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18

2       CM-CU21 Mains Controls & Indicators

Talkback Buttons

The Talkback A and B buttons allow either of the two main commentators’ 
microphone signals to be redirected to the corresponding Talkback output. 
The associated Comm output is muted and the commentators’ signal is 
removed from the Mix Outputs. The four return audio inputs Prog, A, B and 
C function normally when a Talkback channel is active, allowing full-duplex 
communication between the commentator and a third party.

An alternative operating mode allows the Talkback B buttons to act as a 
temporary mute control for the Comm1, Comm2 and Talkback A outputs. 
The Talkback B buttons are ganged and the status of any active On Air or 
Talkback A channels is restored once both of the Talkback B buttons are 
returned to the off state. The Talkback B output is not used in this mode. 
See Configuration Options on Page 23 for details of how to change these 
settings.

These buttons have a momentary action by default; press to activate, 
release to deactivate. See Configuration Options on page 25  for details 
of how to change the button action. When a Talkback control is active, 
the button illuminates green and the corresponding open collector driver 
output on the GPIO port is activated.

Headphone Monitor Controls

The two main commentator positions have six sets of headphones 
controls which allow them to monitor all of units’ return audio and 
active commentator inputs. Each available input has an associated level 
adjustment potentiometer and a headphone channel selector switch. Each 
potentiometer provides a level adjustment from “full off” to “full on”, and 
the headphone channel selector determines which ear the associated 
signal is routed to; either the left, the right or to both ears when the switch 
is in the centre position. By default, the commentator input signals are 
only routed to the headphone monitor controls when the corresponding 
On Air control is active. It is possible to route each of these signals to the 

headphones permanently, regardless of the state of the corresponding On Air 
control. See Configuration Options on Page 24 for details.

The guest position, commentator 3, can be set to accept a line level input, and 
an additional option can be configured to prevent this signal from being routed 
to the commentator 1 and 2 headphone monitors.

The headphone controls for the third commentator position consist of left 
and right level adjustment potentiometers, and a switch to select the routing 
for the commentator input signals. With the switch in the left position, 
commentator 1 is heard in the left ear and commentator 3 is heard in the right 
ear. With the switch in the right position, commentator 2 is heard in the right 
ear and commentator 3 is heard in the left ear. When the switch is in the centre 
position, commentator 1 is heard in the left ear, commentator 2 is heard in the 
right ear and commentator 3’s own signal is heard in both ears.

Commentator 3 Line Input Level Control

When the third commentator input is set to accept a line input, this 
potentiometer sets the gain applied to the signal prior to being routed to the 
headphone monitor and main output channels. The gain range is -83dB to 
+10dB with a maximum input level of +25dBu.

PPM Meter Display

The 21 segment LED PPM meter display indicates the level of the signal on the 
mix outputs. The PPM scale conforms to IEC60268-10 11a and a dB scale is also 
shown. There are options to set the brightness level of the PPM meter, or it can 
be disabled if it is not required. See Configuration Options on Page 26 for 
details.

Limit LED

The limit LED illuminates when the adjustable limiter on the mix outputs is 
enabled and active. See Rear Panel Controls on Page 20 for details of how to 
enable and adjust the limiter. The colour and brightness level of the limit LED 
can be changed if required, see Configuration Options on Page 25 for details.

Summary of Contents for CM-CU1

Page 1: ...Manufacturers of audio video products for radio TV broadcasters Commentator Units CM CU1 Commentator Unit for 1 Commentator Line Input CM CU21 Commentator Unit for 2 Commentators 1 Guest HANDBOOK...

Page 2: ...e vendor Sonifex Ltd shall not be liable for any loss or damage whatsoever arising from the use of information or any error contained in this manual No part of this manual may be reproduced or transmi...

Page 3: ...tering Setup Mode 9 Changing The Current Page 9 Changing The Option Mode Setting 9 Config Page 1 ON AIR Button Enable Disable TALKBACK Button Latching Modes 9 Config Page 2 Line Input Routing to Outpu...

