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Control Channel Only Mode
When this function is activated, trunking is performed using control channel data only. Voice
channel (also known as "working channel") frequencies do not have to be programmed into
memory. When using this feature, the scanner will display "CC" and channel activity
indicator bars will not operate. This feature only applies to Motorola 800 MHz and 900 MHz
systems.
To turn this function on, choose Motorola Type-2 800 MHz or 900 MHz or TYPE 1 by
selecting TRUNK DATA - BANK NO. - TRUNK TYPE. Then set to the desired control plan
by selecting TRUNK DATA - BANK NO. - CTRL CH ONLY.
You must choose one of 4 frequency plans before you begin to Control Channel Trunk. Note
that the default, Plan 1, is the most common. Read the description of the Plans below for
details on which may apply for you.
PLAN 1: Use Plan 1 if the last three digits of ALL the frequencies in use end in one of the
following three digits: 125, 375, 625, or 875 (example: 865.1125, 865.7375, 865.6625,
866.8875).
PLAN 2: If the last three digits of frequencies less than 870.0000 end in one of the
following three digits (125, 375, 625, or 875) AND if ANY other frequencies end in (000,
250, 500, or 750) use Plan 2.
PLAN 3: If the last three digits of ALL the frequencies in use end in one of the following
three digits (000, 250, 500, or 750) use Plan 3.
PLAN 4: If the last three digits of frequencies less than 866.0000 end in one of the
following three digits (000, 250, 500, or 750) AND if ANY other frequencies end in (125,
375, 625, or 875) use Plan 4.
Of course you will know the Control Channel frequency itself so that will help you determine
the proper Plan. If you try one plan and you receive errors (such as the scanner jumping to
channels that are obviously not part of the system), you should try an alternate Plan.
Note: You can assign a fleet map to Type 1 or Hybrid systems scanned in Control
Channel only mode by going into the menu. You can also program IDs, set delays,
alpha tags and all the other parameters for systems scanned in this mode. You can
then either search the system to find new IDs or you can program IDs into memory
and then scan them.
Note: The Control Channel Only feature is an extremely powerful tool. You can use it to
determine if systems you are familiar with may have added new frequencies or you
can use it to discover new systems by simply finding active control channels (using
Search) and then programming them for Control Channel operation only.
Remember that this feature only applies to Motorola 800 and 900 MHz systems,
that you do have to set the menu for the proper system type (800 Type 1 or Type II
or 900 MHz) and you do have to program the control channel frequency into
memory and press and hold the TRUNK key to identify the frequency as trunked.
63


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