Uniden R4 User manual

LONG RANGE Radar/Laser Detector
User’s Manual
R4
© 2021 Uniden America Corporation
Irving, Texas
Issue 1, September 2021
Printed in Korea

CUSTOMER CARE
At Uniden®, we care about you!
If you need assistance, please do NOT return this product to your place of purchase
Save your receipt/proof of purchase for warranty.
Quickly find answers to your questions by:
• Reading this User’s Manual.
• Visiting our customer support website at www.uniden.com.
Images in this manual may differ slightly from your actual product.
DISCLAIMER: Radar detectors are illegal in some states. Some states prohibit
mounting any object on your windshield. Check applicable law in your state and
any state in which you use the product to verify that using and mounting a radar
detector is legal. Uniden radar detectors are not manufactured and/or sold with the
intent to be used for illegal purposes. Drive safely and exercise caution while using
this product. Do not change settings of the product while driving. Uniden expects
consumer’s use of these products to be in compliance with all local, state, and
federal law. Uniden expressly disclaims any liability arising out of or related to your
use of this product.

CONTENTS
CUSTOMER CARE.......................................................................................................... 2
R4 OVERVIEW .............................................................................................5
FEATURES ........................................................................................................................ 5
WHAT’S IN THE BOX ...................................................................................6
PARTS OF THE R4........................................................................................7
NON-KEY ELEMENTS .................................................................................................. 9
POWER CORD................................................................................................................. 9
OLED DISPLAY .............................................................................................................11
INSTALL AND TURN ON R4..................................................................... 12
INSTALL/POWER ON..................................................................................................12
Windshield ............................................................................................................12
Dashboard.............................................................................................................13
MENU SYSTEM......................................................................................... 13
BASIC OPERATIONS ................................................................................ 25
FEATURE DETAILS ................................................................................... 26
ALARM PRIORITIES.....................................................................................................26
ATTENUATION..............................................................................................................27
AUTO DIM......................................................................................................................28
Set DIM to Auto from the R4/Power Cord..................................................28
Congure Auto from MENU............................................................................28
AUTO MUTE/AUTO MUTE VOLUME.....................................................................29
BLOCK BLIND SPOT MONITOR SYSTEMS..........................................................29
DISPLAY FORMATS.....................................................................................................30
Mode Display .......................................................................................................30
Scan Display..........................................................................................................30
Time Display .........................................................................................................30
FREQUENCY DISPLAYS.............................................................................................30
GATSO RT3/RT4 FREQUENCY RANGES..............................................................31
MODES (HIGHWAY, CITY, AUTO, AND ADVANCED).......................................31
MEMORY QUOTA........................................................................................................32
MUTE MEMORY ..........................................................................................................33
POP MODE ....................................................................................................................34
RED LIGHT CAMERA POINT DELETE ...................................................................34
RED LIGHT CAMERA QUIET RIDE .........................................................................34

THREATS.........................................................................................................................35
USER MARKS (MEMORY POINTS).........................................................................35
USER-SET AUTO CITY SPEED..................................................................................35
MAINTENANCE........................................................................................ 35
MAINTAINING THE EQUIPMENT ...........................................................................35
UPDATING THE FIRMWARE/DATABASE .............................................................36
TROUBLESHOOTING............................................................................... 36
SPECIFICATIONS ..................................................................................... 36
FCC/IC COMPLIANCE .............................................................................. 37
FCC COMPLIANCE ......................................................................................................37
FCC INTERFERENCE STATEMENT..........................................................................38
FCC CAUTION...............................................................................................................38
FCC RADIATION EXPOSURE STATEMENT..........................................................38
IC COMPLIANCE..........................................................................................................39
ONE-YEAR LIMITED WARRANTY ........................................................... 39