Page 4: ...ut Routing to Output 24 Config Page 3 Commentator Mic Line Input Routing to Headphones 24 Config Page 4 Miscellaneous 25 Config Page 5 Limit LED Colour Limit Power LED Brightness 25 Config Page 6 ON A...

Page 5: ...Of CM CU1 6 Fig 2 1 CM CU21 Commentator Unit 15 Fig 2 2 CM CU21 Commentator Unit Block Diagram 16 Fig 2 3 Top Panel View Of CM CU21 17 Fig 2 4 Front Panel View Of CM CU21 19 Fig 2 5 Rear Panel View O...

Page 6: ...w sonifex co uk Register Online for an Extended 2 Year Warranty As standard Sonifex products are supplied with a 1 year back to base warranty If you register the product online you can increase your p...

Page 7: ...duct has been registered at the Sonifex website when the Warranty Term is 24 months from the date of despatch the Contract means the quotation these Conditions of Sale and any other document incorpora...

Page 8: ...est and expense of the Purchaser the Company will test the Goods to ascertain performance levels and provide a report of the results of that test The report will be accurate at the time of the test to...

Page 9: ...d to look inside the unit always disconnect the mains supply before removing the equipment covers The cover is connected to earth by means of the fixing screws It is essential to maintain this earth g...

Page 10: ...03 along with the related Directive 2002 95 EC on Restrictions of the use of certain Hazardous Substances in electrical and electronic equipment RoHS The Waste Electrical and Electronic Equipment Dire...

Page 11: ...phones is also configurable to suit the application Four talkback output channels with a built in limiter are available to the commentator They have adjustable gain and can be linked to provide simult...

Page 12: ...2 1 CM CU1 System Diagram Fig 1 2 CM CU1 Commentator Unit Block Diagram...

Page 13: ...d towards the bottom ON AIR Button The ON AIR button routes the commentator microphone input signal to the Comm Output and to the Mix Output This button has a latching action press to activate and pre...

Page 14: ...er the left the right or to both ears when the switch is in the centre position By default the commentator input signal is only routed to the headphone monitor controls when the On Air control is acti...

Page 15: ...to 86dB is split into two to provide greater accuracy of adjustment The mic gain switch sets the base gain value of either 20dB or 50dB for the input The mic gain potentiometer can then be adjusted to...

Page 16: ...finger in the slot in the rear panel indicated by the ON AIR LOCK text on the top panel then slide your finger down the slot until you reach the pushbutton Fig 1 5 Rear Panel View Of CM CU1 Talkback...

Page 17: ...each output is shown below Comm 1 pulse Talkback A 2 pulses Talkback B 3 pulses Talkback C 4 pulses Talkback D 5 pulses The 5 return audio inputs function normally when the test tone is enabled This...

Page 18: ...tive open collector output 2 O TALKBACK A active open collector output 3 O TALKBACK B active open collector output 4 O TALKBACK C active open collector output 5 O TALKBACK D active open collector outp...

Page 19: ...Option Mode Setting Press the appropriate button once The number of flashes increases to indicate the new mode setting Once the maximum option mode setting has been reached the value wraps around to...

Page 20: ...when active default Mode 2 Limit indicator illuminates green when active Mode 3 Limit indicator illuminates red when active Mode 4 Limit indicator illuminates white when active This setting can be us...

Page 21: ...r 2 seconds These buttons will then illuminate red to verify that the options have been saved to backup set 1 To Save The Current Option Settings to Backup Set 2 Press and hold the ON AIR and TALKBACK...

Page 22: ...ximum Input Level 21dBu C M R R 55dB Frequency Response 0 5dB 20Hz to 22kHz Ref 0dBu 1kHz Transformer Balanced Mix Output Maximum Output Level Limiter Off 24dBu Frequency Response 0 5dB 20Hz to 22kHz...

Page 23: ...Rear Panel Operational Controls On Air Lock Switch to prevent On Air control from being deactivated Momentary push button to override on air lock T B Gang Switch to link operation of talkbacks A B C D...

