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User Guide - Studio Technologies, Inc.

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1. oo oof oo oo oo Figure 8 Main output button mode settings There are four available modes e Push to mute In this mode the main output is normally active The main out put will mute whenever the button is pressed and held This is the cough mode typically used for on air sports broadcasting applications Push to talk In this mode the main out put is normally muted The main output will become active whenever the button is pressed and held e Alternate action In this mode the main output will change between its active and muted state whenever the button is pressed Upon power up the main output will be in its muted state Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console e Hybrid This mode is a combination of push to talk and alternate action It s similar to the way talk buttons function on user stations associated with broad cast and production intercom systems If the button is pressed and held the main output will become active until the button is released If the button is momentarily tapped the main output will change state Upon power up the main output will be in its muted state Talkback Output Button Mode Switch SW3 3 configures the way the talk back output button functions SW3 3 Talkback Button Mode 12345678 Push to talk 0123456798 Hybrid press and hold to e
2. A core part of the Model 210 s internal Circuitry is a switch mode power supply that produces 48 volts 12 volts 5 volts and 12 volts This power supply circuit works very well as long as it is fed with sufficient input voltage and current Sufficient is defined as a minimum of 24 volts on the IFB input and 20 volts on the external 24 volt DC input The necessary current 105 milliamperes for the IFB input and 70 milliamperes for the external input must be supplied over their respective voltage ranges It s worth discussing what will happen if either power source falls below its speci fied minimum Typically if the Model 210 is being powered by an external 24 volt nominal power source normal operation will continue until the input falls to the 18 20 volt range As the input voltage drops below this range the Model 210 s internal power supply will have reduced stability operating in this manner until its low voltage shutdown circuit halts opera tion Note that as the input voltage moves down from 24 volts the input current will rise proportionately to make up for the loss of power If an IFB circuit is powering the Model 210 maintaining the required voltage and cur rent is more critical Should the voltage or current fall below the specified minimum the Model 210 s power supply circuit will again become unstable This will become an issue as noise will be induced into Model 210 User Guide Studio
3. 210 s main printed circuit board It provides access to and a means to power the two lamps Pin 1 of the header is connected to the common point of the Model 210 s circuitry which is also connected to one contact Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console on both lamps Pin 2 of the header is con nected to the other contact on both lamps Pin 3 is connected by means of a current limiting resistor to the external 24 volt DC source If lamps were obtained from Studio Technologies then adding a jump er from pin 2 to pin 3 is all that is required to get things going A standard 0 1 inch center jumper commonly used on elec tronic equipment is all that is required A 390 ohm 1 watt resistor is electronically in series between the external 24 volt DC input and pin 3 of the header When used with the lamps available from Studio Tech nologies the resistor limits the lamp cur rent to approximately 40 mA This lights the lamps to a moderate intensity If a different type of lamp is installed its power source should be connected to pins 1 common and 2 lamps of the header Remote Control Connections Provision has been made on the Model 210 s printed circuit board assembly to allow external switches or contact closures to control the main output and talkback output functions A 3 position header labeled P14 provides access to the cir Cuitry associated with the functions
4. Pin 1 of the header is connected to the common point of the Model 210 s circuitry Pin 2 of the header is connected to the circuitry associated with main output pushbutton Pin 3 of the header is connected to the cir cuitry associated with the talkback output pushbutton The input circuitry is active low with a 10 k ohm resistor connected to 5 volts acting as a pull up A combi nation of resistors and capacitors provide ESD protection A qualified technician can use these inputs for special applications Contact the factory for additional details Model 210 User Guide Studio Technologies Inc Compressor Circuit In this section some general information about the Model 210 s compressor circuit will be provided As previously discussed the output of the microphone preamplifier circuit is connected to a studio quality compressor circuit The out put of the compressor is used by the talk back output and if configured the main output In most cases the main output will utilize the signal coming directly out of the microphone preamplifier The gain element in the compressor circuit is a laser trimmed voltage controlled amplifier integrated circuit It provides accurate low noise low distortion per formance The threshold of the compres sor Circuit is 2 dB above the Model 210 s nominal internal operating level of 2 dBu A 5 1 compression ratio is implemented and like the threshold level is not field adjustabl
5. User Guide Studio Technologies Inc Model 210 Announcer s Console Technical Notes Grounding and Shielding As previously discussed in this user guide the pin 1 connections on both the main and talkback outputs 3 pin male XLR type connectors are floating i e not con nected to anything within the Model 210 s enclosure Some audio experts might take offense to this grousing that this should have been left to the user or installer to be connected or disconnect as desired However repeated field testing found that floating pin 1 on the outputs was the key to maintaining quiet audio From Fenway Park to the Orange Bowl and then north west to Husker Stadium lifting pin 1 did the trick A simple solution is available if an application does require that a ground be available on the main and talkback outputs interconnecting cables All Model 210 XLR type connectors have a ground connection that is made to the interfacing connector s metal shell And most XLR type connectors have a pin or con nection point available to access its metal shell By connecting the cable shield to the mating connector s shell terminal the common connection typically found on audio interconnections is created IFB Channel Crosstalk By the very nature of its design a stan dard wet IFB circuit is prone to exhibit cross talk between its two audio channels This occurs because the audio paths are unbalanced
6. channel 1 audio pin 3 channel 2 audio Also compatible with dry audio signals with signal levels of less than 0 dBu Impedance 10 k ohms nominal Nominal Level 10 dBu Optional Line Inputs 2 Type balanced transformer coupled Impedance 10 k ohms nominal Nominal Level 4 dBu Compressor Threshold 2 dB above nominal level Attack Release Time 2 mSec 100 mSec nominal Slope 5 1 nominal Status LED compressor active Issue 4 October 2008 Page 34 Main Output Type balanced transformer coupled Nominal Level 2 dBu Maximum Level 20 dBu into 2 k ohms Impedance 100 ohms nominal Talkback Output Type transformer coupled with series capacitors and isolation resistors Impedance 600 ohms nominal Nominal Level 4 dBu Maximum Level 11 dBu compressor restricts maximum Headphone Output 1 stereo Compatibility intended for connection to mono or stereo headphones or headsets with nominal impedance of 100 ohms or greater Type voltage driver Maximum Output Voltage 8 Vpp 150 ohm load Power Sources IFB 24 32 Vdc 105 mA External 24 Vdc nominal 70 mA 24 Vdc acceptable range 20 30 Vdc Units shipped to North America and Japan include a 120 V input 24 Vdc output power supply Units shipped to all other locations include a universal input 24 Vdc output power supply Options one or two line input cards can be installed to provide support for connection of line level balanced or
7. each channel would connect to the other side of the pairs If the pairs also contain shields the wiring could be done somewhat differ ently One option is to connect common to both cable shields IFB channel 1 DC with audio to one full pair and IFB chan nel 2 to the second full pair A better op tion might be to have common connect to both shields and one side of the pair that serves IFB channel 2 Other options are available if an applica tion demands low crosstalk If resources in the broadcast or production facility allow one method would be to run the Issue 4 October 2008 Page 25 Model 210 Announcer s Console IFB circuits dry no DC and differential balanced This would gain the benefits of differential transmission including mini mizing the crosstalk If optional line input cards have been installed in the Model 210 the balanced line level signals can be directly connected However if it s desired to connect cue sources to the Model 210 using an IFB type circuit the line level audio signals will need to be wetted up into standard IFB circuits This is easily accomplished using one of several high performance IFB interface units from Stu dio Technologies For further information please refer to the Studio Technologies website IFB Audio Levels The Model 210 is designed to operate best with IFB audio levels that are nomi nally 10 dBu This is the nominal level of most IFB systems s
8. headset microphones such as the Sennheiser HMD25 selecting an initial setting of 40 dB is appropriate Users who speak loudly might need to have the gain reduced to 30 dB Quiet users might need 50 dB of gain An LED indicator is provided as an aid in correctly setting the gain of the micro phone preamplifier Red in color this LED is located adjacent to switch assembly 1 It is visible by observing the bottom of the Model 210 s enclosure when the security plate has been removed Technically this red LED lights whenever the compressor Circuitry is controlling the dynamic range of the signal coming from the microphone preamplifier The threshold is set to be 2 dB above the Model 210 s nominal internal operating level So a good rule of thumb is to adjust the gain of the micro phone preamplifier such that the compres sor active LED lights flashes when the connected microphone is sending signal peaks During normal operation the LED should not remain fully lit when audio is present on the mic input 55 important to remember that the com pressor active LED is used to assist in setting the gain to the optimal value It doesn t necessarily indicate that the main output s signal is being compressed Unless specifically configured to perform otherwise the output of the compressor is only used for the talkback output It s expected that the 20 and 60 dB gain settings will not often be used But there are al
9. ment and voice over narration booths System Features Microphone Input A high performance microphone preamplifier circuit provides low noise low distortion amplification over a 20 to 60 dB gain range The gain is adjustable in 10 dB steps The input is compatible Issue 4 October 2008 Page 5 Model 210 Announcer s Console with balanced dynamic or condenser mi crophones The microphone power source is 48 volts nominal and meets the world wide P48 phantom power standard An LED indicator serves as an aid for optimiz ing the setting of the preamplifier s gain The output of the microphone preamplifier is used by the main output as well as be ing routed to the compressor circuit that supports the talkback function Main and Talkback Outputs The Model 210 provides one main and one talkback output The main output is designed to serve as the on air stadium announcement or other primary audio feed Nominally 2 dBu it is designed as a fully professional interface with high output capability low distortion and low noise It features a high quality transformer expressly designed for driving long broad cast cable runs The talkback output is intended to provide production trucks control rooms or support personnel with a talent originated cue signal The talkback output is transformer coupled with a 4 dBu nominal signal level It contains resis tors in series with its output connections allowing the talkback o
