Hmm, not behind the rear-view pillar then (effectively behind the mirror itself)? That's what I was going to try.
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We move our EZPass from car to car as well and usually just hold it up to the glass in our other cars as we go through.
Curious: could the transponder just be held up to the pano roof glass instead-- just skip the windshield tricks altogether?
I asked for the plate mounted transponder. Not taking any chances. In Mass, we are required to have a front plate as well.
I'm not telling you to do it, but I ran with no front plates on my cars in MA for many years and didn't have any problems/tickets. YMMV. Also, I feel the front plate destroys the look of the beautiful Model S. So I'm willing to run the risk and pay a $25 every other year, if/when that happens (and it never has for me), in exchange for not mounting a front plate. But that's just me.
Nope. The only glass it will go through is the rear window.
It also goes through the side windows, which isn't useful for EZPass (or equivalent), but is useful for my gated community.
Nowadays, I just open the window and hold it out. Not the best way as I almost dropped my transponder once.
EZPass boxes are Active transponder systems, analogous to Active RFID systems. These use self-powered RFID tags that continuously broadcast their own signal using a permanently sealed lithium battery.
Regardless of passive or active technology, at least for recent MS builds, the area immediately to the right of the autopilot camera (solid black area of glass) is the only place that passes RF reliably. But the if the antenna of the device is not oriented exactly to be in that "sweet spot," it won't work. The Southern California TCA FastTrak transponder, for example, is reported not to work well; I've found that orienting it is critical, and that's probably why people who just hold it near the windshield in that area still are finding it not working. But there will always be an orientation that works. It just takes some trial and error for your particular variant of these transponders.Thats may be correct. Continuous transmission is unlikely...but they are self powered which probably makes them less dependent on antenna orientation.
Regardless of passive or active technology, at least for recent MS builds, the area immediately to the right of the autopilot camera (solid black area of glass) is the only place that passes RF reliably. But the if the antenna of the device is not oriented exactly to be in that "sweet spot," it won't work. The Southern California TCA FastTrak transponder, for example, is reported not to work well; I've found that orienting it is critical, and that's probably why people who just hold it near the windshield in that area still are finding it not working. But there will always be an orientation that works. It just takes some trial and error for your particular variant of these transponders.
I do understand that some production runs of the MS had windshields with "dots" in this upper area that didn't pass RF no matter what. This seems to have been resolved in newer VINs.
Yeah, I have a end May/early June build 70D. Only black dots in a thin line around top of windshield and not much if any black area by camera. My work garage passive transponder does not work anywhere, tried it exhaustively for several minutes in just about every position. Sucks! Every day I have to now open the sunroof and hold it up or role down the window and reach way around outside towards center of windshield as much as possible. Not a huge pain but it will be more when its snowing/cold/etc.