CVG-50V CVG-50A
Contents
1. Vd OOO 900 O O ge 2 2 e a 9 2 Q A UT ouTPUTS is Figure 1 CVG 50A Front Rear Panel Features Table 1 CVG 50A Front Rear Panel Features pee CIN Illuminated power switch on Supplies power to the unit front panel IN L R RCA connectors Audio input A a outputs connectors 5 12VDC feed connector A DC connector that allows power to be supplied to the unit An internal fuse holder houses the appropriate fuse 5 2 Getting To Know Your CVG 50V Amplifier The CVG 50V is a high quality state of the art video Distribution Amplifier designed for studios shops showrooms and other demanding applications The CVG 50V splits a single input source into five identical outputs The CVG 50V uses an external 12VDC power source and therefore is suitable for fieldwork as well Dozens of copies of videotapes can be made at the same time using several CVG 50V units chained through the looping inputs Front Rear panel features of the CVG 50V are described in Figure 6 and Table 7 NOTE For operation instructions refer to sections 9 1 9 2 1 5 Video Distributor OUTPUTS 3 Figure 2 CVG 50V Front Rear Panel Features Table 2 CVG 50V Front Rear Panel Features Illuminated power switch on Supplies power to the unit front panel Hi Z 75 Ohms switch Selects 750hm or HI z impedance pressed 750hm For looping select Hi z INPUT BN2. 1 Please note that if the output signal is disturbed or interrupted by very strong external electromagnetic interference it should return and stabilize when such interference ends If not turn the power switch off and on again to reset the machine 2 If the recommended actions still do not result in satisfactory operation please consult your CVG Dealer 10 11 1 Power And Indicators No Power Confirm that the rocker switch is in the ON position and that the red LAMP LED is illuminated Confirm that power connections are secured at the amplifier and at the receptacle Make sure the receptacle is active outputting the proper mains voltage gt For models CVG 50A CVG 50V perform the following Using a Philips screwdriver remove screws attaching the machine s cover Locate fuse holder located inside your amplifier Confirm that the fuse is good by looking for the wire connected between the ends of the fuse If this wire is broken replace fuse with another with the same rating Install cover by tightening the Philips screws 11 2 Audio Signal CVG 50A only No audio at the Output Confirm that your sources and output device are powered on and Device Regardless of connected properly audio signals connected to the input of your Input Selected amplifier should be properly wired to the output of your source audio signals connected to the output of your amplifier should be properly wired to the input of your amplifi
3. AC coupling is selected DC components of the incoming signal are removed DC coupling is always preferable since AC coupling might cause some linearity distortions in low and high frequencies due to non ideal behavior of capacitors A problem may arise when the incoming signal is riding on a DC offset especially when the acceptors are highly effected by deviation of DC offsets A to D converters for example which in turn results in a distorted picture Installing an Amplifier In a Mixed AC DC Video Audio System Video accessories use two basic forms of connection to sources and acceptors AC coupled or DC coupled Each form has its own advantages DC coupling provides a non distorted signal transferring accurately the DC contents of input signals to the outputs AC coupling suffers from problems related to bad quality low frequency response and the breathing effect However AC coupling isolates the acceptors from an erroneous DC level sometimes found in video sources If a video acceptor is too sensitive to the DC content transferred to it via the DA from the source AC coupling is preferred AC coupling may be initiated by either using a AC DC coupling switch available on some of the video DAs or adding DC removing components externally Perform the following steps if necessary 1 Connect the video source to the DA 2 Add external coupling capacitors to each output of the DA that needs AC coupling 3 Connect the acceptors to the o