10. other undesirable yet real world hazards Issue 4 October 2008 Page 8 Power Sources The Model 210 can derive its operat ing power from either the IFB input or an external nominal 24 volt DC source For redundancy both power sources can be connected simultaneously An internal switch mode power supply ensures that all Model 210 features are available when the unit is powered by either source The Model 210 is compatible with IFB circuits provided by most standard broad cast systems However maximum perfor mance can often be obtained by using the IFB interface devices available from Studio Technologies Single channel and four channel units are available each providing high quality audio along with an excellent source of DC power They re directly com patible with most matrix intercom systems as well as standard line level audio signals Refer to the Studio Technologies website for details Configuration Model 210 configurations are made us ing anumber of DIP type switches One 8 position switch array is used to set the gain of the microphone preamplifier the on off status of phantom power and the headphone stereo mono mode Another 8 position switch array configures which of the IFB audio sources is routed to the headphone output A third 8 position switch array Communicates the desired operating modes to the microprocessor All switches are accessible via the bottom of the Model 210 s enclosure the unit
11. present on the right channel A stereo headphone mix can t be created But in most cases this limitation won t over shadow the benefit of being able to create the mix For signal flow clarification please review the block diagram located at the end of this user guide Operating Modes The eight switches associated with switch assembly SW3 are used to configure the Model 210 s operating modes Technically these switches talk to the micro control ler integrated circuit and associated soft ware that give the Model 210 its smarts The software has been carefully designed to provide a number of different ways in which the unit can function It s critical to carefully review the available options and Issue 4 October 2008 Page 18 choose the ones that best meet the needs of a specific application Note that switch es can be changed even while the Model 210 is powered up and operating The unit s operating characteristics will change in real time in response to configuration changes Main Output Button Mode Switches SW3 1 and SW3 2 configure how the main output button functions SW3 1 and SW3 2 Main Button Mode Push to mute cough z Push to talk oo 5 oo oo oo 2 Alternate action latching oo 5 oo oo oo 5678 Hybrid press and hold to enable tap to latch
12. the button cap If you need to make your own labels the process is quite simple Use a personal computer to create the desired text The finished label size should be 0 625 inches 15 8 mm square The completed artwork can then be printed on transparency film sheets using a laser or inkjet printer These sheets are readily available from most office supply stores A pair of scissors or an X ACTO knife will complete the task Configuration For the Model 210 to support the needs of specific applications a number of op erating parameters must be configured These include microphone preamplifier gain phantom power on off headphone source selection headphone stereo mono mode and operating modes Three 8 position DIP type switch assemblies are used to establish the desired configura tion These switch assemblies are referred to as SW1 SW2 and SW3 with individual switches designated as SW1 1 SW1 2 etc The switch assemblies are accessed through openings in the bottom of the Model 210 s enclosure The enclosure does not have to be disassembled to gain access to the switches To prevent unauthorized personnel from changing the configuration settings a security plate is attached to the bottom of the Model 210 s enclosure For conve nience attached to the security plate is a configuration settings label It provides a summary of the configurable parameters and related information Refer to Ap pendix A for a represen
13. the button to enable or disable the main output as desired This is useful in radio broadcasting announce booth or voice over applications The fourth mode provides a hybrid function supporting both push to talk and tap to enable tap to disable operation This operation is similar to that found in many broadcast intercom system user stations The button associated with the talkback function can be configured to operate from either of two modes One of the modes supports a push to talk function This is typically used for on air broadcast applications The other mode provides a hybrid function the operation of which is discussed in the previous paragraph The hybrid mode is especially useful when the Model 210 is used in a production support application IFB Input A broadcast standard wet DC with au dio IFB circuit can be directly connected to the Model 210 s IFB input Originated by sources such as the RTS 4000 series IFB system or IFB interface devices from Model 210 User Guide Studio Technologies Inc Studio Technologies the connected IFB circuit can provide DC power to operate the Model 210 as well as two channels of cue audio Cue Sources The Model 210 allows the two IFB audio sources to be selected for routing to the headphone output Originating in produc tion trailers control rooms or remote loca tions these unbalanced sources normally provide DC power and program with interrupt audi
14. unbalanced audio sources Dimensions Overall 5 6 inches wide 14 2 cm 3 3 inches high 8 4 cm 8 5 inches deep 22 4 cm Weight 3 4 pounds 1 6 kg Specifications and information contained in this User Guide subject to change without notice Model 210 User Guide Studio Technologies Inc Appendix A A label is attached to the security plate on the bottom of the unit It provides a summary of the configurable parameters and related information The actual label size 4 25 inches by 4 60 inches Model 210 User Guide Studio Technologies Inc Assign to Left Headphone Headphone Sources Operating Modes Model 210 Announcer s Console Studio Technologies Inc Model 210 Configuration Settings For full documentation see www studio tech com Channel 2 Pin 35 Line In 2 Line In 1 Channel 1 Pin 2 Switch 2 8 012345678 Switch 3 912345678 ijji Talkback Button Headphone Controls Main Button Y V Push to mute A Push to talk Vv A Latching A A Hybrid Talkback Button Y Push to talk A Hybrid Headphone Controls Level level A Level balance Main sall Assign to Right Headphone IFB Channel 1 Pin 2 IFB Channel 2 Pin 3 1 i In 2 select one only E Mode Main Output Source Headphone Minimum Headphone Reverse Headphone Reverse Vv Normal A Reverse Headphone Minimum Y 40 dB A Full mute Main Output Source Vv M
15. with the main output will light accordingly The on air mode should be selected for all on air broadcast applications It s imperative that Model 210 User Guide Studio Technologies Inc Figure 14 System mode settings the main output be muted whenever on air talent uses the talkback output to commu nicate with production personnel When the system mode is set for produc tion the main output is never muted in response to the talkback output being active This mode allows the main output to be used for example as an additional talkback output In this way the main and talkback outputs can be used indepen dently with neither impacting the other This also allows both buttons to be used simultaneously When selected for the cor rect application the production mode can prove to be very useful But it s not appro priate for on air use Conclusion Once the switches have been set to the desired configuration the security plate should be reattached The four rubber bumpers should be hand tightened only No tools should be used Operation At this point the desired input output and power connections should have been made The button labels may have been revised Finally the configuration switches should have been set Normal operation of the Model 210 can now begin The unit will begin functioning as soon as a power source is connected As previ ously discussed the power source can be Issue 4 October 20
16. 08 Page 21 Model 210 Announcer s Console provided by an IFB circuit an external 24 volt DC power source or both It s impor tant to highlight the fact that the Model 210 is an active device Audio signals will not be present on the outputs if correct power has not been supplied Specifically the microphone does not passively cut through to the main output connector Upon Model 210 power up the three status LEDs will light in succession as a firmware boot up indication The unit will then begin normal operation Depending on the selected configuration one LED associated with the status of the main out put may be lit The user is now presented with two buttons three LEDs and two rotary controls These are simple to oper ate and understand as will be described in the following paragraphs Pushbutton Switches and Status LEDs Two pushbutton switches are used to control the main and talkback outputs The way each operates depends on the selected configuration Three LED indica tors are located adjacent to the buttons They reflect the status of the main and talkback output functions Main Output Button and LED Indicators The button on the left factory labeled as COUGH functions according to the se lected configuration Two LED indicators located directly above the button are as sociated with the status of the main out put The green LED located on the right is lit whenever the main output is
17. B circuit or auxiliary input will have to be calibrated as re quired This is somewhat counter to the usual mentality of just providing the user with whatever level comes up by default Spending a few extra minutes trimming the audio levels can result in much happier and more productive talent Level Balance Mode When set to the level balance mode the two controls operate together to adjust the desired headphone output level The control on the left adjusts the overall level of both the left and right channels The balance control located on the right adjusts the relative left right level bal ance In this mode the controls operate in a manner reminiscent of a consumer audio amplifier or receiver If set to the normal mode rotating the balance control in the counterclockwise direction reduces the level of the right channel providing the user with more perceived level in the left channel If set to the reverse mode rotating the balance control in the coun terclockwise direction reduces the level of the left channel providing the user with more perceived level in the right channel Issue 4 October 2008 Page 24 When in the level balance mode and the minimum output level is set to 40 dB turning the level control to its fully coun terclockwise position will place both head phone output channels to 40 dB below maximum This ensures that talent will never be fully isolated from potentially important cue signal
