Posted by Mike Reublin on May 10, 2012; 11:54am URL: http://elecraft.85.s1.nabble.com/Key-Line-Interrupter-w-SteppIR-tp7545371p7546405.html
Not if you can curb your excitement long enough for the antenna to
finish tuning. IMHO the time is well spent listening before tromping the
footswitch anyway. I've never damaged my SteppIR that way.