GordStewart
Posts: 3
Joined: Sun Apr 03, 2016 6:25 pm
Delivery Date: 26 Mar 2016
Leaf Number: 304926

Trim RFID card

Tue May 14, 2019 10:41 am

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?

alozzy
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Delivery Date: 18 Jan 2017
Location: Vancouver, BC
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Re: Trim RFID card

Tue May 14, 2019 1:05 pm

Very unlikely. If you do a Google Images search for "inside rfid card", you'll see what I mean...
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goldbrick
Posts: 568
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

Re: Trim RFID card

Tue May 14, 2019 1:50 pm

+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.

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mwalsh
Posts: 9637
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Location: Garden Grove, CA

Re: Trim RFID card

Tue May 14, 2019 2:00 pm

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.
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jjeff
Posts: 1917
Joined: Wed Jan 13, 2016 9:10 am
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Location: MSP MN

Re: Trim RFID card

Tue May 14, 2019 5:39 pm

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.....
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2013 S w/QC purchased new
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bobkart
Posts: 74
Joined: Sat Dec 22, 2018 12:17 am
Delivery Date: 14 Dec 2018
Leaf Number: 307853
Location: Pacific Northwest

Re: Trim RFID card

Fri Sep 27, 2019 12:11 pm

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.
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