Lectrosonics D4T DIGITAL MODULATION TRANSMISSION SYSTEM User Manual

Lectrosonics Inc DIGITAL MODULATION TRANSMISSION SYSTEM Users Manual

Users Manual

D4Digital Wireless SystemINSTRUCTION MANUALRio Rancho, NM, USAwww.lectrosonics.comFill in for your records: Serial Number: Purchase Date:
D4T/D4RLECTROSONICS, INC.2
4-channel Digital Wireless SystemRio Rancho, NM, USA 3IntroductionThe D4 digital 4-channel wireless system was de-signed as a special purpose system for location pro-duction in film and television.A typical application for this system is in television production as part of what is commonly called a “bag system.” A portable mixer and several wireless mi-crophone receivers are carried in an over-shoulder carrying case. The D4T transmitter is connected to the outputs of the mixer to transmit up to four audio chan-nels to one or more D4R receivers mounted on video cameras.The system is designed for line level analog audio sig-nals and AES/EBU digital audio signals and can be set up as a 2-channel or 4-channel system with options that provide: • Digitalin/Digitalout(<1mSlatency) • Digitalin/Analogout • Analogin/Digitalout • Analogin/Analogout(2.2mSlatency)In the 4-channel mode, the D4 system operates on one of four 4.2 MHz channels in the 902 to 928 MHz band. Each channel carries four separate audio sig-nals, digitally multiplexed within a common carrier. D4 systems can be run simultaneously on all four chan-nels across the 902 to 928 MHz band to provide a total of16channels.907.776 912.384 916.992 921.600902 to 928 MHz BandCenter frequencies of the RF channelsA “spreading” technique is used in the design to in-crease immunity to noise and interference. The sam-pled audio signals are delivered to the FPGA where the spreading algorithm and encoding are applied.The audio quality is suitable for any professional appli-cation in film, television and live sound. 48 kHz sam-pling and 24-bit A-D conversion assure excellent audio quality across a 20Hz to 20kHz audio bandwidth with only 0.05% distortion.The LCD interface on the front panels make setup simple and straightforward. Power is provided by exter-nalsourcesfrom6to16VDC.Rugged machined aluminum housings are finished in a Teflon impregnated nickle alloy plating with laser etched nomenclature for durability and legibility.Table of ContentsIntroduction .............................................................................3General Technical Description ..............................................4D4T Transmitter .....................................................................4D4R Receiver ........................................................................5Front and Rear Panels ............................................................6Transmitter Input Modes ........................................................7Receiver Output Modes .........................................................7Mixed Modes ...........................................................................7Navigating the LCD ................................................................7System Setup Steps ...............................................................8System Setup ..........................................................................8D4T Transmitter Audio Level Setup ......................................9D4R Receiver Audio Level Setup ..........................................9Antenna Placement and Orientation ...................................10Frequency Selection ............................................................10Replacement Parts and Accessories ..................................11Specifications .......................................................................12Service and Repair ...............................................................14Returning Units for Repair ..................................................14
D4T/D4RLECTROSONICS, INC.4General Technical DescriptionD4T TransmitterThe transmitter can accept up to four inputs from digi-taloranalogsources.Inputs1and2areselectablebe-tweentwodigitalchannelseachor1balancedanalogchannel each and inputs 3 and 4 can each accept a single balanced analog signal.The inputs can be configured as follows:• Fourbalancedanaloginputsusingallfourjacks• Twodigitalchannelsusingjack1andtwobal-ancedanaloginputsusingjacks3and4• Fourdigitalchannelsusingjacks1and2The input connectors are TA3 “mini XLR” types with the same pin numbering and configuration as standard XLR connectors for AES-EBU and balanced line level analog signals.Input preamp circuits use a special balanced amplifier withveryhighcommonmoderejectiontominimizehum and noise.Analog input signals are sampled at 48kHz and con-verted to 24-bit