Midland CT 890 Manual

CT 890
”Instruction guide
DUAL BAND VHF/UHF TRANSCEIVER |

Midland CT890 instruction guide
Index
Content of the packaging 1
Maintenance 1
Main functions 2
Main controls and parts of the radio 3
Lcd Display 3
Buttons and controls of the radio 4
Quick search 6
RPT- Single/Dual Band switch 6
A/B switch 6
‘* SCAN’ key 6
DTMF code 6
Reverse Frequency function 6
Low battery level 6
Working modes 7
Cloning function with the optional cable cod. R73727 7
Battery recharge 7
Functions 9
Frequency step (STEP) - MENU 1 9
Squelch level (SQL-LE) - MENU 2 9
Power save (SAVE) - MENU 3 10
High/low power selection (TXP) - MENU 4 10
Roger Beep at the beginning/end transmission (ROGER) - MENU
5 10
TOT (Time Out Timer) - MENU 6 10
VOX (VOX) - MENU 7 11
Wide/narrow bandwidth (WN) - MENU 8 11
Voice function (VOICE) - MENU 9 11

Midland CT890 instruction guide
TOA (Transmission Overtime Alarm) - MENU 10 12
Beep tone (BEEP) - MENU 11 12
Language of the MENU (LANGUAGE) - MENU 12 12
Busy channel lockout (BCL) - MENU 13 12
SCAN function(SC-REV) - MENU 14 13
Receiving with CTCSS tones (R-CTCSS) - MENU 15 13
Transmitting with CTCSS tones (T-CTCSS) --- MENU 16 13
Receiving with DCS codes (R-DCS) - MENU 17 14
Transmitting with DCS (T-DCS) - MENU 18 14
CALL/VFTX functions (side key PF1) - MENU 19 14
Scan / LAMP / SOS / Telealarm / Radio / Disable functions with
side key 3 (PF3) - MENU 20 15
Display backlight (ABR) - MENU 22 17
Frequency offset (OFF-SET) --- MENU 23 17
Frequency shift direction (SFT-D) - MENU 24 18
Stopwatch timer (SECOND) - MENU 25 18
Channel name (CHNAME) - MENU 26 18
Storing channels (MEM-CH) --- MENU 27 19
Deleting a channel (DEL-CH) ------ MENU 28 19
Scan of frequencies with CTCSS/DCS (SCNCD)
MENU 29 19
Welcome message (PONMSG) – MENU 30 20
Monitor (SP-MUTE) – MENU 31 20
Sending the ID code (ANI-SW) – MENU 32 21
Setting the ID ANI code (ani-edit) – MENU 33 21
DTMF (DTMF-ST) – MENU 34 21
Keypad lock (AUTOLOCK) - MENU 35 22
Setting the priority channel (PRICH-SW) - MENU 36 22
Repeater function / Full duplex (RPT-SET) - MENU 37 22
RPT-SPK - MENU 38 23
PTT - MENU 39 23
Adding a channel to scan (SCAN ADD) - MENU 40 23
Alert tone (ALERT) - MENU 41 23
ANI code tx delay (PTT-DLY) - MENU 42 24

Midland CT890 instruction guide
Transmitting the ID code (PTT-ID) – MENU 43 24
Ring time (INRG) – MENU 44 24
Group A Scan (SCG-A) - MENU 45 25
Group B Scan (SCG-B) - MENU 46 25
Repeater tone (RPT-TONE) - MENU 47 25
Mute on the secondary frequency (SMUTESET) - MENU 49 26
Setting of group selective call code (CALL CODE) – MENU 50 26
Reset ---- MENU 51 27
Troubleshooting 28
Technical specifications 29

Midland CT890 instruction guide | 1
Content of the packaging
• 1 CT890 transceiver
• 1 belt clip
• 1 antenna
• 1 Li-Ion battery pack 2600mAh
• 1 desktop charger
• 1 wrist belt
• Quick guide
If any item is missing, please notify your Midland dealer.
Maintenance
Your Two Way Radio is an electronic product of exact design and should
be treated with care.
The suggestions below will help you to fulfill any warranty obligations
and to enjoy this product for many years.
• Do not attempt to open the unit. Non-expert handling of the unit may
damage it.
• Do not store the Radio under the sunshine or in hot areas.
• High temperatures can shorten the life of electronic devices, and
warp or melt certain plastics.
• Do not store the radio in dusty and dirty areas.
• Keep the Radio dry. Rainwater or damp will corrode electronic circuits.
• If it appears that the Radio diffuses peculiar smell or smoke, please
shut off its power immediately and take off the charger or battery
from the Radio.
• Do not transmit without antenna.

