Originally Posted by loumaag
Mike, although the rebanding of Motorola system may be happening at the same time, what happened in Grundy Co. is not a result of the rebanding, that is called a shuffled band plan and is used to attempt to keep rogue radios off the system. This has nothing to do with rebanding.
Based on Motorola documentation (below), I don't think there are any real "shuffled" systems - at least none we have heard about. Here's my take on Custom Band Plans.
I think Grundy county may be using the Negative (descending order) band plan.
There seem to be several variations of Custom Band Plans and even within the variations.
In Clackamas county, Oregon we have to reverse the order of entering Lines 1 & 2. We need to enter Line 2 first, then Line 1 or it will not track.
POSITIVE (ascending order), denoted by a plus sign.
Some scanners can use only positive polarity plans. The channels in those plans are in ascending order.
NEGATIVE (descending order), denoted by a minus sign.
As far as I know, only Uniden scanners can accept this type that places the channels in descending order.
SHUFFLED (random order).
If the Motorola description, below, is correct, and they are using the common definition of shuffle, then no scanners can follow a shuffled band plan.
4.7 Shuffled Band Plan (quote from Motorola documentation)
Radios that have been upgraded to be Rebanding capable are also capable of supporting the Shuffled Band Plan. The Shuffled band plan is intended to help prevent unauthorized system monitoring and access on Shuffled Band Plan enabled systems. Shuffled Band Plan shuffles all trunking numbered-channels allowed in the band plan.
Note that Shuffled Band Plan can only be enabled by the Rebanding Capable CPS program with an appropriate Advanced System Key per Trunking System. This feature is designed and implemented for Motorola 3600 Type II Trunking systems.