Operation; Features; Front Panel Controls & Display; Front Panel Controls - E.F. Johnson Company Summit DM 975x Service Manual

3.1 FEATURES

NOTE: System operator programming determines the
availability of some of the preceding features.
GENERAL FEATURES
•
Up to 32-100 systems programmable (the maximum
varies with type and no. of groups)
•
Each system programmable for Multi-Net, LTR, or
conventional operation
•
Up to 11 (Multi-Net) or 10 (LTR and conventional)
groups programmable per system
•
Liquid Crystal Display (LCD) with backlight
•
Six programmable option switches
•
System scan
•
Group scan (except some early versions)
•
User programmable system and group scan list
•
Phone mode
•
Horn or light alert to signal when a call is received
•
Call indicator
•
Proceed (clear-to-talk) tone
•
Emergency switch
•
Banks of systems programmable
•
Time-out timer
•
Five different power levels programmable on each
system
Write-On  flash memory for convenient software
•
updates
•
Voice encryption available
•
2
UD I universal interface available (later models)
•
Compatible with Summit control unit
•
Cloning ability which allows one transceiver to
program another with same information
MULTI-NET FEATURES
•
Busy queuing
•
Auto-registration
•
Status message transmission
•
Unique ID calls to specific mobiles
•
Transmit inhibit
LTR FEATURES
•
Free system ringback
•
System search
SECTION 3 OPERATION
•
Transpond
•
Transmit inhibit
•
Busy indicator
•
Tone (CTCSS) and digital Call Guard squelch
•
Transmit disable on busy
•
Monitor switch
•
Repeater talk-around
•
Priority group sampling
•
Receive-only channels
3.2 FRONT PANEL CONTROLS AND DISPLAY
NOTE: The remote control unit front panel is the same
as the front panel on front mount transceivers.

3.2.1 FRONT PANEL CONTROLS

On-Off/Volume - Pressing this knob turns power on
and off. The vehicle ignition switch may also control
power (see Section 3.6.7). Rotating this control sets
the volume level.
Select Switch - This switch changes the selected
system or group number and is also used at other
times, such as in the Menu Mode, to select parameters
(see Section 3.5).
group, turning it clockwise increases the system or
group number and turning it counterclockwise
decreases the system or group number. Only system/
groups in the current bank can be selected (see Section
3.6.6). After the highest system or group is displayed,
the display wraps around to the lowest system or
group and vice versa. When wrap-around occurs, a
beep sounds.
cates which is changed by this switch. To switch this
bar between the system and group displays, press the
Select switch. The transceiver can be programmed so
that this bar defaults to either the system or group
3-1
CONVENTIONAL FEATURES
FRONT PANEL CONTROLS
When it is used to change the selected system or
A bar above the system or group number indi-

OPERATION

Revised February 1997
Part No. 001-9750-005