18. Model 210 Announcer s Console User Guide Issue 4 October 2008 This User Guide is applicable for serial numbers M210 00415 and later Copyright 2008 by Studio Technologies Inc all rights reserved www studio tech com 50311 1008 Issue 4 This page intentionally not left blank Model 210 Announcer s Console Table of Contents 5 System acne 5 Installation ANd Setup c ccceeessseeeeeeeseeeeeesseeeeeeeaes 9 cree 14 21 Technical 25 HOO C IM CATON Svea cans 34 er errr 35 Block Diagram Model 210 User Guide Issue 4 October 2008 Studio Technologies Inc Page 3 Model 210 Announcer s Console This page intentionally not left blank Issue 4 October 2008 Model 210 User Guide Page 4 Studio Technologies Inc Model 210 Announcer s Console Introduction What This User Guide Covers This User Guide is designed to assist you when installing configuring and using the Model 210 Announcer s Console Additional background technical informa tion is also provided A product block dia gram is included at the end of this guide System Overview The Model 210 Announcer s Console is designed to serve as the audio control center for announcers commentators and production talent The tableto
19. TAGE POWER BUFFER HEADPHONE SOURCE S BUFFER AMPLIFIER LEFT LEVEL R HEADPHONE OUTPUT CONTROL 7 FB INPUT r 1 4 INCH 3 COND XLR F o L DIGITAL BUFFER RIGHT LEVEL CONTROL H o e AUXILIARY INPUT 1 3 PIN HEADER e l AUXILIARY INPUT 2 3 PIN HEADER 48v POWER gt 12V supply 45v 24VDC INPUT 2 1 X 5 ay gt M210BD_B STUDIO TECHNOLOGIES INC w BUTTON BACKLIGHTING 5 HEADER MODEL 210 ANNOUNCER S CONSOLE BLOCK DIAGRAM ALSO HAS 3 PIN HEADER IN PARALLEL ON PRINTED CIRCUIT BOARD DRAWING NO DATE PAGE s FOR SERIAL NUMBERS 00415 AND LATER 31073 12 05 07 01 oF 01
20. Technologies Inc the IFB circuit s audio signals The reason is simple an IFB circuit multiplexes 3 conductors so that they carry both pow er and audio signals If sufficient amounts of voltage and current are supplied to the Model 210 s IFB input the Model 210 s power supply will draw a steady amount of energy This will not disturb the analog signals on pin 1 common for DC and au dio and pin 2 DC and channel 1 audio But if the Model 210 s power supply is not supplied with sufficient energy volts x amps it will try to draw what it needs from the IFB circuit becoming unstable in the process The IFB circuit s audio signals will be corrupted by the power supply s attempt to draw enough power Instead of nice clean audio there will be squeaks squeals and some awfully funky noises added Again in a low voltage or low current situation no damage will be done to the Model 210 s circuitry but correct operation will not be possible In most cases maintaining the IFB circuit s required voltage and current shouldn t be a problem But issues may arise due to malfunctioning IFB circuit sources or poor interconnect cabling Typically ex cessive cable length won t be the cause of problem Generally problems will be caused by broken or damaged connec tor pins dirty patch points or damaged partially open cable conductors Measur ing the IFB circuit s voltage and current draw directly at the Mode
21. active This could be considered as an on air or mic active indicator At the least it should serve as a careful what you say warn ing If the Model 210 s system mode is configured to on air the red LED located Issue 4 October 2008 Page 22 on the left will be lit when the main output is muted This indicates that it s safe to speak as one sees fit If the Model 210 s system mode is config ured to production the red LED will never light This is to reflect the fact that the main output button has now taken on a function similar to that of the talkback output but ton To clarify when the Model 210 is set to the production mode the red LED will never light the green LED will light when ever the main output is active Main Output Button Modes e Push to mute If this mode is selected the main output is normally active The main output will mute whenever the but ton is pressed and held Push to talk If this mode is selected the main output is normally muted The main output will become active when ever the button is pressed and held Alternate action If this mode is selected the main output will alternate between its active and muted states whenever the button is pressed Upon power up the main output will be in its muted state e Hybrid This mode is a combination of push to talk and alternate action It s similar to the way talk buttons function on user stations associated with broad cast o
22. acts H main output status 912345678 Production talkback output status does not impact main output status Figure 13 Main output source settings applications the output of the microphone preamplifier is the desired source This will provide the most natural audio qual ity with the potential for a large amount of dynamic range In some applications it may be desirable for the output of the compressor circuit to be routed to the main output Appropriate applications could include on air broad cast situations where nonprofessional talent is present Controlling the dynamic range of the audio signals on the main output can limit the chance of cable cross talk and equipment overload Another typi cal application where using the output of the compressor would be when the Model 210 s system mode is selected for produc tion In this case the main output would be used as an additional talkback output and dynamic range control could be beneficial System Mode Switch SW3 8 is used to configure the overall operating mode of the Model 210 Specifically it determines how the main output operates vis vis the talkback out put Understanding how the two modes impact overall system operation will en sure that correct operation and maximum usability will occur When selected to the on air mode the main output will mute whenever the talkback output is active The LED indicators associated
23. ajor issue as long as as sociated monitor loudspeakers are tempo rarily attenuated or muted Selecting the correct amount of gain for an application might take a little experimenta tion The goal is to bring the mic s signal up to line level nominally 2 dBu for the Model 210 s main output Operating at this signal level will help to ensure the delivery of clean audio to the connected device The output of the Model 210 s microphone preamplifier is used by the main output and by way of the compressor circuit the talkback outputs So creating a nice hot signal will help maintain audio quality specifically the signal to noise ratio when driving the often lengthy cable runs SW1 1 through SW1 5 Mic Preamp Gain 12945478 20 dB 12345678 30 dB 912345678 40 48 15345578 50 dB 12545879 60 dB 7 i i 0 dB no gain Factory use only Figure 4 Microphone preamplifier gain switch settings Model 210 User Guide Studio Technologies Inc Unfortunately there s no perfect gain setting that this guide can recommend The two issues that impact the setting are output sensitivity of the connected microphone and the acoustical output level of the microphone s user With some
24. be discussed The first is that button backlighting is not intended to serve tally applications A common connection to power both lamps is provided indepen dent access to the lamp connections on each button is not provided It is strictly intended to provide a moderate amount of illumination to the button s clear lens and associated labeling The second restriction is that power for the backlight ing function cannot be provided by the IFB input there is simply not enough cur rent available from a typical IFB circuit to power the Model 210 and light the lamps However power from the external 24 volt DC source can be used This requires that this power source be connected whenever backlighting is desired From the factory lamps bulbs are not installed in the pushbutton housings They are pluggable T 1 bi pin type and are simple to install The mating socket is accessed by removing the button s lens caps graphic label and back frosted lens Compatible incandescent lamps with a nominal rating of 18 volts 28 mA are available from Studio Technologies part number 12030 Bulbs with other nominal voltages should also be available from electronics parts vendors While compat ible LED based lamps are probably also available incandescent lamps when pow ered below their rated current and voltage can provide extremely long and reliable operation A 3 position header connector labeled P12 is located on the Model
25. cated on the main printed circuit board The header associated with auxiliary input 1 is labeled P11 The header associated with auxiliary input 2 is labeled P10 Note that the unused header remaining on the line input card has its pins multed with the leads on the 3 pin female XLR type connector It is provided for other applications that may need it Additional installation details are provided in the next section of the user guide Included is a recommended connector labeling method that is appropriate when line input cards are installed For balanced audio sources the mating connector 3 pin male XLR type should be wired so that signal high or hot is connected to pin 2 signal low or cold is connected to pin 3 and shield is con nected to pin 1 Unbalanced sources should be wired so that signal high is on pin 2 and signal low shield is connected to both pins 1 and 3 If this results in hum on the input try connecting signal high to pin 2 signal low shield to pin 3 and pin 1 left unterminated floating Several things are worth mentioning when it comes time to actually using a line input card The input is transformer coupled with a nominal input impedance of 10 k ohms Capacitors in series with the trans former s primary provide protection again accidental connection of a cable that has DC voltage present on it The nominal input level is 4 dBu but should work cor rectly with signal levels down to
26. con nectors This no solder solution makes customizing a Model 210 a simple pro cess The headers located on the Model 210 s printed circuit board are Molex part number 22 23 2031 They mate with Molex housing number 22 01 3037 To make the interconnection separate crimp terminals are attached to loose wires and then snapped into the housing Molex part number 08 50 0114 specifies crimp terminals that are appropriate for wires of 22 to 30 gauge These parts are available worldwide from sources such as Digi Key www digikey com To make the process of connecting to the Model 210 s headers a simple task an interface cable kit part number 31087 is available from Studio Technologies Each kit includes five cable assemblies and a length of heat shrinkable tubing Each cable assembly consists of a mating connector with three color coded wires attached These wires nominally 12 inches in length allow convenient solder ing to a connector slated to be installed Model 210 User Guide Studio Technologies Inc in a spare location on the Model 210 s back panel For reference the wire color for pin 1 is gray pin 2 is yellow and pin 3 is blue The heat shrinkable tubing is provided so that the connector solder cups can be insulated from each other It will also provide some strain relief to the solder joints Be certain to slip the desired length of tubing over the wire prior to soldering a connection If the w
27. ction correctly with one of these circuits For reliable operation especially when using lengthy cable runs it s strong ly recom mended that no other device be connected to a 4000 series IFB circuit that is speci fied for connection to a Model 210 This requirement is due to the current limited DC source that is supplied by the 4010 IFB Controller With 4000 series IFB circuits channel 1 XLR pin 2 provides program audio that is interrupted with cue signals This channel is sometimes referred to as program with interrupt It s important to note that the program audio source fully mutes whenev er directors or producers are communicat ing with on air talent Channel 2 XLR pin 3 of the IFB circuit provides a program only audio feed It is never interrupted with cue signals Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console While the Model 210 s IFB input was designed for connection to a wet IFB Circuit it s also possible to connect line level audio sources Please refer to the Technical Notes section of this user guide for details External Power Input An external source of 24 volt DC power can be connected to the Model 210 by way of a 2 1 x 5 5 mm coaxial power jack which is located on the back panel of the unit The center pin of the jack is the posi tive connection While the requirement for the external source is nominally 24 volts correct opera
