My guess is it wouldn’t work. On a magnetic antenna, the number of turns don’t affect range, but they do affect the frequency to which the antenna is tuned. It needs to be tuned roughly to the frequency the protocol operates on, otherwise it won’t work.
In addition to that, these antennas also need to pick up power, which is also relative to the number of turns.
Seems like something to experiment with at some point. I do have access to test contactless card readers but not sure how they would feel about me destroying the test cards.
Only one way to find out, good thing that these don’t cost any money and you can just ask for a new one.
Maybe take some cash out first to cover any payments you may need to make it it breaks in some way.
If OP is using it and is happy with it, maybe one turn of wire is enough for it to still work, maybe with reduced range?
My guess is it wouldn’t work. On a magnetic antenna, the number of turns don’t affect range, but they do affect the frequency to which the antenna is tuned. It needs to be tuned roughly to the frequency the protocol operates on, otherwise it won’t work. In addition to that, these antennas also need to pick up power, which is also relative to the number of turns.
Seems like something to experiment with at some point. I do have access to test contactless card readers but not sure how they would feel about me destroying the test cards.