Midland T20 User manual

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
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.
•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
TX
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
MENU press
Set Roger beep
MENU press
Set Silent mode
MENU press
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
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