Question 1

What does CHL Name do on the Radtel RT-900?

Accepted Answer

Channel name — the label displayed for the current memory channel

Question 2

What does RX Frequency do on the Radtel RT-900?

Accepted Answer

Receive frequency for the current VFO or channel

Question 3

What does TX Frequency do on the Radtel RT-900?

Accepted Answer

Transmit frequency for the current VFO or channel

Question 4

What does R-CTCSS do on the Radtel RT-900?

Accepted Answer

RX CTCSS tone — squelch only opens when this analog sub-audible tone is detected on the incoming signal

Question 5

What does R-DCS do on the Radtel RT-900?

Accepted Answer

RX DCS code — squelch only opens when this digital coded sub-audible squelch stream is detected

Question 6

What does T-CTCSS do on the Radtel RT-900?

Accepted Answer

TX CTCSS tone — continuous sub-audible tone transmitted during PTT, typically required to access repeaters

Question 7

What does T-DCS do on the Radtel RT-900?

Accepted Answer

TX DCS code — digital coded sub-audible squelch transmitted during PTT

Question 8

What does BandWidth do on the Radtel RT-900?

Accepted Answer

Channel bandwidth — Wide (25 kHz) or Narrow (12.5 kHz)

Question 9

What does TXP do on the Radtel RT-900?

Accepted Answer

TX power level for the current channel

Question 10

What does Silence Mode do on the Radtel RT-900?

Accepted Answer

Speaker mute mode for the current channel

Question 11

What does TX Forbid do on the Radtel RT-900?

Accepted Answer

Disable transmit on the current channel (receive only)

Question 12

What does Shift DIR do on the Radtel RT-900?

Accepted Answer

Repeater offset direction — determines whether TX frequency is added to or subtracted from RX

Question 13

What does OFFSET do on the Radtel RT-900?

Accepted Answer

Repeater frequency offset amount

Question 14

What does MEMCH do on the Radtel RT-900?

Accepted Answer

Save current VFO settings into a memory channel slot

Question 15

What does DELCH do on the Radtel RT-900?

Accepted Answer

Delete a stored memory channel

Question 16

What does VFO FreqRang do on the Radtel RT-900?

Accepted Answer

VFO scan range — defines the frequency window for VFO-mode scanning

Question 17

What does Scan Mode do on the Radtel RT-900?

Accepted Answer

Scan resume method — how the scanner behaves when it finds an active signal

Question 18

What does DTMFST do on the Radtel RT-900?

Accepted Answer

DTMF tone setting — controls when DTMF side tones are heard during transmission

Question 19

What does PTT ID do on the Radtel RT-900?

Accepted Answer

PTT ID mode — whether to send the DTMF identifier at the beginning, end, or both sides of a transmission

Question 20

What does PTT-LT do on the Radtel RT-900?

Accepted Answer

PTT ID pre-delay — pause between PTT press and DTMF ID transmission so the repeater can identify first

Question 21

What does Squelch do on the Radtel RT-900?

Accepted Answer

Squelch threshold — higher values require stronger signals to open the audio gate

Question 22

What does RX Save do on the Radtel RT-900?

Accepted Answer

Battery-saver ratio — duty cycle of receiver active time vs sleep time in standby

Question 23

What does VOX Switch do on the Radtel RT-900?

Accepted Answer

Voice-activated transmit — automatically keys PTT when microphone detects speech

Question 24

What does VOX Level do on the Radtel RT-900?

Accepted Answer

VOX sensitivity — how loud audio must be to trigger voice-activated TX

Question 25

What does VOX Delay do on the Radtel RT-900?

Accepted Answer

VOX hang time — how long TX stays active after voice drops, preventing rapid cycling

Question 26

What does TX OVer Time do on the Radtel RT-900?

Accepted Answer

TX timeout timer — automatically ends transmission after this duration to prevent accidental long keydowns

Question 27

What does Language do on the Radtel RT-900?

Accepted Answer

Menu language

Question 28

What does VOICE do on the Radtel RT-900?

Accepted Answer

Voice prompts — spoken confirmations when changing settings or menus

Question 29

What does Menu HangTime do on the Radtel RT-900?

Accepted Answer

Menu auto-exit timer — idle time before the menu closes automatically

Question 30

What does BEEP PROMPT do on the Radtel RT-900?

Accepted Answer

Keypad beep — audible feedback when pressing buttons

Question 31

What does Roger Beep do on the Radtel RT-900?

Accepted Answer

TX end tone — sound played to the other party at the end of your transmission

Question 32

What does POWER ON TYPE do on the Radtel RT-900?

Accepted Answer

Startup display mode — show the logo or a custom text message at boot

Question 33

What does Power On Tone do on the Radtel RT-900?

Accepted Answer

Startup beep played when the radio powers on

Question 34

What does Power on MSG do on the Radtel RT-900?

Accepted Answer

Custom startup message text shown when POWER ON TYPE is set to Message

Question 35

What does POWER ON PWD do on the Radtel RT-900?

