AT152487B - Arrangement for balancing the air-core coils in multi-circuit receivers. - Google Patents
Arrangement for balancing the air-core coils in multi-circuit receivers.Info
- Publication number
- AT152487B AT152487B AT152487DA AT152487B AT 152487 B AT152487 B AT 152487B AT 152487D A AT152487D A AT 152487DA AT 152487 B AT152487 B AT 152487B
- Authority
- AT
- Austria
- Prior art keywords
- arrangement
- balancing
- air
- core coils
- coils
- Prior art date
Links
Landscapes
- Coils Or Transformers For Communication (AREA)
Description
<Desc/Clms Page number 1>
Anordnung zum Abgleich der Luftspulen in mehrkreisigen Empfangsgeräten.
Vorliegende Erfindung bezieht sich auf den Abgleich von Hochfrequenzspulen. Zum Abgleich von Selbstinduktionen, insbesondere in mehrkreisigen Radioempfängern, ist es bereits bekannt, den
Einfluss von Kupferscheiben, welche den abzugleichenden Selbstinduktiol1sspulen mehr oder minder genähert werden, zu benutzen. Die in der Kupferscheibe auftretenden Induktionsströme wirken dem magnetischen Feld der Selbstinduktion mehr oder minder entgegen, so dass durch Verschieben derselben sich eine Veränderung der Selbstinduktivität einer Spule bewirken lässt. Das Verschieben von Kupfer- scheiben bringt jedoch besonders bei hohen Frequenzen zusätzliche Verluste mit sich, die unter Um- ständen störend sein können.
Erfindungsgemäss wird der Abgleich der Selbstinduktion von Luftspulen durch Heranbringen eines geeigneten ferromagnetischen Massekörpers bewirkt. Unter Massekörper ist im nachfolgenden durch ein Bindungsmaterial zusammengehaltenes feinstes Eisenpulver zu verstehen. In der Praxis stellt man beispielsweise derartige Körper so her, dass man das fein verteilte Eisen mit dem Binde- mittel auf einen festen Träger aufbringt. Zweckmässigerweise geschieht die Regelung in der Weise, dass eine so hergestellte Scheibe der abzugleichenden Spule mehr oder minder genähert wird. Der
Vorteil einer solchen Anordnung besteht darin, dass sich-verglichen mit der Verwendung von Kupfer- scheiben zum Abgleich - keine Dämpfungserscheinungen ergeben.
Bei Anwendung einer Kupfer- scheibe als Abgleichmittel nahm bei 15% iger Veränderung der Selbstinduktion die Gesamtdämpfung der Anordnung um etwa + 30% zu. Bei Anwendung einer Scheibe mit fein verteiltem Eisen zur
Herbeiführung der Änderung der Selbstinduktivität war eine Abnahme der Gesamtdämpfung von - 12% vorhanden.
PATENT-ANSPRÜCHE :
1. Anordnung zum Abgleich der Luftspulen in mehrkreisigen Empfangsgeräten, dadurch gekenn- zeichnet, dass nahe den abzugleichenden Spulen ein Massekernkörper näherbar angeordnet ist.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Arrangement for balancing the air coils in multi-circuit receivers.
The present invention relates to the trimming of radio frequency coils. For the adjustment of self-inductions, especially in multi-circuit radio receivers, it is already known to
Influence of copper washers, which are more or less approximated to the self-inductance coils to be adjusted. The induction currents occurring in the copper disk counteract the magnetic field of the self-induction to a greater or lesser extent, so that a change in the self-inductance of a coil can be brought about by moving it. Moving copper disks, however, leads to additional losses, especially at high frequencies, which can be disruptive under certain circumstances.
According to the invention, the self-induction of air-core coils is adjusted by bringing a suitable ferromagnetic mass body. In the following, mass body is understood to mean extremely fine iron powder held together by a binding material. In practice, for example, bodies of this type are produced by applying the finely divided iron with the binding agent to a solid support. The regulation is expediently carried out in such a way that a disk produced in this way is more or less approximated to the coil to be adjusted. The
The advantage of such an arrangement is that - compared with the use of copper disks for adjustment - there are no attenuation phenomena.
When a copper disk was used as a balancing agent, with a 15% change in self-induction, the overall damping of the arrangement increased by about + 30%. When using a disc with finely divided iron for
As a result of the change in self-inductance, there was a decrease in total attenuation of -12%.
PATENT CLAIMS:
1. Arrangement for balancing the air-core coils in multi-circuit receiving devices, characterized in that a mass core body is arranged near the coils to be balanced.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE152487T | 1933-04-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT152487B true AT152487B (en) | 1938-02-10 |
Family
ID=29412146
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT152487D AT152487B (en) | 1933-04-25 | 1934-02-17 | Arrangement for balancing the air-core coils in multi-circuit receivers. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT152487B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1197517B (en) * | 1961-03-14 | 1965-07-29 | Telefunken Patent | Matching device |
-
1934
- 1934-02-17 AT AT152487D patent/AT152487B/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1197517B (en) * | 1961-03-14 | 1965-07-29 | Telefunken Patent | Matching device |
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