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1887

Some principles underlying the design of aerial systems for high-frequency radio direction-finders in H.M. ships

Some principles underlying the design of aerial systems for high-frequency radio direction-finders in H.M. ships

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Journal of the Institution of Electrical Engineers - Part III: Radio and Communication Engineering — Recommend this title to your library

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© The Institution of Electrical Engineers
Published

The paper deals with the design of direction-finding aerial systems to cover the whole of the h.f. band, to work on the ground wave and to meet the conditions peculiar to H.M. ships. The special problems encountered are intimately connected with the siting of the d.f. aerial. The aerial must be fitted to the top of a mast, and often at a considerable distance from the receiving compartment.The most satisfactory design of d.f. aerial to meet these conditions consists of two fixed crossed loops with an incorporated sense aerial, and a network for injecting test signals into the d.f. and sense-aerial circuits. The aerial system must be connected to the receiving apparatus by means of transmission lines which may be of considerable length.The paper describes the special problems experienced in achieving satisfactory performance in sensitivity, bearing accuracy and resolution of sense ambiguity, the compromises in design that have to be adopted and the performance figures obtained.

Inspec keywords: radio direction-finding; directive antennas

Subjects: Radionavigation and direction finding; Antennas

References

    1. 1)
      • C. Crampton , W. Struszynski , J.H. Marshall , J.C. Woolley . The Performance of High-Frequency Direction-Finders in Various Types of H.M. Ships. Journal I.E.E., Part IIIA
    2. 2)
      • R.E. Burgess . Reactance and Effective Height of Screened Loop Aerial. Wireless Engineer
    3. 3)
      • C. Crampton , R.T.P. Whipple , A.H. Mugridge . The Errors in Bearings of a High-Frequency Direction-Finder caused by Reradiation from a Nearby Vertical Mast. Journal I.E.E.
    4. 4)
      • L.L. Libby . Special Aspects of Balanced Shielded Loops. Proceedings of the Institute of Radio Engineers
    5. 5)
      • W. Struszynski , E.G. Robus , J.C. Woolley . An Instrument for Measuring the Resonant Frequency or Reradiating Structures. Journal I.E.E., Part IIIA
    6. 6)
      • Wright, C.S., Redgment, P.G., Struszynski, W., de Walden, S.: 30121/45, 1945, British Patent Application.
    7. 7)
      • S. De Walden , A.F.L. Rocke , J.O.G. Barrett , W.J. Pitts . The Development of a High-Frequency Cathode-Ray Direction-Finder for Naval Use. Journal I.E.E.
    8. 8)
      • A.T. Starr . (1938) , Electric Circuits and Wave Filters.
    9. 9)
      • W. Struszynski , J.H. Marshall . An Investigation of Symmetrical Screened Transformers for H.F. Radio Direction-Finders. Journal I.E.E., Part IIIA
    10. 10)
      • De Walden, S., and Swallow, J.C.: ‘The Relative Merits of Presentation of Bearings by Aural-Null and Twin-Channel Cathode-Ray Direction-Finders.’ (Not yet published.).
    11. 11)
      • Wright, C.S., Crampton, C., Struszynski, W.: 601096, 1948, British Patent Specification.
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