Open doors first time with this one trick
I've said before, I think, that my external experience of these things, mainly in a building that's been demolished so I am not bang up to date, supports a belief that a fixed transmitter has to ping, the portable key bit has to pong, the transaction has to be completed while the ponger is extremely close to the pinger and they don't show you where the pinger is or when it is pinging. So...
One device - a time clock - required a disc glued to a stripeless card to be held to a particular spot on the clock for 1 full second. So that's what I did, but I glued the disc to my phone and photographed the time clock as well, afterwards, so that I could tell I'd done it - there was nothing to stop me forgetting.
On another, for doors - same building - I converted the keyring tag thing into a finger ring, by cutting off the rim of a bottle top I think then securely taping that to the tag bit. Then the technique was to walk towards the door while sweeping the ring hand at just the right speed past the pinger so that a ping happened somewhere within range and it unlocked the door, usually, before I walked into it.
Biting the hand that feeds IT
