Okayo C 7192C User manual

Okayo Wireless Audio Link System Okayo Wireless Audio Link System
Operating Instructions
C 7281A UHF Dual Channel Wireless Link Receiver
C 7282A UHF Wireless Link Transmitter
C 7192C Dynamic Handheld Transmitter
C 7193C Condenser Handheld Transmitte
C 7195C Beltpack Transmitter
WARRANTY
Distributors warrants this product for 1 year from date of purchase or its resellers to the consumer.
During the warranty period, we undertake to repair or replace your product at no charge if found to be defective due to
a manufacturing fault. The warranty excludes damage by misuse or incorrect installation (i.e. failure to install and
operate device according to specifications in the supplied instruction manual), neglect, shipping accident, or no fault
found, nor by use in a way or manner not intended by the supplier.
For repair or service please contact your PLACE OF PURCHASE.
If this item was purchased directly from Altronics please make a warranty claim by:
1. FOR MAIL ORDER CUSTOMERS (includes school and trade orders),
a) Ringing us on 1300 797 007 and quoting your tax invoice number.
b) Upon contacting Altronics, we will issue an R.A. (Return Authorisation).
As Altronics have a number of service agents throughout Australia, a copy of the R.A. will be emailed, faxed or
mailed to you with full instructions of how and where to send the goods. The freight for shipping goods back to
Altronics for all repairs is at the customer’s expense.
c) A copy of the R.A. form, (or at the very minimum, the R.A. number) must accompany the goods to effect the
repair.
d) Altronics will pay the return freight to the customer where the warranty claim has been accepted.
e) Please quote the R.A. number in any correspondence to us.
2. FOR OVER THE COUNTER PURCHASES to make a warranty claim, please return the goods to us in any of our
stores, with a copy of your proof of purchase (tax invoice).
a) Upon leaving the goods at one of our stores, an R.A. number will be issued to you.
b) Once repaired, you will be contacted, advising that the goods are ready to be collected from the store.
It is at Altronics discretion as to whether the goods will be repaired or replaced (whilst under warranty); and as to
whether identical goods will be used to replace the item due to changes of models / products.
Note: Under no circumstances should you attempt to repair the device yourself or via a non-authorised Altronics
service centre, as this will invalidate the warranty! Our goods come with guarantees that cannot be excluded under the
Australian Consumer Law. You are entitled to a replacement or refund for a major failure and for compensation for any
other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods
fail to be of acceptable quality and the failure does not amount to a major failure.
Revision Date: 27/3/2015

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The C 7281A and C 7282A wireless receiver and transmitter combination provides an ideal solution for extending a PA
system to a nearby building where cabling is impossible or impractical to install.
The desktop transmitter accepts a standard paging microphone or line level feed from the existing PA system and
transmits it to the receiver unit in the remote location. This then feeds the signal into the amplifier at that location.
This allows any program source fed into the primary amplifier to be relayed to the remote PA system. Ideal for both
permanent or temporary installations such as PA systems at carnivals, sporting events, mine sites, construction sites,
agricultural shows etc. Transmission range up to 100m line of sight in ideal conditions.
Setup
The C 7281A receiver unit integrates with the “C” series Okayo handheld & beltpack lavalier transmitters for use as a
standard UHF wireless system for direct connection to an amplifier. It may also be used with Okayo portable PA units
fitted with the C 7189C wireless link transmitter.
When used with the C 7282A transmitter it allows you to send the audio signal from one PA system to another without
the use of cables (up to 100m away - in ideal conditions). See Fig. 1 below:.
Receiver Operation (C 7281A)
Switch on/Switch off
• Turn Channel A / B knob (2) / (5) clockwise until a click occurs. The LCD will then display the text “On”. After a few
seconds, the LCD window will show a channel number and a signal strength.
• Turn Channel A / B knob (2) / (5) counter clockwise until a click occurs. The screen will then show “OFF” for about
three seconds, and then go dark.
Setting and Selection of Channels:
NOTE: Channel A and Channel B cannot be set with the same channel number at the same time.
• Press and hold SET (4) to enter the channel selection mode. If Channel A is on, the channel number of Channel A
that is shown on the screen starts to blink. Press the Up or Down Frequency arrows (3) to choose your preferred
channel number. Press SET again to confirm the channel setting.
• Perform the same process on Channel B after switching that channel on.