28. cue sig nals The combined signals are sent to both the left and right channel headphone output driver circuits The outputs of these circuits connect by way of 51 ohm series protection resistors to the headphone output jack SW1 6 Headphone Stereo Mono Stereo Mono sums L R Figure 7 Headphone output mode settings Issue 4 October 2008 Page 17 Model 210 Announcer s Console The headphone output monaural mode feature was specifically included so that a special 2 channel headphone mix mode can be created By enabling the mono mode the two front panel user level controls pots can be used to create the desired mix of signals being sent to the headphone output Many applica tions especially in production settings can benefit from this capability The desired cue sources must be carefully assigned to take advantage of the monau ral mode The first cue source should be assigned using the DIP type switches to the left channel Its output level will be adjusted by the left control The second cue source should be assigned to the right channel Its output level will be adjusted by the right control There is one limitation related to the head phone mono output mode It s the fact that the output will be 2 channel mon aural Whatever signal is present on the headphone output s left channel will also be
29. d dry audio outputs one for each IFB or intercom channel These outputs are useful for a variety of produc tion and testing applications For example the outputs can serve as the interface between a traditional wet IFB system and a wireless in ear monitor system The outputs can also be connected to a moni tor panel allowing visual and aural moni toring of the IFB audio signals In conclusion we re sorry for this shame less promotion of the Model 72 Level Meter Interface But necessity was defi nitely the mother when it came to the unit s invention Working in the field without such a device we felt blind when connecting to IFB circuits That no longer has to be the case and we think that you ll find owning one a very worthwhile invest ment For further information please refer to the Studio Technologies website Phantom Power The Model 210 provides a 48 volt nominal source of phantom power to support con denser type microphones It s designed to meet the P48 requirements as specified in the IEC 61938 standard The circuitry is very simple two 6 81 k ohm resistors pro vide a path from a 48 volt source to pins 2 Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console and 3 of the microphone input connector The resistors and the power source work together to provide 48 4 volts up toa maximum current of 10 milliamperes Symptoms of Insufficient Power
30. does not have to be disassembled Changes made to any of the configuration parameters become active immediately To prevent access to the configuration switches a security panel included with each unit is attached to the bottom of the enclosure Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console Connectors The Model 210 uses standard connectors throughout The microphone and IFB inputs use 3 pin female XLR type connectors The main and talkback outputs use 3 pin male XLRs A 4 inch 3 conductor jack is used for the headphone output The ex ternal source of 24 volt DC power is con nected by way of a 2 1 x 5 5 mm locking coaxial power jack In the world of broadcast and produc tion audio it s fair to say that applications vary widely To this end one or two addi tional XLR type connectors can easily be mounted into the Model 210 s back panel Multiple 3 position headers located on the Model 210 s circuit board provide techni Cian access to all input and output connec tions Using a factory available interface cable kit allows a Model 210 to be opti mized to meet the exact needs of specific applications For example some applica tions may prefer to use a multi pin XLR type connector to interface with a headset This can easily be accomplished by adding the appropriate 5 6 or 7 pin XLR type con nector and making a few simple connec tions Other applications may benef
31. e The threshold and ratio set tings were selected so that excellent talkback audio would be provided By controlling the dynamic range intelligibility can be improved and overloading of con nected devices can be avoided An LED indicator lights whenever the compres sor s threshold has been reached and the Circuit is actively controlling the dynamic range This LED is provided as an aid when setting the gain of the microphone preamplifier Issue 4 October 2008 Page 33 Model 210 Announcer s Console Specifications General Audio Frequency Response 20 Hz 20 kHZ 0 1 dB mic in main out Distortion THD N 0 008 measured at 1 kHz mic in main out S N Ratio 80 dB referenced to 46 dBu mic in 2 dBu main out Connectors Mic In IFB In 3 pin female XLR type Main Out Talkback Out 3 pin male XLR type Headphone Out 1 4 inch 3 conductor phone jack 24 Vdc Power In coaxial power jack 2 1 x 5 5 mm locking bushing compatible with Switchcraft S760K plug Spare Connector Locations 2 Allows one or two Neutrik NC D L 1 connectors to be installed 3F 3M 5F 5M 6F 6FS etc Microphone Input Preamplifier Type electronically balanced Input Impedance 2 k ohms nominal Gain Range 20 to 60 dB nominal adjustable in 10 dB steps Compatibility dynamic or phantom powered mics Phantom Power 48 Vdc nominal meets IEC 61938 IFB Input Type 2 channel unbalanced pin 1 common pin 2 DC with
32. e gain setting of the microphone preamplifier sensitivity of the microphone and how loudly the talent speaks into the microphone The transformer used in the main output is intended for profes sional broadcast applications It has a low source impedance and can drive lengthy cable runs with no difficulty It is capable of driving 600 ohm loads but performs best with loads of 2 k ohms or greater This should not prove to be an issue as virtually all contemporary audio equipment has a relatively high input impedance As the secondary winding of the output transformer connects directly to the main output connector care should be taken so that DC voltage is never present on the interconnecting cable The main output is interfaced by means of a 3 pin male XLR type connector located on the Model 210 s back panel The interconnecting cable s mating connector female should be wired so that signal high or hot is on pin 2 and signal low or cold is on pin 3 The cable s shield can be connected to pin 1 but it will have no function To limit the chance of grounding interaction between the Model 210 and connected equipment pin 1 on the main output s connector is isolated from any point in the Model 210 The fact that pin 1 floats will minimize the chance of hums noises or buzzes being present on the equipment connect ed to the main output Model 210 User Guide Studio Technologies Inc Talkback Output Th
33. e talkback output is intended for con nection to control rooms production trailers or other locations where talent originated voice cues are required The talkback output is transformer balanced with a nominal level of 4 dBu To en hance talkback audio quality the com pressor circuit controls the dynamic range of the signal coming from the microphone preamplifier For protection against accidental connec tion to cables that have DC power present the talkback output is capacitor coupled In series with the talkback output leads are 300 ohm resistors making the ef fective output impedance approximately 600 ohms These resistors create a pas sive summing network allowing talkback outputs on multiple Model 210 units to be connected together The talkback output is connected by way of a 3 pin male XLR type connector which is located on the Model 210 s back panel A mating connector female should be prepared so that signal high or hot is expected on pin 2 Signal low or cold should be expected on pin 3 The cable s shield can be connected to pin 1 But like the main output in order to minimize the chance that ground interaction prob lems will arise pin 1 of the talkback out put connector is isolated from the Model 210 s chassis and circuitry By making pin 1 float an often feared ground loop problem shouldn t arise The talkback output is intended to drive lengthy cable runs that are frequent
34. eamplifier talk back routing and headphone monitoring resources Note that in some cases a user may wish to wear a headset or a pair of head phones in a left right orientation opposite of what s usual In this situation the trans ducer designated for the left ear would actually supply audio to the user s right ear and vice versa A specific application when this occurs is where on air talent Model 210 User Guide Studio Technologies Inc needs to have a headset s boom micro phone come across the right side of their face rather than the more typical left side In this case it s important to select the left and right channel headphone source assignment accordingly With the Model 210 s flexible source selection there s no reason why users such as on air talent shouldn t have their cue sources assigned correctly There may be cases where a monaural single muff headset or headphone will be connected to the Model 210 s head phone output In this case the desired source s should be routed only to the left channel No sources should be assigned to the right channel This will eliminate the short circuit current that could occur when a 2 conductor monaural plug is mated with the Model 210 s 3 conductor stereo headphone output jack Headphone Output Mode Switch SW1 6 allows a monaural head phone output to be created This is accomplished by summing adding the selected left and right channel
35. ed in this user guide The spare connector locations are compatible with the Neutrik DL series of connectors For flexibility versions are available that provide from three to seven contacts For example a compatible 3 pin female connector would be Neutrik part number NC3FD L 1 To support headsets the NC6FDS L 1 is often used This is a 6 pin female connector with the unique Switch craft 6 pin arrangement The hardware that secures the blank plates to the Model 210 s back panel is also intend ed to secure the replacement connectors If connectors are added to the Model 210 s spare connector locations adding labels to those connectors can be helpful Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console For a great look it is recommended that Brother P Touch inch 6 mm labels be created Tape material that prints white text on a black background works out well for the Model 210 The Brother label cassette number TX 3151 white on black is appropriate for use with many of their printers In addition to the spare connector loca tions on the back panel provision has been made to allow easy interconnection with the Model 210 s printed circuit board mounted input and output connectors This was accomplished by including numerous 3 position male header con nectors on the Model 210 s circuit board These headers on 0 1 inch centers are wired in parallel with the Model 210 s
36. eir off positions A more complex application might have a 2 channel IFB circuit connected to the Model 210 with an optional line input card installed and line level audio from a golf event spotter connected to that Ina case such as this it would be typical for IFB channel 1 to be assigned to the head phone s left channel IFB channel 2 as signed to the right channel and auxiliary input 1 also assigned to the right channel Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console SW2 1 through SW2 4 Left Channel Headphone Source Selection IFB In Channel 1 pin 2 In Channel 2 pin 3 Aux In 1 Aux In 2 012345678 WHE On to enable source multiple sources will sum SW2 5 through SW2 8 Right Channel Headphone Source Selection In Channel 1 pin 2 IFB In Channel 2 pin 3 Aux In 1 Aux In 2 012345678 o EHC wk On to enable source multiple sources will sum Figure 6 Left and right channel headphone source selection settings This would allow both IFB channel 2 and spotter audio to be heard in the head phone s right channel output To achieve this would require that switches SW2 1 SW2 6 and SW2 7 be placed in their on positions Note that using another Model 210 at the spotter location could also prove effective It would provide all the necessary microphone pr
