Retevis RB27 Handheld GMRS Transceiver

Product Documentation

Document	Pages	Notes
External Photos	4
User Manual	25

Product

Parameter	Value	Description
Form Factor	Handheld	The radio is designed to be held in one hand while in use.
Type	Transceiver	The radio can receive and transmit signals.
Width	2.25 in	The distance between the left and right surfaces of the main body of the radio, excluding protrusions.
Height	5.1 in	The distance between the top and bottom surfaces of the main body of the radio, excluding protrusions.
Depth	1.2 in	The distance between the front and rear surfaces of the main body of the radio, excluding protrusions.
Weight	8.6 oz	The mass of the main body of the radio, including the removable battery or removable front panel.
Operating Temperature	-20 to 60 °C	The range of temperatures in which the product is designed to be operated.

Tuning System

Parameter	Value	Description
Channel Capacity	30 max	The number of memory channels that can be programmed into the radio.
Channel Bandwidth	12.5 kHz	The radio's tuning system supports channel spacing of 12.5 kHz.
Dual Watch	Yes	The radio can monitor two frequencies at the same time.
Scan Type	Channel	The radio's tuning system can scan some or all of the channels programmed into its memory.
Repeater Capable	Yes	Memory channels can have different transmit and receive frequencies, facilitating the use of radio repeaters.

Signaling System

Parameter	Value	Description
CTCSS Tones	50	The number of distinct CTCSS tones supported by the radio.
DCS Codes	208	The number of distinct DCS codes supported by the radio.
Emergency Call	Yes	Sends out a distress call to other radios. May also place the radio in hands-free mode to so the user can describe his situation without needing to continually press the PTT button.

Audio System

Parameter	Value	Description
Output Power	1 W max
Voice Prompts	Yes

Receiver

Parameter	Conditions		Value	Description
	Tuning System	Receiver
	Channel Bandwidth	SINAD
Personal Bands			FRS	Family Radio Service (462.550 - 467.7125 MHz)
Personal Bands			GMRS	General Mobile Radio Service (462.550 - 467.725 MHz)
Broadcast Bands			FM	FM broadcast band (88 - 108 MHz)
Broadcast Bands			WX	NOAA weather broadcast band (162.400 - 162.550 MHz)
Amateur Bands			2m	Amateur 2-meter band (144.000 - 148.000 MHz)
Amateur Bands			70cm	Amateur 70 cm band (420.000 - 450.000 MHz)
LMR Bands			VHF	Land mobile VHF high band (150 - 174 MHz)
LMR Bands			UHF	Land mobile UHF band (450 - 470 MHz)
Marine Bands			VHF	Marine VHF band (156.050 - 162.025 MHz)
Marine Bands			UHF	Marine UHF Band (457.5125 - 457.5875 and 467.5125 - 467.5875)
Operating Frequency			88 to 108 MHz	The range of frequencies that can be tuned by the receiver.
			136 to 174 MHz
			400 to 520 MHz
Sensitivity Threshold		12 dB	0.25 µV max	The magnitude of the smallest RF signal that a receiver can detect.
Adjacent Channel Selectivity	12.5 kHz		55 dB min	The ability of a receiver to discriminate between a desired signal and an undesired signal in an adjacent channel.
Spurious Rejection	12.5 kHz		57 dB min	The ratio of a receiver's response to a signal at a desired frequency and its response to signals at other frequencies that cause a response.
Intermodulation Rejection	12.5 kHz		55 dB min	The ability of a receiver to reject intermodulation products produced by the mixing of two or more signals at the input to the receiver.
Audio Distortion			5 % max

Transmitter

Parameter	Conditions	Value	Description
	Tuning System
	Channel Bandwidth
Personal Band		GMRS	General Mobile Radio Service (462.550 - 467.725 MHz)
Frequency Drift		2.5 ppm	The amount that a transmitter's frequency varies from its nominal value.
Output Power		5 W max	The maximum RF power that a transmitter can produce, as reported by the manufacturer in product documentation.
Measured Power		3.08 W max	Actual output power measured by a telecommunication certification body (TCB) and reported to the Federal Communications Commission.
Adjacent Channel Power	12.5 kHz	-60 dB max
Emission Type	12.5 kHz	11K0F3E	11 kHz occupied bandwidth, FM analog voice
VOX		Yes
Busy Channel Lockout		Yes	Indicates that a transmitter can be prevented from operating when a receiver detects activity on the tuned frequency.
Timeout Timer		Yes	Indicates that a radio is capable of limiting the length of each transmission.

Volume Control

Parameter	Value	Description
Location	Top	The volume control is located on the top of the radio.
Type	Rotary Knob	The setting can be adjusted by rotating a round knob.

Squelch Control

Parameter	Value	Description
Location	Menu	The squelch level can be adjusted through the radio's menu system.

Keypad

Parameter	Value	Description
Lockable	Yes	The keypad can be configured in a way that disables the function of most keys.
Audible	Yes	The keypad can be configured to emit a sound each time that a key is pressed.

Display

Parameter	Value	Description
Backlit	Yes	The display device is illuminated for better readability in poor lighting conditions.

Antenna Port

Parameter	Value	Description
Impedance	50 Ω

Battery

Parameter	Value	Description
Charge Capacity	1500 mAh	The amount of charge stored in a fully-charged battery.
Energy Capacity	11.1 Wh	The amount of energy stored in a fully-charged battery.
Type	Li-Ion	Lithium Ferrous Phosphate (LiFePO4)
Voltage	7.4 V	The nominal voltage of a battery.
Low Voltage Alert	Yes	The device alerts the user when the battery voltage falls below a threshold.
Charging Method	USB-C

Bonus Features

Parameter	Value	Description
LED Flashlight	Yes	The radio contains an LED that can be switched on to provide a small amount of task lighting.