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Is it correct?
How so? Historically? I don't know. Historically correct or not, i kind of like the mechanic.
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Its is Historically correct.
http://www.hnsa.org/doc/radar/part4.htm#pgSD-4
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Use of the SD radar before surfacing.
1. The power switch should he on for 10 minutes before using the set.
2. Raise the antenna mast while at periscope depth.
3. When depth decreases to a point at which the antenna is clear of the water (7 to 10 feet), turn on the transmitter plate high voltage switch.
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