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RFID Battery Cover for Evo SHift 4G
While I was using my Palm Pre, I undertook a little project. My problem at work: forgetting my RFID access card at home and having to call co-workers to let me in and out of the building. After a few times of doing this I decided that I needed a better way to carry that card so, I added the RFID antenna and chip to my Touchstone battery cover. I have never left my phone at home so I never left my access card!
Once I got my HTC EVO Shift 4G, the first thing I did was check the battery cover and found that it has a small area in the back cover that leaves space for something like this.
All it took was to move the RFID hardware into the new battery cover and it works right out of the box.
I've seen no signal loss as of yet but when adding a system like this into the phone, thats always in the back of my mind. I will report back when if I see an negative side effects.
The only hard part about doing this is removing the antenna and RFID chip from their original shell. From what I've seen, there are two types. My originial card was made in two parts. I used a sharp knife to pry apart the front and back halves of the card. Attached to the back half, I found the RFID hardware held in with glue spotted all around it. I gently removed the glue spots one at a time.
The other type of card takes more time and effort. If you have a credit card style RFID card, the antenna and chip are embedded in the plastic of that card and you will have to chemically "melt" it away. A small bowl of Acetone and a few minute bath for your card should do the trick. I haven't done this personally so.... ask a chemist before you try this.... or the internet, he might know.
I had the tape I was going to use to hold the hardware in place on my phone ready when I completely removed it from the card. When you do move the antenna and chip, it is very important to be careful. The chip is usually only held to the antenna with to very small wires. (I made this mistake twice before I got it right.) Once you get the chip and antenna set on some tape (electrical, scotch, doesn't matter) that should hold it together and hold those two small wires in place without much risk of breaking.
Once you get the antenna onto the tape to hold it all together, simple install it onto the battery cover. The card we use at my job holds a large antenna and chip so this should work for just about anyone who is willing to try it!!!