- 5 -
UNIDEN
LONG RANGE RADAR/LASER DETECTOR
USER’S MANUAL
R4
R4 OVERVIEW
Uniden’s R4 is a top of the line Radar Detector with a built-in GPS feature. With
the R4, you can mark geographical points where you commonly encounter radar
transmissions. These can be school zones, red-light cameras, and places where police
frequently monitor traffic. You can mark these points so the detector will announce
“User mark ahead” when you approach them. Among other announcements, the
Voice Notification feature lets you know when you are approaching a radar and what
type of radar it is (red light, speed, etc).
FEATURES
• Super Long Range Laser Radar Detection for X, K, Ka, POP, MRCD/T, and Gatso
RT3/4.
• Remote keypad (Optional)
• MRCD/T (Alert priority: Laser, MRCD, Ka, K, X) with customizable tones
• Quiet Ride MRCD/T on and off
• Voice Notifications
• Radar band frequency displays
• GPS for Red Light and Speed camera locations
• Up to 1750 GPS lockouts (Mute Memory points)
• Easy to read OLED display
• User Mark alarm with set and voice notification
• Advanced K and Ka band filters
• Undetectable Spectre I and IV
• Displays Signal Strength and Vehicle Battery Voltage
• Max. Speed Warning System
• Red light camera on/off and point delete
• X, K, MRCD/T, Ka, and Laser band selectable alert tones
• K, Ka Bogey tones (Alert tones 1 - 5)
• X, K, and Ka band user-defined sensitivity levels in Advanced mode
• Auto mute volume levels (Off, On: 0 - 7)
• Ka Frequency Voice Alert

- 6 -
• Auto Dim
• POI Database Save/Update (Maximum: 20,000 points)
• POI Passchime On/Off
• 8 Compass Directions
• Laser Gun ID
• Overspeed Alert Mute
• Keep K Block Filter ON to block K band monitor systems
• Mute Memory save, alarm
• Volume Adjust (0 - 8)
• Auto Mute Memory
• Two Low Noise Amplifiers (LNA)
WHAT’S IN THE BOX
R4 Radar
Detector
12V DC Cigarette
Adapter with
Mute Key and
RJ11 Jack
Single-Suction
Bracket
Dual-Suction
Bracket
Not Shown:
Hook and Loop Fastener Tape
Carry Case
Data Cable
Owner’s Manual

- 7 -
PARTS OF THE R4
Audio
Jack
Power
Jack
POWER
VOL +
MENU
VOL −
USB
Eagle
Eye
Latch
Slot
MUTE/DIM
MARK
Latch
Release
Aux
Jack
KEY PRESS TO... PRESS AND HOLD TO ...
POWER Turn R4 on and off. NA
VOL + Turn volume up (9 levels: 0 - 8; Default = 4).
In Menus, go to next item.
Quickly turn volume up or
down.
VOL – Turn volume down (9 levels: 0 - 8; Default
= 4).
In Menus, go to previous item.
MENU Access the Menu system.
In Menus, press to cycle through options
for the current menu item.
When in Menu mode, exit
the Menu system.
When NOT in Menu mode,
changes modes between
Highway, City, Auto, and
Advanced.

- 8 -
KEY PRESS TO... PRESS AND HOLD TO ...
MUTE/
DIM
MUTE
MUTE on - Press MUTE/DIM to mute
an alarm. Returns to normal operation
10 seconds after the alert ends or if a
different band is detected during Mute
mode. Mute On displays for a few
seconds.
MUTE off - Press MUTE/DIM to restore
audible alarms before the 10 second
automatic mute time-out.
MUTE MEMORY
Save a Mute Location (Mute Memory) -
press MUTE/DIM again while Mute On
displays to save that GPS location and
frequency to memory. Mute Memory
displays on the screen.
R4 stores up to 1750 Mute Memory
points. The R4 shares 2,000 points
between Mute Memory and User Marks
as set in the Memory Quota menu.
Delete Mute Memory - Press MUTE/
DIM while Mute Memory displays; the R4
displays a delete confirmation message.
Press MUTE/DIM again to confirm.
MUTE RED LIGHT CAMERA VOICE ALERT
Mute the voice alert for a red light camera
alarm. Press MUTE/DIM while the voice
alarm for a red light camera sounds. The
voice alarm mutes.
MUTE ALERTS FOR POI OVERSPEED ALERT
AND USER LIMIT SPEED
When R4 alerts you to an overspeed or
speed limit situation (an alarm sounds and
the alert displays), you can press MUTE/
DIM to silence that alarm.
DIM - Changes the
display and key backlight
brightness:
Auto (Default). Set 2
automatic time periods
and brightness levels for
the OLED display (see page
22).
Bright
Dim
Dimmer
Dark (Dark is off unless
there is alert.)
Off (Off regardless of
whether or not there is
an alert.)
DURING RED LIGHT
CAMERA ALERT
Press and hold MUTE/
DIM to delete the red light
camera point.
RED LIGHT CAMERA POINT
DELETE
When R4 alerts you to a
red light camera (the alert
displays), you can press
and hold MUTE/DIM to
delete that camera point.
After confirming this
deletion, R4 will not give
an alert for that camera.

