Can't speak to 508/522... haven't messed with doing analog locals on a sat box. I know on the 921 if you scan in analog locals, it won't let you map down the Satellite locals. So, in your case, the LA locals will not be listed in the 2-69 channel range, they will be in their normal Sat channel range (probably something up in the 7000-8800 range). Anything listed in the 2-69 range will be analog channels and therefore not recordable... the HD channels will be in the 2-1, 4-1, etc range... and recordable on the 921.