• If you don’t press any button on the panel within 10 seconds, the receiver will exit the channel setting mode and
retain the channel number.
70 - 100m
Amplier Amplier
Figure 1: Extending a PA system Wirelessly
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Overall System
Carrier frequency range: ............520-544MHz (16 - 96 channels)
LCD indication: ....................................Channel, Signal strength
Frequency selection:................................SET, UP, DOWN Arrows
Frequency modulation............................................24MHz (max)
Dynamic range: ................................................................110dB
Total harmonic distortion: ..................................Less than 0.5%
Pre/de-emphasis: ................................................................50μs
Silent mode: ....................Tone key and noise lock dual-squelch
Frequency response: ..............................................70Hz - 17kHz
Range: ..........................................................................70-100m
C 7281A Receiver Unit
Antenna connection: ............................................................TNC
Audio output: ..........................6.35mm jack, 3 pin XLR balanced
Output level:......................XLR: 1V / 600 Ω (@AF input 300 mV)
Hi: 730 mV / 2k Ω (@AF input 300 mV)
Low: 80 mV / 2k Ω (@AF input 300 mV)
Power supply: ..........................................12V DC. 0.6A plugpack
Size: ......................................................210D x 215W x 44Hmm
Weight ................................................................................1.2kg
C 7282A Transmitter Unit
Antenna connection: ............................................................TNC
Audio input: ........6.35mm jack, 3 pin XLR balanced, stereo RCA
Audio output:..................Stereo RCA & 6.35mm headphone jack
RF output: ....................................................................10-30mW
Aux input: ........................................................................700mV
Aux output:..............................................................................1V
Mic input sensitivity: ..........................................................10mV
Headphone output:......................................................0.5W/32Ω
Power supply: ............................................12V d.c. 1A plugpack
Size: ......................................................214D x 187W x 44Hmm
Beltpack Transmitter (C 7195C)
Mic Insert: ..................................................................Condenser
RF Output: ........................................................................10mW
Spurious Emission:........................................................<250mW
Audio Input: ..........................................................Mic in, Aux in
AF Controls: ..................................Mute switch, hi/mid/lo switch
Battery: ............1.2V NiMH rechargeable x 2 or 1.5V Alkaline x 2
Operating Life (fully charged) 11 hrs (NiMH) or 14 hrs (Alkaline)
Dimensions: ......................................................88 x 64 x 24mm
Weight (with batteries):........................................................170g
Handheld Transmitters (C 7192C/C 7193C)
Mic Insert C 7192C: ......................................................Dynamic
Mic Insert C 7193C:....................................................Condenser
RF Output: ........................................................................10mW
Spurious Emission:........................................................<250mW
AF Controls: ....................................................Hi/lo/mute switch
Battery: ............1.2V NiMH rechargeable x 2 or 1.5V Alkaline x 2
Operating Life (fully charged) 11 hrs (NiMH) or 14 hrs (Alkaline)
Dimensions: ..........................................................46Ø x 264mm
Weight (with batteries):........................................................280g
Specfications
IMPORTANT
Maintenance / Operation Guidelines
Avoid excessive heat: Do not leave units in direct sun for extended periods, in front of heaters or any source of
high temperature
Avoid rough handling: Transmitter or receiver may be damaged if dropped
Remove batteries: Remove batteries from transmitters when not in use.
Replace batteries: Ensure replacement batteries are the same or equivalent to existing. Batteries may explode
under charge or unit may malfunction if incorrect batteries are used.
Battery terminals: Ensure battery contacts are clean and free of corrosion before operation. If corrosion occurs it
could be a sign of faulty batteries. Return to your place of purchase if service is required.
C 7282A Transmitter
C 7281A Receiver

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2
1
4567
3
DC INPU T
12 1 5 V/ 0 . 6A
1. Power switch
2. Receiver module (see Fig. 2 detail)
3. Antennae A & B TNC connectors
4. Balanced 3 pin XLR output
5. Unbalanced 6.35mm jack output
6. Low/high impedance switch for
6.35mm output
7. DC power input socket
15
4
3
2
Fig. 2: Receiver Controls
1. LCD screen
2. Channel A power switch and volume control
3. Up/Down frequency selector
4. Frequency set buttons
5. Channel B power switch and volume control
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Table 1: UHF Wireless Channel Guide
Fig. 3: Receiver Front
and Rear Panel
Display of Frequency Value:
Press either the Up or Down arrows on the Frequency Selector and the frequency value of Channel A or B will be
displayed for two seconds before reverting back to showing the channel number.
