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The four line LCD gives you the 
familiar look and feel of the TETRA radio. 

ModeL 390 functions

The Model 390 presents the standard radio front panel 
control functions found on the MTM300/700, as well as a 
number of additional operator functions valuable in a radio 
dispatching environment.

SPEED CALL 
SELECTORS

EXTERNAL ALARM 
ON/OFF

PRIVATE CALL

ADDITIONAL FUNCTIONS

● 

RADIO RESET 

● 

ADJACENT CONTROLLER MUTE

● 

LINE CONTINUITY CHECK 

● 

REMOTE RELAY OUTPUT

STATUS INDICATORS
LED indicators show the status of function buttons.  

SECURE MODE

INTERCOM

SELECT

MUTE

CALL CLEAR

TRANSMIT

EMERGENCY 
ALARM

SENDING STATUS

TELEPHONE CALL

DIRECT MODE

SELECTING 
A TALKGROUP 

GROUP CALL

features

For a full description of the radio, its features and 
operation, refer to the radio user’s guide.

Supervisor take-over and output switch 
enables supervisor to clear calls at other 
controllers and to switch the control 
output contact at each controller. Supports 
emergency applications, including disabling 
other controllers or activating an alarm.

function Buttons

Additionally, indicators show:

● 

LOUDSPEAKER OPEN 

● 

REGISTERED 

● 

SCAN

● 

IN USE 

Each Model 390 has its own individual volume setting.

Functions: access to all radio front panel 
functions using clearly labeled keys.

Intercom: talk directly to other Model 
390s without using the radio. Radio 
audio still sent to controller even when 
intercom is in use.

Mute: disables all receive 
audio for operator quiet working. 
Automatic adjacent controller 
mute to eliminate audio feedback.

Secure Mode: prevents all other 
Model 390s from monitoring the 
conversation, transmitting, and/or 
changing radio settings. Provides 
user confidentiality.

Optional on-line or off-line programming. 
On-line saves cost of programming 
software, off-line  avoids system down 
time during programming.

Desktop presentation with handset 
provides telephone style operation.

Up to 15 parallel controllers share 
one radio. Multiple dispatchers have 
access to the radio system improving 
efficiency without the additional 
purchase or airtime rental 
cost of multiple radios.

Handset for semi-private 
conversations. Speaker and 
microphone for easy use.

Connections for recorder, 
extra amplified speaker, 
headset, desk microphone 
and footswitch.

Output contact can be 
triggered on incoming calls.

Remote Controller up to 600m from radio, or 
remoted, ISDN or private wire with a Model 232 Interface.  
Enables radio to be located for best reception,  
while putting controller near operator. Extends radio  
access to locations out of radio coverage.  
Provides inter-region working into remote TETRA networks.

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