Radio Shack 920SR User Manual
216MH z
user guide
920SR speaker
921T body-worn transmitter
922T handheld transmitter
923C charging stand
contents
introduction . . . . . . . . . . . . . . . . . . . . . . .1
understanding sound field . . . . . . . . . . . .2
setup tips . . . . . . . . . . . . . . . . . . . . . . .3-5
daily operating tips . . . . . . . . . . . . . . . .6-8
parts and accessories included
with system . . . . . . . . . . . . . . . . . . . . . 9 -10
920SR column speaker features . . .11-14
921T body-worn transmitter features . .15-16
922T handheld transmitter features . . . .17
923C charging stand features . . . . . . . . .18
system setup and operation . . . . . .19-28
920SR speaker placement
and mounting . . . . . . . . . . . . . . . . . . .29-34
921T body-worn transmitter
operation . . . . . . . . . . . . . . . . . . . . . . . .35-40
922T handheld transmitter
operation . . . . . . . . . . . . . . . . . . . . . . . .41-46
aux in – connecting to
TV, CD, VCR, etc. . . . . . . . . . . . . . . . . . . . . .47
aux out – connecting to
personal devices . . . . . . . . . . . . . . . . .48-49
additional system accessories . . . . . . 50- 51
troubleshooting . . . . . . . . . . . . . . . . . 52- 53
Radium channel numbers and
corresponding frequencies . . . . . . . . . . . . 54
product specifications . . . . . . . . . . . . . 55 -5 7
warranty . . . . . . . . . . . . . . . . . . . . . . 58-60
regulatory approvals and clearances . .61-64
introduction
Congratulations on the purchase of your new Radium sound field system! With proper care
and use it will become one of your most valuable classroom educational tools. Students will
be able to consistently and easily understand the teacher, regardless of their location in the
classroom, or competing internal or external background noise. Teachers can now speak all
day in their normal voice without having to raise their voice to get their students’ attention.
Numerous studies show that classrooms using sound field enjoy better student comprehension, increased student participation, better grades and fewer behavioral referrals.
Read this manual carefully to become familiar with your system and to get the most out of
its many features and options.
1
understanding sound field and its benefits
without sound field
• distance
• noise
• echo
• distance
• noise
• echo
?
?
cough!
with sound field
2
setup tips
IMPORTANT!
Be sure you place your Radium speaker and transmitter units on their charger overnight –
for a minimum of 12 hours – before turning the power on and/or using them for the first
time. Failing to do so can reduce battery capacity.
Basic setup tips
First – Identify a front corner of the room – the location from where the teacher
normally teaches.
Second – Take a good look around, paying close
attention to power outlet and other electronic
equipment locations. Ideally, the speaker should
be placed at a 5-foot distance from other electronic equipment, such as computers or radios.
Third – Determine whether to mount the
speaker on the wall as shown in diagram 1, or
place it on a sturdy surface using the T-bar table
3
diagram 1
setup tips (cont’d)
mount stand in diagram 2. In either case,
diagram 2
the speaker should be placed at a height of
3 feet/1 meter from the floor, or at level
closest to the listener‘s ears.
Fourth – Consider whether other Radium,
EasyListener 2, or other radio-based active
learning systems are in use in the building,
and set transmitter and receiver channels
accordingly. Every transmitter in a building
should be on its own channel. See
diagrams in section 12 for guidance.
If placing the speaker on a table or surface top, consider the following:
• Choose a location that provides easy access for the teacher, and is out of
the way of students and main traffic areas. The speaker should be placed at
least 6 feet/1.8 meters away from where the teacher stands.
4
setup tips (cont’d)
• Choose a table or surface top that is sturdy.
Make sure the table or cabinet is structurally solid, sturdy and out of the way of foot traffic.
• Properly mount and securely fasten the T-bar speaker stand onto the bottom
of the speaker. Make sure the stand is screwed on tightly, and that the speaker does
not wobble when in an upright position.
If mounting on the wall, consider the following:
• The power supply cord needs to reach the wall outlet. Make sure the power
supply is within reach of the speaker from its wall-mounted position.
• The teacher should be able to reach the controls located on top of the speaker
once it’s mounted. Once the volume is set at a comfortable level, the speaker power
switch located on the lower right side of the speaker can be easily accessed by the
teacher. Follow the instructions on page 28 for setting the volume at the proper level.
• Never mount the speaker upside down, or horizontally. The speaker unit must be
mounted such that the controls are located at the top of the unit.
5
daily operating tips
In the morning –
• Turn transmitter power ’on’ and put microphone on.
