74
Beyond the Basics
PL4 (plan 4)
: If the last three digits of frequencies are less
than 866.0000 and 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.
You can assign a fl eet map to Type I or Hybrid systems
scanned in control channel only mode by going into the
trunk programming mode. You can also program IDs, set
a delay, and all the other parameters for systems scanned
in this mode. You can then either search the system to
fi nd new IDs or you can program IDs into memory and
then scan them.
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 fi nding active
control channels (using search), and then programming
them for control channel operation only.
Remember that this feature only applies to Motorola 800
systems, that you do have to set the proper system type
(800 MHz of Type 1 or Type 2) and you do have to program
the control channel frequency into memory and identify the
frequency as trunked in the trunk programming mode.
disconnect tone detect option (end code)
When this function is disabled, the radio looks for squelch
before returning to the control channel instead of waiting for
the disconnect tone. Only in rare instances will you need to
adjust the default settings. The condition to return to control
channels depends on whether the signal is present or not.
Notes
Notes