4. with 750hm BNC connectors Check level controls located on your source input device or output device Noise bars roll up Hum bars ground loop are caused by a difference in the ground potential of or down in the output any two or more devices connected to your signal path This difference is image compensated by passing that voltage difference through any available or interconnection including your video cables Low frequency hum in the output signal WARNING Do not disconnect the ground from any piece of video equipment in your signal path Check the following to remove hum bars Confirm that all interconnected equipment is connected to the same phase of power Remove equipment connected to this phase that may be introducing noise such as motors generators etc Disconnect all cables and reconnect them one at a time until ground loop reappears Disconnect the affected cable and replace or insert an isolation device opto isolator or transformer in the signal path For Technical Support contact us at Comprehensive Video Group 55 Ruta Court South Hackensack NJ 07606 800 526 0242 e mail techsupport comprehensivevideo com www comprehensivevideo com 12
5. C connector Video input _ EA iaesnacatewlabacaincatsll outputs connectors AA ES ere ae An internal fuse holder houses the appropriate fuse INSTALLATION The amplifier is provided with four rubber feet packed in a separate bag Affix the feet to the unit place it on a table away from heat generating sources and make the required connections Use a rack adapter in case a rack installation is required see section 4 1 Rack Adapters in which case do not attach the feet 7 CONNECTING TO VIDEO DEVICES Video sources and output devices such as amplifiers or recorders may be connected to the amplifier through the BNC connectors CVG 50V models located at the back of the machine Please keep in mind that the output signal format will match that of the input signal format All signal connections that use more than one cable interconnecting between devices should be of equal length 8 9 1 9 2 9 3 9 4 CONNECTING TO AUDIO DEVICES Audio sources and output devices such as amplifiers or recorders may be connected to the amplifier through the RCA type connectors CVG 5A located at the back of the machines USING THE CVG VIDEO AUDIO AMPLIFIERS Powering On The Amplifier NOTES 1 Amplifier should only be powered on after all connections are completed and all source devices have been powered on Do not attempt to connect or disconnect any video audio or control signals to the amplifier while it is powered on 2
6. Comprenen envive DIVISION OF VCOM INTERNATIONAL MULTIMEDIA CORPORATION CVG 50V 1x5 Video Distribution Amplifier CVG 50A 1x5 Audio Distribution Amplifier USER MANUAL CONTENTS 1 INTRODUCTION 1 1 A Word On Distribution Amplifiers 1 2 Factors Affecting Quality of Results 2 SPECIFICATIONS 3 HOW DO I GET STARTED 4 UNPACKING AND CONTENTS 4 1 Optional Accessories 5 CVG SERIES AMPLIFIERS 5 1 Getting To Know Your CVG 50A Amplifier 5 2 Getting To Know Your CVG 50V Amplifier 6 INSTALLATION 7 CONNECTING TO VIDEO DEVICES 8 CONNECTING TO AUDIO DEVICES 9 USING THE CVG VIDEO AUDIO AMPLIFIERS 9 1 Powering On The Amplifier 9 2 Looping 9 3 Coupling 9 4 Installing an Amplifier In a Mixed AC DC Video Audio System 10 TAKING CARE OF YOUR AMPLIFIER 11 TROUBLESHOOTING 11 1 Power And Indicators 11 2 Audio Signal 11 3 Video Signal FIGURES FIGURE 1 CVG 50A FRONT REAR PANEL FEATURES FIGURE 2 CVG 50V FRONT REAR PANEL FEATURES FIGURE 3 INSTALLING AN AMPLIFIER IN A MIXED AC DC VIDEO AUDIO SYSTEM TABLES TABLE 1 CVG 50A FRONT REAR PANEL FEATURES TABLE 2 CVG 50V FRONT REAR PANEL FEATURES ovo o o O O WAN ODD On A FP UUO gt oo 111 11 12 1 1 1 1 2 INTRODUCTION Congratulations on purchasing your Video Audio Distribution Amplifiers This user manual describes the following products CVG 50A CVG 50V gt CVG 50A 1 5 Audio Distributor gt CV
7. G 50V 1 5 Video Distributor A Word On Distribution Amplifiers Distribution amplifiers are used to distribute one source to several acceptors for simultaneous recording or monitoring of one source with no discernible signal degradation They vary in the number of inputs looping capability programming capability number of outputs operating format bandwidth and input output coupling A good quality distribution amplifier amplifies the incoming signal pre compensates the signal for potential losses resulting from the use of long cables noisy source etc and generates several identical buffered and amplified outputs Factors Affecting Quality of Results There are many factors affecting the quality of