Re: Fwd: Card Inserted/Removed when holding card near reader

On Sun, Mar 9, 2014 at 8:59 PM, Adam Miartuš <[email protected]> wrote:
> Hello everyone,

Hi =)

> I think I have a problem when holding card over card reader. If I leave card
> on reader in one sweet spot everything works as intended, but if I try to
> hold card in air in proximity of reader (as normal user would probably do)
> or if I leave card on reader but slightly moved away from sweet spot (like 2
> mm to side) pcscd logs report card being inserted and removed in
> approximately 0.5s intervals.
>
> I don't know if this is normal mode of operation or if it is a problem. I
> know it could be anything but maybe someone here had a similar problem
> before and will be able to help me.

It happens with most contactless readers, some readers can read cards
from 0 to 10cm, others from 0 to 3cm. Some readers can't read certain
cards when they are exactly over then too, it may depend on the type
of the card (type A,B,FeLiCa). Your reader hardware antenna may be
simply bad and can't read the card  if it's not in the expected
position. One of the best readers I have tested so far is the SCL010
which can read mifare cards up to 8cm of distance and with some
degrees of freedom. This is not related to pcsclite and you can expect
the same behavior in Windows.

> Regards,
> Adam
>

Best wishes,
Bruno

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