You can raise to radar depth and activate the SD antenna, and SJ if you have it, for the same functionality. But this is another shortcoming of the game. There are a total of 3 rise / lower controllers in the conn. Those are generally used for Attack Periscope, Observation Periscope and the SD Radar antenna in some mods. It could be used for the V-Class diving / surfacing periscope pre-war if desired. The FotRSU Team, during development decided it would be better to have the radars able to be turned on and off. The SJ was generally left as it was, other than it will turn on automatically such that if you are at radar depth, and a wave washes over your radar antenna, it will turn back on as soon as the "wave" clears. Once fully surfaced, the player can turn it off so as to minimize their electronic footprint. The SD antenna was done the same way. You can have it either Rise / Lower or On / Off. Not both, So we chose the On / Off with it defaulted to "Off" so that you can enter and leave the home port without having your TC interrupted by radar messages every 2 seconds by airplanes and ships.