results when signals are transmitted from a source to an acceptor Connection cables Low quality cables are susceptible to interference they degrade signal quality due to poor matching and cause elevated noise levels They should therefore be of the best quality Sockets and connectors of the sources and acceptors So often ignored they should be of highest quality since Zero Ohm connection resistance is the target Sockets and connectors also must match the required impedance 75 ohms in video Cheap low quality connectors tend to rust thus causing flaws in the signal path Amplifying circuitry Must have quality performance when the desired end result is high linearity low distortion and low noise operation Distance between sou
8. The socket outlet should be near the equipment and should be easily accessible To fully disconnect equipment remove power cord from its socket 1 Press the toggle switch on the far left front panel to the up position In the up position the toggle switch glows and the active input button illuminates as well 2 Operate the acceptors Looping The looping function enables the operator to extend the number of outputs per input The following example describes looping performed by using 3 amplifiers with one input and 5 outputs each A video signal reaches input of amplifier No 1 From looping connector of amplifier No 1 a cable is connected to input socket of amplifier No 2 The loop output of amplifier No 2 is connected to the input socket of amplifier No 3 In this way the input signal is divided into 15 separate output signals The operator must always switch to Hi z the termination switch of all the amplifiers but the last The last amplifier s termination switch should always be at 750hm to maintain well matched video line of 750hm impedance from first to last amplifier Note that if looping function is not used the termination switch should be set to 75 ohm Coupling The coupling function enables the operator to determine whether the incoming video signal is DC or AC coupled When DC coupling is selected and proper standard video signal is applied to the amplifier s input the output signal is equal to the input signal When
9. contact your CVG dealer v Optional Accessories The following CVG accessories can enhance implementation of your amplifier gt Rack Adapter Used to adapt non standard size machines to a standard 1U rack One or more machines may be installed on each adapter gt BNC Y Connector Used for looping purposes and splits the incoming signal to enable connection of an additional machine gt Termination Plug Used to terminate the line to 750hm for proper matching CVG SERIES AMPLIFIERS This section describes all the controls and connections of your amplifier Understanding all of the controls and connections helps you realize its full power Getting To Know Your CVG 50A Amplifier The CVG 50A is a high quality state of the art stereo audio Distribution Amplifier designed for studios shops showrooms and other demanding applications The CVG 50A splits a single stereo input source into five identical outputs The CVG 50A uses an external 12V DC power source and therefore is suitable for fieldwork as well The machine has unique built in circuitry which allows high signal level processing even while using a 12VDC power source The CVG 50A machine is a perfect match to the CVG 50V 50S video s video DAs Front Rear panel features of the CVG 50A are described in Figure 3 and Table 3 NOTE For operation instructions refer to sections 9 1 v POWER O 1 5 Audio Distributor
10. er or recorder Confirm that any other amplifiers in the signal path have the proper input and or output selected Pay special attention to input amplifiers that may be built into your amplifier or recording device Audio level is too low Confirm that the connecting cables are of high quality and properly built Take special care in noting the wiring configuration of balanced to unbalanced cables Check level controls located on your source input device or output device 11 11 3 Video Signal CVG 50V only No video at the Confirm that your sources and output device are powered on and output device connected properly Video signals connected to the input of your regardless of input amplifier should be of an identical signal format at the output of your selected source Video signals at the output of your amplifier should be of an identical signal format as at the input of your display or recorder Confirm that any other amplifiers in the signal path have the proper input and or output selected Video level is too The amplifiers in this manual except for the CVG 2N have termination high or too low switches on each input Verify that the video line is well interfaced through 75ohm impedance otherwise it results in a video level that is too high or too low Check if looping is used and if termination switch is in the proper position for this state Confirm that the connecting cables are of high quality properly built and terminated