- 9 -
KEY PRESS TO... PRESS AND HOLD TO ...
MARK User Mark. A User Mark is a manually
tagged geographic location where an
alarm is usually found. The R4 alerts when
close to these User Marks.
Add - Press MARK when you are at the
alarm location.
Delete - Press MARK when you are at an
alarm location that has been marked.
An error message displays/sounds if
memory is full or there is a GPS error.
Delete all User Marks.
NON-KEY ELEMENTS
ELEMENT WHAT IS DOES
Eagle Eye Provides a 360° monitoring radius.
Latch Slot Insert the bracket latch into this slot.
Mini USB Provides PC connection for data updates.
Audio Jack Plug in headset.
Eject Press to release the bracket latch.
Power Jack Plug the 12V Power Cord here.
Signal Strength Displays received signal strength (5 levels).
POWER CORD
USB port
MUTE
button
LED
RJ11 port

- 10 -
ELEMENT WHAT IT DOES...
MUTE
button
(Although
not labeled,
press
and hold
MUTE to
access DIM
functions)
• Press the MUTE button to mute an alarm. Returns to normal
operation 10 seconds after the alert ends or if a different band is
detected during Mute mode. Mute On displays on the R4 for a few
seconds.
• Save a Mute location (Mute Memory) - press the MUTE button
again while Mute On displays on the R4 to save that GPS location
and frequency to memory. Mute Memory displays on the screen.
R4 stores up to 1750 Mute Memory points. The R4 shares 2,000
points between Mute Memory and User Marks as set in the
Memory Quota menu.
• Delete Mute Memory - Press the MUTE button while Mute
Memory displays on the R4; the R4 displays a delete confirmation
message. Press the MUTE button again to confirm.
• Red Light Camera Point Alert Mute/Delete - When R4 alerts you
to a red light camera (the alert displays), you can press MUTE
to mute or delete (press and hold) that camera point. After
confirming this deletion, R4 will not give an alert for that camera.
• Mute Overspeed Alarms - When R4 alerts you to an overspeed or
speed limit situation (an alarm sounds and the alert displays), you can
press MUTE to silence that alarm
• Press and hold the MUTE button to change the display and key
backlight brightness.
DIM function. Press and hold for DIM options to display on the
OLED. Press the button again to scroll through and select one of the
following options:
• Auto (Default; see page 22 to set OLED brightness levels and
start times and page 28 for Auto Dim feature description.)
• Bright
• Dim
• Dimmer
• Dark (Dark is off unless there is alert.)
• Off (Off regardless of whether or not there is an alert.)
Dim level cannot be changed during a Red Light Camera alert.
LED (Red) • Off: Power is off.
• Steady on: Power is on.
• Flashing: Receiving an alert. The faster it flashes, the stronger the
signal.

- 11 -
ELEMENT WHAT IT DOES...
USB Port Use this USB port to charge mobile devices.
OLED DISPLAY
The OLED display on the front of the unit changes depending on what events are
happening.
If GPS = ON, the OLED’s left display area shows the display selected in the menus
(see page 21).
If GPS = Off, the OLED’s left display area shows Volt regardless of user settings.
The following table provides examples of the most common OLED displays.
OLED EXAMPLES MEANING
Scanning for Frequencies
mph
42
H
Displays to indicate
end of a scan cycle.

