Ok, so I guess this has probably already been answered somewhere, but in regards to Jamming fields is it:

a) a static effect, it's ability must be observed for all squadrons and I cannot trigger it on/off

b) as it is a upgrade card, can I trigger its effect when I want it to, for example when a tie attacks my Xwing, I trigger the jamming field, but when my Xwing attacks the tie fighter, I don't trigger it

in my mind, because all upgrade card effects are optional unless otherwise stated and Jamming fields doesn't say it must be treated as obstructed, I can toggle its effect on or off.

however I honestly have no clue so if somebody could clear up my confusion that would be appreciated

Errata from the FAQ:

Jamming Field

This upgrade card’s effect should read:

“While a squadron at distance 1–2 is attacking a squadron or defending against a squadon, the attack must be treated as obstructed.”

Yep, thanks a lot, was just going Way back in the rules forum and finally found it, thanks a lot

This was a major argument back in the day.....