Retevis RB627B - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The Retevis RB627B/V is a two-way radio designed for PMR446 and FreeNet operation, offering a range of features for reliable communication.

Function Description:

The RB627B/V is a portable two-way radio that operates on either PMR446 or FreeNet frequencies. It allows users to communicate over a distance with other radios set to the same channel and privacy code. Key functions include transmitting and receiving voice messages, scanning channels for activity, monitoring channels, and utilizing various alert and convenience features. The radio supports hands-free operation (VOX) and includes an FM radio receiver. It is designed for ease of use with a clear LCD display and intuitive button controls.

Important Technical Specifications:

Operating Modes: PMR446/FreeNet
Frequency Range:
- PMR446: 446.00625 MHz to 446.19375 MHz (16 channels)
- FreeNet: 149.0250 MHz to 149.1125 MHz (6 channels)
Transmission Power: 0.5W (500 mW)
Bandwidth: 12.5 kHz
Sub-audio Codes: 50 CTCSS Tones and 208 DCS Codes (258 Privacy Codes total)
Frequency Stability: ±2.5ppm
Operation Voltage: DC3.7V ±10%
Battery Capacity: 1500mAh Li-Ion
Operating Temperature: -20 °C to +50 °C
Mode of Operation: Simplex
Antenna Impedance: 50ohm
Send Time Limit (TOT): Max. 180 seconds (adjustable: 30/60/90/120/150/180s)
Receiver Sensitivity: 0.25μV (12dB SINAD)
Adjacent Channel Selectivity: ≥55dB@12.5KHz
Inter Modulation and Rejection: ≥55dB@12.5KHz
Conducted Spurious Emission: ≤-57dB@12.5KHz
Rated Audio Power Output: 0.75W @8ohms
Receive Current: ≤380mA
Rated Audio Distortion: ≤5%
Charger: Fast desktop charger, Micro-USB Charging Port (DC5V USB input)

Usage Features:

Turning On/Off and Volume Control: A rotary knob controls both power and volume. Turn clockwise to power on and increase volume, counter-clockwise to power off and decrease volume.
Channel Selection: The radio has 30 channels. Use the + and - keys to navigate channels. Press and hold to scroll quickly.
Talking and Listening: Hold the PTT (Push-to-Talk) key to transmit and release to receive. Maintain a distance of 2-3 cm from the microphone for clarity.
SCAN Function: Press and hold the SCAN key for 2 seconds to activate channel scanning. The radio will scan all 30 channels and stop on active ones. It resumes scanning after 4 seconds of inactivity. Press PTT to transmit on an active channel during scan, which will pause scanning for 5 seconds.
Monitor Function: Press and hold the MONI key for 2 seconds to enter monitor mode, allowing you to hear background noise and adjust volume without a signal. Hold for 3 seconds to exit.
Keypad Lock: Press and hold the A/B key for 2 seconds to lock or unlock the keypad, preventing accidental setting changes. PTT, LAMP, MONITOR, and FM keys remain active.
A/B Switch: In standby mode, press the A/B key to switch between main/sub channels.
Flashlight and Emergency Alert: Press LAMP once for a steady flashlight, press again for flashing, and a third time to turn off. Press and hold LAMP for 2 seconds to activate an audible and visual alarm.
FM Radio: Press FM to turn on the FM radio (76-108MHz). Use + and - keys to select frequencies. Press FM again to exit. The radio automatically switches to channel mode if a signal is received on A/B, and back to FM mode when the signal disappears.
Tone-burst: Simultaneously press PTT with -DOWN for 1450Hz, +UP for 1750Hz, or MENU for 2100Hz tone bursts.
Menu System:
- Enter the menu by pressing MENU.
- Use + and - keys to navigate menu items.
- Press MENU again to select an item.
- Use + and - to select a parameter.
- Press MENU to confirm and save, or A/B to cancel and exit the menu.
- Press A/B at any time to exit the menu.
Privacy Codes (RXCODE/TXCODE - Menu 01/02): Configure different receiving and transmitting privacy codes (CTCSS/DCS) for each channel. "OFF" disables the feature.
Squelch Level (SQL - Menu 03): Adjustable in 10 levels (0-9). Level 0 means squelch is on, 1-9 offer varying noise reduction. Higher levels mean louder squelch.
Backlight Intensity (LIGHT - Menu 04): Set LCD backlight to ON (always on), OFF (always off), or KEY (activates with key press, turns off after 5 seconds of inactivity).
Beep Tone (BEEP - Menu 05): Enable or disable key press beep sounds.
VOX (VOX - Menu 06): Hands-free operation with 5 sensitivity levels (OFF/1-5). Level 5 is low sensitivity for high background noise, Level 1 is high sensitivity for low background noise.
Dual Watch (TDR - Menu 07): Monitors both A and B segments. If a signal is received, the scan stays on that channel.
Power Save (SAVE - Menu 08): Turns off the transceiver when no signal is received to conserve battery power.
Time Out Timer (TOT - Menu 09): Prevents excessively long transmissions by blocking transmission after a preset time (30-180 seconds).
Busy Channel Lockout (BCL - Menu 10): Prevents transmission on an already busy channel.
Call Tone Select (RING - Menu 11): Choose from 10 different call tone signals to identify your radio.
Voice Selection (VOICE - Menu 12): Enable or disable voice prompts, and select language (Chinese/English).
Restore Factory Settings (RESET - Menu 13): Resets all radio parameters to factory defaults.

Maintenance Features:

General Care: Treat the radio with care as it is a precision electronic product. Avoid opening the radio, as this will void the warranty. Do not store in direct sunlight or hot, dusty, or dirty areas. Keep the radio dry.
Battery Charging: The Li-ion battery pack is not charged at the factory and should be charged before use. For optimal performance, fully charge/discharge the battery two or three times initially. Use only the specified Retevis charger. Charge in ambient temperatures between 5℃-40℃ (40°F - 105°F). Turn off the radio before charging. Do not interrupt the charging cycle until the green light indicates full charge. Avoid recharging a fully charged battery. Do not charge a damp battery or radio.
Battery Storage: Store the battery at approximately 80% discharged in a low-temperature, dry environment, away from hot places and direct sunlight.
Safety Precautions: Do not short-circuit battery terminals or throw batteries into fire. Do not attempt to remove the casing from the battery pack. Avoid placing the radio near airbags or in areas sensitive to electromagnetic radiation (hospitals, aircraft, blasting sites). Turn off the radio when refueling or at gasoline service stations. Do not transmit without an antenna.
Troubleshooting Guide: The manual includes a comprehensive troubleshooting guide for common issues like the radio not turning on, weak/intermittent voice, inability to communicate, unknown voices/noise, and continuous transmission.
Approved Accessories: Use only Retevis-approved accessories to ensure compliance with RF exposure guidelines and maintain warranty.