GB1071221A - Equaliser for fm transmission systems - Google Patents

Equaliser for fm transmission systems

Info

Publication number
GB1071221A
GB1071221A GB5228565A GB5228565A GB1071221A GB 1071221 A GB1071221 A GB 1071221A GB 5228565 A GB5228565 A GB 5228565A GB 5228565 A GB5228565 A GB 5228565A GB 1071221 A GB1071221 A GB 1071221A
Authority
GB
United Kingdom
Prior art keywords
circuit
filter
equalizer
amplitude
modulation
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
Application number
GB5228565A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1071221A publication Critical patent/GB1071221A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/006—Angle modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/08—Modifications of modulator to linearise modulation, e.g. by feedback, and clearly applicable to more than one type of modulator
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/38—Angle modulation by converting amplitude modulation to angle modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/06—Limiters of angle-modulated signals; such limiters combined with discriminators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/165—Ground-based stations employing angle modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Filters And Equalizers (AREA)
  • Radio Relay Systems (AREA)

Abstract

1,071,221. Frequency modulation systems; radio signalling. INTERNATIONAL STANDARD ELECTRIC CORPORATION. Dec. 9, 1965 [Dec. 12, 1964]. No. 52285/65. Headings H3R and H4L. In a frequency modulation system, e.g. a repeater of a microwave transmission system, comprising a filter and a non-linear circuit element, the filter having a phase-frequency characteristic such as to produce amplitude modulation; an equalizer circuit is included between the filter and the non-linear circuit, and has an amplitude-frequency characteristic tending to oppose the amplitude modulation produced by the filter. In one example, Fig. 3 (not shown), the equalizer comprises a series tuned circuit (L1, C1, R1) and a parallel tuned circuit (L2, C2) coupled to the signal path through respective potentiometers (P1 and P2) which may be semi-conductors. An I.F. amplifier chain in a repeater may include a group-delay equalizer followed by an amplitudebroadener, which flattens out the amplitudefrequency characteristic of the I.F. amplifier, followed by the equalizer circuit described above which feeds an amplitude limiter followed by the last stage of the I.F. amplifier. The amplitude limiter would convert any amplitude modulation into phase modulation, but the former is eliminated by the equalizer circuit.
GB5228565A 1964-12-12 1965-12-09 Equaliser for fm transmission systems Expired GB1071221A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1964ST023074 DE1254718B (en) 1964-12-12 1964-12-12 Equalizer for FM broadband radio relay systems

Publications (1)

Publication Number Publication Date
GB1071221A true GB1071221A (en) 1967-06-07

Family

ID=7459612

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5228565A Expired GB1071221A (en) 1964-12-12 1965-12-09 Equaliser for fm transmission systems

Country Status (5)

Country Link
BE (1) BE673620A (en)
CH (1) CH441449A (en)
DE (1) DE1254718B (en)
GB (1) GB1071221A (en)
NL (1) NL6516145A (en)

Also Published As

Publication number Publication date
DE1254718B (en) 1967-11-23
NL6516145A (en) 1966-06-13
CH441449A (en) 1967-08-15
BE673620A (en) 1966-06-13

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