Instruction Manual
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Copyright © 2020 RCA Communications Systems www.RCACommunicationsSystems.com
Communications Systems
RDR42x0 Professional Digital
Two-Way Radios
INSTRUCTION MANUAL
Attaching / Removing the Belt Clip
Use the 2 screws (M2.5x8.0) supplied with the radio and insert these
screws through the holes in the radio clip and into the holes in the
aluminum case. If you want to remove the clip from the radio, just
unscrew them, and remove the clip. You can put the screws back into
the radio to make sure you do not lose them. (See Figure 4)
Programmable Buttons
Your RCA Communications Systems Dealer can program the
programmable buttons as shortcuts to radio functions or preset
channels/groups depending on the duration of a button press:
Short Press - Press and release quickly.
Long Press - Press and hold for the programmed duration (between 1
seconds and 3.75 seconds).
Connecting Audio Accessories
Open the cover of the connector for external speaker/MIC, and
then insert the plug of the external speaker or microphone onto the
connector socket of the radio. When screwing the accessory plug,
make sure it is properly aligned (straight) to ensure the right connection
to the connector of the radio. (See Figure 5)
All Alert Tones On/O - Toggles all tones and alerts on or o.
Emergency On - Initiates an emergency alarm or call.
Emergency O - Cancels an emergency alarm or call.
Nuisance Delete - Temporarily removes an unwanted channel, except the
Selected Channel, from the scan list. The Selected Channel refers to the
user’s selected zone/channel combination from which scan is initiated.
High/Low Transmit Power - Toggles transmit power level between high
and low.
Monitor On/O - Monitors a selected channel for activity.
One Touch Access - Directly initiates a predefined Private or Group Call,
a Call Alert or a Quick Text message.
Scan On/O - Toggles scan on or o. Tight/Normal Squelch -
Toggles squelch level between tight and normal squelch levels.
Privacy On/O - Toggles privacy (basic voice encryption) on or o.
VOX On/O - Toggles Voice Activated Function on or o.
Lone Worker On/O - Toggles Lone Worker feature On or O, on per
channel basis.
Zone Toggle (RDR4220) - Toggles between Channel Zone 1 and Channel
Zone 2.
Battery Indicator (RDR4220) - Indicates battery charge level, low,
medium or high.
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Turn On/O the Radio
1. Rotate the On/O/Volume Control Knob clockwise until you hear a
click. The LED blinks orange and a brief tone sounds, indicating that
the power up test is successful. The RDR4250 & RDR4280 radio
displays “RCA RDR42X0
DMR Radio” when powered up.
2. To turn o the radio, rotate the knob counterclockwise until you hear
a click.
Note: There is no power up tone if the radio tones/alerts function is
disabled. If your radio does not power up, check your battery. Make
sure that it is charged and properly attached. If your radio still does not
power up, contact your RCA Communications Systems dealer.
Adjusting the Volume
To increase the volume, turn the On/O/ Volume Control Knob
clockwise. To decrease the volume, turn this knob counterclockwise.
Select A Channel
Rotate the Channel Selector Knob to the desired channel. or to switch
between channels. Channels can be configured as analog or digital
channel. Your radio has features that are available in both analog and digital
mode. The minor dierences in the way each feature works does not aect
the performance of your radio.
Programmable Functions
Adjust Power Level Nuisance Delete
Adjust Squelch Level One Touch Call 1
All Alert Tones On/O One Touch Call 2
Accessory Link Audio Switch One Touch Call 3
Channel Down One Touch Call 4
Channel Knob Disable One Touch Call 5
Channel Up One Touch Call 6
Contact List Preset Channel1
Emergency Alarm Ack Preset Channel2
Emergency O Preset Channel3
Emergency On Preset Channel4
Encrypt On/O Record Delete
Favorite Contact List Record Play/Play Next/Play Stop
Group Call Alert Repeater/Talk Around
Home Screen Scan On/O
Keypad Lock Squelch On/O
Lone Worker On/O Surveillance/Covert Mode
ManDown On/O VOX On/O
Manual Dial For Private Zone Down
Momentary Monitor Zone Toggle (RDR4220)
Monitor Zone Up (RDR4220)
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