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RT28 Manual
Function Introduction
◆Frequency
FRS 462.5625~462.7125，462.5500 ~462.7500 MHz （RX/TX）
◆ Up to 16 Channels
◆ Commercial FM radio
◆ 50 Groups CTCSS，105 Groups of standard DCS
◆ Time-out timer(TOT)
◆ Battery saving function
◆ Alarm function
◆ USB rapid charge
◆ Programmable by PC
Item Description
Note:
The radio outlook based on the real radio.
A.LED Indicator: Green LED flashes when receive the signal, Red LED flashes when transmission.
B. Channel knob: Rotate the knob to choose the channel (CH1-CH15), CH16 is scan channel.
C.ON/OFF knob/Volume knob: Rotate the knob clockwise to turn on the radio, anticlockwise to turn off the radio.
By rotating to control the volume.
D.PTT switch: Press PTT and speak to the microphone to call, listen when release.
E. Monitor: When press Monitor key, the squelch opened and the background noise comes out; the squelch close when release the
monitor key.
F.USB Rapid charge plug.
G. Speaker/Microphone rubber plug: Please cover when not use the speaker and microphone.
H. Insert loudspeaker.
J. Microphone
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Table of Contents
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Summary of Contents for Retevis RT28
- Page 1 RT28 Manual Function Introduction ◆Frequency FRS 462.5625~462.7125，462.5500 ~462.7500 MHz （RX/TX） ◆ Up to 16 Channels ◆ Commercial FM radio ◆ 50 Groups CTCSS，105 Groups of standard DCS ◆ Time-out timer(TOT) ◆ Battery saving function ◆ Alarm function ◆ USB rapid charge ◆...
- Page 2 Battery Charging 1.Take out the charger, plug the AC（100-240V）50/60Hz, then Green LED flashes; 2. Plug the battery or the radio with battery on the charger; make sure the battery is connected with the charger. 3. The charging process initiates when the red LED lights, the charging time based on the battery capacity. The green LED lights indicating the battery is fully charged.
- Page 3 and receive the week signals. Battery Saving a.ON: Entering into the battery saving state automatically without any operation for 10 seconds, b.OFF: Battery saving is off. Busy Channel Lockout (BCL) Switch on or off each effective channel busy lockout function via PC programming software. Whenopen this setting, signal from the curr ent channel is banned to transmit.
- Page 4 Modulation sensitivity 8—12mV Transmission current ≤1.2A Receiver: Sensitivity -122dBm (12dB SINAD) Audio power 0.4W（8R Load） Audio distortion ≤10% Intermodulation ≥60dB Adjacent channel selectivity ≥60dB Clutter suppression ≥65dB Receiver current ≤380mA Center frequency Center frequency Channel No. Channel No. (MHz) (MHz) 462.5625 462.7125 462.5875...
- Page 5 exposure compliance requirements to be exceeded. – This transmitter may operate with the antenna(s) documented in this filing in Push-to-Talk and body-worn configurations. RF exposure compliance is limited to the specific belt-clip and accessory configurations as documented in this filing and the separation distance between user and the device or its antenna shall be at least 2.5 cm.
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