Cart (Loading....) | Create Account
Close category search window

Developments in h.f. direction-finder shore stations using Adcock aerials

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $31
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)

High-frequency direction-finders (operating on a frequency band of 1.5 to 30 Mc/s) have been used extensively during the war for shore station d.f. networks. The aerial system employed has been almost exclusively the buried-U Adcock type. The main considerations for using this type of aerial system were as follows:- (a) Small polarization error. (b) Wide frequency-band coverage. (c) Adequate sensitivity. (d) Suitability for use either with radiogoniometers or cathode-ray type direction-finders for rapid bearing indication. The main developments in h.f. direction-finding have been in the reduction of polarization error by the use of earth screens, and an attempt to reduce phase interference effects by ray-separation technique. Improved methods have also been devised for aerial balancing and for compensating for instrumental irregularities. In this connection an internal injection method has been developed for checking the overall balance of aerials, feeders and radiogoniometers, especially for use on sites where an external local calibrating transmitter is unreliable. Attention has been paid to improvements in design of radiogoniometers, and instruments have been developed for injecting calibrated voltage ratios into the field coils for laboratory checks of instrumental performance. A special type of local calibrating transmitter has been developed which employ frequency modulation for rapid local calibration checks and more especially for sense circuit calibrations. This has proved extremely useful in detecting minute aerial irregularities occurring over narrow frequency bands. An investigation has been carried out into the operational performance of various d.f. systems on all classes of traffic. A comparison has been made of the merits of visual and aural presentation and their effect on accuracy, speed of operation, flexibility and simplicity of maintenance. The advantages of group station working are discussed, and finally a type of instrument is described the d- esign of which is based on the results of operational statistics.

Published in:

Electrical Engineers - Part IIIA: Radiocommunication, Journal of the Institution of  (Volume:94 ,  Issue: 15 )

Date of Publication:

March-April 1947

Need Help?

IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.