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Also, I'm not sure I'm understanding what the dates for Wave 1 represent. Are those just the business-and-paper end of things? If somebody has more info, ...
As with many (most?) government programs, there have been many delays, so the dates on that site are out of date. While Portland has changed all their 851-854MHz freqs. to the 854-860 band, other licensees in the 851-854 band have not finished relocating, thus the 866-868MHz freqs. have not been changed yet. Here's how the whole thing is supposed to work.
After the 851-854MHz band has been cleared, the 866-868MHz freqs. will all be changed by subtracting 15MHz. Thus, 866.0250 will become 851.0250.
That's where the real problem lies for older scanner users.
Most scanners do not use the exact freqs. to follow trunked conversations. They use the FCC Channel numbers that are sent over the control channel. They are 1-120 in the 851-854MHz band. 1=851.0125, 2=851.0375, 3=851.0625, etc. 120=853.9875. The spacing is .0250.
In the example above, 866.0250 became 851.0250. There is no channel number for that freq., so we expect the 0-120 channel numbers will be expanded to 240 channel numbers.
If the control channel tells your scanner to tune to channel 3 (now 851.0625), the freq. on channel 3 has been changed to 851.0375 and you won't hear anything. Older scanners will no longer be able to track Motorola trunked systems.
Some newer scanners can be re-flashed or the band plan can be changed. Most people don't know when this will all be completed.