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Old 06-08-16, 12:57 PM   #1
Cpt-Maxim
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Default HMS Marulken Developer chats Part I & II

The 1st official developer chat from June 7, 2016
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Developer chat with HMS Marulken team- Einar & Oscar from Skvader Studios on the SUBSIM TeamSpeak server. Players and testers "ask me anything" "open town hall" discussing their experiences within the game, and current alpha 144 build bugs and future plans, features, design ideas. The next open chat will be announced here later.

Edit: The first post is now updated to contain links for the 2nd official developer chat from June 14, 2016
<-- Subsim channel
<-- Myvidcam channel
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Old 06-10-16, 08:59 AM   #2
Dowly
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Regarding submerged radio comms.

The Germans had the 'Goliath' system starting from 1943 that could send messages to submerged U-boats. Radio messages could not be sent from submerged boats, however.

The range was extremely long with one U-boat reporting receiving messages while it was in the Caribbean Sea.

Maybe something similar could be modeled in HMS Marulken? Submerged boats at either periscope depth or at the German maximum (I think it was max.) depth of 30 meters could receive radio messages?

Sources:
2.3. UNDERWATER RADIO COMMUNICATIONS IN WW2
http://uboat.net/articles/35.html

5. Use of very low frequency
https://www.ibiblio.org/hyperwar/ETO.../SRH025-8.html

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Old 06-10-16, 02:28 PM   #3
Cpt-Maxim
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This makes a great question for the next dev chat June 14th..
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Old 06-10-16, 11:18 PM   #4
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There is an absolute wealth of information about WW2-era sonar and underwater radio in this document from the US Navy Technical Mission to Japan. Although the focus is on Japanese technology and tactics, there is information about German and early-war British equipment too, the latter having been captured by the Japs at Singapore. There is also data of considerable general significance from Japanese research of the time.

Of particular note is that the Germans built a VLF transmitter in Japan (complementing their own transmitter in Germany) to assist communications between the two countries when shortwave transmissions were unreliable, and that this transmitter was used operationally for the submarine components of the Pearl Harbour attack. The German transmitter was reported to be received underwater off the South American coast.

The wavelength of over 7km means that a VLF transmitter requires an absolutely enormous antenna, which would be hard to build without official notice being taken. However, I note that Sweden already had extensive electrified railways by the late 1930s, and at least in theory, the overhead power wires could have been adapted into ersatz VLF antennas; it is usual to divide such equipment at roughly 10-15-mile intervals in order to distribute the traction load over the three phases of the power grid. A ten-mile section would make a great horizontal dipole on a 32km wavelength - about 10 kHz!

At such low frequencies it is necessary to use a very tight bandwidth (on both transmission and receiver), which necessitates a comparatively slow signalling rate. The modern applications of submerged VLF employ such low signalling rates (to ensure correct reception) that often all that can be sent is a single codeword, instructing the submarine to periscope depth to receive a longer message, or triggering some order previously detailed.
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Old 06-15-16, 04:38 AM   #5
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The first post is now updated to contain links for the 2nd official developer chat from June 14, 2016
<-- Subsim channel
<-- Myvidcam channel
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WWII Battleground Europe, Allied, - ts.wwiionline.com:9988
Elite Dangerous, Gamers Cove - 82.21.87.49
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