LG Velvet 5G
I tested read range by layering cards and paper on the back and trying to read through it.
3 cards = thickness of about 2 mm
at the 2mm thickness i get some reads but not great
i tried 2.5 mm and i got reads but very inconsistently. id move my hand around the same spot as before and it only read about 20% of the time or less. For consistent results id say 1.5mm is most ideal
reason for the inconsistency seems to be timing. i got out my x field detector and turns out that the phone sends 3 weak pulses and then 1 stronger one. pulses seem to be at an interval of .58 seconds measured with a stopwatch. even knowing that though, more than 1.5mm is very difficult
if there’s anyone making a spreadsheet of phones, here’s all the info:
Name: LG Velvet 5G
Carrier (if it matters): AT&T
Tested with: NExT
pulse pattern: 3 weak 1 strong
Pulse speed on home screen: 0.5 to 0.6 sec between pulses
pulse speed on taginfo: ~ 0.2 sec between pulses
does not check nfc when screen is off.
ideal max read range: 0 to ~1.5mm
absolute max range: ~2.4mm