2 | Midland CT890 instruction guide
Main functions
• Dual band (VHF/UHF) displayed
• Frequency band (to set according to the country/area of use): 144-146
MHz & 430-440MHz (Rx / Tx).
• Working mode: UHF-VHF, VHF-VHF o UHF-UHF
• Output power: 5W VHF /4W UHF
• Memory channels: 999
• Full Duplex
• Repeater function
• Wide colorful LCD display
• Very high efficiency Li-Ion battery pack 2600mAh
• Repeater tones
• Individual/group selective calls
• VOX function
• Chronometer
• 105 + 105 DCS codes and 50 CTCSS tones
• “VOICE” function
• SOS function
• Wide/narrow bandwidth selection 25kHz/12,5 kHz
• Channel number, Channel + Frequency or Channel name display
mode available
• Reverse frequency
• Scan
• Flashlight
• FM Radio receiver
• Frequency step: 5 kHz, 6.25 kHz, 10 kHz, 12.5 kHz, 25 kHz, 50 kHz or
100kHz
• High/low power selection: high (4-5W) / low (1W)
• Frequency offset
• Repeater shift
• “Busy Channel Lock Out” function
• Tx power level indicator on the display
• Low battery vocal indicator
• Roger Beep
• TOT (time out timer) function
• Keypad lock
• Function/channel reset

Midland CT890 instruction guide | 3
Main controls and parts of the radio
Lcd Display
1. Cross-band repeater
2. VOX
3. Power save mode
4. Keypad lock
5. Battery indicator
6. FM Radio frequency
7. Reverse frequency
8. Priority channel indicator
9. Indicates the latest reception
10. Band in use
11. Memory channel number
12. VHF/UHF frequency
13. Indicator of high (H)/Low (L)
power transmission or recep-
tion
14. UHF/VHF frequency
15. Narrow bandwidth (N = nar-
row / W = wide)
16. Shift (positive / negative)
17. Activation of QT+DTMF
18. DCS code
19. CTCSS tone
20. Repeater function ON
21. Function mode
22. FM radio band
MENU
A/B
RPT
VFO/MR
EXIT
1
STEP
4
TXP
7
VOX
2
SQL
5
ROGER
8
W/N
3
SAVE
6
TOT
9
VOICE
*
SCAN
0
#
LOCK
CT890
1 2 3 4 5
7
8
10
9
11
12
14
18
19
20
17
15
16
2221
6
13

4 | Midland CT890 instruction guide
Buttons and controls of the radio
A. Antenna
B. Flashlight
C. Rotary encoder for the channel selection
D. Power / Switch / Volume control: Rotate to switch on/off the radio and
adjust the volume
E. Transmission led (red)
F. Reception led (green)
G. LCD display
H. Microphone
I. EXIT: to exit menu and functions
J. VFO/MR: to change the frequency or the channel mode
K. */SCAN: Reverse frequency/SCAN. Press to activate the Reverse fre-
quency; keep it pressed to activate the SCAN function.
L. #/LOCK: Keypad lock/Chronometer key. Short press: this key is operative
only when the chronometer is activated. Long press: keypad lock.
M. Alphanumerical keypad
N. ▲/▼ keys: to select the functions/menu
O. RPT. Short press: Single/Dual display mode. Long press: Activate or exit
the repeater function.
P. A/B. Switch key on master frequency: to select the desired operating fre-
quency (VHF or UHF).
Q. MENU: enters the MENU functions and confirms the selection.
R. Side-key PF1: Selective call/Secondary frequency transmission key. Ac-
cording to the functions that you have set (menu 19 of the radio), it al-
lows the transmission of the selective call or the repeater tone 1750Hz.
S. PTT
T. Side-key PF2. Long press: to activate the Monitor function. Short press:
turns the flashlight on. Press it again to turn it off.
U. Side-key PF3: it allows the activation of the following functions (menu
20): Scan / Display backlight off / Alarm / Emergency / FM radio.
V. MIC/SP: External speaker/mike jacks.
W. 2600mAh Li-Ion battery pack

