Time Code Distributor - Brainstorm Electronics
Contents
1. 17 Negative 4 Positive Channel 6 16 gt Ground 8 gt Negative 15 Positive 2 Ground 14 Negative 1 gt Positive Channel 7 Channel 8 1066006000006 L9 eee oeoeoee SR 28 User Manual Page 5 APPENDIX B USING AN EXTERNAL SWITCH FOR INPUT SELECTION When necessary an external switch can be used to change the SR 28 input selection Wire it to the 2 pads labeled EXTERNAL SWITCH CONNECTION on the mother board A 2 pin header can be soldered in the mother board with a connector at the end of the wires for easy disconnect This external switch should be momentary SPST and will operate in parallel with the front panel switch Either one can be used The front panel LED always indi cates the currently selected input Booo Specifications 2 x 8 w input selector INPUT Signal ee OUTPUT 6000 balanced 3000 unbalanced Level full off to 10dbU balanced to 4dbU unbalanced front panel pots adjustable Waveform 25ps SMPTE 50ps EBU or 1ps square wave selectable rise time on board jumpers Amplitude less than 2 Distortion CONNECTORS Inputs XLR Female 2 Pins 3 high 2 low 1 ground Sonniers fier DB25 Female 8 channels ee 12VDC 1 3A universal supply provided2. INSTALLING THE SR 28 The SR 28 is designed to be mounted in a standard 19 rack It is 1U in height Usual precautions should be respected when wiring the SR 28 use high quality cables with good shield to guarantee a good signal transmission Keep your cables as short as possible To preserve the integrity of the transmission line it is recommended that you do not mult a single output to multiple devices as it can degrade signal quality Page 2 SR 28 User Manual 3 O s Description and Cable Requirements oO 3 1 POWER The SR 28 requires 12VDC 1A Acceptable range is 12VDC 15 The external supply provided with the SR 28 accepts 100 to 240 VAC input at 50 60 Hz so it is suitable for use anywhere in the world Optionally a second power supply can be connected to Power Input B for redundancy see 4 4 below To order a second power supply p n PS 7 contact your dealer gt Insert the 4 pin plug into the rear panel jack and secure by screwing the ring Plug the supply into the wall outlet using the standard IEC cable supplied 3 2 TIME CODE INPUTS Accepts any time code format at speeds ranging from 1 30x to 60x playspeed Connectors XLR female gt Use a standard audio cable Pin 2 Hot Balanced or unbalanced systems 3 3 TIME CODE OUTPUTS Connector 25 pin D Female See Appendix C for wiring diagram gt Use standard Tascam Avid Digidesign analog audio pin out configuration and if needed a
3. 28 User Manual nents from its waveform However some equipment may not be able to read time code if its rise time is too long The SR 28 has three preset rise times for its output waveform 25 psec SMPTE Ipsec square wave and 50psec EBU Reshaped Code Reshaped Code Reshaped Code SMPTE setting 25us Square setting 1us EBU setting 50us As a general rule if time code is patched directly into a reader use the square wave position but whenever possible cross talk problems exist i e in an audio patchbay or when recording the reshaped signal use the SMPTE or EBU setting as needed The rise time is set by default to square wave To change it to one of the other presets move the internal jumper as shown below Te eis pil Bit Bie Bie oie ole G T3 g ro Jaata oo oo O poog me a Ha FE Dame Cse 6 7 e OF 6 Appendix APPENDIX A 25 pin D CONNECTOR WIRING DIAGRAM The diagram below shows the pin out for the 25 pin D Sub connector outputs 1 8 13 gt na 25 amp Ground 12 gt Negative 24 Positive 11 gt Ground 23 gt Negative 10 Positive Channel 1 Channel 2 22 Ground 9 gt Negative 21 Positive 8 Ground Channel 3 20 gt Negative Channel 4 7 Positive EF s l 6 gt Negative Channel 5 18 Positive Ground
4. BRAINSTORM ELECTRONICS INC www brainstormtime com Distributed Exclusively by plus24 1155 N La Brea Avenue West Hollywood CA 90038 USA Tel 323 845 1171 Fax 323 845 1170 www plus24 net Time Code Distributor Operation Manual P BRAINSTORM jy mea Intelligent Solutions For The Recording Studio SR 28 User Manual Page 1 1 Introduction Congratulations on purchasing the SR 28 Time Code Distributor The SR 28 is a high quality reshaper designed to recondition very low level or amplitude distorted time code into a properly shaped waveform and to distribute it through its 8 individually buffered outputs Each output has it s own level adjsut pot There are 2 separate time code inputs that can be selected via a front panel switch or alternatively via an external remote switch Two separate power supplies can be connected into the SR 28 for redundancy FRONT PANEL SELECTOR EXTERNAL SWITCH INPUT A Gz T I INPUT SELECTOR RESHAPER INPUT B y a os E gt E on J EJIE Ifo ey fea I iP Se E 7 es A a F a f IE I 1 Ty OOKKII QOOOQ POWER SUPPLY OUTPUT 8 2 Installation 2 1 UNPACKING When unpacking your SR 28 the following items should be in the shipping carton SR 28 unit Universal Power Supply 12VDC 1 3A IEC power cable Owner s Manual amp Registration card 2 2
5. lure protection the 2 power supplies should be on separate mains circuits 5 Reshaping and distributing time code 5 1 TIME CODE DISTRIBUTION Simply multing a time code source to multiple destinations can cause serious problems and is not recommended The SR 28 eliminates these potential problems by providing 8 individually buffered and balanced outputs 5 2 RESHAPING DISTORTED TIME CODE On older analog tape machines especially VTR s time code usually has improper rise fall times leading edge peaking and different amplitude levels on one s and zero s With more modern equipment the signal is usually cleaner but can also get distorted by long cable runs and poor connections aes iu Analog tape machine Analog tape machine Analog tape machine lay Speed High Speed Low Speed As a result time code can become unreadable The SR 28 eliminates these amplitude distortions by reshaping the code to its original specifications 5 3 TIME CODE LEVEL Level fluctuations or improper level can also render time code unreadable With the SR 28 each output is individually adjustable so that optimum levels can be sent to each reader These levels remain constant regardless of input fluctuations 5 4 SELECTING THE PROPER RISE TIME Rise time limiting was specified in SMPTE and EBU to minimize crosstalk from time code into audio A longer rise time removes more high frequency compo SR
6. readily available DB 25 male to 8 XLR male break out cable from third party companies 4 Front Panel Switches amp LED S SR 28 TIME CODE DISTRIBUTOR XY e irs BRAINSTORM d 4 1 INPUT SIGNAL LED S These 2 LED S indicate that a signal is present at the corresponding input 4 2 INPUT SELECTOR amp LED S Tap the SELECTOR button to toggle between the 2 inputs One of the 2 LED s lights up to indicate which input is currently selected If necessary an external selector switch can be used see appendix B 4 3 OUTPUT LEVELS The level for each of the 8 outputs is adjustable via 8 front panel pots Levels go from full off to 12db SR 28 User Manual Page 3 4 4 POWER To turn the unit on tap the Power button There will be a small delay before the unit actually turns on To turn the unit off hold the Power button for about 2 seconds When the SR 28 is turned on the Power A and or Power B LED s light up to indicate that power is present at the corresponding connector When the SR 28 is off these LED s stay off even with power present at the connector REDUNDANCY The SR 28 has 2 power inputs and allows for 2 separate power supplies to be connected simultaneously If one of the supplies fails the second one will keep the SR 28 running The LED corresponding to the faulty supply will start blinking to alert you You can then replace it without having to power down Note For better fai
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