"Uboat 977 Accuracy" Topic
8 Posts
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Murvihill | 13 May 2016 7:08 a.m. PST |
I just finished the book by the captain of U977, written soon after the war from Argentina. I'm curious how accurate his statements were about the technical side of the uboat war from the Allied perspective, things that may not actually be true. For example, he said their radar detectors put out a signal that the Allied ships could detect. Thanks, Dave M. |
Onomarchos | 13 May 2016 9:03 a.m. PST |
Sounds suspect. A radar detector is a passive sensor. It does not emit any electromagnetic energy. Now, the mast that the detector is on could be picked up by radar. |
King Monkey | 13 May 2016 10:18 a.m. PST |
If he was writing soon after the war he wouldn't have known about the allies breaking the German codes and is probably trying to find reasons why they lost. |
PHGamer | 13 May 2016 1:16 p.m. PST |
According to the book, 20,000,000 tons Under the Sea, By Admiral Gallery, there was a signal the allies were able to detect at a short range. Whether a receiver or a transmitter, you still have to generate electro magnetic force of the frequency involved, or an intermittent frequency. Admittedly at a much lower power but it is created. |
Blutarski | 13 May 2016 7:29 p.m. PST |
The German author might unwittingly have been referring to the Allied HF/DF (High Frequency Direction Finding) system – a late war device able to detect high frequency radio transmissions at short ranges with a high degree of accuracy in bearing. IIRC, German U-boats employed high frequency radios in the belief that detection apparatus was too heavy and cumbersome to be carried aboard small escort vessels; the Allies were however able to produce an efficient lightweight system for shipboard use. B |
Pontius | 16 May 2016 2:39 a.m. PST |
I think the author was referring to the introduction of new higher frequency ASV radar in March 1943. RAF Coastal Command were using the new H2S radar operating on a wavelength of 9.7cm. Despite an experimental version of H2S being recovered from a Stirling bomber shot down over Holland at first they did not believe it in its use. In "Type VII U-boats" by Robert C. Stern I found the following:
"…the Germans fell prey to the most extraordinary delusion in an attempt to explain the rash of undetected attacks. The Germans had previously noted that the Metox and Grandin receivers were prone to overheating. Experiments now conducted by Gruppe West showed the FuMB 1 radiated. Gruppe West reports…Results exceed considerably the maximum range of Metox." A U-boat commander would be unlikely to know the facts and would remember the information provided by Gruppe West and BdU. |
Mobius | 18 May 2016 2:12 a.m. PST |
There are radar detector detectors now. link |
hagenthedwarf | 20 May 2016 5:37 a.m. PST |
I thought a captured pilot had hoodwinked his interrogators by suggesting they could home in on the detectors. |
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