Information displayed in example:
• Speed (mph or km/h)
• Wave
• Heart icon (end of search cycle)
• Highway/City/Auto/Advanced
Frequency Found
(Display Style #1)
V
12.8 Ka 33.800
(Display Style #2)
V
12.8 Ka 33.800 GHz
Lorem ipsum
Information displayed:
• Band type Type (X, K, KA)
• Frequency number
• Voltage
• Status Area (Mute Memory, Quiet Ride, etc)
• Signal strength indicator bar
Speed Camera Alarm
mph
5 8
270 ft
S p e e d
Information displayed:
• Current speed in mph/km/h
• Distance to speed camera
• Speed camera icon
Red Light Camera Alarm
mph
5 8
270 ft
Information displayed:
• Current speed in mph/km/h
• Distance to red light camera
• Red light camera icon

- 12 -
OLED EXAMPLES MEANING
User Mark Detected
mph
5 8
620 ft
Information displayed:
• Current speed in mph/km/h
• Distance to user mark
• User mark icon
Time Display (Scan Display
Off)
mph
58
P
M
11:45
H
Information displayed:
• Speed
• Time and AM/PM
• Highway/City/Auto/Advanced mode
Quiet Ride Display
Display Style #1
mph
45 K24.120
Q-Ride
Display Style #2
mph
45 K 24.120
GHz
Q-Ride
Information displayed:
• Current speed in mph/km/h
• Band type Type (X, K)
• Frequency number
• Status Area (Q-Ride displays)
• Signal strength indicator bar
Dark Mode Set mode to Dark if the unit’s OLED is not
anticipated to change a lot to prevent image
burn-in (Auto Dim setting).
In Dark mode, the OLED is dark with a single
white dot in the lower corner that moves from
bottom left to center to bottom right. The
movement of the dot confirms that the unit is
still powered up.
INSTALL AND TURN ON R4
You can mount the R4 on the windshield (1- and 2- cup suction brackets included) or
on the dashboard (hook and loop tape included).
INSTALL/POWER ON
Windshield
When you mount the R4 on the windshield, mount it in the middle of the windshield
between the driver and passenger. Be sure there are no obstructions and that there
is a clear view through the windshield.

- 13 -
1. Attach the rubber suction cups to the bracket and push the cups firmly onto the
windshield.
2. Slide the unit onto the bracket until it clicks into place.
3. Plug the power cord RJ11 connector into the R4 and plug the cigarette lighter
adapter into the vehicle’s cigarette lighter.
4. When the vehicle turns on, the R4 automatically turns on and runs through a
self test cycle.
Release the R4 from the bracket by pressing the Eject key on top of the detector.
Dashboard
The same types of mounting requirements for the windshield apply for mounting the
unit on the dashboard.
1. Attach the unit to the dashboard using the hook and loop fastener tape.
Be careful not to cover any air vent holes with the hook and fastener tape.
2. Plug the power cord RJ11 connector into the R4 and plug the cigarette lighter
adapter into the vehicle’s cigarette lighter.
3. When the vehicle turns on, the R4 automatically turns on and runs through a
self test cycle.
Pull the unit from the dashboard, separating the hook and loop tape.
MENU SYSTEM
Menus let you set up the system to your own requirements. You can turn different
bands on and off and set specific items such as speed or auto mute.
Press MENU to access the Menu system. The screen displays the selection’s current
status. For example, if you press MENU and the screen displays Voice: ON, you have
the option of turning Voice to OFF.
Use the following keys to navigate the menus:
• MENU : Change a menu item setting (press and hold to exit the Menu system).
• VOL + : Go to the next Menu item.
• VOL – : Go to the previous Menu item.
The R4 menu system is 2-tiered; Basic and Expert. Basic level menus let you set basic
elements such as red light camera alarms, band announcement (voice), and how you
want the OLED to appear (Alert Display #1 or #2 menu option, for example), among
other options. Expert level menus allow you to fine-tune your detector by activating
the traffic sensor filter, turning threat notifications on and off, or changing the colors
on the OLED screen, among other options.