37. es may not meet the needs of all users and applica tions For example it s reported that one European broadcaster typically uses these two colors in the opposite fashion Their choice is to have the red LED lit whenever the main output is active warning the tal ent that they are on air The green LED is lit whenever the main output is muted indicating to the talent that it s safe to say whatever they wish about whomever they wish to say it about For consistency the LED associated with the talkback button was selected to be green This lights whenever talkback is active It s possible that some applications Issue 4 October 2008 Page 28 may benefit from revising this LED color too While red is certainly one possible choice other colors are also a possibility including amber orange or blue these days there are lots of choices available The only limitation is the amount of current available to light each LED Using series resistors of no less than 560 ohms will ensure correct Model 210 operation A qualified technician can easily revise the LED colors to meet an application s exact needs The process would begin by disassembling the Model 210 s enclo sure and detaching the pushbutton LED printed circuit board assembly The LEDs would then be unsoldered removed and reinstalled or replaced in the desired locations To control the LED current and set the brightness a resistor is electrically i
38. ght is used to adjust the level of the right channel If configured to the reverse left right mode the control on the left side adjusts the headphone output s right channel The control on the right adjusts the left channel When in the level level mode and the minimum output level is set for 40 GB turning each control to its fully counter clockwise position will place its respective output level 40 dB below its maximum This setting ensures that talent will never be fully isolated from potentially impor tant cue signals If present on the Model 210 s input and assigned to the head phone channels some audio signal will always be present on the headphone output If set to the full mute mode turning each control to its fully counterclockwise position will cause its respective output to fully mute Issue 4 October 2008 Page 23 Model 210 Announcer s Console Each level control has a mechanical step detent that is located at the halfway 50 position of its rotation range This is intended to serve as an aid to Model 210 users In an ideal installation setting the controls to their detent position will result in a comfortable headphone output level The user in response to a changing operating environment can then move the level controls to get more or less level as desired The detent position will always remain as a useful reference point To achieve this condition the audio level on the connected IF
39. he Model 210 is compatible with bal anced dynamic and condenser micro phones Depending on the application the microphone may be part of a headset or be an independent handheld or stand mounted model The Model 210 s 48 volt nominal power source will support essen tially all phantom powered microphones The quality of the Model 210 s microphone preamplifier and associated circuitry is such that special applications may benefit from using high end microphones If selected appropriately models from man ufacturers such as AKG Beyer Neumann Sennheiser and Shure will perform very well in Model 210 applications Issue 4 October 2008 Page 9 Model 210 Announcer s Console Microphone interconnection is made by way of a 3 pin female XLR type connec tor which is located on the Model 210 s back panel The mating connector male should be wired so that pin 2 is signal high or hot pin 3 is signal low or cold and pin 1 is shield It s possible that an unbalanced microphone will also work correctly In this case the mating connec tor male should be wired so that pin 2 is signal high or hot and signal com mon shield is connected to both pins 1 and 3 The Model 210 is not compatible with unbalanced electret type microphones that require a source of low voltage DC for operation These microphones some times found in low cost headsets are not generally suitable for on air or other demand
40. ic preamplifier 4 Compressor System Mode Y On air A Production Phantom Power 48 V Spare Headphone Stereo Mono 60 dB 50 dB 40 dB 30 dB 20 dB Compressor 9 Active LED iW de Switch 1 Mic Preamp Gain Headphone Stereo Mono Phantom Power Preamp Gain Headphone Stereo Mono Vv Stereo A Mono Phantom Power 48 V y Off A On Label 15169 Rev B Issue 4 October 2008 Page 35 Model 210 Announcer s Console This page intentionally not left blank Issue 4 October 2008 Model 210 User Guide Page 36 Studio Technologies Inc 343 ACTIVE PREAMPLIFIER LINE DRIVER PHANTOM 600 600 MICROPHONE Has F POWER PROTECTION COMPRESSOR gt 2 MAIN OUTPUT XLR F 1 gt 3 XLR M gt 2048 248 1 Le ON OFF 048 4048 5048 6048 LINE DRIVER 600 600 300 2 TALKBACK OUTPUT 300 XLR M 448 NC gt 1 Crecen woh MAIN MAIN TALKBACK orF Fon TON HEADPHONE LEVEL 1 MICROCONTROLLER HEADPHONE LEVEL 2 oe i REMOTE o s MAIN CONTROL TALKBACK INPUTS 5 5 TALKBACK 3 PIN HEADER CONFIGURATION DIP SWITCHES TYPICAL OF 8 ere a SUMMING VOL
41. ignal present on the selected Model 210 inputs will always be present on the headphone output In most on air broadcast applications this is the appropri ate setting When the full mute mode is selected and the level level mode is also selected moving either control to its fully counter clockwise position will cause its associ ated channel to fully mute When the full mute mode is selected and the level balance mode is also selected turning the level control to its fully coun terclockwise position will cause both headphone channels to mute Turning the balance control to either its fully clock wise or fully counterclockwise position will cause the appropriate channel to mute Selecting the full mute mode may be appropriate for applications where mini mizing the chance of audio leakage is important This could occur when the connected headset or headphones are at times placed on a desk or tabletop Main Output Source Switch SW3 7 is used to select which audio source is routed to the main output The choices are the output of the micro phone preamplifier or the output of the compressor circuit For most on air Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console SW3 7 Main Output Source 012345678 Ne Mic preamplifier PEHE ag Compressor SW3 8 System Mode 012345678 On air talkback output status imp
42. ing applications As of the writing date of this user guide the Sennheiser HMD25 headset is very popular for on air sports broadcasting use A fine product it works very well with the Model 210 Note that adding the suffix XQ to the headset s part number HMD25 XQ specifies a 3 pin male XLR type connector for the dynamic micro phone and a inch 3 conductor plug for the stereo headphones This configura tion is very useful allowing the headset to work directly out of the box with the Model 210 If the writer may digress for a moment to recount a story an audio dealer once shared a secret with me concerning headsets He loved selling the lower end less expensive models of name brand headsets which he did by the veritable boatload Why Because these usually broke soon after going into service He knew that on a regular basis he d receive orders for more of them Had these Issue 4 October 2008 Page 10 users from the beginning purchased only premium quality headsets their total cost of ownership would have been much less Enough said Headphone Output The Model 210 s headphone output is compatible with stereo or mono head phones headsets or earpieces Connect ing devices with a nominal impedance of 100 ohms or greater is preferred This shouldn t prove to be an issue as essen tially all contemporary devices already meet this condition Devices are connected to the head
43. it from having mult or loop through connec tions something easily incorporated into a Model 210 One or two optional line input cards as previously discussed can also be mounted in the spare XLR positions 200 Series Announcer Console Products The Model 210 is just one in a series of announcer console products available from Studio Technologies For applications that require an alternate set of features the other products in the 200 series should be re viewed Complete information is available on the Studio Technologies website Model 210 User Guide Studio Technologies Inc Installation and Setup In this section interconnections will be made using the input and output con nectors located on the Model 210 s back panel Microphone input IFB input main output and talkback output signals are interfaced by way of 3 pin XLR type con nectors A inch 3 conductor phone jack is provided for the headphone output A 2 1 x 5 5 mm coaxial jack allows con nection of an external 24 volt DC power source System Components Included in the shipping carton are the fol lowing Model 210 Announcer s Console user guide button label sheet and 24 volt DC power supply For units shipped to destinations in Japan and North America the power supply will have a nominal AC mains input of 120 volts For all other des tinations a power supply compatible with 220 240 volt AC mains will be included Microphone Input T
44. ith a clear easy to use interface One pushbutton switch controls the status of the main output This is the audio out put intended for on air announcement or other primary uses Two LEDs display the on off status of the main output A second pushbutton switch controls the status of the talkback output This is the audio output used to communicate with produc ers directors spotters or other behind the scenes production personnel A status LED is associated with the talkback but ton Two rotary controls allow the user to adjust the level of the headphone output Flexibility A large part of the Model 210 s unique power is the ability to configure the operation of the main output and Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console talkback functions To meet the needs of the many specific broadcast and pro duction applications a variety of button operating modes is available The main output button can be selected to operate from among four modes In the push to mute mode the button performs a mo mentary mute of the main output In this way a cough button function is created something typically required for television sports broadcasting In the push to talk mode the button provides a momentary active function for the main output This mode would be appropriate for applica tions such as stadium announcement An alternate action latching configuration allows
45. l 210 s IFB input connector will quickly identify if there s a power issue And now for another shameless plug for other Studio Technologies products Frankly most devices that supply IFB circuits for broadcast applications use outdated technology that provides mediocre performance That s why Issue 4 October 2008 Page 27 Model 210 Announcer s Console Studio Technologies developed high performance IFB interface units These products do an excellent job of providing power and audio to connected devices such as the Model 210 However un like other products the power supplied by these units IFB circuits maintain their output voltage all the way to their full rated current The result is being able to power more devices over longer cable runs In addition the audio quality of these units is superior For further information please refer to the Studio Technologies website LED Colors As previously described two LED indica tors are associated with the main output and are located directly above the main output pushbutton switch The red LED located on the left is lit whenever the main output is muted The green LED located on the right is lit whenever the main output is active The thought pro cess behind the color choices was that red would relate to the main output being muted stop while green would relate to the main output being active go It s possible that these color choic