Scan - Searching for available channels automatically:
1. Press Up and Down arrows (3) together for more than a second. The LCD window will show “Scan” without
blinking.
Channel A and Channel B will be switched to any available channels automatically. If there is no channel available,
the current channel numbers will remain the same.
2. Using two UHF Duo wireless receiver modules simultaneously:
• Set the group number as F2 for these two wireless receiver modules.
• Wireless Receiver Module 1 will search for available channel automatically as described in step 1.
• Switch on the Transmitter used for Wireless Receiver Module 1 and adjust the channel number accordingly.
• Wireless Receiver Module 2 will search for available channel automatically.
• Switch on the Transmitter used for Wireless Receiver Module 2 and adjust the channel number accordingly.
Setting of Group Number and SQ Value:
1. Press Set (4) and then switch on Channel A or Channel B to enter Group setting. The LCD window would show
‘F1’ (number will keep blinking).
2. Press Up or Down arrow buttons (3) to look for your preferred group number.
3. Press SET to confirm the group setting or wait for five seconds to confirm it automatically and then enter setting
mode of SQ value.
4. Under setting mode of SQ value, LCD window will show ‘F2’ (number will keep blinking).
5. Press Up or Down arrows to choose SQ value. The value will not be set in circulation.
6. Press SET again to confirm the group setting or wait for five seconds to confirm it automatically and then back to
normal switching-on mode.
520-544MHz Frequency
1520.1 17 542.4 33 538.3 49 526.7 65 524.8 81 522.4
2543.9 18 523.9 34 536.2 50 534.3 66 536.5 82 542.6
3532.1 19 537.6 35 543.7 51 540.8 67 523.2 83 526.9
4525.1 20 530.6 36 529.9 52 520.5 68 534.9 84 535.6
5537.9 21 542.1 37 524.4 53 535.3 69 527.3 85 540.3
6522.8 22 523 38 538.1 54 529.1 70 541.4 86 531.8
7535.1 23 532.5 39 521.3 55 539.6 71 524.1 87 540.1
8527.5 24 528.9 40 533.5 56 530.4 72 533.9 88 525.6
9541.6 25 541 41 521 57 543.1 73 529.6 89 538.7
10 521.5 26 520.7 42 531.2 58 522 74 540.6 90 530.1
11 533.3 27 531 43 522.6 59 532.3 75 526.2 91 527.1
12 523.5 28 525.4 44 537 60 528.4 76 543.3 92 531.5
13 536.8 29 542.9 45 525.8 61 537.3 77 523.7 93 533
14 526 30 522.2 46 541.8 62 521.7 78 534.1 94 527.7
15 539.4 31 534.6 47 528.7 63 543.5 79 528.2 95 539.8
16 529.4 32 524.6 48 539.1 64 530.8 80 535.8 96 533.7
Frequency Combinations 520-544MHz
1. Use 4 channels at the same time
(1)12405 (2)67810 (3)09111213 (4)15161718
(5) 19 21 22 25 (6) 26 27 28 29 (7) 35 36 37 39 (8) 62 63 64 65
2. Use 8 channels at the same time
(1)12456131619 (2)3536373839414446
3. Use 12 channels at the same time
(1)1245613161920212534 (2)353637383941444647535455

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Receiver Connection (C 7281A)
See Fig. 4.
Connection to your amplifier or mixer unit can be made via the 6.35mm unbalanced AF Out jack or 3 pin XLR
balanced AF Out socket. Connect the output of the receiver to the input of your amplifier or mixer with an appropriate
lead.
The 6.35mm AF Out socket is provided with a high/low impedance switch. This switches between 80mV and 700mV
impedance.
• If connecting to a MIC input jack, select LOW. If connecting to a line or aux input jack select HIGH.
• If using an XLR MIC jack, connect it from XLR balanced AF Out to a mixer or amplifier AUX IN socket, which might
be XLR or a phono TRS jack.
AF Impedance Selection (HI / LOW Control)
Remark: The AF impedance selection only controls the Unbalanced AF Out connection (6.35 mm).
In order to prevent the impedance being too high thus producing unexpected noise, please set the impedance switch
at LOW if you are connecting a jack to a low level input in the subordinate device.