Accepted Answer

Power-on password — numeric code required before the radio becomes operational after boot

Question 36

What does Dual Watch do on the Radtel RT-900?

Accepted Answer

Dual frequency receive — monitors VFO A and VFO B alternately

Question 37

What does MDF-A do on the Radtel RT-900?

Accepted Answer

VFO A display mode — what to show on the A line of the main display

Question 38

What does MDF-B do on the Radtel RT-900?

Accepted Answer

VFO B display mode — what to show on the B line of the main display

Question 39

What does RP-STE do on the Radtel RT-900?

Accepted Answer

Repeater squelch tail elimination — suppresses the tail from a repeater's transmission

Question 40

What does RPT-RL do on the Radtel RT-900?

Accepted Answer

Repeater tail tone time — duration of the squelch tail signal sent to the repeater

Question 41

What does ALERT do on the Radtel RT-900?

Accepted Answer

Alert tone frequency — used for CTCSS-access repeaters (1750 Hz is the European standard)

Question 42

What does Freq Step do on the Radtel RT-900?

Accepted Answer

VFO step size — the increment when tuning up/down with arrows

Question 43

What does Busy Lockout do on the Radtel RT-900?

Accepted Answer

Busy Channel Lockout — prevents TX when a signal is already present on the RX frequency

Question 44

What does Side Tone do on the Radtel RT-900?

Accepted Answer

Transmit side tone format for MDC1200 PTT signalling

Question 45

What does Alarm Mode do on the Radtel RT-900?

Accepted Answer

Alarm type — behavior when the alarm is triggered (on-site siren, broadcast sound, or broadcast code)

Question 46

What does PF1 do on the Radtel RT-900?

Accepted Answer

Side key 1 — short-press function assignment

Question 47

What does PF1 LONG PRESS do on the Radtel RT-900?

Accepted Answer

Side key 1 — long-press function assignment

Question 48

What does PF2 do on the Radtel RT-900?

Accepted Answer

Side key 2 — short-press function assignment

Question 49

What does ABR do on the Radtel RT-900?

Accepted Answer

Auto backlight timer — how long the LCD stays lit after the last interaction

Question 50

What does Brightness do on the Radtel RT-900?

Accepted Answer

LCD brightness level

Question 51

What does LCD Reflex do on the Radtel RT-900?

Accepted Answer

LCD inversion — invert the display for readability in different lighting

Question 52

What does AUTOLOCK do on the Radtel RT-900?

Accepted Answer

Automatic keypad lock — engages after idle timeout to prevent accidental key presses

Question 53

What does Radio Interrupt do on the Radtel RT-900?

Accepted Answer

Priority interrupt — whether the built-in FM broadcast radio can be interrupted by incoming 2-way transmissions

Question 54

What does Reset do on the Radtel RT-900?

Accepted Answer

Factory reset — wipe VFO settings only, or all settings including channels

Question 55

What does STOP WATCH do on the Radtel RT-900?

Accepted Answer

Built-in stopwatch utility

Question 56

What does VERSION do on the Radtel RT-900?

Accepted Answer

Firmware version — read-only display of current firmware identifier

All Menu Items

Channel Settings

Scanning

DTMF

Audio & Alerts

System

Repeater

Tuning

Alarm

Programmable Keys

Display

Other

#	Name	Function	Options	Default
1	CHL Name	Channel name — the label displayed for the current memory channel	12-char alphanumeric	(empty)
2	RX Frequency	Receive frequency for the current VFO or channel	Frequency input	—
3	TX Frequency	Transmit frequency for the current VFO or channel	Frequency input	—
4	R-CTCSS	RX CTCSS tone — squelch only opens when this analog sub-audible tone is detected on the incoming signal	Off + 51 tones (67.0–254.1 Hz)	Off
5	R-DCS	RX DCS code — squelch only opens when this digital coded sub-audible squelch stream is detected	Off + 210 codes + custom	Off
6	T-CTCSS	TX CTCSS tone — continuous sub-audible tone transmitted during PTT, typically required to access repeaters	Off + 51 tones (67.0–254.1 Hz)	Off
7	T-DCS	TX DCS code — digital coded sub-audible squelch transmitted during PTT	Off + 210 codes + custom	Off
8	BandWidth	Channel bandwidth — Wide (25 kHz) or Narrow (12.5 kHz)	Wide / Narrow	Wide
9	TXP	TX power level for the current channel	High / Low	High
10	Silence Mode	Speaker mute mode for the current channel	—	—
11	TX Forbid	Disable transmit on the current channel (receive only)	On / Off	Off
12	Shift DIR	Repeater offset direction — determines whether TX frequency is added to or subtracted from RX	Off / + / −	Off
13	OFFSET	Repeater frequency offset amount	Frequency input	0
14	MEMCH	Save current VFO settings into a memory channel slot	Channel 0–999	—
15	DELCH	Delete a stored memory channel	Channel 0–999	—
16	VFO FreqRang	VFO scan range — defines the frequency window for VFO-mode scanning	Frequency input	—

