DE708519C - Gradually adjustable band filter - Google Patents
Gradually adjustable band filterInfo
- Publication number
- DE708519C DE708519C DESCH118921D DESC118921D DE708519C DE 708519 C DE708519 C DE 708519C DE SCH118921 D DESCH118921 D DE SCH118921D DE SC118921 D DESC118921 D DE SC118921D DE 708519 C DE708519 C DE 708519C
- Authority
- DE
- Germany
- Prior art keywords
- coils
- band filter
- filter according
- band
- center coil
- 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
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0153—Electrical filters; Controlling thereof
- H03H7/0161—Bandpass filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/09—Filters comprising mutual inductance
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1766—Parallel LC in series path
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
Stufenweise regelbares Bandfilter Die Erfindung betrifft ein aus induktiv gekoppelten Schwingungskreisen bestehendes, stufenweise regelbares Bandfilter, insbesondere für Rundfunkempfänger.Step-by-step adjustable band filter The invention relates to an inductive filter coupled oscillation circuits existing, step-wise adjustable band filter, in particular for radio receivers.
Für stufenweise regelbare Bandfilter sind schon Umschaltungen durch Zusetzen und Abschalten von Kapazitäten bekannt. Derartige Umschaltungen müssen aber an Punkten hohen Hochfrequenzputentials vorgenommen werden, wodurch unkontralliexbare Verstimmungen und Dämpfungserhähungein auftreten.Switches have already been made for step-by-step adjustable band filters Adding and disconnecting capacities known. Such switchings must but are made at points of high high-frequency potential, which makes them uncontrollable Detunings and increased attenuation occur.
Zur Vermeidung dieser Nachteile ist daher schon vorgeschlagen worden, eine Zusatzspule, die m einem der Schwingungskreise liegt, umzuschalten. Mit derartigen induktiven Umschaltungen lassen sich jedoch nur zwei verschiedene Bandbreiten einstellen. Auch ist es nachteilig, daß hierbei die Umschaltung in einem Schwingungskreis vorgenommen werden muß.To avoid these disadvantages, it has therefore already been proposed that to switch over an additional coil which is located in one of the oscillating circuits. With such However, inductive switching can only be set to two different bandwidths. It is also disadvantageous that the switchover is carried out in an oscillating circuit must become.
Es ist auch bereits bekannt, im gemeinsamen Magnetfeld zweier induktiv gekoppelter Schwingungskreise zum Zwecke der Änderung des Kopplungsgrades und damit der Bandbreite eine kurzschließbare Spule anzuordnen. Um die Verstimmung des Bandfilters bei der Umschaltung zu vermeiden, ist es weiter bekannt, zwei Zusatzspulen im Streufloß der Schwingkreisspulen anzuordnen, die bei ihrem Kurzschluß die bei der Öffnung der mittleren Spule entstehende Verstimmung ausgleichen.It is also already known to be inductive in the common magnetic field of two coupled oscillation circuits for the purpose of changing the degree of coupling and thus the bandwidth to arrange a short-circuited coil. About the detuning of the band filter To avoid switching over, it is also known to have two additional coils in the litter raft of the resonant circuit coils to be arranged when they are short-circuited when they open Compensate the detuning that arises in the middle coil.
Mit demselben Aufwand an Schaltmitteln werden nun gemäß der Erfindung dadurch viel weiter gehende Wirkungen erreicht und zugleich die oben geschilderten Nachteile vermieden, daß die Hauptspulenkopplung in mindestens einer der Schaltstellungen für breiteres Band- durch die Zusatzspulensch:altung unterstützt wird.With the same expenditure on switching means are now according to the invention thereby achieved much more far-reaching effects and at the same time those described above Disadvantages avoided that the main coil coupling in at least one of the switching positions for wider tape is supported by the additional coil switching.
Hierdurch wird mit einfachen Mitteln eine Verstimmung des Bandfilters
bei der Umschaltung verhindert. Die Windungszahl der Spulen ist in weiten Grenzen
frei wählbar und kann auch sehr klein gehalten werden.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DESCH118921D DE708519C (en) | 1939-07-25 | 1939-07-25 | Gradually adjustable band filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DESCH118921D DE708519C (en) | 1939-07-25 | 1939-07-25 | Gradually adjustable band filter |
Publications (1)
Publication Number | Publication Date |
---|---|
DE708519C true DE708519C (en) | 1941-07-23 |
Family
ID=7451085
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DESCH118921D Expired DE708519C (en) | 1939-07-25 | 1939-07-25 | Gradually adjustable band filter |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE708519C (en) |
-
1939
- 1939-07-25 DE DESCH118921D patent/DE708519C/en not_active Expired
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