digital audio and fed into the FPGA for further processing. The FPGA applies a spreading algorithm to expand the bandwidth of each channel to 4,2 MHz to improve immunity to interference and noise. The baseband signal is then delivered to the D-A to generate the I and Q signals for final output.The modulated signal is filtered before and after the RF amp to suppress out of band noise and spurious signals. A circulator/isolator is used in the final RF output to minimize IM that can occur when external signals enter the output stage through the antenna. The isolator passes the transmitter output signal to the antenna but shunts returning signals to ground.A USB port is provided to simplify firmware updates.POWER AMPOSC900 MHzRFDEMODDIGITAL BASEBAND ENCODER24-bit D/A(analog)AES/EBU OUT(digital)24-bit D/A(analog)AES/EBU OUT(digital)24-bit D/A(analog)24-bit D/A(analog)TA3F INPUTSCIRCULATORISOLATORFILTER1234
4-channel Digital Wireless SystemRio Rancho, NM, USA 5D4R ReceiverThe receiver is essentially a mirror image of the trans-mitter. The incoming RF signal is converted back into the baseband signal that was generated in the trans-mitter, and the FPGA decodes the signal to generate the four audio channels in digital and analog formats as they appeared at the transmitter inputs.Diversity reception is employed to suppress multipath dropouts, followed by SAW filters in the front-end to attenuate signals above and below the passband. The FPGAmonitorsandadjuststheleveloftheincomingRF signal to increase the dynamic range capabilities of the receiver.From the IQ demodulator through the filters, amplifier and baseband ADC, the signal path and processing is the reverse of that in the transmitter. Decoding in the FPGA regenerates the original digital and analog audio signals and delivers them to the output stages.The FPGA also delivers a signal to a DAC and amplifer for monitoring with headphones. The headphone out-put follows the receiver selected on the front panel.FILTERFILTERLOWNOISEAMPLOWNOISEAMPOSC900 MHzRFDEMODRFDEMODDIGITAL BASEBAND DECODER andDIVERSITY SYSTEM24-bit D/A(analog)AES/EBU OUT(digital)24-bit D/A(analog)AES/EBU OUT(digital)24-bit D/A(analog)24-bit D/A(analog)TA3F OUTPUTS1234
D4T/D4RLECTROSONICS, INC.6Front and Rear PanelsSetup and operation of the transmitter and receiver is a straightforward process using an LCD and push but-ton interface on the front panels. The Main Window dis-plays audio levels during operation, with a setup menu and screens to select operating modes and levels.The rear panels provide the audio inputs and outputs, powerreceptacleandUSBport.Channels1and2provide balanced analog signals and AES-EBU digital signals as selected from the LCD setup screens. Channels 3 and 4 are balanced analog audio only. The connectors are standard TA3M type.D4T TransmitterFUNCBACKOFF ON1234DIGITAL 4 CHANNEL TRANSMITTERChannel Select 1-4Menu Item & Parameter SelectReturn to Previous MenuPress to Enter Setup MenusAudio LevelUSBAES 3/412349-16 VDC500 mAAES 1/2D4T 4-CHANNEL DIGITAL TRANSMITTERThe units are powered with an external source of 9 to 16VDC,withpowerconsumptionof500mAforthetransmitter and 250 mA for the receiver.The USB port is used for firmware updates.D4R ReceiverFUNCBACKOFF ON1234PHONESDIGITAL 4 CHANNEL RECEIVERChannel Select 1-4Menu Item/Parameter Select ButtonsPress to Enter Setup MenusReturn to Previous MenuChannel selected for headphone monitoringIncoming RF levelMenu Item & Parameter SelectAudio LevelUSBAES 3/412349-16 VDC300 mAAES 1/2D4R 4-CHANNEL DIGITAL RECEIVER
4-channel Digital Wireless SystemRio Rancho, NM, USA 7Transmitter Input ModesThe transmitter can be set up in three different con-figurations with the AES3 mode menu for 4-channel operation:CH 1CH 2CH 3CH 4ANALOGANALOGANALOGANALOGCH 1CH 2CH 3CH 4DIGITALDIGITALANALOGANALOGNOT USEDCH 1CH 2CH 3CH 4DIGITALDIGITALNOT USEDNOT USEDDIGITALDIGITALTwo different configurations are available for 2-channel operation:CH 1CH 2CH 3CH 4ANALOGANALOGCH 1CH 2CH 3CH 4DIGITALDIGITALNOT USEDNOT USEDNOT USEDNOT USEDNOT USEDReceiver Output ModesThe receiver audio outputs can be configured in the same manner as the transmitter for 4-channel opera-tion:CH 1CH 2CH 3CH 4ANALOGANALOGANALOGANALOGCH 1CH 2CH 3CH 4DIGITALDIGITALANALOGANALOGNOT USEDCH 1CH 2CH 3CH 4DIGITALDIGITALNOT USEDNOT USEDDIGITALDIGITALTwo different configurations are available for 2-channel operation:CH 1CH 2CH 3CH 4DIGITALDIGITALNOT USEDCH 1CH 2CH 3CH 4NOT USEDNOT USEDANALOGANALOGNOT USEDNOT USEDMixed ModesThe selected AES3 modes on the transmitter and re-ceiver do not have to be identical. For example, analog signals can be fed into the transmitter from a mixer or wireless mic receivers, transmitted to the D4 