AlanTilles said:
You couldn't be more wrong. 862.0125 MHz is an SMR transmit frequency.
And, prior to any rebanding, for good or ill, it corresponds to Motorola's "channel number 440". Post-rebanding, Motorola's "channel number 440" corresponds to frequency 851.025000 MHz.
This is likely why you've been "bashed" above. Your statements, while they may be correct in some contexts, really don't have anything to do with a scanner user's concerns. We don't care about any FCC rubbish. All we care about is mapping a channel number, as indicated on a Motorola 3600bps CC, to a receive frequency on our scanners.
Motorola's channel number 440 used to be 862.012500 MHz. Scanners use, for channels 0-719, the formula:
RxFreq = 851.012500 + (channel x .025000)
Since scanners work on non-rebanded systems, we must presume that this algorithm is correct. (Any Motorola documentation to the contrary is certainly welcome - FCC documentation is irrelevant in the current context).
With Motorola's rebanding implementation, Motorola's channel number 440 is now 851.025000 MHz. Per Motorola's own released info, the receive frequency for channels between 440 and 559 (inclusive) is now calculated by:
RxFreq = 851.025000 + ((channel - 440) x .025000)
Therefore, Motorola's channel number 440 "moved" from 862.012500 MHz (
851.012500 + (440 x .025000) = 862.012500) to 851.025000 MHz (
851.025000 + ((440-440) x .025000) = 851.025000).
There's really no debate. Scanners using the "old" algorithm on non-rebanded systems work fine. Motorola has released the above "new" algorithm to the public. A scanner configured to use that new algorithm "works" on a rebanded system.
At the risk of repeating myself again... whether a system's frequencies have moved down by 15 MHz, 10.9875 MHz, some other number, or not at all is irrelevant to the scanner user. All we care about is the
fact that Motorola's channel number 440 has moved from 862.012500 MHz down to 851.025000 MHz. We don't care that 862.012500 may not have been used prior to rebanding. We don't care about FCC "rules" or "orders". We care about,
and only about, how Motorola has actually implemented "rebanding" on their systems.
Of course, if you're willing and able to provide some implementation-specific documentation from Motorola that contradicts the above, such corrections would be more than welcome. We scanner users would certainly like to see more details. Until such information is provided, though, we must go with the information that has already been proven in the field.
