I've been keeping an eye on the CFMI HD transition, which as those in Vancouver have observed, has not been without teething. Corus moved CFMI and CFOX from the Selkirk/Rogers site on Mt Seymour to their old site which is about 1/3 the way down lower on the mountain which cost them coverage up the Fraser Valley. How this is going to flesh out with HD will be interesting to say the least.
On the CKNW sub channel, the levels are lower, and there's around 30 seconds of delay. I too have seen the random unlock occur both in North Delta and Richmond, both place have proper rooftop FM antennas, so it shouldn't be for lack of signal.
The big question is: are we only going to see them fill sub channels with their AM talkers or are they going to follow what's happening in the Seattle market: exclusive content (like KING, KJAQ, KUOW)? If it's just their ability to make CKNW sound better down town, there isn't going to be a rush by the masses to go out and buy a receiver and it's DAB all over again.
Now we also have the SCMOs that could be moved to sub channels or new ones created. The recent community stations in Surrey that broadcast religious programming could also be located on sub channels...
CBC in Vancouver has 5 FM stations in an already tight short spaced dial, 2 are class C's the other 3 probably class A's. Given that the Class C's could carry 3 additional channels each, that would allow them to transition the class C's to sub channels, and provide more services with an overall reduction of operational costs and better coverage than the class C's. How could CBC's brass not like this?