Midland CT890 instruction guide | 5
MENU
A/B
RPT
VFO/MR
EXIT
1
STEP
4
TXP
7
VOX
2
SQL
5
ROGER
8
W/N
3
SAVE
6
TOT
9
VOICE
*
SCAN
0
#
LOCK
CT890
MENU
A/B
RPT
VFO/MR
EXIT
1
STEP
4
TXP
7
VOX
2
SQL
5
ROGER
8
W/N
3
SAVE
6
TOT
9
VOICE
*
SCAN
0
#
LOCK
CT890
R
S
T
U
W
V
MENU
A/B
RPT
VFO/MR
EXIT
1
STEP
4
TXP
7
VOX
2
SQL
5
ROGER
8
W/N
3
SAVE
6
TOT
9
VOICE
*
SCAN
0
#
LOCK
CT890
A
C D
E
F
G
H
I
J
K
L
M
O
N
Q
B
P

6 | Midland CT890 instruction guide
Quick search
Press ▼/▲ keys to set functions/parameters.
By keeping pressed these keys, a quick search of the functions will be
done.
RPT- Single/Dual Band switch
To set the single/dual band switch, press RPT.
A/B switch
Press the A/B switch to select the master frequency. The master fre-
quency is the main frequency and is shown on the display with MAIN.
‘* SCAN’ key
Press slightly the *SCAN key to set/disable the reverse frequency. Keep it
pressed for 2 seconds to activate the Scan function.
DTMF code
Press PTT and push the key corresponding to the desired DTMF code.
RPT, ▲, ▼, VFO/MR correspond to A, B, C and D.
Reverse Frequency function
Using the Reverse frequency function, the transmitting and receiving
frequencies can be interchanged, as well as the CTCSS and DCS codes.
In standby mode, press *SCAN to turn on the Reverse frequency fun-
ction; press it again to turn it off.
NOTE: Ensure to set the frequency shift direction first (MENU 23 and 24).
Low battery level
When the battery pack has low power, you will hear a beep every 5 se-
conds and the battery icon shows the low level. If you press PTT, you will
hear a vocal message ‘BATTERY LOW’.

Midland CT890 instruction guide | 7
Working modes
CT890 has 2 operating modes available: VFO (frequency mode) and MR
(channel mode).
In MR mode, the display can show:
• Channel number
• Frequency + channel number
• Channel name
To switch from the frequency mode to channel mode can be done ma-
nually or by means of the optional programming software PRG-10.
You can also set a password for the working modes, but only by using the
optional programming software:
press MENU; the display shows . Edit the password and press
MENU again.
If the password is composed of a series of 0, no password must be edited
to enter the working mode.
Cloning function with the optional cable cod. R73727
This function allows you to copy/transfer all data and settings from one
radio to another one; the procedure is very simple and does not need a
PC: just insert the two plugs of the cloning cable into the jack of the two
radios.
1. Connect the optional cable R73727 to both radios.
2. Turn on the radio‘slave’ (radio to program).
3. Press PF3 key on the radio master (radio to be copied) and turn it on
at the same.
4. The red led on the radio master starts blinking and the display shows
‘COPYING’: the cloning function is being activated. At the end, the
led turns off and the display shows‘FINISHED!’; if the red led remains
steady, the cloning procedure failed.
5. On the radio slave the green led blinks while cloning and turns off
when the procedure is finished.
6. Both radios will make a reset and will be ready for use.
Battery recharge
Insert the AC plug into the 240V socket. The charger’s led starts blinking,
indicating that it is in charging stand-by. Insert the transceiver or only the

8 | Midland CT890 instruction guide
battery pack into the charger cradle. The red led turns on indicating that
the battery pack is being charged. Once the led turns green, the battery
pack is fully charged.
NOTE: If the battery pack is totally discharged, the red led will be blinking for
10/20 minutes, then it will be steady red. Once the led turns green, the battery
is fully charged.

