GB1498026A - Radio receiving arrangements - Google Patents

Radio receiving arrangements

Info

Publication number
GB1498026A
GB1498026A GB1148174A GB1148174A GB1498026A GB 1498026 A GB1498026 A GB 1498026A GB 1148174 A GB1148174 A GB 1148174A GB 1148174 A GB1148174 A GB 1148174A GB 1498026 A GB1498026 A GB 1498026A
Authority
GB
United Kingdom
Prior art keywords
homing
receiver
output
indicator
communications
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
GB1148174A
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.)
Allard Way Holdings Ltd
Original Assignee
Elliott Brothers London Ltd
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 Elliott Brothers London Ltd filed Critical Elliott Brothers London Ltd
Priority to GB1148174A priority Critical patent/GB1498026A/en
Priority to DE19742424414 priority patent/DE2424414A1/en
Publication of GB1498026A publication Critical patent/GB1498026A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

1498026 Direction finders ELLIOTT BROS (LONDON) Ltd 4 Dec 1974 [14 March 1974] 11481/74 Heading H4D The Specification describes a homing indicator receiver arrangement associated with a communications receiver which may be V.H.F., F.M. for use on, e.g. an aircraft, wherein the homing indicator RF and IF circuits are synchronized to the separate communications receiver RF and IF circuits using common local oscillators to drive the respective frequency changing circuits therein, the output from the homing indicator receiver being fed at IF to a mixer which acts as a synchronized detector and produces an output signal which is fed to a known homing indicator. The D.C. output from an AGC detector connected to the input of synchronous mixer is connected to one input of a D.C. comparator circuit along with the D.C. output signal of said mixer so that an output is produced to actuate an alarm circuit on detection of, e.g. lack of equality between these signals which would occur on the homing indicator receiver receiving a communications signal different to that received in the communications channel due to, for example a defect in the homing channel circuitry. As described, the communications receiver is connected to high gain antenna 1. Dipoles 5, 6, located symmetrically on the aircraft to have differing radiation patterns are connected alternately at low frequency by switch 7 to homing receiver 8. Mixing circuit 10, comprising two mixers which are switched in quadrature and have outputs full wave rectified and summed to define the phase of the low frequency homing signal, produces an output which is filtered at 12 at the switching frequency and applied to homing indicator 13 which may be a meter or an aural device. In another embodiment, the arrangement may receive A.M. communication signals. The arrangement allows the wider bandwidth required for homing detection to be provided while the narrower bandwidth of the communications receiver is retained.
GB1148174A 1974-03-14 1974-03-14 Radio receiving arrangements Expired GB1498026A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1148174A GB1498026A (en) 1974-03-14 1974-03-14 Radio receiving arrangements
DE19742424414 DE2424414A1 (en) 1974-03-14 1974-05-20 RADIO RECEPTION SWITCH

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1148174A GB1498026A (en) 1974-03-14 1974-03-14 Radio receiving arrangements

Publications (1)

Publication Number Publication Date
GB1498026A true GB1498026A (en) 1978-01-18

Family

ID=9987060

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1148174A Expired GB1498026A (en) 1974-03-14 1974-03-14 Radio receiving arrangements

Country Status (2)

Country Link
DE (1) DE2424414A1 (en)
GB (1) GB1498026A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4489327A (en) * 1981-03-24 1984-12-18 Racal Communications Equipment Limited Direction finding

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4489327A (en) * 1981-03-24 1984-12-18 Racal Communications Equipment Limited Direction finding

Also Published As

Publication number Publication date
DE2424414A1 (en) 1975-09-18

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19921204