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Trim RFID card

Posted: Tue May 14, 2019 10:41 am
by GordStewart
I've bee putting those small RFID cards for charge networks like chargepoint and koben systems on a key ring. I recently received one from FLO that's credit card sized. Can I cut this safely without damaging the antenna or chip?

Re: Trim RFID card

Posted: Tue May 14, 2019 1:05 pm
by alozzy
Very unlikely. If you do a Google Images search for "inside rfid card", you'll see what I mean...

Re: Trim RFID card

Posted: Tue May 14, 2019 1:50 pm
by goldbrick
+1. Size matters for antennae and I'd bet there is an antenna around the perimeter of the card. Any trimming of the card would cut that and render it useless.

Re: Trim RFID card

Posted: Tue May 14, 2019 2:00 pm
by mwalsh
Depending on the color of the card, you can sometimes hold them against the flashlight on your phone (or other high-density light) and see the contents. Doesn't work so well with dark colored cards but works great for light colored ones. It's how I typically check before hole-punching cruise line cards for a lanyard.

Re: Trim RFID card

Posted: Tue May 14, 2019 5:39 pm
by jjeff
I successfully trimmed about a centimeter off all edges of a work CC sized RFID card so it would fit in a key lockbox but I don't know how much more I could have cut off and still had it work.....

Re: Trim RFID card

Posted: Fri Sep 27, 2019 12:11 pm
by bobkart
The most I've done is drill a hole so I could attach it to a key-ring holding all my other charging cards.

I used the light approach mentioned above to help avoid the antenna traces when I drilled. The traces did look to be typically near the outer edge of the card, so I had to position my hole somewhat more to the inside than I would have preferred.