige Beseitigung der Störungen erzielt man dann selbst bei ungünstigen Fällen, wenn man zusätzlich in die Audiongitterleitung so eine Hochfrequenzdrossel legt und gleichzeitig einen Teil der Abstimmkapazität direkt zwischen Gitter und Faden legt, so daß Störspannungen, die unmittelbar im Schwingungskreis liegen, nicht an das Gitter gelangen (Abb. 3). Die Hochfrequenzdrossel muß so dimensioniert werden, daß sie den Empfang im Langwellengebiet nicht verhindert. Dazu ist lediglich erforderlich, daß die Eigenwelle aus Selbstinduktion der Drossel und der direkt zwischen Gitter-Faden liegenden Kapazität wesentlich kleiner ist als die kleinste Abstimmwelle.If the defects can be strong, so suffice * 5, the agents described still non +. To ensure a usable reception: A complete elimination of the interference is achieved even in the most unfavorable cases, if you also place a high-frequency choke in the audio grid line and at the same time place part of the tuning capacitance directly between the grid and the thread, so that interference voltages that are directly in the oscillation circuit do not reach the grille (Fig. 3). The high-frequency choke must be dimensioned so that it does not prevent reception in the long-wave range. For this it is only necessary that the natural wave from the self-induction of the choke and the capacitance lying directly between the grid threads is significantly smaller than the smallest tuning wave.
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE554400T | 1930-06-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE554400C true DE554400C (en) | 1932-07-07 |
Family
ID=34558996
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1930554400D Expired DE554400C (en) | 1930-06-01 | 1930-06-01 | Device for the interference-free reception of long waves in the vicinity of a short-wave transmitter |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE554400C (en) |
GB (1) | GB374621A (en) |
-
1930
- 1930-06-01 DE DE1930554400D patent/DE554400C/en not_active Expired
-
1931
- 1931-06-01 GB GB1598931A patent/GB374621A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB374621A (en) | 1932-06-16 |
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