46. ly part of a remote broadcast application While the output circuitry is not intended to be on air quality overall audio performance should be very good Devices connected Issue 4 October 2008 Page 11 Model 210 Announcer s Console to the talkback output can range from amplified loudspeakers to analog inputs on intercom systems and input channels associated with audio consoles Connect ing the talkback output to devices that allow easy control of the signal level can be helpful For example connecting to a spare input module on an audio console provides the flexibility to add gain or attenuate as required A talkback associated output connection on the audio console can then connect to the final destination s As previously mentioned the talkback outputs on multiple Model 210 units can be directly connected together Using 8 simple Y or W cable this passive summing adding together of talkback signals allows one audio cable to serve as a master talkback path A side effect from using this passive summing tech nique is that signal attenuation will occur The audio quality won t suffer but an audio pad is created If two talkback outputs are connected together a signal attenuation of 6 dB can be expected Con necting three talkback outputs together will result in 9 5 dB of attenuation And four talkback outputs multed together will lead to 12 dB of attenuation In most cases this a
47. main output Talkback Output Button Modes e Push to talk If this mode is selected the talkback output is normally muted The talkback output will become active whenever the button is pressed and held Hybrid This mode is a combination of push to talk and alternate action If the button is pressed and held the talkback output will become active until the button is released If the button is momentarily tapped the talkback output will change state Upon Model 210 power up the talk back output is will be in its muted state Model 210 User Guide Studio Technologies Inc Headphone Output Level Controls Two rotary controls pots are located on the Model 210 s front panel and are associated with the headphone output The way the controls function depends on the selected configuration One configura tion parameter sets the controls to operate in a level level or a level balance mode Another parameter allows the left right assignment of the controls to be reversed A third parameter selects whether the headphone output channels will maintain a minimum output level or can be fully muted Level Level Mode When set to the level level mode the two controls operate independently Each control sets the output level of one chan nel of the stereo headphone output If con figured to the normal mode the control on the left side is used to adjust the level of the headphone output s left channel The control on the ri
48. n series with each LED An 820 ohm Y4 watt resistor is associated with the red LED while a 560 ohm 4 watt resistor is associated with each green LED These resistors would also have to be unsol dered removed and reinstalled Then the unit would be reassembled and tested to confirm that the changes function as desired For additional information about chang ing the LED colors please contact Studio Technologies technical support Travel Case For portable applications it may be desir able to store and transport each Model 210 in a protective case After much travel with prototype announcer console units Studio Technologies personnel learned to appreciate the Pelican Model 1450 case Purchased with the foam interior option it does an excellent job of holding one Model 210 its associated 24 volt DC power supply and documentation Some Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console applications may benefit from selecting a larger case that would also hold a related headset cables etc A larger case could also be selected that would hold multiple Model 210 units Pelican sells their prod ucts through a dealer network many of which can be located via a web search Connecting Line Level Inputs The Model 210 is designed to directly connect with wet broadcast IFB circuits However there may be applications where it would be helpful to also be able to con nect standard li
49. nable tap t to latch Figure 9 Talkback output button mode settings Two modes are available e Push to talk In this mode the talkback output is normally muted The talkback output will become active whenever the button is pressed and held Hybrid This mode is a combination of push to talk and alternate action If the button is pressed and held the talk back output will become active until the button is released If the button is momentarily tapped the talkback output will change state Upon power up the talkback output will be in its muted state Headphone Output Operating Modes The user is provided with two rotary level controls pots that are associated with the stereo headphone output Switches SW3 4 SW3 5 and SW3 6 are used to Model 210 User Guide Studio Technologies Inc configuration the way the controls func tion With just these three switches a wide range of operating modes can be con figured Carefully reviewing the capabili ties of the available functions may prove worthwhile Dual Channel or Stereo Mode Switch SW3 4 is used to select whether the controls provide a dual channel lev el level or stereo level balance mode of operation In the level level mode the two controls operate independently each controlling the level of one of the head phone output channels This mode is generally used for on air broadcast ap plication
50. ne level audio sources If it s anticipated that line level audio sources will frequently need to be con nected to the Model 210 one or two line input cards can be installed These cards available from Studio Technologies and purchased separately part number 31084 are mounted into the spare con nector locations that are provided on the Model 210 s back panel Each line input card contains passive Circuitry including a 3 pin female XLR type connector and 8 10 k ohm to 10 k ohm isolation trans former Once installed balanced or un balanced line level audio sources can be directly connected Note that in cases where only line level signals are connect ed an external source of 24 volt DC power is required This shouldn t pose a problem as a 24 volt DC power supply is included with each Model 210 Each line input card kit contains a printed circuit board assembly an interconnect ing cable and hardware To install the kit is very simple The XLR type connector is mounted into one of the spare connector locations on the Model 210 s back panel This secures the connector and associ ated printed circuit board to the enclo sure The interconnecting cable is then used to link the card and the Model 210 s main printed circuit board assembly One end of the cable is plugged into the line input card s 3 position header that is labeled OUT The other end of the cable is plugged into the desired 3 position header lo
51. ng may occur Prepare a 3 pin male XLR type connector so that the line level audio source designated as IFB channel 1 is connected with signal high on pin 2 and low shield on pin 1 The audio source designated as IFB channel 2 should be connected with signal high on pin 3 and low shield on pin 1 With this connection scheme the nominal input level is 10 dBu the same as with an IFB circuit This may require that an Issue 4 October 2008 Page 30 external attenuator pad be used to reduce the level of the connected signal As expected powering the Model 210 requires an external source of 24 volt DC to be connected Additional Connectors Two spare connector locations are provid ed on the Model 210 s back panel From the factory they contain blank plates that can be readily removed and replaced with a variety of XLR type connectors These spare connector locations are specifi cally included so that a Model 210 can be customized to meet the many specific needs that arise in broadcast and related audio applications Expected uses for these locations include adding a 5 6 or 7 pin XLR type connector to allow direct connection of a broadcast headset Other uses include creating a loop through or mult functions for the talkback out put or IFB input connections In addition Studio Technologies offers an optional line input card that mounts directly in a spare connector location This was previously describ
52. ning the balance control in the counterclock wise direction increases the perceived level of the left channel and vice versa As you may have already guessed when selecting the reverse left right mode of op eration everything is reversed To be more specific when selected for reverse mode and the level level mode is also selected the left control adjusts the headphone output s right channel output jack s ring lead while the right control adjusts the left channel When selected to the reverse mode and the level balance is also se lected turning the balance control in the counterclockwise direction increases the perceived level of the right channel and vice versa The reverse mode is provided specifically for cases where a headset s left and right ear pieces are placed on a user s head in a reverse orientation This ensures that the user is provided with a consistent and easy to use set of headphone level controls Minimum Level Mode Switch SW3 6 is used to configure the headphone output s minimum level In the 40 dB mode the minimum head phone output level is 40 dB below Issue 4 October 2008 Page 20 SW3 6 Headphone Output Minimum Level 012345678 40 4B Full mute Figure 12 Headphone output minimum level settings maximum The headphone output chan nels will never fully mute This ensures that any audio s
53. nominal Model 210 User Guide Studio Technologies Inc Issue 4 October 2008 Page 29 Model 210 Announcer s Console 10 dBu So that the rotary level controls provide a more comfortable range of operation during actual use reducing the level of a hot input signal by 3 to 6 dB is preferred versus having a full 4 dBu nominal level Note that if one or two line input cards are installed in a Model 210 both dry line level audio signals and a wet IFB circuit can be connected at the same time The audio sources will be routed to the head phone outputs by way of the headphone source configuration switches Each of the four possible audio sources can be routed to the left headphone output the right headphone output or both head phone output channels Details on how to use these switches are provided in the Configuration section of this user guide In emergency situations it s possible to connect line level audio signals directly to the Model 210 s IFB input connector This can be successfully done as long as several limitations are taken into account The first limitation is that the 10 k ohm input circuit presents an unbalanced load to the source In most cases this shouldn t pose a problem If a balanced intercon nection scheme must be maintained an in line isolation transformer can be used A second limitation is that the audio level presented must not exceed 0 dBu or sig nal clippi
