How does force amplifier works?

What does Force Amplifier mod do to a portal?

I haven't found any info about it.. So maybe some people have tried and can share experiences?


Solution 1:

Force amp increases the force of portal attack (when you're attacking a portal)
rare:
1st = +2x

2nd = +0.5x > 2.5x
3rd = +0.25x > 2.75x ~ 2.8x
4th = +0.125x > 2.875x ~ 3.0x
example :
L6 portal without FA : base damage = 400 XM
with FA : base damage*2 = 800 XM

I don't know the numbers for very rare or common