Key fob battery; spec and warning

[Bill AGT]

I had similar issue. It is a common complaint I believe. Either you should keep the Key fob at least 25 feet away or put it in a metal box or wrap it up in a tin foil, with that the two way communication is prevented and the battery does not dry out.

I have heard that wrapping in foil may act as an antennae, Just buy a faraday bag. Works great

 

[Bdr100]

I had similar issue. It is a common complaint I believe. Either you should keep the Key fob at least 25 feet away or put it in a metal box or wrap it up in a tin foil, with that the two way communication is prevented and the battery does not dry out.

Also, make a tin foil hat and where it whenever you drive gravity to ensure good key reception.

 

[Spaceiscoolright]

I have heard that wrapping in foil may act as an antennae, Just buy a faraday bag. Works great

I'm honestly curious with this question. Nothing about saying you're wrong, I don't have the answer, just trying to dumb down my thoughts on this. I also don't have problems with my key, so this is purely for curiosity.

Does a faraday bag actually work? My understanding is both the car and they key "say hi" via RF and when they both "say hi" together the car unlocks. The key has to be in some state of motion (as I put in my other comment in this thread about having to jiggle my pocket) for it to start "saying hi". So if you put it in a faraday bag, why does the key then not transmit? Wouldn't it just be "saying hi" into the void waiting for a response? Or does the car initiate the response from the key?

For additional context, I'm a physical touch engineer. If I can see it or picture it, I can understand it. RF has, and always will be, black magic to me. "The waves moves like this at this frequency." Sure they do pal show me.

 

[jered]

Does a faraday bag actually work? My understanding is both the car and they key "say hi" via RF and when they both "say hi" together the car unlocks. The key has to be in some state of motion (as I put in my other comment in this thread about having to jiggle my pocket) for it to start "saying hi". So if you put it in a faraday bag, why does the key then not transmit? Wouldn't it just be "saying hi" into the void waiting for a response? Or does the car initiate the response from the key?

You're pretty much spot on here, and without knowing more about this particular system it's hard to say that isolating the key does anything helpful (except if you keep your key too close to the car and it's constantly active, if that's the way it works at all).

It appears that, as a battery saving measure, the key has a micromechanical sensor so that the RF portion is off unless there's been recent motion. So, at least theoretically, a still key should have very little power drain and RF-isolation should not be necessary. (Unless it's constantly "listening", but that's not consistent with putting in a MEMS sensor to begin with.)

 

[prgarg]

Also, make a tin foil hat and where it whenever you drive gravity to ensure good key reception.

It'll also allow you to stream CINEMAX for free in your Gravity

 

[pjdcorp]

It'll also allow you to stream CINEMAX for free in your Gravity

But only if you buy the complete bundle with 6 other stations

 

[bicycleguy]

Does a faraday bag actually work? My understanding is both the car and they key "say hi" via RF and when they both "say hi" together the car unlocks. The key has to be in some state of motion (as I put in my other comment in this thread about having to jiggle my pocket) for it to start "saying hi". So if you put it in a faraday bag, why does the key then not transmit? Wouldn't it just be "saying hi" into the void waiting for a response? Or does the car initiate the response from the key?

I don't know who initiates the com but it doesn't really matter. Movement turns on the fob. The fob either or transmits or listens or both for a response to its id of interest for a set length of time. If it doesn't get a response soon enough or the response is too weak the fob shuts off.