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Selecting TMO or DMO Operation
General
In Trunked Mode Operation (TMO) the MTP850 is used with
the infrastructure services within system coverage.
In Direct Mode Operation (DMO) the MTP850 is used without
infrastructure services required.
A MTP850 in DMO can communicate with the trunked
system (and vice-versa) through a gateway device. To use
that feature, please enable the gateway option in your
MTP850 (see “Gateway/Repeater Selection” on page 56).
Entering TMO or DMO
Enter TMO or DMO in one of the following ways:
• From the Home display press Optns and select Direct
Mode if the MTP850 is in TMO.
• From the Home display press Optns and select Trunked
Mode if the MTP850 is in DMO.
• Press and select More... > Networks > Trunked
Mode if the MTP850 is in DMO.
• Press and select More... > Networks > Direct
Mode if the MTP850 is in TMO.
While operating in DMO the propagation travels directly from the
transmitting terminal antenna to the receiving terminal antenna,
with no assistance from any base station or tower. Therefore,
the range is critically dependent on the position of the user and
the antenna. To achieve best results, hold the terminal in the
hand as high as comfortably possible, and be sure not to
obstruct the antenna in any way. Be sure that the antenna is
clear from the body, cables, or other obstructions.
As there is no tower-mounted base station to assist, and the two
users are usually standing at ground level, the range is usually
shorter than that can be achieved towards a tower or hilltop. Any
obstructions (hills, buildings, etc.) between the users will further
decrease the range. Conversely, raising the terminal higher or
moving to a higher location may improve the range.
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