Are you sure you weren't hitting the repeater? Hearing a short burst of static (called the squelch tail) after un-keying the transmitter is normal, and a sign you have keyed up the repeater. Unless you have a second radio, with a good (I.e. well designed) receiver, to use as a monitor, all you will get is the squelch tail, and maybe that awful roger beep. However, not all repeaters have squelch tails. So, in that case, you would have no indication as to whether or not you had keyed the repeater. Also, if the repeater has been quiet for over 15 minutes or so, and you key it up, it should ID itself. Though, again, while generaly required, it does not always happen.