#	Name	Function	Options	Default
18	DTMFST	DTMF tone setting — controls when DTMF side tones are heard during transmission	Off / DT-ST / ANI-ST / DT+ANI	Off
19	PTT ID	PTT ID mode — whether to send the DTMF identifier at the beginning, end, or both sides of a transmission	Off / BOT / EOT / Both	Off
20	PTT-LT	PTT ID pre-delay — pause between PTT press and DTMF ID transmission so the repeater can identify first	0 / 100 / 200 / 400 / 600 / 800 / 1000 ms	0

#	Name	Function	Options	Default
21	Squelch	Squelch threshold — higher values require stronger signals to open the audio gate	0–10	5
22	RX Save	Battery-saver ratio — duty cycle of receiver active time vs sleep time in standby	Off / 1:1 / 1:2 / 1:4	Off
23	VOX Switch	Voice-activated transmit — automatically keys PTT when microphone detects speech	Off / On	Off
24	VOX Level	VOX sensitivity — how loud audio must be to trigger voice-activated TX	Off / On	Off
25	VOX Delay	VOX hang time — how long TX stays active after voice drops, preventing rapid cycling	0.5–2.0 seconds	1.0s
26	TX OVer Time	TX timeout timer — automatically ends transmission after this duration to prevent accidental long keydowns	Off / 15–180s (15s steps)	15s
27	Language	Menu language	English / Chinese	English
28	VOICE	Voice prompts — spoken confirmations when changing settings or menus	Off / On	On
29	Menu HangTime	Menu auto-exit timer — idle time before the menu closes automatically	5–60 seconds	10s
30	BEEP PROMPT	Keypad beep — audible feedback when pressing buttons	Off / On	On
31	Roger Beep	TX end tone — sound played to the other party at the end of your transmission	Off / Beep / Tone1200	Off

#	Name	Function	Options	Default
32	POWER ON TYPE	Startup display mode — show the logo or a custom text message at boot	Logo / Message	Logo
33	Power On Tone	Startup beep played when the radio powers on	Off / On	On
34	Power on MSG	Custom startup message text shown when POWER ON TYPE is set to Message	Text input	—
35	POWER ON PWD	Power-on password — numeric code required before the radio becomes operational after boot	Numeric	Off
36	Dual Watch	Dual frequency receive — monitors VFO A and VFO B alternately	Off / On	Off
37	MDF-A	VFO A display mode — what to show on the A line of the main display	Name / Freq / Ch# / Name+Freq	Freq
38	MDF-B	VFO B display mode — what to show on the B line of the main display	Name / Freq / Ch# / Name+Freq	Freq

#	Name	Function	Options	Default
39	RP-STE	Repeater squelch tail elimination — suppresses the tail from a repeater's transmission	0–10	0
40	RPT-RL	Repeater tail tone time — duration of the squelch tail signal sent to the repeater	0–10	0
41	ALERT	Alert tone frequency — used for CTCSS-access repeaters (1750 Hz is the European standard)	1000 / 1450 / 1750 / 2100 Hz	1000

#	Name	Function	Options	Default
42	Freq Step	VFO step size — the increment when tuning up/down with arrows	2.5 / 5.0 / 6.25 / 10 / 12.5 / 20 / 25 / 50 kHz	12.5
43	Busy Lockout	Busy Channel Lockout — prevents TX when a signal is already present on the RX frequency	Off / On	Off
44	Side Tone	Transmit side tone format for MDC1200 PTT signalling	Off / MDC1200	Off

#	Name	Function	Options	Default
46	PF1	Side key 1 — short-press function assignment	None / Torch / Power / Scan / VOX / Alarm / Radio	None
47	PF1 LONG PRESS	Side key 1 — long-press function assignment	None / Torch / Power / Scan / VOX / Alarm / Radio	None
48	PF2	Side key 2 — short-press function assignment	None / Torch / Power / Scan / VOX / Alarm / Radio	None

#	Name	Function	Options	Default
49	ABR	Auto backlight timer — how long the LCD stays lit after the last interaction	0–4	0
50	Brightness	LCD brightness level	Adjustable	Max
51	LCD Reflex	LCD inversion — invert the display for readability in different lighting	On / Off	Off
52	AUTOLOCK	Automatic keypad lock — engages after idle timeout to prevent accidental key presses	Off / 3 levels	Off

#	Name	Function	Options	Default
53	Radio Interrupt	Priority interrupt — whether the built-in FM broadcast radio can be interrupted by incoming 2-way transmissions	On / Off	Off
54	Reset	Factory reset — wipe VFO settings only, or all settings including channels	VFO only / All	—
55	STOP WATCH	Built-in stopwatch utility	—	—
56	VERSION	Firmware version — read-only display of current firmware identifier	Read-only	—