If your subordinate device is configured with a general input socket (e.g., LINE IN, AUX IN , etc), please set the
impedance switch to HI to avoid a low-volume output.
Transmitter Operation (C 7282A)
See Fig. 5 & 6.
1. Press the main power switch on and turn power switch/AF level knob clockwise to turn the transmitter unit on.
2. The LCD screen will display ‘ON’ then revert to the factory default channel (or the channel last selected).
3. To select a channel press the SET button. Using the UP/DOWN frequency adjustment buttons you can set the
transmitter to match the channel used by the receiver (C 7281A).
4. Adjust the AF level to the desired position.
5. The module is now ready to transmit signal to the receiver unit (C 7281A). When transmitting audio the TX indicator
will light green. The AF indicator displays audio level when users are speaking into a mic or music is playing.
In addition individual transmission indicators are provided for wired mic input and aux/line input (number 3 & 5
respectively on Fig. 6). These will illuminate whenever signal from each input is being transmitted.
6. A stereo phone jack and level control is provided on the front panel for local monitoring of aux/line input signal).
3 Pin XLR Lead
AMPLIFIER
Mic IN Line IN
AUDIO MIXER
WIRELESS
RECEIVER
Line OUT
SPEAKER
Fig. 4: Receiver Connection To Amplifier/Mixer
AMPLIFIER
SPEAKER
Mic IN Line IN
AUDIO MIXER
WIRELESS
RECEIVER
Line OUT
6.35mm Stereo jack Lead
C 7192C and C 7195C Transmitter Troubleshooting
• Power LED does not illuminate after pressing power switch.
Check batteries are charged and inserted correctly.
For handheld microphone, when pressing power switch ensure you hold it down for 2-3 seconds.
• LCD shows “Err” when switching off.
Contact your place of purchase for information on resetting your transmitter.
• LCD panel displays garbled information.
Remove batteries and re-insert them.
• No sound output
Check frequency of transmitter is the same as the receiver.
Check volume level of both transmitter and receiver.
For beltpack transmitter, ensure mute button is not activated.
Ensure transmitter is within range of the receiver.
Check for sources of interference, large metal objects etc. within range of the transmitter.
• Signal disturbance.
When operating two transmitters in the same area, ensure frequencies selected are several channels apart. This
helps to reduce crosstalk between transmitters. Also note that other wireless devices can cause interference,
ensure you adjust your frequency around these devices where possible.
Fig. 11: Mounting C 7281A & C 7282A In 19” Racking
A. Two units side by side mounting.
B. Single unit mounting
Or

Okayo Wireless Audio Link System Okayo Wireless Audio Link System
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1. 2. 3. 4. 7.6.
Fig. 5: Transmitter Module
1. LCD screen
2. TX transmitting indicator
3. AF transmitting indicator
4. AF audio level indicator
5. Frequency set button
6. Up/down frequency adjustment buttons
7. Power switch & AF level control
5.
1. Power switch
2. Wired mic volume
3. Wired mic transmission indicator
4. Aux/Line input volume
5. Aux/line input transmission indicator
6. Transmitter module (see Fig. 5)
7. Headphone volume
8. 6.35mm headphone jack
9. Antenna TNC connector
10. Aux/Line stereo RCA output
11. Aux/Line stereo RCA input
12. Balanced 3 pin XLR input
13. Condenser mic p/supply selector (5V)
14. 6.35mm jack input
15. DC power loop output socket
16. DC power input socket
1. 2. 3. 4. 5. 7.6. 8.
9. 10. 11. 12. 13. 15.14. 16.
4.
5.
6.
7.
8.
9.
10.
3.
2.
1.
Fig. 10: Beltpack UHF Wireless Transmitter (C 7195C)
1. Aerial
2. Mute button (top)
3. On/off switch (top)
4. Mini XLR 3 Pin input socket (top)
5. LED power indicator
6. Sensitivity selection switch (side)
7. 3.5mm aux input socket (side)
8. Frequency set button
9. Up/down frequency adjustment buttons
10. Charging jack
C 7195C Lavalier Beltpack Transmitter - Figure 10.
1. Ensure microphone is switched off before inserting batteries.
2. Remove battery clip. Insert two AA batteries (alkaline or rechargeable’s are recommended).
3. Press the top mounted power button to switch to ON. The power LED will illuminate red and ‘ON’ will be displayed
on the LCD screen. repeat this to switch OFF
4. A selection switch on the side of the beltpack provides three level settings (low, mid & high) depending on the appli-
cation or environment in which it is to be used. The mute button allows beltpack to be put on standby without
switching the power off.
