Midland T20 Manuale utente

Midland Radio Corporation

T20 FRS portable transceiver

User interface Definition

Revision History

Version Description Date Author

1.0 Release 16FEB18 R Hollis

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

T20. 19FEB18 R. Hollis

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

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 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.

•In menu mode (FRS and

weather), this button moves

the user down through

feature selections.

LOCK

•Locks and unlocks the keypad

functions. (toggle function)

CALL

Up arrow

•In standby, receive or

weather mode, this button

adjusts volume up.

•In menu mode (FRS and

weather), this button moves

the user up through feature

selections.

CALL

•Causes radio to transmit call tone

on selected channel.

PTT

Push to talk

•Press and hold the PTT

button to transmit.

•In menu mode a single

push of the PTT button will

save the current setting and

exit menu mode.

There is NO long press function for the

PTT button.

Midland Radio Corporation

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

Large 7

segment

–

2 digits

Channel number

Small 7 segment

–

2 digits

CTCSS code

VOX Voice Activated microphone indicator

Indicates locked keypad. (PTT still active)

Indicates weather radio mode. Flashing if weather alert is

active.

RX Active when radio is receiving

Active when radio is transmitting

Battery level indicator

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.

Midland Radio Corporation

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.

o3 Bars = Full Battery

o2 Bars = 2/3 Battery

o1 Bar = 1/3 Battery

oNo bar = battery low

(Flashing)

•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

T20 User Interface Definition V2-0 Page 5 of 10

User operation:

POWER ON/OFF

Press and hold the MENU/POWER button for 3 seconds to turn the radio on/off. During Power On,

the radio will beep once.

•The LCD will display all icons for 1

second and the LCD display will

indicate the last channel selected.

•After 1 second, the display will show

icons based on the last saved

settings.

(example shows channel 12 with

CTCSS of 3, no VOX, no weather

alert)

Note that a leading 0 is displayed as a single bar.

(segment “d”)

Volume up/down

To increase/decrease the volume level, press and release the ^/CALL or v/LOCK buttons during RX

or STANDBY mode

•The LCD will display Vo on the

channel digits and the volume level

on the CTCSS digits. The volume

level will increment or decrement as

the ^/CALL and v/LOCK keys are

pressed.

Transmitting and receiving

To TRANSMITT

•Press and hold the PTT button.

The TX icon will appear

continuously on the LCD display

while transmitting.

Transmitting, channel 2, no CTCSS.

Midland Radio Corporation

T20 User Interface Definition V2-0 Page 6 of 10

To RECEIVE

•The radio is ready to receive any

time the PTT button IS NOT

pressed. The RX icon will

appear on the display when the

radio is receiving a transmission.

The RX icon will go off when there

is no receive signal.

Recieving, channel 2, no CTCSS.

MONITOR

•Press and hold the MON/SCAN

button for 3 seconds to enter and

exit Monitor Mode

The RX icon will be shown constantly while in Monitor

mode even when there is no channel activity.

SCAN

•Press and release the MON/SCAN

button to enter and exit scan mode.

•The radio will scan each of the 22

channels at a 1/3 second rate and

stop on any active channel for 6

seconds before resuming scan.

•If the PTT button is pressed to

transmit on any channel, the

scanning function will stop and

remain on that channel.

Midland Radio Corporation

T20 User Interface Definition V2-0 Page 7 of 10

SCAN….continued

•If the ^/CALL or v/LOCK button is

pressed while the radio is scanning,

the scan direction will change to

increasing or decreasing

corresponding to which key is

pressed.

•If CTCSS is currently set for any

channel, that channel will be

scanned with the CTCSS code as

set.

•To resume scanning, press and

release the MON/SCAN button.

CALL

•To send a call alert, press and

hold the ^/CALL button for 3

seconds.

The TX icon will appear while transmitting a call alert.

•The call tone will be heard on the

speaker for confirmation.

KEYPAD LOCK

•To lock the keypad, press and

hold the v/LOCK button for 3

seconds.

•To unlock the keypad, press and

hold the v/LOCK button for 3

seconds.

The LOCK icon will appear on the display when the

keypad is locked.

•PTT and CALL buttons will still be

active.

Midland Radio Corporation

T20 User Interface Definition V2-0 Page 8 of 10

Weather mode

To enter Weather mode, press and hold both

the MON/SCAN and ^/CALL buttons at the

same time for 3 seconds. After 3 seconds,

the radio will enter Weather mode and monitor

the last channel set by the user.

RX is only active if the selected channel has an

audio signal present.

Press PTT to return to the FRS radio function.

Midland Radio Corporation

T20 User Interface Definition V2-0 Page 9 of 10

Feature select flowchart

MENU key operation from

FRS Standby mode

Standby mode

Select channel

VOX On/Off

MENU press

Select CTCSS

MENU press

Set Roger beep

MENU press

Set Silent mode

MENU press

During feature selection, the MON/SCAN key is

inactive.

Channel number will flash and will

increment or decrement when ^/CALL

or v/LOCK are pressed.

CTCSS number will will flash and will

increment or decrement when ^/CALL

or v/LOCK are pressed.

CTCSS number will flash and increment

or decrement from oF to 38 when

^/CALL or v/LOCK are pressed.

Leading zeros will be shown as the

bottom segment of the digit.

Range of channels is 1 to 22.

VOX icon will be on. Smaller 7-segment digits will flash and

alternate between oF and on as ^/CALL or v/LOCK are pressed.

Large 7-segment display will show “rb”. Smaller 7-segment digits

will flash and alternate between oF and on as ^/CALL or v/LOCK

are pressed.

Large 7-segment display will show “bP”. Smaller 7-segment digits

will flash and alternate between oF and on as ^/CALL or v/LOCK

are pressed.

Midland Radio Corporation

T20 User Interface Definition V2-0 Page 10 of 10

MENU key operation

from Weather mode

Weather mode

Select channel

MENU press

Select Weather

alert ON/OFF

MENU press

PTT press or

4 sec timeout will store

current setting

Channel number will flash and will

increment or decrement when ^/CALL

or v/LOCK are pressed.

Small 7-segment display will

alternate between oF and on when

^/CALL or v/LOCK are pressed.

Range of channels is 1 to 10.

Leading zero is displayed.

The weather icon wil flash in all

modes when weather alerts are

“on”.

Midland Radio Corporation

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