Does the sensor jammer fully upgraded keep you from appearing on the CNI when you run?
Also, what does upgrading the suppressor do exactly, is it some sort of counter for the
acoustic locator or can your enemy see you firing while you have a suppressor equiped if your close to them?
I don't think so. I use light armor and max my movement, and I can sprint up behind a group leaving a spawn and knife them all without anyone turning around. IDK about people with MDs though, there's so little around that it could have been that one odd guy that turned around simply noticed that the blue-dots behind him are turning grey one at a time...
ALs upgrades work on distance, not duration or effectivness. It takes two points on AL to get to SJ, so I throw that last point in and take a AL with me on my killing loadouts. I can pick up a weapon, silenced or not from across the map on suppresion, and it gives me more bullet warnings from greater distances. For the 2c required to take it, an AL is a good option if you've already upgraded your SJ.
Upgrading your supressor works two ways I think, possibly three. First, it'll fool ALs from closer distances. Second, it decreases the distance from which someone gets those grey arrows. Third, (not sure about this one) it changes the sound emitted by the host weapon, no combat value aside from different tone...
I mostly don't use a supressor aside from my pistol, and that's just to take up extra c. An SJ will cover you on the map anyways, so the only warnings you give them are from the grey/yellow/red arrows once I fire, and without the decreased accuracy from a supressor it's more likely to be a red arrow.
acoustic locator will track your movements from between 4 - 8 seconds depending on how much they/or you have invested into the 1st 3 spec ops skills (tracking skills or something like that i can't remember exactly). acoustic locator will pick you up even if you have a suppressor on unless you have the suppressor skills maxed and/or SJ skills maxed and as phantom said SJ w/ max skills makes you invisible.
edit: and in order for the AL to pick you up you have to be shooting your weapon.
you can have full movement and sprint speed if and only if you max out SJ skills, and for your 2nd question you will show up on the map if you have a SJ w/o a suppressor (when shooting) but will quickly disappear in 1 - 2 seconds but its enough for a vet player to find you and kill you.
spec ops skills
the first 3 spec ops skills (tracking duration) effect only acoustic locator and motion sensor (works with vehicle awareness skill as well).
acoustic locator skills yes they effect distance of hearing sorry if i didn't make that clear earlyer they also pick up people that have suppressors but with no suppressor skills .
suppressor skills as Mr_Moonster said they fool ALs also they increase accuracy very slightly not enough to make a big difference but enough so that you can take someone out at a decent range.
sensor jammer skills lvl 1 and 2 effect the speed in which you can run and lvl 3 adds the SJ ability to nearby squadmates i believe
motion sensor skills just add distance of sensing and lvl 3 gives the sensor info to nearby squadmates.
but a thing to note about MS is that SJ > MS so if someone has a SJ your MS is useless
and lastly not really related to this thread but ill put it in anyway the mine detector skills
lvl 1 gives you the ability to see mines claymores and AT mines also increases distance of detection
lvl 2 gives you the ability to crawl past mines w/o detonating them also increases distance of detection
lvl 3 gives you the ability to crouch past mines w/o detonating them also increases distance of detection
hope that helps :3
EVEN THOUGH: LV.3 SENSOR JAMMER (SJ) > LV.3 MOTION SENSOR (MS)
\/\/\/\/\/\/\/ Run long enough and LV.3 MS < LV.3 MS \/\/\/\/\/\/\/
****** IF YOU HAVE THE IMPROVED RUNNING SKILLS where you can run for a LONG time if you choose to run the entire time, you may be detected when running. BUT ONLY by players wearing LV.3 Motion Sensors. ******
This is a Fact, I've tested it myself with friends in other factions.