You need to understand how tones work. When a radio or in this case the repeater has an input tone, it will squelch out any signal that does not have that tone. So, the repeater will ignore you unless your signal has that tone. When the repeater sends out a signal with a tone, you can still hear it when you use no tone at all. But you also hear all other signals. To squelch out all the other signals and just hear the repeater, use the repeaters output tone.