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Originally Posted by lurker_hlb3
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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Yep, and the reverse is true for when the submarine was preparing to dive:
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Diving procedure.
When the word "stand by to dive" is passed, the operator will perform the following operations:
1. Turn the transmitter plate variac to zero and turn the transmitter plate voltage switch off. 2. Lower the antenna mast.
3. Turn the power switch off.
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