US2223084A - High frequency system - Google Patents

High frequency system Download PDF

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Publication number
US2223084A
US2223084A US207758A US20775838A US2223084A US 2223084 A US2223084 A US 2223084A US 207758 A US207758 A US 207758A US 20775838 A US20775838 A US 20775838A US 2223084 A US2223084 A US 2223084A
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United States
Prior art keywords
circuits
frequency
high frequency
resonance
frequencies
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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.)
Expired - Lifetime
Application number
US207758A
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English (en)
Inventor
Wiessner Alfred
Hagen Wolfgang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
Priority date (The priority date 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 date listed.)
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Publication date
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Publication of US2223084A publication Critical patent/US2223084A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/08—Arrangements for combining channels

Definitions

  • the present invention relates to high frequency systems, and more particularly to an arrangement for receiving messages transmitted by means of high frequency carrier waves over cables.
  • Fig. 4 diagrammatically shows a coupling circuit according to the invention
  • Fig. 5 diagrammatically shows still a further modification.
  • the Fig. 1 illustrates a correspondingarrangementwhich comprises three resonance circuits I, 2 and 3 of the parallel type'and connected in series.
  • the high frequency supplied over the line is conveyed to these circuits over the transformer 4.
  • Each of the three resonance circuits I, 2 and 3 is tuned to one of the frequencies transmitted over the line and is connected to the succeeding portion of the receiving equipment in any suitable manner.
  • the received wave is derived across the resonance circuit tuned thereto. Since the other two resonance circuits are tuned to the incoming frequencies which are to be separated, these circuits will act as rejector, circuits so that a high quality selective effect willbe obtained.
  • the Fig. 2 illustrates afparticularly suitable embodiment according to the invention.
  • Three resonance circuits 5, 6 and 'I of the series type are used and connected in parallel with each other.
  • the high frequency is derived from the above mentioned resonance means between the grounded point E and the notgrounded end of the inductance of the oscillatory circuits.
  • a switch 9 may, for instance, serve for connecting these circuits to the input side of the broadcasting receiver in.
  • the resonance circuit connected to the receiver acts as selective circuit while the two other circuits in parallel thereto act as by-pass circuits. characteristic impedance of the line is matched to the resonance circuits by means of the repeater 4.
  • the arrangement shown in the drawing may be used as an additional member to a standard broadcasting receiver, for instance, by providing the arrangement in a suitable box. It is also possible to utilize this arrangement as an input circuit for a specific wire-radio receiver in which the tuning circuits are directly connected to the first amplifying tube.
  • the resonance circuits may be correspondingly tuned to the new frequency by means of an adjustment of the condenser forming part of the circuit.
  • the Fig. 3 illustrates the resonance curves of the filtering circuits shown in Figs. 1 and 2. Investigations have proven that, e. g., on using three frequencies of 150, 180 and 220 kilocycles differences prevail with respect to the sharpness of the resonance curves since the width increases at the higher frequencies. equal curves forthese three frequencies, a requirement which is necessary for matching the low-frequency portion, it is possible to insert additional ohmic resistances in one or more of the resonance circuits as shown by resistances 2i and 22 in Fig. 5 which is later described in detail ⁇ or to correspondingly dimension the inductance to capacity ratio.
  • the higher frequency range of the low-frequency band transmitted by the agency of the carrier frequencies are generally attenuated due to the shape of the resonance curve as shown in Fig. 3.
  • a coupling device is provided in one of the low-frequency stages as illustrated in Fig; 4.
  • This figure shows a typical low frequency amplifier tube I 2.
  • low frequency is meant a frequency which is of a different and lower order from the frequency of the'wave received over the line.
  • the tube I2 may represent a conventional audio frequency amplifier tube which follows the frequency.
  • FIG. 5 Still another embodiment according to the invention is shown in Fig. 5 according to which a selective action corresponding to that shown in Fig. 2 is accomplished in the three parallel tuning circuits H in front of the first tube I6, while a further selective action iseffected in the three
  • serially arranged resonance circuits [9 in front of the second tube I8 which may be a tube of a detector stage.
  • the output of tube I8 is coupled by means of condenser 23 and resistance 24 to a low frequency portion of the type shown in Fig. 4.
  • the inductance coils of the resonance members of the three serially connected selective circuits l9 are simultaneously employed as primary windings of repeaters 20 which serve as coupling to the succeeding amplifying stage. Cores of high frequency iron may be used in these repeaters in case of need.
  • the individual circuits may be conjointly adjusted, e. g., by means of a knob common thereto.
  • the resonance circuits of the various stages may furthermore be somewhat de-tuned relative to one another so as to obtain a band filtering effect for each of the three frequency ranges.
  • a receiving device for messages transmitted over cables by means of high frequency carrier waves said de-. vice comprising an incoming line, a number of oscillatory circuits arranged in stages and having inductances and capacities one of said stages including oscillatory circuits connected in series and a further one of said-stages including oscillatory circuits connected in parallel to one another, a low-frequency portion having coupling means and being coupled to said stages, means for selectively rendering oneof said oscillatory circuits of each stage efiective as a selective circuit and simultaneously rendering the remainder of saidseri'es oscillatory circuits effective as rejector cir-- cuits and the remainder of said paralleloscilla tory circuits effective as by-pa ss circuits, andresistances included in' the individual oscillatory circuits and adapted to provide equal resonance characteristics for all oscillatory circuits.
  • said coupling means of said low-frequency portion being dimensioned so as to compensate distortionsset up in the rejector and by-pass

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Amplifiers (AREA)
  • Filters And Equalizers (AREA)
US207758A 1937-05-20 1938-05-13 High frequency system Expired - Lifetime US2223084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2223084X 1937-05-20

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US2223084A true US2223084A (en) 1940-11-26

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US207758A Expired - Lifetime US2223084A (en) 1937-05-20 1938-05-13 High frequency system

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US (1) US2223084A (fr)
BE (1) BE428168A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2611895A (en) * 1948-12-08 1952-09-23 Lacey Edward Multiplex antenna distribution system
US2628312A (en) * 1949-05-24 1953-02-10 Rca Corp Receiving station antenna distribution system
US2698360A (en) * 1949-07-11 1954-12-28 Seybold Rene Means for controlling the tone quality and tone volume of electrical musical instruments

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2611895A (en) * 1948-12-08 1952-09-23 Lacey Edward Multiplex antenna distribution system
US2628312A (en) * 1949-05-24 1953-02-10 Rca Corp Receiving station antenna distribution system
US2698360A (en) * 1949-07-11 1954-12-28 Seybold Rene Means for controlling the tone quality and tone volume of electrical musical instruments

Also Published As

Publication number Publication date
BE428168A (fr)

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