Midland CT890 instruction guide | 9
Functions
CT890 displays at the same time 2 frequency bands: the master frequency
(for transmission) that is indicated on the display with‘MAIN’ and the other
one is the secondary frequency and only can be used to receive.
• To choose the desired frequency (master or secondary), press the A/B
key.
• Under Frequency mode: the following 9 functions can be set on both
Bands: frequency step, output power, squelch level, channel ban-
dwidth, CTCSS, DCS, Frequency shift direction, frequency offset, and
Channel displaying mode.
• Under Channel mode: the following 7 functions can be set on both
Bands: Busy channel lockout, CTCSS, DCS, channel bandwidth, fre-
quency step, frequency shift direction and frequency offset.
Frequency step (STEP) - MENU 1
In stand-by mode press MENU + 1; the display will show “STEP”
Press MENU to enter the function and then the ▼/▲ keys to select the
desired frequency step. Push MENU again to confirm you selection.
To return to standby mode press EXIT.
CT890 has 7 frequency steps available: 5.00KHz, 6.25KHz, 10.00KHz,
12.50KHz, 25.00KHz, 50.00KHz and 100KHz.
Squelch level (SQL-LE) - MENU 2
This function turns on the Squelch when the signal is strong; the Squelch
will stay off when the signal is weak. Set the same DCS codes of your
group and turn on the squelch.
By setting the level too high, you may not receive the weak signals; while
by setting it too low you may receive noises or undesired signals.
NOTE: This transceiver has 10 (0-9) available levels: 0 means that the Squelch
is turned on. From level 1 to level 9 you will have different levels of noises
reduction. The higher is the level, the louder will be the Squelch.
In standby mode, press MENU + 2. The screen displays “SQL”.
Press MENU to enter to function. Press the ▲/▼ buttons or rotate the
encoder knob to select the desired Squelch level, then press MENU to
confirm. To return to the standby mode press EXIT.

10 | Midland CT890 instruction guide
Power save (SAVE) - MENU 3
To save battery power, this function can turn off the transceiver when no
signal is received.
In standby mode, press MENU + 3. The screen displays “SAVE”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder knob to select ON or OFF, then press MENU to confirm.
To return to the standby mode press EXIT.
High/low power selection (TXP) - MENU 4
You can choose between 5W (HIGH) or 1W (LOW) output power.
In frequency mode, press MENU + 4. The screen will display“TXP ”.
Press MENU to enter the function. Press the ▲/▼ keys or rotate the enco-
der to select HIGH or LOW power, then press MENU to confirm.
To return to the standby mode press EXIT.
Roger Beep at the beginning/end transmission (RO-
GER) - MENU 5
Thanks to this function you can select the Roger Beep tone with the fol-
lowing options:
• OFF: Roger Beep turned off (no tones).
• BOT: Roger Beep tone heard when the PTT button is pressed (when
transmission begins)
• EOT: Roger Beep tone heard when the PTT button is released (when
transmission ends)
• BOTH: Roger Beep tone heard when you press and release the PTT
button
In standby mode, press MENU + 5. The screen will display“ROGER”.
Press MENU to enter the function. Press the ▲/▼ keys or rotate the
encoder to select OFF/BOT/EOT/BOTH, then press MENU to confirm.
To return to the standby mode press EXIT.
TOT (Time Out Timer) - MENU 6
The TOT function is used to prevent a too long transmission. This function
temporarily blocks transmissions if the radio has been used beyond the
maximum time permitted. Once reached the preset timer, the radio will