5. The LCD screen will display the channel selected. To determine which frequency this channel is operating on, press
the UP or DOWN frequency adjustment buttons.
6. Press the frequency set button for one to two seconds. The LCD screen will flash the currently selected channel
number. You can cycle through the channels by pressing the UP or DOWN frequency adjustment buttons. Press the
frequency set button again to lock in your channel selection.
7. The battery status is displayed on the left of the screen. When battery capacity is critical the icon will flash three
times before switching the microphone off automatically.
8. When using with rechargeable NiMH batteries, you can use the C 7196A charging pod. This allows you to put up to
two beltpacks on charge at the same time. Charging time is dependant on the capacity of batteries used, typically
10-12 hours charging is required. If battery icon is flashing when charger is connected, ensure rechargeable batter-
ies are inserted in the microphone. If batteries have failed both the battery icon and screen backlight will flash.
During normal charging the battery icon will cycle through the charge “bar” icons. Once full capacity is reached the
full battery icon and all “bars” will be displayed.
Fig. 6: Transmitter Front & Rear Panel

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3 Pin XLR Lead
AMPLIFIER WIRELESS
TRANSMITTER
6.35mm Lead
SPEAKER
LINE OUTPUT
CD PLAYER (Or other line/aux source)
BALANCED
MIC INPUT
UNBALANCED
MIC INPUT
Fig. 7: Transmitter Connection To Amplifier/Mixer and Audio Sources
Transmitter Connection (C 7282A)
See Fig. 7.
The wireless transmitter can be connected to a local line level input source via stereo RCA connection. Two
microphone inputs are provided via balanced 3 pin XLR and unbalanced 6.35mm jack connection. A stereo RCA loop
output is fitted, this may be connected to a local zone amplifier input.
A 5V phantom power switch for condenser microphones may be selected on the 6.35mm jack input.
Transmitter Microphone Operation
C 7192C/C7193C handheld microphone and C 7195C lavalier beltpack transmitter may be used in conjunction with the
C 7281A receiver unit. Transmitter microphones are sold separately.
C 7192C Handheld Microphone Transmitter - Figure 9.
1. Ensure microphone is switched off before inserting batteries.
2. Remove lower housing and battery clip. Insert two AA batteries (alkaline or rechargeable’s are recommended).
3. Press and hold the power switch for a few seconds (located on the base of the microphone). The power LED will
illuminate red and ‘ON’ will be displayed on the LCD screen. Note: power switch is more easily accessed with lower
housing removed.
4. A selection switch on the rear of the microphone provides three level settings (mute, mid & high) depending on the
application or environment in which it is to be used. Mute setting allows microphone to be put on standby without
switching the power off.
5. The LCD screen will display the channel selected. To determine which frequency this channel is operating on, press
the UP or DOWN frequency adjustment buttons.
6. Press the frequency set button for one to two seconds. The LCD screen will flash the currently selected channel
number. You can cycle through the channels by pressing the UP or DOWN frequency adjustment buttons. Press the
frequency set button again to lock in your channel selection.
7. The battery status is displayed on the left of the screen. When battery capacity is critical the icon will flash three
times before switching the microphone off automatically.
8. To turn the microphone off press the power switch for a few seconds until the LCD screen displays ‘OFF’
9. When using with rechargeable NiMH batteries, connect a DC 5V plugpack (Altronics M 8909A plus M 9187 tip
adaptor) to the charging port on the base of the microphone. Charging time is dependant on the capacity of
batteries used, typically 10-12 hours charging is required. If battery icon is flashing when charger is connected,
ensure rechargeable batteries are inserted in the microphone. If batteries have failed, both the battery icon and
screen backlight will flash.
10. During normal charging the battery icon will cycle through the charge “bar” icons. Once full capacity is reached
the full battery icon and all “bars” will be displayed.
Note: Microphone is unable to be used during charge process.
1. 2. 4. 6.5.
3.
Figure 9: Handheld UHF Wireless Microphone (C 7192C/C7193C)
1. Protective screen head
2. Rubberised body
3. Frequency set button
4. LCD screen
5. Up/down frequency adjustment buttons
6. LED power indicator
7. Power switch
8. Charging port connection
8.7.