E.F. Johnson Company 98xx LOW TIER, Руководство по эксплуатации

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LTR AND CONVENTIONAL OPERATING MODES
29
LTR AND CONVENTIONAL
OPERATING MODES
General
Each selectable channel can be programmed for LTR or conven-
tional operation by your system operator. The operation that is
programmed is determined by the type of radio equipment being used in
your radio system. There are only a few differences in operation, and they
are described in the following information and elsewhere in this manual
as required.
LTR Operation
The LTR mode provides automatic channel selection (trunking) and
monitoring before transmitting. In addition, special tones indicate busy
and out-of-range conditions. Selecting an LTR channel actually selects an
encode and decode ID code and other information which may include
priority, block, and telephone ID codes. The encode and decode ID codes
control the mobile or group of mobiles being called and also what calls
are received. LTR features are described starting on page 30.
Conventional Operation
In the conventional mode, selecting a channel selects an actual radio
channel and the squelch coding (if any) used on that channel. A busy
channel is detected manually or automatically as described in the
following information. An out-of-range condition cannot be detected
automatically in this mode but may exist if you cannot get a response to
any of your messages. Refer to “Operation At Extended Range” on
page 38 for more information.
To properly receive calls in the conventional mode, the squelch
control must be set as described in “Setting Squelch Level” on page 14. If
this control is not set properly, weak messages could be missed or noise
could be heard when no message is present. In the LTR mode, the squelch