I'm not sure on the MXT 115, but my MXT90 can. I have to go to each channel and press,hold the scan button for a second or two. When I release the button the scan icon no longer appears on the display. When I scan frequencies it will jump those channels I've removed. Repeat the process to add channels back. I've found this isn't possible on theMXT275. My MXT 275 won't even scan repeater channels after they've been enabled. With the MXT400 it's capable, but only with the software.