crxdelsol je napisal/-a:tole je tale "antenski trak" ane ?

fare je napisal/-a:Ja,fantje kdo je za naj se oglasi pa gremo skupaj h Skubicu, pa še kaki skupinski popust dobimo in je!

uros_p je napisal/-a:Mene to, da jih avtoindustrija danes ne vgrajuje ne prepriča, da so zaradi tega slabši. Namreč ta trak je skoraj 1x dražji od senzorjev, vemo pa, da se vse vrti okoli denarja. Poleg tega senzorji zagotovo delujejo zadovoljivo, zakaj potem preiti na trak? Jaz sicer vem, zakaj bi prešel na trak in sicer zato, ker ne potrebuje vrtanja v odbijač. To pa naredi lažjo montažo, in še pomembnejše - ne spremeni zunanje podobe avta, ker se zgleda nalepi na notranjo stran odbijača.

Torej, še vedno iščemo informacije iz prve roke o tem, kako se trak obnese v praksi....

uros_p je napisal/-a:Torej, še vedno iščemo informacije iz prve roke o tem, kako se trak obnese v praksi....

Electro-Magnetic

Electro-magnetic kits operate passively, like our eyes at dusk - minus the flashlight. They have a lower maximum range than the ultra-sonic variety, but they are also more sensitive up close. I like to think of the electro-magnetic type as being more of a true "park assist" system, while the ultra-sonic type is more of "an excuse not to look behind you when doing general reversing". One way to describe how the system works is that it takes a "picture" of what is directly behind the vehicle when the circuitry is initially activated. It assesses the situation and stores it in memory, saying "ok, this is what the norm is". Bike rack or no bike rack, the "picture" remains the norm until the next time you back up and activate the circuitry (during which time it reassesses the situation). Anything that changes while moving the car in reverse (or which enters the field when the car is stationary) is detected, and the range to the object is calculated using some magical procedure that I won't pretend to fully understand. Anything that is hanging off of the back of the vehicle like a bicycle that moves along with the vehicle (as long as it is at least 3cm away from the antenna strip) is ignored.

PROs: approximate 4" (10cm) minimum range ; completely invisible once installed (mounts to the inside of the bumper skin) ; no drilling of bumper required ; sensor antenna is protected by the bumper itself ; less susceptible to falling snow or heavy rain (range is reduced to only about 10-15cm, but at least it won't beep continuously all the time) ; CAN-bus compatible (note: ultra-sonic kit manufacturers do not state this, and if asked might respond with blank stares, but they may work in our cars) ; only detects objects moving with respect to the antenna field (meaning that bike racks can be left mounted or dismounted without causing false warnings) ; available in front (audio only) and rear (visual and audio) bumper versions

CONs: approximate 2.5 foot (75cm) maximum range ; antenna field "distorted" by any metal within 1.5" (3-4cm) of antenna strip ; can't be installed in vehicles with metal bumpers (or in those with metal crash bars under the bumper skin that is too close to the skin) ; used by few OEM auto manufacturers (draw your own conclusions about that)

The main differences between the two that are of interest here is that:

a) the electro-magnetic kit doesn't require drilling of the bumper, where ultra-sonic kits -- with the exception of the rather ugly surface-mount kits -- do, and

b) different minimum/maximum ranges of operation

The first point is important if you just don't feel comfortable drilling holes in your bumper. You may slip with the drill, or screw up and not get the sensors installed perfectly center, or in a line that isn't straight. Or you may want to remove them at some time -- leaving large holes that will require at least two large bumper stickers to cover up. The electro-magnetic kit requires no drilling of the bumper, so there's no fear of not doing a pristine installation. The kit is also easily transferable to another vehicle because the kit comes with a spare antenna (ie: you just leave the old one attached to the bumper and the next owner will be none the wiser).

The second point is the main one: range. You have to ask yourself this question: do I want a parking assist device that won't notify me until I'm within about 2.5 feet of an obstacle, yet is sensitive enough to tell the difference between 4" and 6"? Or do you want one that will scan outwards all the way to about 10 feet and warn you of children's toys or pedestrians behind you, but can't tell you the difference between 4" and 12" when you're trying to fit into that tiny parking space down in Little Italy when you've already looked everywhere for a spot and you're running late and your parents are gonna be pissed. Of course, there's nothing to stop you from installing a kit of each type -- maybe an audible ultra-sonic kit for long range and an visual electro-magnetic kit for pin-point accuracy.