Out of curiosity, are the Presto Reader sensitivity set by the individual transit agencies? On the TTC, the readers seem to take a bit to pick up a Presto card; as in I literally have to place it directly centred and in occassions having physically touch the card the reader. There has been a few times where I would walk by tap as I normal would but the reader doesn't pick up. Whereas on 905 buses, I can tap in the general vicinity of reader area and in a split second it is registered (in order words, walk and tap).
Really? I've found the TTC's bus/streetcar readers, and the ones fitted onto the turnstiles that look like the bus/streetcar readers, are ridiculously overpowered. I was once travelling with a female friend, she actually had a transfer because she was using tokens at the time and as she boarded an LFLRV her presto card was scanned through her purse and charged her a fare she had no intention of paying (as she already had a transfer from a token payment). I recall having been looking back in her direction at the time, her purse was close to but not touching the presto reader, so I'm amazed that it got her card at that distance
plus through her purse. They're way too strong. I've never seen anyone have trouble getting a read through a wallet or purse.
I've found second to those readers, the GO train readers are the next strongest, still
tend to work through wallets/purses. I don't ride 905 agencies with the 1st gen bus readers that often but from what I remember they're pretty good. Don't remember the old 1st gen TTC turnstile readers well enough at all.
The TTC fare gate readers, on the other hand, are horrendously underpowered and I certainly find it causes me slight difficulties/delays using the gates in addition to the delay with them opening once the card is read. None of my friends with cards in wallets/purses have ever even once gotten a successful read on a faregate without taking their card out first.
To your question, I don't
think the transit agencies set reader sensitivity, I think it's a matter of the hardware being used. The TTC and OCTranspo have the newer 2nd generation readers for their surface vehicles, the 905 agencies and GO have 1st generation equipment of slightly varying versions.