SirenMadness wrote:That wouldn't be much of a distinctive coded signal if only a portion of the rows have a muting mechanism, though that's what it looks like to me as well, unless they only showed a portion of the secondary stators for the sake of seeing the inner stator.
If you look at it closely, the upright bars block off the entire length of the stator openings. The red rings simply hold them in place and rotate them. If my theory is correct, of course.
Think of it as a siren with an inner and an outer stator. The inner one is just like the stator of any other siren, while the outer one rotates to cover the ports of the inner one. This effectively closes off the entire stator with a very small rotation, which could be done by a rotary solenoid or a small motor underneath the siren motor inside the housing. If removed, the outer stator would resemble two red rings supporting a circle of flat, upright bars.
Lex orandi, lex credendi, lex vivendi.