Radiotelegraph & Radiotelephone Codes, Prowords and Abbreviations
Radiotelegraph & Radiotelephone Codes, Prowords and Abbreviations

Author: John W Alcorn VK2JWA

Publisher: Lulu.com

Published: 2013-10-26

Total Pages: 238

ISBN-13: 1863844244

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What started out as a minor Project in 1987, blew out like the national debt so with all this accumulated info, it seemed worthwhile to produce the first book, here now is the Latest Online Edition. The sources and references have been many and varied and although the utmost care was taken, the Lists are far from complete and may contain errors. The original Codes etc were designed principally for marine use as this was the field in which radio was initially developed. The majority retain this influence but many have been modified and modernized to cover land and air applications. Technical terms have also varied as technology has changed however most abbreviations of the computer age have been omitted. These are specialist terms of that mode, not often encountered in telegraphy.

Pearl Harbor's Final Warning
Pearl Harbor's Final Warning

Author: Valarie J. Anderson

Publisher: Valarie J. Anderson, Voleander Press

Published: 2021-10-24

Total Pages: 823

ISBN-13: 1736706659

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On 7 December 1941, Washington sent a message to its Pacific outposts about a potential Japanese attack. All but Pearl Harbor received it in time to prepare. New information from the archives of George Street, District Manager of RCA-Honolulu, exposes the fatal flaws that resulted in the surprise attack. Operational snafus, collusion, and spies weave a web of misdirection that entangles George Street and his children in one of history's biggest mistakes. Pearl Harbor's Final Warning amends the historical record by presenting previously unpublished material, including the original copy of General Marshall's coded message.

by United States. Introduction to sonar
by United States. Introduction to sonar

Author: United States. Bureau of Naval Personnel

Publisher: Lulu.com

Published: 2018-09-29

Total Pages: 193

ISBN-13: 035912335X

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SONAR (sound navigation and ranging) systems have many similarities to RADAR and electro-optical systems. Again, detection is based on the propagation of waves between the target and detector. There are active sonar systems, where the wave propagates from the transmitter to the target and back to the receiver, analogous to pulse-echo radar. There are also passive sonar systems, where the target is the source of the energy which propagates to the receiver, analogous to passive infrared detection. Therefore, a great deal of what has been discussed about these systems will also apply to sonar. Sonar, however, differs fundamentally from radar and electro-optics because the energy is transferred by acoustics waves propagating in water. So we first begin by discussing the characteristics of acoustic waves.