54. o on one channel and pro gram only audio on the other Each source can be individually assigned to the left channel right channel or both left and right This allows a wide variety of stereo and mono headphone mixes to be created Some applications may benefit by being able to connect standard line level audio signals to the Model 210 To meet this need one or two optional line input cards can be installed in the Model 210 s back panel Each card provides a female XLR type con nector and transformer isolated 4 dBu nominal input circuit Each source can be individually assigned to the left channel right channel or both left and right Headphone Output Two rotary controls are provided for user adjustment of the headphone output levels For application flexibility the actual function of the two pots is configurable For tradi tional on air sports applications they can be selected to the dual channel level level mode which provides independent con trol of the left and right channel volume For use with dual channel cue signals or to support user preference the stereo level balance mode can be selected In this mode one control adjusts the overall level of both the left and right channels Issue 4 October 2008 Page 7 Model 210 Announcer s Console while the other allows adjustment of the left right level balance To help minimize the chance of broadcast cues being missed both level control m
55. odes can be configured so that a minimum headphone output level is maintained Alternately the headphone output can be set to fully mute when the controls are at their minimum position Provision has been made to support ap plications where a monaural cue feed is desired A configuration switch allows the summing combining of the selected left and right headphone sources In addition to creating a dual channel mono output it also allows the level controls to be config ured as a simple 2 channel mixer The headphone output was designed to meet the needs of contemporary head phones and headsets Specifically the output circuits act as voltage rather than power drivers In this configuration they can provide high output levels with very low distortion and noise along with mini mal current consumption The output cir cuits are configured to safely drive stereo or mono loads This ensures that all types of headphones headsets and earpieces can be directly connected Audio Quality and Protection The Model 210 s circuitry is carefully tailored to provide excellent audio perfor mance Professional quality components are featured throughout For reliability all audio routing is performed using solid state devices In all critical audio paths clickless electronic switches provide noise free control All audio inputs and outputs make extensive use of protection components This limits the chance of damage from ESD and
56. p unit is suited for numerous applications including on air television sports broadcasting The Model 210 integrates all on air talkback and cue audio signal routing into one com pact system Ease of use flexible in con figuration and sonically excellent are some of the unit s highlights The Model 210 is compatible with most broadcast and audio system environments Standard connectors are used to interface microphone headphone talkback and IFB signals Whether it s microphone switch ing talkback output or headphone cue feed superior audio quality is maintained throughout A microprocessor provides the Model 210 s logic power allowing exacting control of the unit s operation A range of configuration choices allow the desired op erating configuration to be easily selected While flexible the user is presented with an easy to use set of controls and indicators A truly next generation product extensive research into the needs and desires of field production personnel was integral to the Model 210 s creation While primarily tar geted for on air television applications spe cialized features are included to allow the Model 210 User Guide Studio Technologies Inc Figure 1 Model 210 front panel IFB IN TALKBACK MAIN OUT MIC IN PHONES OUT Figure 2 Model 210 back panel Model 210 to be used in a variety of other audio applications These include on air radio broadcasting stadium announce
57. phantom power s very nature it could be left applied to the microphone input at all times But generally people prefer to turn it off unless required for a specific microphone Headphone Source Selection Switch assembly SW2 is used to configure the source or sources that are routed to Issue 4 October 2008 Page 16 SW1 8 Phantom Power 48 V ariii oF On Figure 5 Phantom power switch settings the stereo headphone output The head phone sources are IFB channel 1 IFB channel 2 auxiliary input 1 and auxiliary input 2 The channels are provided by way of the IFB input connector located on the Model 210 s back panel The auxiliary inputs are available only if the optional line input cards have been installed or a special Model 210 configuration has been implemented Each of the available input sources can be assigned to the headphone output s left channel right channel or both the left and right channels The Model 210 s circuitry allows any combination of input assignments to be made For example consider the situation where a single channel IFB system with both program and interrupt audio on pin 3 is connected to the Model 210 In this case it may be desirable to assign this IFB signal to both the left and right channels This would en tail setting switches SW2 2 and SW2 6 to their on positions All other switches would remain in th
58. phone output by way of a 14 inch 3 conductor phone jack located on the Model 210 s back panel As is standard for stereo headphones the left channel is connected to the tip lead of the 14 inch headphone jack The right channel is connected to the ring lead of the jack Common for both channels is connected to the sleeve lead Devices with 14 inch 2 conductor mono plugs can also be used with the Model 210 s headphone output In this arrange ment only the tip lead left channel will be active The 2 conductor plug will physically connect short the ring lead right channel to the sleeve lead com mon Technically this won t damage the circuitry associated with the right channel headphone output 51 ohm protection resistors are electrically in series with the headphone output circuits However energy will be wasted if an au dio signal coming out of the right channel goes into a dead short There is a simple solution to this issue No audio source should be assigned to the right channel headphone output Refer to the Configura tion section of this user guide for details Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console Main Output The main output is intended to be the on air signal that connects to the input of an audio console The output is trans former balanced with a nominal signal lev el of 2 dBu The actual level will depend on th
59. r production intercom systems If the button is pressed and held the main output will become active until the button is released If the button is momentarily tapped the main out put will change state Upon Model 210 power up the main output will be in its muted state Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console Main Output vis a vis Talkback Activity This short section applies only in the case where the Model 210 s system mode is configured for on air and the main output button mode is set to alternate action or hybrid Talkback activity will always cause the main output to be placed in its off state If the main output was in the latched on state when talkback began once talkback activ ity ends that state will resume the main output will again be in its on latched state Talkback Output Button and LED Indicator The button on the right factory labeled TALKBACK controls the talkback output The manner in which the talkback button functions depends on the way it was con figured One LED indicator green in color is located directly above the talkback but ton It lights whenever the talkback output is active If the Model 210 s system mode is selected to on air whenever the talkback function is active the main output will be placed in the muted state If the Model 210 is selected to the production mode the status of the talkback output will not impact the
60. riter had a dollar for every time he forgot to put tubing on a wire or slip on a connector shell before making a solder connection The Model 210 s enclosure must be disas sembled prior to installing connectors in the spare locations Four hex head machine screws two on the bottom front of the en closure and two on the back panel must be removed A 5 64 inch hex driver is required The cover can then be carefully separated from the chassis remaining attached by means of a flexible cable assembly This flex cable assembly links the main printed Circuit board assembly with the board as sembly that contains the pushbuttons and LED indicators Ensure that the flex cable is not damaged while the Model 210 is being customized For easier access the pushbutton LED board assembly can also be easily removed The 3 position headers on the Model 210 s main circuit board assembly are located close to their related input or output connec tors The following list provides the printed Circuit board reference numbers and associ ated functions P3 Headphone output pin 1 common pin 2 tip left pin 3 ring right P4 Microphone input pin 1 shield pin 2 high pin 3 low Follows back panel 3 pin female XLR pin assignment Issue 4 October 2008 Page 31 Model 210 Announcer s Console P5 Main output pin 1 shield pin 2 high pin 3 low Careful Back panel 3 pin male XLR has pin 1 floating pin 2 high pin 3 lo
61. s In addition rotat ing the balance control to either its fully clockwise or fully counterclockwise posi tion will cause the applicable channel to be 40 dB below its maximum If set to the full mute mode turning the level control to its fully counterclockwise position will cause both the left and right channels to fully mute In addition rotating the balance control to either its fully clockwise or fully counterclockwise position will cause the applicable channel to fully mute Each control has a mechanical step detent that is located at the halfway 50 position of its rotation range The balance control will typically be set to its center detent position making the level of the left and right channels equal In an ideal installation the level control can also be set to its detent position and provide a comfortable headphone output level This will allow the user in response to their preference or a changing environment to adjust the level and balance controls as desired The detent positions will always remain as a useful reference point To achieve this condition the audio level on the connected IFB circuit or auxiliary in put must be adjusted as required Spend ing a few extra minutes trimming the connected audio levels rather than just providing whatever happens to come up should prove worthwhile The result will be talent that is more relaxed and an overall production that works more smoothly Model 210
62. s where independent cue signals are provided to the left and right head phone channels In the level balance mode the left rotary control sets the overall output level for both headphone channels The right rotary control is used to adjust the balance the relative levels of the left and right channels This mode is generally best suited for applications where a stereo cue source is being provided SW3 4 Headphone Control Mode 01234567 Dual channel level level 012345678 Stereo level balance Figure 10 Headphone control mode settings Reverse Left Right Mode Switch SW3 5 is used to select whether the rotary controls are in the normal or reverse left right mode of operation When selected to the normal mode and level level mode is also selected the left control adjusts the level of headphone output s left channel This is the signal that appears on the tip lead of the inch Issue 4 October 2008 Page 19 Model 210 Announcer s Console SW3 5 Headphone Control Operation 012345678 Normal ta HRABE Dg Reverse left right Figure 11 Headphone control operation settings 3 conductor jack The right control ad justs the level of the right channel When selected to the normal mode and the lev el balance mode is also selected tur
