Spehro Pefhany wrote:
On Wed, 2 Sep 2015 00:25:27 -0700 (PDT), whit3rd
wrote:

On Tuesday, September 1, 2015 at 8:59:50 AM UTC-7, Tom Gardner wrote:
See ads for wallets that prevent skimming credit cards? Are those
considered Faraday cages?
It's easier than that. A credit-card sized chunk of brass or SS shim stock
in close proximity to the card (next to it) will greatly attenuate any interrogation
RF and load the 'antenna' so it doesn't respond. I just keep a business
card from an electrochemical machining outfit in the wallet next
to the RF-responding cards.

Great idea.. I think I have one or two of those kicking around from
trade shows.

Or, there are metal-case 'wallets', if you can tolerate extra silliness.

Or use the 'security edition' of the Bill of Rights..

https://www.youtube.com/watch?v=TBrdB7aNOY4

--sp


Aluminized mylar works as well. They give you a bag made of the stuff if
you have the EZ-Pass units. (also works real nice to tuck a company cell
phone in when you don't want to deal with the BS for a while.... or at
least I heard that somewhere, I would never have done that with the
companies cell phone....)

Need a source? Dollar stores sell a lot of aluminized mylar in balloon
form....