- 14 -
In addition, GPS can be turned on and off only through the Expert menus. GPS status
also affects which menus may display in the Basic or Expert levels. For example, if
GPS is turned on, then the Speed Camera Alarm menus display. If it is not turned on,
then those menus will not display.
If a menu depends on Level, Mode, GPS , or a different status, that dependency will
be noted in the specific menu entry itself.
The following table lists all the menu options from all levels and modes.
Several menu items only display if GPS is set to ON. These entries are noted in the
following table.
MENU ITEM FUNCTION SETTINGS
Mode display Shows selected mode. Basic
Expert
Band Sensitivity
Selection
Changes band sensitivity as
follows:
Highway - Full Sensitivity
City - X and K sensitivity reduced.
Ka band sensitivity same as
Highway.
Auto - the R4 will automatically
switch between Highway and City
depending on the speed limits set
in the Auto City Speed menu. See
“Auto City Speed” on page 15
and page 35.
Advanced - User adjusts X, K, and
Ka band in decreasing sensitivity
from 100% - 30% in 10% intervals.
Advanced - Select Attenuation
levels for the X, K, and Ka bands.
See page 32 for details.
Highway (Default)
City
Auto
Advanced
X Band
Attenuation
(Basic and
Expert levels,
Advanced
modes only)
The higher the attenuation (100%)
the more signals, including weaker
signals, are received. Reduce
attenuation and the weaker
signals drop out, leaving only the
stronger signals.
100% (Default) ~ 30%
(In decreasing 10%
increments)

- 15 -
MENU ITEM FUNCTION SETTINGS
K Band
Attenuation
(Basic and
Expert levels,
Advanced
modes only)
The higher the attenuation (100%)
the more signals, including weaker
signals, are received. Reduce
attenuation and the weaker
signals drop out, leaving only the
stronger signals.
100% (Default) ~ 30%
(In decreasing 10%
increments)
Ka Band
Attenuation
(Basic and
Expert levels,
Advanced
modes only)
The higher the attenuation (100%)
the more signals, including weaker
signals, are received. Reduce
attenuation and the weaker
signals drop out, leaving only the
stronger signals.
100% (Default) ~ 30%
(In decreasing 10%
increments)
Auto City Speed Sets the speed at which the
R4 changes from City mode to
Highway mode and back.
10 - 60 mph (in 5 mph
units) or
10 - 100 km/h (in 10 km/h
units)
GPS
(Turn GPS
on and off in
Expert level
only)
Display current GPS status in Basic
level.
Turn GPS on or off in Expert level
only.
GPS determines your geographic
location and locates set frequency
locations in your area from a
database.
If GPS is turned on, other GPS-
related menu items display.
On (Default)
Off
Speed Camera
Alarm
(If GPS on)
Notifies you if any speed cameras
are nearby.
On (Default)
Off
Speed Camera
Alert Range
(If GPS on)
Sets range for speed camera
detection when Speed Camera
Alarm is On.
1000 ft (300 m) (Default)
2,000 ft (600 m)
2,500 ft (760 m)
3,000 ft (900 m)

- 16 -
MENU ITEM FUNCTION SETTINGS
Redlight
Camera Alarm
(If GPS on)
Notifies you if any red light
cameras are nearby.
On (Default)
Off
RLC Q-Ride
(If GPS on)
Red Light Camera Quiet Ride -
Mutes red light camera alarms if
you are driving below the speed
set here.
50 ~85 MPH (80 ~140
km/h)
Off (Default)
POI Passchime
(If GPS on)
Turns the alert chime off and on. On
Off (Default)
Voice
(If GPS on)
Turns voice alert on or off under
the following conditions:
Type of radar/laser
Band alarms
On (Default)
Off
Ka Frequency
Voice
Announces the detected Ka band
frequency.
On
Off (Default)
X Band Turn off to have the detector
ignore X band frequencies.
Turn on for X band sensitivity as
follows:
Highway: Full sensitivity
City: X and K bands sensitivity
reduced
On
Off (Default)
K Band Turn off to have the detector
ignore K band frequencies.
On (Default)
Off
Ka Band Turn off to have the detector
ignore Ka band frequencies.
On (Default)
Off
Laser Turn off to have the detector
ignore lasers.
On (Default)
Off
Laser Gun ID
(Expert level
only)
Turn on to display laser gun
identifier.
On
Off (Default)
K POP
(Expert level
only)
Detects K POP transmissions (very
brief transmissions, too fast for
some detectors to hear).
On
Off (Default)

