w4rat

I'm new at this so please excuse me if this is obvious and I don't get it. I've been working the 146.28/88 W4RAT repeater and it is coming in loud and clear. I also set up the 442.55/447.55 with the same PL 74.4 MHz as a CTCSS and as a + offset. When I key up 146.28 I get a beep when I'm done...