receiver, which can be configured for four digital outputs to feed a digital recorder.The sampling rate of the audio at the receiver digital outputs will always be at 48 kHz, regardless of the sampling rate of the signal fed into the transmitter.NOTE: Transmitter and receiver must both be set to either the 2-channel or 4-channel mode.Navigating the LCDNavigation through setup screens is the same on transmitter and receiver. The Main Window will display audio levels for all active channels while the system is operating. Press the FUNC button to enter the setup menu.FUNCBACKOFF ON1234DIGITAL 4 CHANNEL TRANSMITTERThen press the UP and DOWN arrow buttons to select a menu item.FUNCBACKOFF ON1234DIGITAL 4 CHANNEL TRANSMITTERPress the FUNC button to enter the setup screen for the selected item. Then use the UP and DOWN arrow buttons to select a value or mode.FUNCBACKOFF ON1234DIGITAL 4 CHANNEL TRANSMITTERPress BACK once to return to the Menu or twice to return to the Main Wiindow.
D4T/D4RLECTROSONICS, INC.8System Setup StepsThe following steps are necessary to set up and oper-ate the D4 system. Details for each step are on the next pages.1) Attachantennasandpowersuppliestothetrans-mitter and receiver.2) TuningMenu-selectthesameoperatingfrequen-cy on the transmitter and receiver.3) 2/4ChannelMode-set2-channelor4-channelmodes the same on transmitter and receiver.4) SelecttheAES3modesontransmitterandreceiv-er as needed for the connected equipment, mixer, recorder,etc.(seeAES3Modes)5) Adjustaudioinputlevelsonthetransmitter.(seeTransmitterAudioLevelSetup)6) Adjustaudiooutputlevelsofanalogoutputsonthereceiver.(seeReceiverAudioLevelSetup)7) Walktestthesystemtocheckforadequateop-erating range. If dropouts occur within the range needed, select a different operating frequency.System SetupTuning MenuUse UP/DOWN arrows to select menu item and press FUNC to enter setup Use UP/DOWN arrows to select channel, then press FUNC to return to menu 2/4 Channel ModesUse UP/DOWN arrows to select menu item and press FUNC to enter setup Use UP/DOWN buttons to select desired mode AES3 ModesUse UP/DOWN arrows to select menu item and press FUNC to enter setup Use UP/DOWN buttons to select desired mode Audio LevelUse UP/DOWN arrows to select menu item and press FUNC to enter setupNOTE: The setup screens for Audio Level on the transmitter and receiver will be slightly different. See the next page for details.Locked/Unlocked ModesUse UP/DOWN arrows to select menu item and press FUNC to enter setup Use UP/DOWN buttons to select desired mode
4-channel Digital Wireless SystemRio Rancho, NM, USA 9D4T Transmitter Audio Level SetupPress FUNC and then select the menu item “Audio Lev. “ and press FUNC again. The setup screen for audio level will vary slightly depending upon which AES3 mode has been selected. If the 2-channel mode has been selected, channels 3 and 4 will appear blank on the setup screen.Use UP/DOWN arrows to select menu item and press FUNC to enter setup When configured for four AES/EBU outputs, the channel levels will be preset to the AES standard. 12 3 4When configured for two digital and two analog inputs, press the button under the analog channel to be adjusted and then use the UP and DOWN buttons to set the desired level. 12 3 4In this example, the transmitter is configured for four analog channels. Select each channel with the button below it and use the UP and DOWN arrow buttons to set the desired level.NOTE: The transmitter is designed for line level signals. There is no gain stage in the input section. Attenuation up to 20 dB can be applied to the input signal to reduce very high level signals to the optimal range for the transmitter.D4R Receiver Audio Level SetupPress FUNC and then select the menu item “Audio Lev. “ and press FUNC again. The setup screen for audio level will vary slightly depending upon which AES3 mode has been selected. If the 2-channel mode has been selected, channels 3 and 4 will appear blank on the setup screen.Use UP/DOWN arrows to select menu item and press FUNC to enter setup When configured for four AES/EBU outputs, the channel levels will be preset to the AES standard. 12 3 4When configured for two digital and two analog inputs, press the button under the analog channel to be adjusted and then use the UP and DOWN buttons to set the desired level. 12 3 4When configured for four analog outputs, press the button under the channel to be adjusted and then use the UP and DOWN buttons to set the desired level.NOTE: The value shown in the setup screen on the receiver is the level of an analog signal in dBu at the output when the RF signal is fully modulated. AES/EBU outputs are preset to the industrystandardvalue,sonoadjustmentisneeded.
