GB1046281A - Radio receiver incorporating a harmonic discriminator - Google Patents

Radio receiver incorporating a harmonic discriminator

Info

Publication number
GB1046281A
GB1046281A GB34964A GB34964A GB1046281A GB 1046281 A GB1046281 A GB 1046281A GB 34964 A GB34964 A GB 34964A GB 34964 A GB34964 A GB 34964A GB 1046281 A GB1046281 A GB 1046281A
Authority
GB
United Kingdom
Prior art keywords
harmonic
filters
frequency
range
discriminator
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
GB34964A
Inventor
Charles William Earp
Francis Giles Overbury
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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
Priority to FR733A priority Critical patent/FR87133E/fr
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB34964A priority patent/GB1046281A/en
Priority to DE1964ST023153 priority patent/DE1256275B/en
Publication of GB1046281A publication Critical patent/GB1046281A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
    • H03D3/14—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of semiconductor devices having more than two electrodes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/08—Systems for determining direction or position line
    • G01S1/38—Systems for determining direction or position line using comparison of [1] the phase of the envelope of the change of frequency, due to Doppler effect, of the signal transmitted by an antenna moving, or appearing to move, in a cyclic path with [2] the phase of a reference signal, the frequency of this reference signal being synchronised with that of the cyclic movement, or apparent cyclic movement, of the antenna

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

1,046,281. Radio navigation; harmonic frequency discriminators. STANDARD TELEPHONES & CABLES Ltd. Jan. 1, 1965 [Jan. 3, 1964], No. 349/64. Addition to 1,003,317. Headings H3A and H4D. The omni-range radio navigation system of Specification 1,003,317 is modified in that the receiver harmonic discriminator, which is required to produce the fifth harmonic (150 c/s.) of the 30 c/s. " bearing " signal frequency-modulated on to a 9960 c/s. carrier, comprises two sets 11, 12, 13 and 19, 21, 22 of parallel connected L-C filters to which the F.M. wave is applied. The filters are series resonant at different frequencies spaced according to a cosine law (but not sequentially) through the range of frequency swing of the carrier (9960Œ480 c/s.), Fig. 2, 3 (not shown). The outputs of the filter sets are rectified by oppositely poled diodes 15, 23 and combined by summing resistors 29, 31. As the input frequency cyclically sweeps the range (9960Œ480 c/s.) appropriate filters become operative in turn at equal intervals to produce an output signal, the tuning sequence of the filters being such that the rectified output at 32 is alternately positive and negative so that the fifth harmonic of the 30 c/s. input frequency modulating signal is derived. Transistor amplifiers may precede the rectifiers, Fig. 5 (not shown), and the filters may be parallel resonant.
GB34964A 1964-01-03 1964-01-03 Radio receiver incorporating a harmonic discriminator Expired GB1046281A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR733A FR87133E (en) 1964-01-03
GB34964A GB1046281A (en) 1964-01-03 1964-01-03 Radio receiver incorporating a harmonic discriminator
DE1964ST023153 DE1256275B (en) 1964-01-03 1964-12-30 Harmonic discriminator for radio navigation receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB34964A GB1046281A (en) 1964-01-03 1964-01-03 Radio receiver incorporating a harmonic discriminator

Publications (1)

Publication Number Publication Date
GB1046281A true GB1046281A (en) 1966-10-19

Family

ID=9702829

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34964A Expired GB1046281A (en) 1964-01-03 1964-01-03 Radio receiver incorporating a harmonic discriminator

Country Status (3)

Country Link
DE (1) DE1256275B (en)
FR (1) FR87133E (en)
GB (1) GB1046281A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2458943A1 (en) * 1979-06-05 1981-01-02 Victor Company Of Japan FREQUENCY MODULATED SIGNAL DEMODULATION CIRCUIT

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB412904A (en) * 1932-09-26 1934-07-05 Marconi Wireless Telegraph Co Improvements in or relating to modulated carrier wave communication systems
US2413913A (en) * 1942-10-29 1947-01-07 Rca Corp Frequency discriminator circuit
US2694143A (en) * 1948-11-12 1954-11-09 Torrence H Chambers Balanced phase detector
US2961613A (en) * 1956-01-19 1960-11-22 Hughes Aircraft Co Linear frequency discriminator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2458943A1 (en) * 1979-06-05 1981-01-02 Victor Company Of Japan FREQUENCY MODULATED SIGNAL DEMODULATION CIRCUIT

Also Published As

Publication number Publication date
DE1256275B (en) 1967-12-14
FR87133E (en)

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