11. mination switch Input Level 1Vpp 750hm Output Type 5 video Output Connector BNC connectors Output Level 1Vpp 750hm Output Coupling AC S N Ratio 73db Audio Bandwidth NA Video Bandwidth 480MHz 3dB Max audio Output NA Max video Output 2Vpp Differential Gain 0 05 Differential Phase 0 12Deg Audio THD N NA K Factor lt 0 05 Level Controls Gain Range 0 8 to 1 9db EQ control 0 to 3 2db Gain Range 0 8 to 1 9dB Dimensions W D H 16 5cm x 12cm x 4 5cm 6 5 x 4 72 x 1 77 Weight 0 62Kg 1 4lbs HOW DOI GET STARTED The fastest way to get started is to take your time and do everything right the first time Taking 15 minutes to read the manual may save you a few hours later You don t even have to read the whole manual At the beginning of each section you ll find an overview of the section So if the section doesn t apply to you you don t have to spend your time reading it UNPACKING AND CONTENTS The items contained in your CVG amplifier package are listed below Please save the original box and packaging materials for possible future transportation and shipment of the amplifier 4 1 5 1 gt Desktop size amplifier gt AC power cable where applicable gt User s Manual Rubber feet For additional information regarding optional cables and additional accessories
12. rces and acceptors Plays a major role in the final result For long distances over 15 meters between sources and acceptors special measures should be taken in order to avoid cable losses These include using higher quality cables or adding line amplifiers Interference from neighboring electrical appliances These can have an adverse effect on signal quality Balanced audio lines are less prone to interference but unbalanced audio should be installed far from any mains power cables electric motors transmitters etc even when the cables are shielded 2 SPECIFICATIONS Configuration 1 5 Input Type 1 stereo audio Input Connections RCA Input Level Looping 4dbm 50kohm Output Type 5 stereo audio Output Connector RCA connectors Output Level 4dBm 1000hm Output Coupling AC S N Ratio 83db unweighted Audio Bandwidth 50khz 3db Video Bandwidth NA Max audio Output 25Vpp Max video Output NA Differential Gain NA Differential Phase NA Audio THD N lt 0 018 Second harmonic 0 003 K Factor NA SDI eff Range NA Dimensions W D H 16 5cm x 12cm x 4 5cm 6 5 x 4 72 x 1 77 Weight Power consumption 0 62Kg 1 4lbs Approx 0 78VA 3 SPECIFICATIONS continued Configuration 1 5 Input Type 1 video looping Input Connections BNC connector with ter
13. utputs of the DA Connect the DC coupled acceptors directly and connect the AC coupled acceptors via back to back connected 1000uF 25V capacitors A useful tip The capacitor may be stitched on the coaxial cable directly by carefully separating the shield from the signal leading conductor cutting this conductor and connecting the capacitor serially POWER Video Audio Distributor Q L O LEFT RIGHT 230 vA VIDEO IN TERM OUT1 OUT2 OUT3 OUT4 OUTS AUDIO IN 50 60 Hz FUSE Video source DC coupled video acceptor DC coupled L a OUT 2 R L OUT 3 R i 1000u4F 1000F am Capacitor Capacitor AC coupled video acceptor 10004F 1000F pz rel Capacitor Capacitor AC coupled video acceptor Figure 3 Installing an Amplifier in a Mixed AC DC Video Audio System 10 TAKING CARE OF YOUR AMPLIFIER Do not locate your amplifier in an environment where it is susceptible to dust or moisture These may damage the electronics and cause erratic operation or failure Do not locate your amplifier where temperature and humidity may be excessive Do not clean your amplifier with abrasives or strong cleaners Doing so may remove or damage the finish or may allow moisture to build up Take care not to allow dust or particles to build up inside unused or open connectors 11 TROUBLESHOOTING NOTES
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