Target the gate, get quite close (within about a ship-length) and shoot around where the turrets are. It only takes a shot or two (I'm not sure anymore because I have a bunch of class 10 weapons) then you'll see the health drop.
It regens after about 30 seconds so you have to shoot it again, but all traffic will stop while it's down. You can be sure that the gate stopped working when it flashes a white sparkle kinda like when you use it, but it's real fast.
.: Ryan "Blackguard" Shwayder
.: The GameWatchers Network
.:
http://www.gamewatchers.net/