Midland CT890 instruction guide | 11
be forced in reception mode. When a transmission exceeds the pre-set
time, you will hear a warning sound to remind you that the transmission
time is almost finished.
The transmission time can be set in 60 levels with 15 seconds each
(between 15 and 900 seconds).
In standby mode, press MENU + 6; the screen will display “TOT”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder to select the desired TOT level, then press MENU to confirm.
To return to the standby mode press EXIT.
VOX (VOX) - MENU 7
This function allows hands-free conversations: just speak in the direction
of the microphone and the communication will be automatically activa-
ted.
In standby mode, press MENU + 7. The screen will display“VOX”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder to turn off the VOX function or to select the VOX level (1-10),
then press MENU to confirm.
To return to the standby mode press EXIT.
NOTE: level 1 is the least sensitive while level 9 is the most sensitive. When the
radio is in Scan or FM Radio mode, the VOX is not enabled.
Wide/narrow bandwidth (WN) - MENU 8
In standby mode, press MENU + 8. The display will show“WN”.
Press MENU to enter the function. Press the ▲/▼ keys or rotate the en-
coder to select WIDE/NAR (25/12,5KHz) bandwidth, then press MENU to
confirm. To return to the standby mode press EXIT.
Voice function (VOICE) - MENU 9
In standby mode, press MENU + 9; the screen will display “VOICE”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder to select OFF/ON. Confirm your selection by pressing MENU.
To return to the standby mode press EXIT.

12 | Midland CT890 instruction guide
TOA (Transmission Overtime Alarm) - MENU 10
With the TOA function enabled, if the TOT function (Time Out Timer) has
been turned on and your transmission reaches the pre-set end-transmis-
sion time, the transceiver will warn you and the TX red indicator starts
blinking.
You can set from 1 to 10 TOA levels. Level 1 means that the transceiver
warns you 1 second before the transmission reaches the TOT; level 2
warns you 2 seconds before the TOT and so on.
In standby mode, press MENU + 10. The display will show“TOA”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder to select OFF or 1 of the 10 levels, then press MENU to confirm.
To return to the standby mode press EXIT.
Beep tone (BEEP) - MENU 11
If you enable this function, every time a button is pressed, you will hear
a Beep tone.
In standby mode, press MENU + 11. The screen will display“BEEP”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder to turn ON/OFF the beep function.
Press MENU to confirm and EXIT to return to stand-by mode.
Language of the MENU (LANGUAGE) - MENU 12
This section shows the language of the MENU (english).
In standby mode press MENU + 12; the display will show “LANGUAGE”.
Busy channel lockout (BCL) - MENU 13
When this function is active, if you select a busy channel and press the
PTT, the transceiver will not transmit.
In standby mode, press MENU + 13. The screen will display“BCL”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder to select ON/OFF, then press MENU to confirm.
To return to the standby mode press EXIT.
This function is not active when the Repeater function is enabled.

Midland CT890 instruction guide | 13
SCAN function(SC-REV) - MENU 14
This transceiver has 3 Scan modes:
• TO - Time-operated Scan
Whenever a signal is detected, the radio will suspend the scan for 5 se-
conds, and then will continue to scan even if the signal is still present.
• CO: Carrier-operated Scan
Whenever a signal is detected, the radio will stop scanning. It will re-
sume to scan once the signal will be no more present.
• SE: Search Scan
The radio will stop scanning and EXIT the Scan mode once detected a
signal.
In standby mode, press MENU + 14. The screen displays “SC-REV”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder to select the desired Scan mode, then press MENU to confirm.
To return to the standby mode press EXIT.
To start the scan keep pressed *SCAN for 2 seconds.
Receiving with CTCSS tones (R-CTCSS) - MENU 15
CTCSS tones are similar to access codes and enable the radio to commu-
nicate with the users that are tuned on the same channel and have set
the same CTCSS tone.
In frequency mode, press MENU + 15. The screen displays “R-CTC”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder to turn OFF this function or to select a CTCSS tone from 67.0Hz
to 254.1Hz. Press MENU to confirm and EXIT to return to the standby
mode press.
NOTE: This transceiver has 50 CTCSS groups.
Transmitting with CTCSS tones (T-CTCSS) --- MENU 16
In standby mode, press MENU + 16. The screen displays “T-CTC”.
Press MENU to enter the function. Press the ▲/▼ keys or rotate the en-
coder to turn OFF this function or to select a CTCSS tone from 67.0Hz to
254.1Hz, then press MENU to confirm.
To return to the standby mode press EXIT.
NOTE: This transceiver has 50 CTCSS groups.