D4T/D4RLECTROSONICS, INC.10Antenna Placement and OrientationThe supplied antenna is a center fed half-wave type with a right angle elbow and rotating mount. For most applications, the whip antennas should be vertically oriented to provide a circular coverage pattern. In other orientations, the transmitter antenna should be paral-lel with and not directly above or below the receiver antennas.FUNCBACK1234DIGITAL 4 CHANNEL TRANSMITTEROFF OND4T TransmitterFUNCBACKOFFON1234PHONESDIGITAL 4 CHANNEL RECEIVERD4R ReceiverFrequency SelectionFor a single system, any of the four frequencies can be used for normal operation. With multiple systems oper-ating in the same location, select a different frequency for each system.Walk test each system through the area where it will be operating and listen for dropouts while observing the RF level indicator on the receiver LCD. It is best to have all equipment in the location turned on to check for interference and short operating range.If the RF level on the receiver LCD indicates a weak overall level, try re-positioning the antennas. Re-ori-enting the antennas or moving them even a few inches away from nearby surfaces can also make a difference.If dropouts are experienced during the walk test, but the RF level at the receiver remains strong, there could be interference on that frequency band. Switch the system to another frequency and walk test the system again to check for adequate operating range.
4-channel Digital Wireless SystemRio Rancho, NM, USA 11Replacement Parts and AccessoriesPower SupplyLectrosonics PS70 (non-locking) ACpowersupplywith60320universalsocketonhous-ing,100-240VAC,50/60Hz,1.6A(max)input;13.8VDC,2.8A,40W(max)output.SpecifytheACpowercord needed for your country or application.Power Input Plug and Cables• ShogyoMP121CRlockingplug(nocable)• Lectrosonics21425straight,non-lockingplugwith6ft.cable• Lectrosonics21472rightangle,non-lockingplugwith6ft.cable
D4T/D4RLECTROSONICS, INC.12SpecificationsOverall SystemOperating Spectrum: 902 - 928 MHz Center frequencies (MHz): 907.776, 912.387, 916.992, 921.600 Four systems can operate simultaneously for a total of 16 audio channels.Modulation Type: QPSK with spreading to 4.2 MHzSampling Rate: 48 kHzLatency (overall system): Digital In/Digital Out: Less than 1 mS Analog In/Analog Out: 2.2 mSSelectable Audio Channels: • 4 digital • 2 digital, 2 analog • 4 analogAudio Performance (overall system): Frequency Response: 20 Hz - 20 kHz THD: 0.05 %D4T TransmitterPower output: 200 mW; spreading algorithm across 4.2 MHz bandwidthPower requirements: 9 - 16 VDCPower consumption: 500 mADimensions: 4 x 4 x 1.5 inchesWeight:D4R ReceiverD4R ReceiverPower requirements: 9 - 16 VDCPower consumption: 250 mADimensions: 4 x 4 x 1.5 inchesWeight: 346 grams; 12.2 ozs.
