Wohler ATSC-1 Manual Download Page 22

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Wohler Technologies, Inc.

31055 Huntwood Avenue

Hayward, CA 94544

Phone:

(510) 589-5676

Fax:

(510) 870-0811

US Toll-Free:

1-888-596-4537

web:

www.wohler.com

e-mail:

[email protected]

You can now contact us at:

Wohler

Technologies, Inc.

31055 Huntwood Avenue

Hayward, CA 94544

Phone:

(510) 870-0810

Fax:

(510) 870-0811

US Toll-Free:

1-888-596-4537

www.wohler.com

[email protected]

Summary of Contents for ATSC-1

Page 1: ...evelMeteringDescription AnalogInputBlockDiagram InterconnectBlockDiagram ATSC 1 2U Monitor Speaker Unit with 6 Analog Inputs Selected Analog Outputs Headphone Output 6 Channel Monitoring 6 Level Meters and Phase Indication Document P N 821509 Rev C CONTENTS Note This manual is specifically applicable to the standard version of the ATSC 1 For information about any custom options which are installed...

Page 2: ...acles and the point where they exit from the apparatus 11 Only use attachments accessories specified by the manufacturer 12 Use only with the cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over 13 Unplug this apparatus during lightning storms or when unus...

Page 3: ... of the chassis ears This feature will reduce or eliminate rear bracing requirements in many mobile portable applications The weight of internal components is distributed fairly evenly around the unit Audio Connections Connection of the audio feeds is straightforward The system block diagram located on page 24 may be referred to for clarification of the general signal paths into and out of the ATS...

Page 4: ...whileinuse Six wide range LED bargraph level meters are provided for all six channels for accurate metering Twenty bicolor segments display signal levels according to either PPM andVU standards as selected by the user BothLeft RightandFront Rear Surround Phase PolarityLEDindicationsareprovided toalertofpossiblecancellation frommixdowninanylikelyhomeplaybacksituation Toisolatepossiblefaults rotarys...

Page 5: ...itors Designedforoptimumreproductioninrelativelyclose upuse the ATSC 1 unit has more than enough acoustic output even for noisy transmitter sites 104 dB SPL at two feet and a surprisinglybroadandsmoothuseablefrequencyresponseof40Hzto18kHz Designed built andrigorouslytestedintheU S theATSC 1monitorisbackedbyastrongtwoyearwarrantyanda satisfactionguaranteed returnpolicy On special order custom combi...

Page 8: ...e Dynamic range for these meters is 43dB and they are able to display signal levelsusingeitherPPMorVUstandardsassetbytheuserviaDIPswitchesaccessiblethroughthetopcover seeDIP swich settings in Fig 1c on page 18 Each meter is labeled on the front panel according to the standard Surround Soundnomenclature leftfront rightfront center lowfrequencyeffects leftsurround andrightsurround Contactthefactoryf...

Page 10: ...he right speaker Note This functionisdisablediftheALL SELECTEDtoggleswitch Item9 ininthe ALL position 9 ALL SELECTED Channel Monitoring Toggle Switch When this two position toggle switch in in the ALL position all six channels are monitored in a stereo mixdown throughbothleftandrightspeakers Wheninthe SELECTED position channelselectiondefaultstotheLeftSpeaker Select rotary switch Item 7 and Right ...

Page 12: ... connectors and are configured for balanced 100K Ohm Unbalanced signals may be connected between either pin 2 or pin 3 and pin 1 In the case a jumper must be added to connect the unused input 3 or 2 to pin 1 From left to right as viewed from the rear of the unit the inputs are labeled L Front R Front Center LF EFX L Surr and R Surr in keeping with standardSurroundSoundnomenclature AlthoughtheATSC ...

Page 15: ... 2006 Wohler Technologies Inc ALL rights reserved 15 Section 2 Technical Support Service and Toubleshooting Guide Audio Circuit Description Phase Indication Interconnect Block Diagram ...

Page 16: ...evel meters and the phase indicator are immediately after the input stage and before the volume control section The signal pick off for the headphones is after the volume and balance controls Analog switches mute the speakers controlled by circuitry which senses connection of headphones to the jack The power amps are attached to an aluminum heatsink plate which is also connected to the circuit com...

Page 17: ...lugging headphones in provides a shunt path to ground for this DC through the headphones whichturnsoff transistorQ11 Thissetspins9 10 and11onanalogswitchIC16high whichswitchesthesignalsthatnormally go to the speaker amps to AC ground bias instead The RC networks of C49 and C50 R74 through R76 filter any high level low frequency transients which might otherwise affect Q11 Note that for this sensing...

Page 18: ...r com ipi htm has animated simulations of bothtypesofphaseindicatordisplays older4 LEDdiamond newer3 LEDtype astheyappearwithvarioustypesofinput signals Itshouldbenotedthatboththeoriginalandthenewcircuitsmaketheir phase polarity determinationsonindividual excursions of the input signals The average indication on the new type is derived by integrating the instantaneous determinations Duetothehighly...

Page 19: ...hLM391x display drivers The LED drive current brightness is about 10x the current taken from pin 7 Pins 6 and 4 are the top and bottomconnectionstothereferencedividersinsidethedisplaydrivers ThevoltageacrossR1 P1 R2 andDP1isthereference against which the rectifier output applied to pin 5 is compared The meter zero level is calibrated by adjusting P1 Refer to National Semiconductor Linear data book...

Page 22: ...d CA 94544 Phone 510 589 5676 Fax 510 870 0811 US Toll Free 1 888 596 4537 web www wohler com e mail support wohler com You can now contact us at Wohler Technologies Inc 31055 Huntwood Avenue Hayward CA 94544 Phone 510 870 0810 Fax 510 870 0811 US Toll Free 1 888 596 4537 www wohler com support wohler com ...

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