RD-21
FM RDS/DAB digital radio
Please read this manual before use
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Controls
(Top)
1
2
3
4
5
6
7
8
9
10 11
12
13 14
15
18
17
16
1. Telescopic aerial (on rear)
2. On/Off button
7. Auto Tune button
8. Headphone socket
9. FM/DAB button
13. Tuning Up button
14. Tuning Down button
15. Tuning control
16. Station presets
17. Bass control
3. Mains LED indicator
4. Treble control
10. Line out socket
11. Info/Menu button
12. Select button
5. Liquid crystal display (LCD)
6. + 5 button
18. Volume control
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Battery operation
1. Remove the Battery cover on the rear of the unit by pushing the
battery door in and downwards.
2. Insert six LR20 (D size) batteries into the spaces in the compartment.
Takecaretoensureallbatteriesareinsertedwiththecorrectpolarityas
shown inside the battery compartment. Replace the battery cover.
3. Reduced power, distortion and a ‘stuttering’ sound are all signs that
the batteries may need replacing.
4. If the radio is not to be used for any extended period of time it is
recommended that the batteries are removed from the radio.
We would recommend for economy that the RD-21 is used on the
mains whenever possible with battery operation for occasional or
stand-by use only.
IMPORTANT: The batteries should not be exposed to excessive heat
suchassunshine,fireorthelike.Afteruse,disposablebatteriesshould
if possible be taken to a suitable recycling centre. On no account
should batteries be disposed of by incineration.
Mains operation
1. Place your radio on a flat surface.
2. Plug the mains lead into the Socket located on the rear of your radio
ensuring that the plug is pushed fully into the socket.
3. Plug the other end of the mains lead into a wall socket and switch on
the wall socket.
IMPORTANT: The mains plug is used as the means of connecting the
radio to the mains supply. The mains socket used for the radio must
remain accessible during normal use. In order to disconnect the radio
from the mains completely, the mains plug should be removed from
the mains socket outlet completely.
4. When the mains LED is on, it indicates that the radio is connected to
and powered from the mains supply.
3
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Operating your radio - DAB
1. Fully extend the telescopic aerial.
2
2. Press the On/Off button to switch on your radio. The display will show
"Welcome to DAB" for a few seconds.
3. If this is the first time the radio is used a quick scan of the UK band
III DAB channels will be carried out.
4. During Autotune as each group of stations is detected the bottom
line of the display will show a bargraph indicating progress of the
Autotune.
5. WhentheAutotuneiscompletethefirststation(innumeric-alphaorder
0...9...A....Z) will be selected.
6. If the station list is still empty after the Autotune you radio will display
"No stations available".
7. If no signals are found it may be necessary to relocate your radio to
a position giving better reception.
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4
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Selecting a station - DAB
1. The top line of the display shows the name of the station currently
selected.
2. Rotate the Tuning control or press the Up or Down buttons to scroll
through the list of available stations.
2
3. Press and release the Select button to select the station. The display
may show "Now Tuning" while your radio finds the new station.
2
2
4. Adjust the Volume and Tone controls to the required settings.
Note:Ifafterselectingastationthedisplayshows"Stationnotavailable"
it may be necessary to relocate your radio to a position giving better
reception.
3
4
4
4
5
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Secondary services - DAB
1. Certainradiostationshaveoneormoresecondaryservicesassociated
with them. If a station has a secondary service associated with it the
display will show ">>" next to the station name on the station list. The
secondary service will then appear immediately after the primary
service as you rotate the Tuning control.
1
2. Totunetothesecondaryservice,pressandreleasetheSelectbutton.
Mostsecondaryservicesdonotbroadcastcontinuallyandiftheselected
service is not available, the radio will retune to the associated primary
service.
2
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Display modes - DAB
Your radio has seven display modes:-
1. Press the Info/Menu button to cycle through the various modes.
1
a
b
a. Scrolling text
b. Program Type
c. Multiplex Name
d. Time and date
Displays scrolling text messages such as
artist/track name, phone in number etc.
Displays the type of station being listened
to e.g. Pop, Classic, News etc.