- 17 -
MENU ITEM FUNCTION SETTINGS
MRCD/T Activates MultaRadar CD/CT low-
powered radar gun detection.
On
Off (Default)
Gatso RT3/4 Activates detection for Gatso
radar guns.
Gatso RT3/4 On
Gatso RT3/4 Off (Default)
Ka POP
(Expert level
only)
Detects Ka POP transmissions
(very brief transmissions, too fast
for some detectors to hear).
On
Off (Default)
K Filter
(Expert level
only)
Filters noise from the K band to
prevent false detections.
On (Default)
Off
Ka Filter
(Expert level
only)
Filters noise from the Ka band to
prevent false detections.
On
Off (Default)
TSF
(Expert level
only)
Traffic Sensor Filter. Prevents
false alarms caused by traffic
monitoring radar systems.
On
Off (Default)
K Block1 Filter
(Expert level
only)
Keep K Block1 Filter ON to block
K band monitor systems in the
24.199 (± 0.005) range.
On
Weak (Default)
Mute
Off
K Block2 Filter
(Expert level
only)
Keep K Block2 Filter ON to block
K band monitor systems in the
24.168 (± 0.002) range.
On
Weak (Default)
Mute
Off
K Narrow/
Wide/Extended
(Expert level
only)
K Wide and K Narrow scan for K
band radar guns used in the US
only. K Narrow scans a narrower
frequency range than K Wide.
K Extended increases the
frequency scanning range for K
band radar guns.
K Wide (Default)
K Narrow
K Extended

- 18 -
MENU ITEM FUNCTION SETTINGS
Ka Narrow/
Wide/
Segmentation
(Expert level
only)
Ka Narrow scans for Ka radar guns
used in the US only and reduces
false alarms. Ka Narrow also
provides a fast response to Ka POP
radar guns.
Ka Wide scans Super Wide Ka
band.
Ka Segmentation allows the user
to customize a Ka band sweep
from 9 filtered settings.
Ka Narrow (Default)
Ka Wide
Segmentation (Default
= On)
Ka 1 : 33.399 – 33.705
On/Off
Ka 2 : 33.705 – 33.903
On/Off
Ka 3 : 33.903 – 34.191
On/Off
Ka 4 : 34.191 – 34.587
On/Off
Ka 5 : 34.587 – 34.803
On/Off
Ka 6 : 34.803 – 35.163
On/Off
Ka 7 : 35.163 – 35.379
On/Off
Ka 8 : 35.379 – 35.613
On/Off
Ka 9 : 35.613 – 35.701
On/Off
Priority
(Expert level
only)
Sets whether Ka band signals have
priority over the strongest radar
signals for X, K, or Ka band, or
MRCD.
Laser alerts have priority over
radar alerts.
If MRCD on:
MRCD/Ka Priority
(Default)
Signal
Ka/MRCD
If MRCD off:
Signal
Ka
Mute Memory
Band
(If GPS on,
Expert level
only)
Select bands to be muted. X & K (Default)
X, K, Ka

- 19 -
MENU ITEM FUNCTION SETTINGS
Auto Mute
Memory
(If GPS on,
Expert level
only)
This menu turns the ability to
save mute requests for specific
locations/frequency bands on
and off.
On (Default)
Off
Auto Mute
Memory Band
Option Set
(If GPS on,
Expert level
only)
Auto Mute Memory Band Option
Set specifies which bands will be
muted.
X & K (Default)
X, K, and Ka
Threat
(Expert level
only)
Displays if more than one radar
signals are detected at the same
time. The signal with the strongest
radar signal is considered the
main signal; the other signals are
displayed on the left side (see
page 35).
All Threat On
All Threat Off (Default)
Background
Color
Select the color for the fixed
display elements on the OLED.
Blue
Amber
Green
Pink
Grey
Red (Default)
White
Purple

- 20 -
MENU ITEM FUNCTION SETTINGS
Band Color
(Expert level
only)
X Band
Signal setting matches signal
strength level color.
Signal (Default)
Red
Blue
Green
Orange
Yellow
White
Violet
K Band
Signal setting matches signal
strength level color.
Signal (Default)
Red
Blue
Green
Orange
Yellow
White
Violet
MRCD/T Band
Signal setting matches signal
strength level color.
When MRCD/T is on:
Signal (Default)
Red
Blue
Green
Orange
Yellow
White
Violet
Gatso RT3/4 Band:
Signal setting matches signal
strength level color.
When Gatso RT3/4 is on:
Signal (Default)
Red
Blue
Green
Orange
Yellow
White
Violet
Ka Band
Signal setting matches signal
strength level color.
Signal (Default)
Red
Blue
Green
Orange
Yellow
White
Violet