• Turn speaker column power ’on’. The speaker should remain plugged into a wall
power outlet during the day – with the power in the ‘on’ position. Turn power switch
to the ‘off’ position at night after each use. The internal battery is not being used while
the speaker is plugged into a wall outlet.
• To operate using the internal battery as a portable system, simply unplug the
speaker before use and plug back in after use – making sure you return power switch
to ‘off’ position while plugged-in and charging. The battery takes 6 hours to reach a full
charge; at full charge, the speaker column battery will last up to 8 hours unplugged.
In the evening after each use –
• Turn transmitter power ’off ’, and place it back onto the charg ing stand; confirm
that the ‘charge’ indicator light illuminates. Transmitters not in use should always be
placed on the charging stand – this is their home base station.
• Turn speaker column power ’off ’. Leave speaker plugged into wall power outlet,
but confirm that the power has been turned ‘off.’
6
daily operating tips (cont’d)
Battery care and maintenance tips –
• The speaker battery will last approximately 2 years depending on usage.
• When not in use, leave speaker plugged into wall outlet with power switch in
‘off’ position.
• Keep speaker away from heating units – use/store in a cool dry place.
• When using speaker battery power (unplugged from wall), always remember to return
power switch to ‘off’ position after use.
• Never mount/use speaker horizontally or upside down. Controls should be accessible
from top of unit.
• Plan on buying new NiMH batteries for your transmitter every 12 months. Alkaline
batteries can also be used as back-ups, however, the 923C charger will not recharge
alkaline batteries. Never attempt to recharge alkaline batteries – this will cause damage
to the unit and void the product warranty.
• Remember to charge all batteries overnight before initial use.
7
daily operating tips (cont’d)
Do not coil the microphone – since it also acts as your antenna, coiling or wrapping the
cord will affect its range and may also reduce its life.
Speak at a normal level – the system is projecting your voice for you.
8
parts and accessories included with system
1
2
3
4
and/
or
5
6
7
8
or
9
9
10
11
12
13
1 column speaker receiver
(920SR)
2 body-worn transmitter
(921T)
and/or
handheld transmitter
(922T)
3 plug-in mic for body-worn transmitter
(AT0655 shown)
4 charg ing stand
(923C)
5 power supply, receiver
(040-7402-106)
6 power supply, charging stand
(AT0819)
7 receiver antenna
(AT0831)
8 speaker table stand
(AT0823)
or
wall mounting bracket (set of 2)
(AT0820)
9 elastic belt
(AT0712)
10 AA rechargeable NiMH batteries
(AT0807)
11 channel changer screwdriver
(330-3000-101)
12 auxiliary input/output cable
(AT0532-05)
13 auxiliary input cable (3.5mm– dual RCA)
(300-6332-107)
10
920SR column speaker features (top)
11
8 9
1
2 4 6 7
3
5
10
11
12
1 power, low battery, and
reception status indicator
for channel A
2 power switch and volume
control for channel A
7 aux output level switch
See page 42 for level setting chart
8 antenna
9 wall mount hole
3 reception status indicator for
channel B
4 power switch and volume
control for channel B
5 tone control
6 aux input volume control
10 extra antenna hole (not used)
11 aux input jack (3.5mm, mono)
12 aux output jack (3.5mm, mono)
12
920SR column speaker features (front and back)
13
20
13
14
15
16
18
17
19
13 speaker grille
19 power jack
14 two built-in speakers
15 internal rechargeable battery
(non-user removable)
16 handle
17 main power on/off switch
18 power and charging indicator
20 channel selectors
14
921T body-worn transmitter features
15
front
back
3
1
4
2
921T body-worn transmitter features (cont’d)
top
5
6
1 belt clip
2 battery compartment
3 volume control
4 channel selector
5 microphone input (2.5mm)
6 3 position power switch
7
on
standby
(mute)
off
7 power and low battery indicator light
16
922T handheld microphone features
1 LED indicator light
2 3 position power switch
1
2
3
on
(mute)
3 channel selector
offstandby
4 battery compartment
4
5 channel selector key
(inside battery compartment)
5
17
923C charging stand features
front
1 power indicator
2 pocket 1 charg ing indicator
3 pocket 1 full charge indicator
1
3 4 5
2
4 pocket 2 charg ing indicator
5 pocket 2 full charge indicator
back
6 power switch
7 DC power socket
6
7
18
19
1
system setup and operation
attach antenna
Attach antenna to top of speaker
1
2
1
2
Turn metal base of antenna clockwise until secured tightly (do not
over-tighten)
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