| New evidence on downed DC3 |
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 ESM receiver type APR5A, salvaged from the DC3: a who was shot down by a Soviet fighter in 1952, could very well be used to spy on signals at frequencies above 10 gigahertz.
New evidence now presented for signals intelligence equipment aboard the downed DC3 was more advanced than previously known. FRA is almost completed its own investigation.
ESM receiver type APR5A, salvaged from the DC3: a who was shot down by a
Soviet fighter in 1952, could very well be used to spy on signals at
frequencies above 10 gigahertz (trecentimetersbandet), the new Soviet
radar transmitter used.
It shows records from 1944 and 1945 from the American University Harvard Radio Research Lab, which was originally designed receiver APR5, these are now published on the site Signalspaning.se by a private individual. The Swedish plane had two APR5A receiver board, which was salvaged with the planet in 2004. New Technology avlojade November 30 last year, documents from the War Archives showing that recipients were likely to be further developed by Foa3, Defence Research Establishment Title 3. The variant known as APR-5M. With the help of APR5A or if it is hot APR5M could the crew of the DC3 intercept signals from including a new radar sight, as the Soviet Union in the early 1950s tested the board in Me 15-plane and operated at a frequency of 10 gigahertz. With the new sights were Soviet fighters to attack the Swedish aircraft in the darkness and bad weather. One could also reveal the enemy aircraft from the West that dropped down equipment and supplies to Western agents. To capture and measure the new Soviet radarsiktets carrier frequency was important for Sweden and the Western powers during the Cold War, because they worked with to build jammers. There were other new Soviet radar transmitters, including the ground stations. A large Soviet naval exercise took place also when the DC3 flew out from Bromma on the morning of June 13. But it was a stated goal for Sweden and Western intelligence services in 1951 and 1952 to measure the signals on the rise 10 gigahertz (trecentimetersbandet). The accident investigation from the armed forces in 2007 allegedly DC3: ans receiver only manages six gigahertz. Radar expert Staffan Gadd, head of research at FOI, Defence Research Establishment, made before Christmas their own tests on the variant APR5A in Linköping. Also they showed that the recipient could receive signals at the high frequency range. It was easy, says Staffan Gadd. FRA said in December that they welcome new knowledge on the subject. While maintaining one's earlier assessment that the DC3: ans receiver just reached 6 gigahertz. Since then, the FRA has worked with its own "mini-inquiry" in the subject. According to Anni Bolenius, CIO at FRA, wants to "bottom out a bit on this issue." The inquiry headed by retired FRA expert Olle Finnman, in collaboration with Staffan Gadd. It is said to be ready within the next few weeks. APR5 receiver was manufactured in the United States during World War II, when radar development was intense. It was sold later as surplus material from the warehouse in USA. It was further developed by the manufacturer and got a new faucet through which the toner at high frequencies could be mixed down to lower frequencies and then to be determined. One of the models was called APR5A. |
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