User's Manual

08RE399 TDFM-136B Operating Instructions
2.2.2 Operating Modes
The operating mode is defined as the RF channel spacing and modulation type used for the
selected channel/memory on the transceiver.
The unit supports three operating modes: Analog wide, analog narrow, and P25 digital. In the
analog wide mode, the radio is operating on 25kHz. channel spacing, on both analog narrow, and
in P25 digital mode, the radio operates with 12.5kHz. channel spacing. In analog modes the
transceiver operates using standard frequency modulation, in the P25 mode the unit uses C4FM.
Table 2-1 shows the available Operating Modes, the bandwidth, and the indicating character used.
Table 2-1 Transceiver Operating Modes
Operating Mode Bandwidth Indicator
Analog Wide 25 kHz
'w'
Analog Narrow 12.5 kHz
'n'
P25 Digital 12.5 kHz
'D'
The user can easily switch between modes on any memory for any channel (ie any Main memory,
and both Guard1 and Guard2). Since the squelch modes are not common across analog and
digital operating modes, if you change between these modes, the Squelch Mode will be affected
(for more on this see 'Squelch Modes' below).
The operating mode is a simplex parameter.
Editing Operating Mode
The edit operating mode command is easily accessible, it is command L1-3. To access this
command, simply press '3', on the front panel keypad. Notice that the key is also marked “MODE”.
This command allows the user to edit the operating mode of the selected channel & memory. Since
operating mode is simplex only, the editor is very simple. Upon start, the cursor appears at the
operating mode character field of the channel to be edited. The edit screen appears as follows:
Figure 2-5. The user screen to edit the Main Operating Mode.
You may now edit the Operating Mode as follows:
step up/down through available operating modes (w, n, D)
accept the entry and exit
abandon the entry and exit
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