4-channel Digital Wireless SystemRio Rancho, NM, USA 13Industry Canada Notices:Operationofthisdeviceissubjecttothefollowingtwoconditions:(1)thisdevicemaynotcauseinterference,and(2)thisdevicemustacceptinterference,includinginterference that may cause undesired operation of the device.This device has been designed to operate with the antennalistedbelow,andhavingamaximumgainof6dB. Antennas not included in this list or having a gain greaterthan6dBarestrictlyprohibitedforusewiththis device. The required antenna impedance is 50 ohms.Linx Technologies model: ANT-916-CW-HWR-RPSTo reduce potential radio interference to other users, the antenna type and its gain should be so chosen that theequivalentisotropicallyradiatedpower(e.i.r.p.)isnot more than that permitted for successful communi-cationFCC NoticeNOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuanttoPart15oftheFCCRules.Theselimitsare designed to provide reasonable protection against harmful interference in a residential installation. The equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:• Reorientorrelocatethereceivingantenna• Increasetheseparationbetweentheequipmentand receiver• Connecttheequipmentintoanoutletonacircuitdifferent from that which the receiver is connected• Consultthedealeroranexperiencedradio/TVtechnician for helpChanges or modifications to this equipment not ex-pressly approved by Lectrosonics, Inc. could void the user’s authority to operate it.
D4T/D4RLECTROSONICS, INC.14Service and RepairIf your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equip-ment needs repair. Make sure you have followed the setup procedure and operating instructions. Check the inter-connecting cables and then go through the Troubleshooting section in this manual.We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop attempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose con-nection,sendtheunittothefactoryforrepairandservice.Don’tattempttoadjustanycontrolsinsidetheunits.Once set at the factory, the various controls and trimmers do not drift with age or vibration and never require read-justment.There are no adjustments inside that will make a malfunctioning unit start working.Lectrosonics’ Service Department is equipped and staffed to quickly repair your equipment. In warranty repairs are made at no charge in accordance with the terms of the warranty. Out-of-warranty repairs are charged at a mod-est flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong as it does to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by phone for out-of-warranty repairs.Returning Units for RepairFor timely service, please follow the steps below:A. DO NOT return equipment to the factory for repair without first contacting us by email or by phone. We need to know the nature of the problem, the model number and the serial number of the equipment. We also need a phonenumberwhereyoucanbereached8A.M.to4P.M.(U.S.MountainStandardTime).B. Afterreceivingyourrequest,wewillissueyouareturnauthorizationnumber(R.A.).Thisnumberwillhelpspeed your repair through our receiving and repair departments. The return authorization number must be clearly shown on the outside of the shipping container.C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the proper packing materials. UPS is usually the best way to ship the units. Heavy units should be “double-boxed” for safe transport.D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or dam-age to equipment that you ship. Of course, we insure the equipment when we ship it back to you.Lectrosonics USA:Mailing address: Shipping address: Telephone: Lectrosonics,Inc.  Lectrosonics,Inc.  (505)892-4501 POBox15900  581LaserRd.   (800)821-1121Toll-free RioRancho,NM87174 RioRancho,NM87124 (505)892-6243Fax USA USA Web: E-mail: www.lectrosonics.com sales@lectrosonics.comLectrosonics Canada:Mailing Address: Telephone: E-mail: 49SpadinaAvenue,  (416)596-2202  Sales: colinb@lectrosonics.com Suite303A   (877)753-2876Toll-free Service:joeb@lectrosonics.com Toronto,OntarioM5V2J1 (877-7LECTRO)     (416)596-6648Fax
27 February 2009581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com(505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • sales@lectrosonics.comLIMITED ONE YEAR WARRANTYThe equipment is warranted for one year from date of purchase against defects in materials or workmanship provided it was purchased from an authorized dealer. This warranty does not cover equipment which has been abused or damaged by careless handling or shipping. This warranty does not apply to used or demonstrator equipment.Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot correct the defect in your equipment, it will be replaced at no charge with a similar new item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you.This warranty applies only to items returned to Lectrosonics, Inc. or an authorized dealer, shipping costs prepaid, within one year from the date of purchase.This Limited Warranty is governed by the laws of the State of New Mexico. It states the entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL, OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE EQUIPMENT.This warranty gives you specific legal rights. You may have additional legal rights which vary from state to state.

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