This was on 10/6/2013 - late in the afternoon in the east coast about 4 pm. The station was working split 5 up and I did not realize it for about 5 minutes. The band cops were not telling to QSY. I was looking for callers 3 kC up but could not hear anything. I thought he was working simplex - but nnever returned my calls. I decided to search 5 up and lo - there were the callers. I immediately went to work splii and was able to work him with 500 watts.within a few calls.