i've noticed, when i have the repeater set with a PL, that i can open my repeater sometimes with a HT programed with no PL tones when in very close proximity to the repeater . . And it doesn't always happen.. I have also listened to other repeaters with PL's where someone talking on it claim they are operating with no PL's. So yea, good point but i don't know??? Possibly the sensitivity of his squelch?