Displays the name of DAB multiplex to
which the current station belongs.
c
Displays current the time and date.
d
7
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e. Frequency
Displays the frequency of the DAB
multiplex for the station listened to.
e
f. Bit rate & audio type
Displays the digital bit rate & audio type
for the station being listened to.
f
g. Signal Error
Displays the signal error for the station
being listend to.
g
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Finding new stations - DAB
As time passes new stations may become available. To find new stations
proceed as follows:-
1
2
1. Press and release the AutoTune button, the display will show "Scan-
ning". Your radio will perform a scan of the UK DAB frequencies. As
new stations are found the station counter on the right-hand side of
the display will increase and stations will be added to the list
2. To carry out a full scan of the entire DAB band (band III) press and
hold down the AutoTune button for more than 2 seconds and then
release. The display will show "Scanning". As new stations are found
the station counter on the right-hand side of the display will increase
and stations will be added to the list
Signal strength display - DAB
1. Press and release the Select button to switch between the current
1
information display and the signal strength indication.
2. Position your radio and carefully angle the telescopic aerial for best
receptionusingthesignalstrengthdisplayasa guide. Moveyourradio
aroundandpositionsoastogivemaximumnumberofblackrectangles
on signal strength display. The clear unfilled rectangle indicates the
minimum signal level required for satisfactory reception.
9
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Manual Tuning - DAB
Manual tuning allows you to tune directly to the various band III DAB chan-
nels. UK DAB stations are currently located in the range 11B to 12D.
1
1. Press and hold down the Info/Menu button and rotate the Tuning
control or press the Up or Down buttons until the display shows
"Manual Tune". Press and release the Select button.
2. Rotate the Tuning control or press the Up or Down buttons to select
the required DAB channel.
1,2
3. Press and release the Select button. The open block in the signal
strength graph shows you the minimum signal strength needed for
good DAB reception. The signal blocks will go up and down showing
the changing signal strength as you adjust the telescopic aerial or the
radio position.
4. Press and release the Select button to return to normal tuning
mode.
1
1,2
1,2
3,4
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Dynamic Range Control (DRC) settings - DAB
The DRC facility can make quieter sounds easier to hear when your radio
is used in a noisy environment.
1. Press the On/Off button to switch on your radio.
1
2. Press and hold down the Info/Menu button and rotate the Tuning
control or press the Up or Down buttons until the display shows
"DRCvalue". PressandreleasetheSelectbuttontoenteradjustment
mode.
2,3
2
3. Rotate the Tuning control or press the Up or Down buttons to select
2,3
the required DRC setting (default is 0).
DRC 0 DRC is switched off, Broadcast DRC will be ignored.
DRC 1/2 DRC level is set to 1/2 that sent by broadcaster.
DRC 1 DRC is set as sent by broadcaster.
4. PressandreleasetheSelectbuttontoconfirmthesetting.Thedisplay
2,3
will return to normal tuning mode.
Note: Not all DAB broadcasts are able to use the DRC function. If the
broadcast does not support DRC, then the DRC setting in the radio will
have no effect.
2,4
11
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Station order setup - DAB
This function enables you to choose how the stations are arranged when
selecting a station. There are four options available - favourite station,
alphanumeric, active station and prune stations.
1
Note: Your radio default station order is numeric-alpha order.
1. PressandholdintheInfo/MenubuttonandrotatetheTuningcontrol
or press the Up or Down buttons until "Station order" appears on the
display.
1,3
2. Press and release the Select button.
3. Rotate the Tuning control or press the Up or Down buttons to
choose between favourite station, alphanumeric, active station and
prune stations.
1,3
4. Press and release the Select button to select the station order setting
1,3
required.
Favourite stations
When this setting is switched on, after a period of time the most listened
to stations will move to the top of the station list and will be marked with
the heart symbol
.
2,4
Alphanumeric
Rotate the Tuning control until "Alphanumeric" appears on the display.
Your radio will now select stations in alphanumeric order (0....9....A....Z).
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12
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Active station
When this setting is switched on the display will show only those that a
signal can be found for.
Prune stations
Some DAB services may stop broadcasting or you may not be able to
receive a station. Prune stations will delete the DAB stations from your
station list that can no longer be received.
When this feature is selected your radio will delete the stations that are
not currently being received.
13
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Operating your radio - FM
1. Carefully extend the telescopic aerial
3
2
2. Press the On/Off button to switch on your radio. The radio will tune
to the last selected radio station.
3. Press the FM/DAB button to select the FM band.
4
4. Press and release the Up button then press the Auto Tune button.
Your radio will search in an upwards direction (low frequency to high
frequency) and stop automatically when it finds a station of sufficient
strength.
7
5. If RDS information is being received, then after a few seconds the
display will update and show the radio station name.
