Midland Radio T20 User Manual

T20 FRS portable tr ansceiver
User interface Def inition

Revision History

Version

1.0 Release 16FEB18 R Hollis

2.0 Added Weather mode activation; Changed product name from T200 to

Description Date Author

19FEB18 R. Hollis

T20.

Midland Radio Corporation

T20 User Interface Definition V2-0 Page 2 of 10

T20 User interface definition

The T20 portable transceiver user interface will consist of a 19mm x 13mm (active area) LCD display and
5 silicon rubber pushbuttons. The user will use the keypad and LCD to access all of the radio functions,
set or change operation parameters and to operate the radio.

Keypad

The keypad will consist of the following 5 keys:

Function

Key

Menu

Single press Long press (3 seconds)
Menu select Power

• Power on/off (toggle function – if
power is on, the unit will turn off.
If power is off, unit will turn on.)

MON

SCAN

SCAN

• Scan function on/off (toggle
function)

MON

• Monitor function on/off (toggle
function)

Down ARROW

• In standby, receive or
weather mode, this button
adjusts volume down.

LOCK

• Locks and unlocks the keypad
functions. (toggle function)

• In menu mode (FRS and
weather), this button moves
the user down through
feature selections.

CALL

Up arrow

• In standby, receive or
weather mode, this button
adjusts volume up.

CALL

• Causes radio to transmit call tone
on selected channel.

• In menu mode (FRS and
weather), this button moves
the user up through feature
selections.

PTT

Push to talk

• Press and hold the PTT
button to transmit.

• In menu mode a single
push of the PTT button will

There is NO long press function for the
PTT button.

save the current setting and
exit menu mode.

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Large 7-segment – 2 digits

Small 7 segment – 2 digits

Indicates locked keypad. (PTT still active)

Active when radio is transmitting

T20 User Interface Definition V2-0 Page 3 of 10

Display

The radio will have an LCD for displaying user information as follows:

T20 LCD

LCD segment description

Channel number

CTCSS code

VOX Voice Activated microphone indicator

RX Active when radio is receiving
TX

Modes of operation

The radio has 5 modes of operation when the unit is powered on.

1. Standby

In Standby Mode, the radio is monitoring the current selected channel and will switch to Receive
mode if activity is detected.

Indicates weather radio mode. Flashing if weather alert is
active.

Battery level indicator

Midland Radio Corporation

(Flashing)

T20 User Interface Definition V2-0 Page 4 of 10

2. Receive

In receive mode, the radio has detected activity on the current selected channel and that activity
will be heard by the user on the speaker.

3. Transmit

In transmit mode, any audio picked up by the microphone will be broadcast on the current
selected channel. Transmit mode is entered one of 2 ways:

a. When the user presses the PTT button. The radio will stay in transmit mode as long as the PTT

button is depressed or until 180 seconds has elapsed. (Releasing the PTT will restart the 180
second timeout.)

b. If VOX is turned on, any audio detected by the microphone will be broadcast.

4. Scan

In scan mode, the radio will scan all channels (1 – 22) for activity.

5. Weather

In weather mode, the radio will monitor a user selected NOAA weather channel (1-10). If weather
alerts are turned on, the radio will periodically check for a weather alert tone (on the selected
channel) and automatically switch to Weather mode if an alert tone is detected.

BATTERY LEVEL INDICATION

• The radio will have a BATTERY LEVEL METER that shows the battery power level. The greater the number

of bars visible, the stronger the battery level.

o 3 Bars = Full Battery

o 2 Bars = 2/3 Battery

o 1 Bar = 1/3 Battery

o No bar = battery low

• The BATTERY LEVEL METER is visible at all times while the radio is powered on.
(Actual trigger voltages for these 4 levels will be defined in the T200 technical specification.)

Midland Radio Corporation