US2290959A - Radio receiving system - Google Patents

Radio receiving system Download PDF

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Publication number
US2290959A
US2290959A US387671A US38767141A US2290959A US 2290959 A US2290959 A US 2290959A US 387671 A US387671 A US 387671A US 38767141 A US38767141 A US 38767141A US 2290959 A US2290959 A US 2290959A
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US
United States
Prior art keywords
voltage
receivers
receiver
receiving system
radio receiving
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 - Lifetime
Application number
US387671A
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English (en)
Inventor
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.)
Filing date
Publication date
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2290959A publication Critical patent/US2290959A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/61—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast
    • H04H20/63—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast to plural spots in a confined site, e.g. MATV [Master Antenna Television]
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude
    • H03G11/02—Limiting amplitude; Limiting rate of change of amplitude by means of diodes
    • 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
    • H03H7/48—Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source
    • H03H7/482—Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source particularly adapted for use in common antenna systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
    • H04B15/06—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder by local oscillators of receivers

Definitions

  • This invention relates to radio systems in which broadcast or wired radio receivers have a supply equipment common to them, namely, a receiving antenna or a wired radio sender, respectively.
  • Receivers so arranged require to be provided with a neutralizing arrangement intended to prevent disturbances, such as reaction singing, which may arise in any one of the receivers, from acting on the other receivers.
  • This neutralizing arrangement should be such as to minimize the attenuation it exerts upon the useful energy arriving from the common antenna or the common radio sender, as the case may be.
  • Fig. 1 is a diagram showing a prior arrangement
  • Fig. 2 is a diagram representing an embodiment of the invention.
  • A denotes receivers of which only two are shown by rectangles.
  • the receivers A are joined to points a, b of the supply equipment over resistances Ra.
  • the loading resistance of the supply equipment is For obtaining the maximum efliciency the output resistance of the supply equipment must be made to approach the value Ra "5 so that The disturbing attenuation acting from a receiver on another hence corresponds to the value
  • the useful voltage at the supply equipment has been assumed to be to 20 mv., mv. being the symbol for millivolts, that is to say, the receiver is supplied with 5 to 10 mv.
  • the feedback voltage of one receiver may amount to about 2 v.
  • the disturbing voltage at the other receivers then amounts to It will thus be seen that the disturbing voltage is many times greater than the useful voltage.
  • the resistance of the supply equipment at Rs may be made small. This expedient, however, involves a great expenditure in transmitting power.
  • the attenuation of the disturbing voltage is increased by short-circuiting the disturbing receiver with the aid of a voltage-controlled resistance.
  • the voltagecontrolled resistances are here shown to be rectifiers G1, G2. These rectifiers are connected in parallel with the receivers A and are so chosen that with the incoming small useful voltage of about 10 mv. their resistance is high compared with Re. With increasing voltage the resistances become less and thus act to load the receiver increasingly. The rectifiers in this way absorb excess of power. In the event of feedback connection of a receiver, the rectifiers joined to this receiver decrease in resistance to such extent that the feedback voltage becomes ineffective so as not to disturb the other receivers. Th de mand upon the supply equipment at Rs is not augmented appreciably through the short-circuiting since the resistances Ra prevent short-circuiting of Rs. As will be understood from Fig.
  • Fig. 2 shows two rectifiers as limiting devices it is to be understood that any other suitable non-linear limiting resistances may be employed instead.
  • the aim should be to provide for a limiting action not efiective in the case of the incoming useful amplitude.
  • the limiting action should be such as to limit only the disturbing amplitude outgoing from a receiver or to prevent the receiver from being overmodulated by the disturbing voltage being too great.
  • a common source of high frequency signals for supplying all said receivers, and means to prevent the disturbances in one receiver from interfering with the normal reception of signals by the other receivers, the last-mentioned means comprising a voltage-dependent resistor in shunt to the input of each receiver, and an isolating resistor connected between each said voltagedependent resistor and said common source.
  • said voltage-dependent resistor comprises a pair of oppositely connected rectifiers which do not exert any substantial rectifying effect except at the relatively high level of said disturbances.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Air Bags (AREA)
US387671A 1940-03-13 1941-04-09 Radio receiving system Expired - Lifetime US2290959A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL0100356 1940-03-13

Publications (1)

Publication Number Publication Date
US2290959A true US2290959A (en) 1942-07-28

Family

ID=7289338

Family Applications (1)

Application Number Title Priority Date Filing Date
US387671A Expired - Lifetime US2290959A (en) 1940-03-13 1941-04-09 Radio receiving system

Country Status (4)

Country Link
US (1) US2290959A (enrdf_load_html_response)
CH (1) CH216837A (enrdf_load_html_response)
FR (1) FR870270A (enrdf_load_html_response)
NL (1) NL60037C (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404290A (en) * 1965-05-25 1968-10-01 Navy Usa Peak-to-peak intermediate frequency single control limiter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404290A (en) * 1965-05-25 1968-10-01 Navy Usa Peak-to-peak intermediate frequency single control limiter

Also Published As

Publication number Publication date
FR870270A (fr) 1942-03-06
NL60037C (enrdf_load_html_response)
CH216837A (de) 1941-09-15

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