Thanks for the input Molon Labe.
I'm definitely doing something wrong then since I can't get the tsams launched from the 688i to be shot down. You said that it is important that the helicopter spots the missiles so as to give the frigate a chance to shoot down the subsonic missiles during the boost phase, is it sufficient to have it 10 miles out on the lookout for missile launches or should it be necessary to use the helicopter onboard radar as well ?