Page 24: ...t XLR 4 pin male 12V DC 650mA Typical 850mA Maximum 24V DC 325mA Typical 425mA Maximum Earth Point M4 stud Equipment Type CM CU1 Commentator Unit 1 Presenter Physical Specification Dimensions Raw 270m...

Page 25: ...ommentators They have adjustable gain and can be linked to provide simultaneous operation A wide input gain range and switchable phantom power on each commentary position provides supports for a varie...

Page 26: ...16 2 CM CU21 System Diagram Fig 2 2 CM CU21 Commentator Unit Block Diagram...

Page 27: ...e a latching action press to activate and press again to deactivate When an On Air control is active the button illuminates red and the corresponding open collector driver output on the GPIO port is a...

Page 28: ...to the headphone monitor controls when the corresponding On Air control is active It is possible to route each of these signals to the headphones permanently regardless of the state of the correspond...

Page 29: ...has a three way switch that sets the input type When the switch is in the bottom position the input is a line level input With the switch in the centre position the input is for microphones not requi...

Page 30: ...ext on the top panel then slide your finger down the slot until you reach the pushbutton Limiter Controls The limiter enable switch and level potentiometer control the limiter that is applied to the m...

Page 31: ...in prior to entering test tone mode Talkback Controls The TALKBACK GANG switch links the operation of each of the commentator s TALKBACK A and B buttons When this switch is on pressing one of the TAL...

Page 32: ...ctive open collector output 2 O Commentator 1 TALKBACK A active open collector output 3 O Commentator 1 TALKBACK B active open collector output 4 O Commentator 2 ON AIR active open collector output 5...

Page 33: ...t PPM illumination level setting Changing The Current Page Press and hold the Commentator 3 On Air button for at least 1 second The PPM display will change to indicate the new page Changing The Option...

Page 34: ...ed to Commentator 1 headphones default Mode 2 Commentator 3 line mode input is not routed to Commentator 1 headphones Commentator 1 TALKBACK A button No associated option on this page Commentator 1 TA...

Page 35: ...on this page Commentator 2 ON AIR button Mode 1 Temporary muting of enabled ON AIR channels is disabled default Mode 2 Temporary muting of enabled ON AIR channels is enabled For this setting to be av...

Page 36: ...tton brightness level 3 Mode 4 ON AIR and TALKBACK button brightness level 4 Mode 5 ON AIR and TALKBACK button brightness level 5 Mode 6 ON AIR and TALKBACK button brightness level 6 Mode 7 ON AIR and...

Page 37: ...hold the Commentator 1 On Air and Talkback A buttons for 2 seconds These buttons will then illuminate red to verify that backup set 1 has been loaded To Load Backup Set 2 And Overwrite The Current Opt...

Page 38: ...Ref 1kHz 8dBu THD N 0 065 Ref 1kHz 18dBu 1 Distortion Point 18dBu 24Hz Transformer Balanced Talkback Outputs Maximum Output 8dBu Level Limited Frequency Response 0 5dB 20Hz to 22kHz Ref 0dB 1kHz Noise...

Page 39: ...ator inputs 1 3 permanently routed to Commentator 1 2 headphones Commentator inputs 1 3 permanently routed to Commentator 1 2 headphones when respective input is On Air Display Preferences Limit LED c...

Page 40: ...CP Commentator Unit Front Cover Plate CM TC1 Commentator Unit Transport Case Dimensions Raw 530mm W x 210mm D x 415mm H CM CU21TP 20 9 W x 8 3 D x 16 3 H Dimensions Boxed 600mm W x 260 D x 420 H CM CU...

Page 41: ...a transport case CM TC1 which is supplied empty The illustrations below show the case open and empty with foam cut out for unit and cable Fig 3 1a and also closed Fig 3 1b Fig 3 1a CM TC1 Commentator...

Page 42: ...ies continued Commentator Front Cover Plate For the CM CU21 there is a front cover plate CM CU21CP which is used to cover the adjustments available on the front of the CM CU21 commentator unit with th...

Page 43: ...Notes...

Page 44: ...www sonifex co uk t 44 0 1933 650 700 f 44 0 1933 650 726 sales sonifex co uk...

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