4,6,7
6. To find other stations press the Auto Tune button as before.
7. If you press and release the Down button then press the Auto Tune
button,yourradiowillsearchinadownwardsdirection(highfrequency
to low frequency) and stop automatically when it finds a station of
sufficient strength.
9
9
9
8. When the end of the waveband is reached your radio will recommence
tuning from the opposite end of the waveband.
9. Adjust the Volume and Tone controls to the required settings.
10. To switch off your radio press the On/Off button.
10
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Manual tuning - FM
1. Press the On/Off button to switch on your radio.
2
1
2. Press and release the FM/DAB button to select the FM band. Fully
extend the Telescopic aerial.
3. Rotate the Tuning control or press the Up or Down buttons to tune
to a station. The frequency will change in steps of 50kHz.
3
4. When the end of the waveband is reached the radio will recommence
tuning from the opposite end of the waveband.
3
3
5. Set the Volume control and Tone controls to the desired settings.
6. To switch off your radio press the On/Off button.
5
5
5
6
15
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Display modes - FM
When listening in FM mode the bottom line of the display can be set to
any of the following modes:-
a
b
1. Press the Info/Menu button to cycle through the various modes.
1
a. Scrolling text
b. Program Type
Displays scrolling text messages such as
artist/track name, phone in number etc.
Displays type of station being listened to
e.g. Pop, Classic, News etc.
c
c. Time and date
d. Frequency
Displays current time and date.
d
Displays frequency of the station being
listened to.
FM Stereo/Mono
1. IftheFMradiostationbeingreceivedisweaksomehissmaybeaudible.
To reduce the hiss press and release in the Select button until the
display shows "Mono", your radio will switch to mono mode.
1,2
2. To return to stereo mode press and release in the Select button until
the display shows "Auto", your radio will switch to stereo mode.
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16
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Presetting stations - DAB and FM
There are 10 memory presets for each of the 2 wavebands.
1. Press the On/Off button switch on the radio.
2. Tune to the required station as previously described.
1
3
3. Press and hold down the required Preset button until the display
showse.g. Preset1saved.The stationwillbestoredunderthechosen
preset button. Repeat this procedure for the remaining presets.
4. Presets 6 to 10 are obtained by pressing and holding +5 button
together with the Preset button 1 to 5. e.g preset 7 can be set by
pressing and holding +5 button together with Preset button 2 until
the display shows Preset 7 saved.
4
5. Stations stored in preset memories may be overwritten by following
the above procedure.
4
17
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Recalling a preset station - DAB and FM
1. Press the On/Off button to switch on the radio.
2
1
2. Select the required waveband by pressing the FM/DAB button.
3. Momentarily press the required Preset button, your radio will tune to
the station stored in preset memory.
3
4. Presets 6 to 10 are obtained by pressing and holding +5 button and
Preset button 1 to 5. e.g preset 7 can be recalled by pressing and
holding +5 button followed by pressing Preset button 2.
4
4
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18
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System reset
If your radio fails to operate correctly, or some digits on the display are
missing or incomplete, if running on batteries first check that the batteries
are not exhausted. If you still suspect a problem with your radio please
carry out the following procedure.
1,2
1. InFMmode,pressandholddowntheInfo/Menubuttonfor2seconds.
The display will show "SELECT Factory reset".
2. In DAB mode, press and hold down the Info/Menu button and rotate
the Tuning control or press the Up or Down buttons until the display
shows "Select Factory reset".
2
2
2
3. Press and release the Select button until the display shows "Press
SELECT to confirm reset".
4. Press Select button again to confirm system reset.
5. A full reset will be performed all presets and station lists will be
erased.
3,4
6. After a system reset a scan of the DAB band will be performed.
In case of malfunction due to electrostatic discharge, reset the product
(reconnection of power source may be required) to resume normal
operation.
If a problem persists our technical staff would be pleased to help
offeranyassistanceonoperatingtheradio.Ourtechnicalhelpline
number is 020 8758 0338.
19
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Headphone socket
A3.5mm Headphone Socket located on the rear of your radio is provided
forusewitheitherheadphonesoranearpiece.Insertingaplugautomatically
mutes the internal loudspeaker.
IMPORTANT:Excessivesoundpressurefromearphonesandheadphones
can cause hearing loss.
Line out socket
A 3.5mm Line out socket located on the rear of your radio is provided
for connecting the audio signal to an external amplifier. Inserting a line out
audio cable will not mute the internal loudspeaker. Set the volume control
to minimum if desired.
Display backlight
1. When your radio is powered by batteries the display backlight will
be switched on for approximately 8 seconds when any button is
pressed.
