UV5XP.... However to get CHIRP to see the radio either in the 'Download from radio' or 'Upload to radio' ... with the cable plugged in to my PC or my MAC, the radio must me switched OFF...then as I select 'Download or upload' as I select 'OK' i must immediately switch ON my radio then CHIRP sees it and proceeds. If I try to 'Download or upload' with the radio already switched on I get the message 'The radio did not respond' as CHIRP cannot see it connected. Any suggestions? Thanks VE7ECJ