Βι¶ΉΤΌΕΔ

Close menu

Research & Development

Abstract

This report presents the results of field strength measurements on u.h.f. transmissions on 495 Mc/s and 560 Mc/s over land paths at distances up to 294 miles (473 km). These measurements extended over a period of approximately three years and have been used in the preparation of field strength/distance curves for various percentages of the overall time.

The results are compared with the measurements at 180.4 Mc/s made over similar transmissions paths and reveal a significant dependence of field strength on frequency.

The measurements were used by Study Group V of the C.C.I.R. in the preparation of field strength curves for tropospheric propagation at distances beyond the horizon.

White Paper copyright

© Βι¶ΉΤΌΕΔ. All rights reserved. Except as provided below, no part of a White Paper may be reproduced in any material form (including photocopying or storing it in any medium by electronic means) without the prior written permission of Βι¶ΉΤΌΕΔ Research except in accordance with the provisions of the (UK) Copyright, Designs and Patents Act 1988.

The Βι¶ΉΤΌΕΔ grants permission to individuals and organisations to make copies of any White Paper as a complete document (including the copyright notice) for their own internal use. No copies may be published, distributed or made available to third parties whether by paper, electronic or other means without the Βι¶ΉΤΌΕΔ's prior written permission.