Printer Friendly

HEM: new exhibit.

The Historical Electronics Museum in Linthicum, MD, just around the corner from BWI Airport, has added a new exhibit, the AN/APQ-13. The story of the APQ-13 begins with the British development of the H2S radar in 1942. The British Bomber Command was losing nearly 200 aircraft a month. Apart from the enormous loss of men and material, it was also near the maximum aircraft production rate. By direction of Prime Minister Winston Churchill, the 10-cm radar was brought into production. In January 1943, the British Sterling and Halifax bombers were fitted with the H2S radars that provided a ground-mapping capability for both navigation and night bombing. The H2X system replaced the H2S radar. It used a shorter wavelength that gave a sharper picture. The US converted 50 B-24 Bombers into F-7 Pathfinder Aircraft equipped with the H2X radars. These aircraft recorded 1132 sorties during WWII. The H2X in production was called the AN/APS-15 and was a 3-cm radar. It was designed to see through clouds for bombing, as well as to serve as a navigation aid. During WWII, B-29s were equipped with the improved H2X radar called the AN/APQ-13, a ground-scanning radar developed by Bell, Western Electric, and MIT. The radome was carried on the aircraft belly between the bomb bays and was partially retractable. The radar operated at a frequency of 9,375 [+ or -] 45 megacycles and used a superheterodyne receiver. The radar was used for high-altitude area bombing, search, and navigation. Computation for bombing could be performed by an impact predictor. A range unit permitted a high degree of accuracy in locating beacons. In 1945 after a series of failures to build a modern heavy bomber, the Soviet Union's leadership decided to build a copy of the B-29. Several aircraft had made forced landings in Siberia after raids on Japan. The APQ-13 radar was also copied and was later code named "Cobalt" by NATO. In late 1945, the APQ-13 took on a new life when it was the first military radar converted to a domestic peacetime application as a storm-warning radar. About 30 systems were converted and installed on military bases. The CPS-9 replaced the APQ-13 in 1949. The history of the development, production, and application of ground-mapping radar continued after the APQ-13, but none have experienced the variation of air. craft, users, and applications experienced by the APQ-13.

COPYRIGHT 2003 Horizon House Publications, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2003 Gale, Cengage Learning. All rights reserved.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:AOC News; Historical Electronics Museum
Publication:Journal of Electronic Defense
Geographic Code:1U5MD
Date:Aug 1, 2003
Previous Article:Golden Gate Chapter news.
Next Article:Major Michael Fiszer, Polish Air Force (ret.): many soldiers have withstood the worst bombardments without panic. There was always the hope that the...

Terms of use | Privacy policy | Copyright © 2021 Farlex, Inc. | Feedback | For webmasters |