63. single ended and typically transported on a single shielded twisted pair audio cable The primary cause of the crosstalk is the capacitance between the wires in the cable pair The greater the Capacitance due to cable type and length Model 210 User Guide Studio Technologies Inc the more crosstalk there will be It s not surprising to find in sports broadcasting venues that audio from one channel in an IFB circuit can be heard bleeding into the other channel Does this generally create a problem No as each channel in an IFB circuit generally carries related audio content For example on air talent hearing in their left ear a small amount of program audio from channel 2 while an interrupt from channel 1 is active typically wouldn t perceive this as an issue There are several ways of reducing IFB channel crosstalk Probably the easiest way is to use cable pairs that are not twist ed Twisted pairs are great for differential balanced signals but not so great for unbalanced transmission This is gener ally because the more twists in a pair the greater the effective cable capacitance In a stadium or arena setting choosing standard telco pairs may actually work better than high performance audio or data cable Another option is to use two cable pairs for each IFB circuit If the pairs are not shielded the wiring is simple Common would be connected to one side of each pair and then signal from
64. t that they are highly reliable using gold plated con tacts for long life in less than ideal environ ments A second reason was that applying customized labels to the button caps would be very simple The labels text printed on clear material are placed under the clear caps on the top of the buttons From the factory the left button is labeled COUGH and the right button is labeled TALKBACK This was selected to be appropriate for many on air applications in English speaking locations But it s expected that these may need to be changed to meet the needs of specific applications As a head start for some applications a clear sheet with a number of commonly used button designations printed on it is included in the shipping carton These were created at the factory using a stan dard personal computer graphics program and laser printed onto 3M CG3300 trans parency film The desired button labels can be cut out with a pair of scissors fol lowing the printed guide lines that indicate the required size The clear lens on top of each button cap can be removed with a fingernail or small screwdriver Be certain not to scratch the button if a screwdriver or other small tool is used The clear label can be removed and replaced The button cap is then Issue 4 October 2008 Page 13 Model 210 Announcer s Console snapped back into the top of the button housing using finger pressure only No tool is required to replace
65. tative view of the Issue 4 October 2008 Page 14 label The security plate is held in place by means of four rubber bumpers feet that have built in screws Using your fingers remove the four bumpers so that the plate can be removed Refer to Figure 3 for a detailed view of the configuration switch assemblies a y fF wy it Eel he ren 1 Switch2 1 Headphone I Compressor i Sources Active LED je pi 234567 8 ji Switch 1 191 2345678 I 1 i i i Mic Preamp Switch3 i Headphone Operating Stereo Mono Modes Phantom 1 Power 0 5 Figure 3 Bottom view of Model 210 showing configuration switches and compressor active LED Microphone Preamplifier Gain and Phantom Power Five switches are used to set the gain of the microphone preamplifier One switch is used to select the on off status of the phantom power supply Model 210 User Guide Studio Technologies Inc Model 210 Announcer s Console Microphone Preamplifier Gain Switches SW1 1 through SW1 5 are used to select the gain of the microphone preamplifier The choices are 20 30 40 50 and 60 dB Only one switch should be enabled at a time There s no problem changing the gain setting while the unit is operating Audio clicks or pops might occur during gain transitions but this shouldn t be a m
66. tion will take place over a 20 to 30 volt range The Model 210 requires 70 milliamperes at 24 volts DC for correct operation Included with each Model 210 is a 24 volt DC external power supply The power supply s DC output cable has been terminated with a Switch craft S760K coaxial power plug This locking type of plug correctly mates with the Model 210 s 24 Vdc input jack The locking feature is important allowing the external power source to be securely attached to the Model 210 As previously discussed in this user guide an IFB circuit connected to the IFB in put can serve as the Model 210 s power source Alternately an external 24 volt DC source can be connected For redun dancy both the IFB circuit and the exter nal source can be connected at the same time If one or the other becomes inopera tive the remaining source will provide all Model 210 power Note that if both an IFB circuit and an external 24 volt DC source are connected power will be drawn only from the exter nal source This minimizes the chance that lengthy cable runs or other IFB circuit Model 210 User Guide Studio Technologies Inc issues will impact Model 210 operation Whichever device is providing power audio signals from the IFB circuit can still serve as the audio sources for the head phone output Pushbutton Labeling The two pushbutton switches used in the Model 210 were selected for several reasons Foremost was the fac
67. ttenuation won t pose a prob lem Typically a device that receives the talkback signal such as an amplified loudspeaker will have an adjustable input sensitivity IFB Input The Model 210 s IFB input is designed to directly connect with wet DC biased IFB circuits These circuits provide DC power and one or two channels of audio over a standard 3 conductor microphone style cable Typically the IFB circuit s interface connector is a 3 pin male Issue 4 October 2008 Page 12 XLR type wired so that common is on pin 1 DC with channel 1 audio is on pin 2 and channel 2 audio is on pin 3 Some Circuits may only have one audio channel In this case audio will generally be on pin 3 with pin 2 providing only DC power The power supplied by an IFB circuit normally in the range of 28 to 32 volts DC is usually sufficient to operate the Model 210 s circuitry The acceptable input range is 24 to 32 volts with a required current of 105 milliamperes Note that the specified input voltage is given when measured di rectly at the Model 210 s IFB input connec tor not at the source of the IFB circuit The one or two audio signals provided by the IFB circuit can serve as the audio sources for the headphone outputs In North American field and in studio broadcast applications it is common to find RTS 4000 series IFB equipment being used to provide the IFB circuits The Model 210 can be directly connected to and fun
68. uch as the RTS 4000 series But actually having the cor rect level present on an IFB circuit is often a hit or miss proposition During field testing of prototype announcer s consoles Studio Technologies personnel found that a wide range of nominal audio levels were present on real world IFB circuits Many were fine being reasonably close to the desired 10 dBu But some were much too low while others were much too hot We observed one unfortunate baseball color commentator being sent interrupt audio signals so hot relative to program audio as to almost make his ears bleed This situation should not have been allowed to happen In defense of field technical personnel measuring the audio level of an IFB circuit hasn t traditionally been an easy proposi tion But that situation has now changed After experiencing this condition in the Issue 4 October 2008 Page 26 field Studio Technologies engineers were motivated to design the Model 72 Level Meter Interface This compact device plugs directly into IFB and intercom circuits and provides two useful functions level meters and dry audio outputs Two 5 segment LED meters allow direct obser vation of the audio signal levels present on IFB or intercom circuits The display range is optimized for the signal levels found on these circuits rather than traditional VU scaling The Model 72 also provides two trans former couple
69. utput from multiple units to be directly summed For non on air applications a special Model 210 feature can be enabled plac ing the unit in a production mode This allows the main output to be used as a second talkback output In this configura tion the unit can be even more powerful when used in a live event application such as serving as a master console for a production director Dynamic Range Control A studio quality compressor circuit is pro vided to control the dynamic range Issue 4 October 2008 Page 6 of the signal coming from the microphone preamplifier Far from a simple clipper the circuit utilizes a sophisticated laser trimmed voltage controlled amplifier VCA integrated circuit for quiet low distortion level control The signal from the compres sor is always used by the talkback output In addition the audio source for the main output can be selected to be either the output of the microphone preamplifier or the output of the compressor While possi bly not appropriate for major on air situa tions having dynamic range control of the main output can offer increased perfor mance for many applications These could include stadium announcement positions sports events using nonprofessional on air talent and situations where cable cross talk is of concern User Controls and Status Indicators Two pushbutton switches three LED indi cators and two rotary controls provide the user w
70. w P6 Talkback output pin 1 shield pin 2 high pin 3 low Careful Back panel 3 pin male XLR has pin 1 floating pin 2 high pin 3 low P7 IFB input pin 1 common pin 2 DC with channel 1 audio pin 3 channel 2 audio Follows back panel 3 pin female XLR pin assignment P9 External 24 volt DC input pin 1 com mon pin 2 24 volts pin 3 not used Back panel 2 1 x 5 5 mm jack has 24 volts on center pin Header P8 is used by the back panel 24 Vdc jack assembly and is electri Cally in parallel with 9 Additional functions can be accessed using these 3 position headers P10 Auxiliary input 2 pin 1 common pin 2 unbalanced audio 10 dBu nominal P11 Auxiliary input 1 pin 1 common pin 2 unbalanced audio 10 dBu nominal P12 Pushbutton backlighting pin 1 com mon pin 2 button lamps pin 3 current lim ited 24 volts from external 24 volt DC input P14 Remote switch connections pin 1 common pin 2 main output control pin 3 talkback output audio Pushbutton Backlighting For special applications provision has been made to allow illumination backlighting of the two pushbutton switches This may prove useful for applications where ad equate room lighting is not available It can also serve in custom Model 210 configura tions Note that this is an advanced feature intended only to be implemented by a qualified technician Issue 4 October 2008 Page 32 From the outset several limitations must
71. ways exceptions and that s why Issue 4 October 2008 Page 15 Model 210 Announcer s Console they were included It s possible that with a very hot microphone such as a phantom powered condenser type 20 dB of gain could be correct It s also possible that a microphone with a very low level output such as a ribbon type would need 60 dB of gain But in general the 30 40 and 50 dB gain settings will serve most applications Note that if no gain switch is set to its ac tive on position the preamplifier will oper ate at unity 0 dB gain In this mode the preamplifier remains stable but is intend ed for use only during factory testing A valid exception would be where a line level signal is connected to the microphone in put This could occur with a special Model 210 application But with a microphone connected as the input source one should never use the 0 dB setting The issue is that with no gain added to the microphone input signal the relative noise floor on the main and talkback outputs will be much too high These outputs are designed for handling line level signals expecting to receive the output of the mic preampli fier In conclusion the 0 dB gain setting doesn t highlight a problem but simply reflects the unit s gain structure Phantom Power On Off The Model 210 can provide 48 volt phantom power to the microphone input Switch SW1 8 controls whether or not phantom power is active By

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