4 ms·
That is probably a moderately-variable function of the power output and sensitivity/gain of the radio in the phone (and card) used. (A crowded subway in Japan w
by vy8vWJlco 13y ago
That is probably a moderately-variable function of the power output and sensitivity/gain of the radio in the phone (and card) used. (A crowded subway in Japan would probably be ideal conditions. :p) Other phones may have noticeably better range, or range might be increased by simply going out of spec using lower level RF controls (if lower level access is possible per-controller, since as I don't see anything about power control in the Android docs).
http://android.stackexchange.com/questions/5044/nfc-functionality-in-google-nexus-s http://android.stackexchange.com/questions/5044/nfc-function...
https://developer.android.com/guide/topics/connectivity/nfc/index.html https://developer.android.com/guide/topics/connectivity/nfc/...
- jrockway 13y agoA high-gain antenna at the NFC frequency (13.56MHz) would be about 11 meters wide and 6 meters long. This is probably why there isn't much long-distance NFC skimming going on. (If you're an ARRL member, there's a good article on building a 14MHz directional antenna at http://www.arrl.org/files/file/protected/Group/Members/Technology/tis/info/pdf/0107028.pdf http://www.arrl.org/files/file/protected/Group/Members/Techn.... It's big, and one resonant at 13.56MHz would be a little bit bigger. But it is something that's physically possible and would make for an interesting experiment.) Edit: Here's another idea (and the article is free): http://www.arrl.org/files/file/protected/Group/Members/Technology/tis/info/pdf/5501022.pdf http://www.arrl.org/files/file/protected/Group/Members/Techn...
- vy8vWJlco 13y agoEasily concealable in a floor or wall. :) (I jest.)