2. When your radio is powered by AC mains the display backlight will
always be switched on when the radio is switched to on.
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20
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Software version
The software display cannot be altered and is just for your reference.
1. To view which software version your radio has press and hold in the
1
Info/Menu button.
2. Rotate the Tuning control or the Up and Down buttons until the
software version shows on the display.
2
2
2
21
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•
•
•
The radio should not be exposed to dripping or splashing and that
no objects filled with liquids such as vases, shall be placed on the
radio.
General
Do not allow this radio to be exposed to water, steam or sand. Do not leave
your radio where excessive heat could cause damage such as in a parked
car where the heat from the sun can build up even though the outside
temperature may not seem too high. It is recommended that the DAB band
beusedwhereverpossibleasbetterresultsintermsofqualityandfreedom
from interference will usually be obtained than on the FM band.
It is recommended to operate the product such that there is a minimum
distance (10cm recommended) to adjacent objects in order to ensure
good ventilation.
The ventilation of the product should not be restricted by covering it or
its ventilation openings with items such as newspapers, table-cloths,
curtains etc.
•
•
No naked flame sources such as lighted candles should be placed on
the product.
It is recommended to avoid using or storing the product at extremes
of temperature. Avoid leaving the unit in cars, on window sills in direct
sunlight etc.
•
The nameplate is located on the underside of your radio.
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22
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Specifications
Power Requirements
Mains
Circuit Features
Loudspeaker
AC 230 volts, 50Hz
6 x LR20 (D size)
only
2 x 79mm
3W
Batteries
Output Power
Battery Life
Up to 150 hours of listening for 4 hours
a day at normal volume using alkaline
cells.
Headphone socket
Line out socket
3.5mm dia
3.5mm dia
Aerial System
FM
Telescopic aerial
Telescopic aerial
Frequency Coverage
FM
87.5-108MHz
DAB
DAB
174.928 - 239.200MHz
23
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Mains supply
The RD-21 will operate from a supply of AC 230 volts, 50Hz
only.
The wire coloured BLUE must be connected to the terminal marked N or
coloured BLACK.
DO NOT cut off the mains plug from this equipment. If the plug fitted is
not suitable for the power points in your home or the cable is too short to
reachapowerpoint, thenobtainanappropriatesafetyapprovedextension
lead or adaptor. If in doubt consult your dealer.
The wire coloured BROWN must be connected to the terminal marked L
or coloured RED.
If nonetheless the mains plug is cut off, remove the fuse and dispose of
the plug immediately to avoid a possible shock hazard by inadvertent
connection to the mains supply.
If this product is not supplied with a mains plug, or one has to be fitted,
then follow the instructions given below:
IMPORTANT
DO NOT make any connection to the larger terminal which is marked
with the letter E or by the safety earth symbol
Green-and-yellow.
or coloured Green or
The wires in the mains lead are coloured in accordance with the following
codes :-
BLUE - NEUTRAL
BROWN - LIVE
Fuse
When replacing the fuse only a 3AASTAapproved to BS1362 type should
be used and be sure to re-fit the fuse cover.
IF IN DOUBT - CONSULT A QUALIFIED ELECTRICIAN.
Replacement fuse holders are available from Roberts Radio Technical
Services at the address shown on the rear of this manual.
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Notes
25
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Guarantee
This instrument is guaranteed for twelve months from the date of delivery to the original owner against failure due to faulty workmanship or component
breakdown, subject to the procedure stated below. Should any component or part fail during this guarantee period it will be repaired or replaced free
of charge.
The guarantee does not cover:
1. Damage resulting from incorrect use.
2. Consequential damage.
3. Receivers with removed or defaced serial numbers.
N.B. Damaged or broken telescopic aerials will not be replaced under guarantee.
Procedure:
Any claim under this guarantee should be made through the dealer from whom the instrument was purchased. It is likely that your Roberts' dealer
will be able to attend to any defect quickly and efficiently, but should it be necessary the dealer will return the instrument to the company’s service
department for attention. In the event that it is not possible to return the instrument to the Roberts' dealer from whom it was purchased, please contact
Roberts Radio Technical Services at the address shown on the rear of this manual.
If you need any further advice, please call our Technical Helpline on :-
26
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ROBERTS RADIO TECHNICAL SERVICES
97-99 Worton Road
Isleworth Middlesex
TW7 6EG
Technical Helpline :- 020 8758 0338 (Mon-Fri during office hours)
Issue 1
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