Which of the following could be the reason you are unable to access a repeater whose output you can hear?
Improper transceiver offset
You are using the wrong CTCSS tone
You are using the wrong DCS code
All these choices are correct✓Correct answer
Explanation
Hearing the output only proves the repeater is transmitting; getting into it also requires transmitting on the right input frequency with the right access code. A wrong offset, a wrong CTCSS tone and a wrong DCS code each break access on their own, so all three apply.