correct, once davenport hd locals go online, the locals that are not yet hd (in this area maybe pbs?) will still be broadcast in their SD counterparts.. so 4,6,8,18,26 will probbably go online in HD (i hope) and pbs will still be broadcast on 24 and 36, but in SD. all will be on 77..
to clarify what i meant before though was, until the hd locals go online on 77, our SD davenport locals arent on 77 at all.. so if the installer had indeed installed a 1000.4 today for you, and removed your 1000.1 or 1000.2, you would have been without locals at all until they go online, hopefully nov 4th..