14 | Midland CT890 instruction guide
Receiving with DCS codes (R-DCS) - MENU 17
DCS codes are similar to access codes and can be added to channels, so
as to create a sort of personal channel . They enable the radio to commu-
nicate with the users that are tuned on the same channel and have set
the same DCS code.
In frequency mode, press MENU + 17. The screen displays “R-DCS”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder to turn OFF this function or to select a DCS code from D023N
to D754I.
Press MENU to confirm and EXIT to return to the standby mode.
NOTE: You can set up to 105 DCS N and 105 DCS I codes.
Transmitting with DCS (T-DCS) - MENU 18
In standby mode, press MENU + 18. The screen displays “T-DCS”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder to turn OFF this function or to select a DCS code from D023N to
D754I, then press MENU to confirm.
To return to the standby mode press EXIT.
NOTE: You can set up to 105 DCS N and 105 DCS I codes.
CALL/VFTX functions (side key PF1) - MENU 19
The side key PF1 can be associated to one of the following functions:
CALL (selective calls) / VFTX (transmission on the secondary band).
NOTE: the selective call can be programmed by means of the optional pro-
gramming software PRG-10.
In Standby mode press MENU + 19; “PF1” will appear on the display.
Press MENU to enter the function. Press the ▼/▲ keys or rotate the en-
coder to activate one of the 2 functions and confirm by pushing MENU
again. Press EXIT to return to the standby mode.

Midland CT890 instruction guide | 15
Scan / LAMP / SOS / Telealarm / Radio / Disable fun-
ctions with side key 3 (PF3) - MENU 20
The side key PF3 can enable the following functions:
• SCAN: Channel Scan
• LAMP: display backlight off
• SOS: SOS function
• TELEALARM: tele-alarm function
• RADIO: FM radio
• DISABLE: disabling the functions
1. Channel Scan:
In standby mode, press MENU + 20. The screen displays “PF3”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate
the encoder to select the desired function, then press MENU to con-
firm. To return to the standby mode press EXIT.
Once the function is enabled, press the Side key PF3 to enter the Scan
mode (Scan mode can be set through MENU + 14. To stop scanning,
press any key.
2. Display backlight off:
In standby mode, press MENU + 20. The screen displays “PF3”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate
the encoder to select LAMP, then press MENU to confirm.
To return to the standby mode press EXIT.
3. SOS:
In emergency situations, the SOS function transmits an SOS signal/
emergency calls. You will hear a beep and the two leds will alternately
blink. The emergency signal will be transmitted every 5 minutes, la-
sting for 10 seconds each time.
To stop transmitting, press PTT.
If a carrier signal is detected during the transmission interval, the ra-
dio switches to reception.
In standby mode, press MENU + 20. The screen displays “PF3”.
Press MENU to enter the function. Press the ▲/▼ buttons or rotate the
encoder to select SOS; the screen will display “SOS”.

16 | Midland CT890 instruction guide
Press MENU again to confirm. You will hear a tone and the leds will alter-
nately blink. Now the SOS function is set.
Once the function has been enabled, if you press the PF3 side key, the
transceiver will transmit the SOS signal.
4. TELEALARM:
The radio transmits an ID code (ANI ID) followed by 110. Then, there
will be a sound and visual warning and the radio will switch to recep-
tion. This procedure is repeated more times.
In Standby mode press MENU + 20; the display will show “PF3”.
Press MENU to enter the function. Press ▼/▲ keys or rotate the enco-
der to select Telealarm and confirm by pushing MENU.
With the EXIT key you return to standby mode.
5. RADIO:
Turn on the Radio: In standby mode, press the side key PF3 to turn on
the function. The display will show the frequency in use and the FM
radio frequency.
Tune the radio stations: In Radio mode, press *SCAN. The radio will
search the stations automatically and will stop once found the sta-
tion.
Manually searching an FM station: keep pressed the RPT key for 2 se-
conds, then edit the desired FM station. To EXIT FM Radio mode press
PF3.
NOTE: When you are listening to the radio, the current frequency/channel is
still in use.
To transmit, press the PTT button. Once the transmission ends, after 5 secon-
ds, the radio will return to FM Radio mode.