1i zIbl Clear Corm - Zasco Productions, LLC
Contents
1. 2 3 4 To install the 111 a P Box Remove the plastic screw termi nal block from the header on the 111 PC Board pull straight up to lift block off A similar terminal block wired to the P Box s 3 nectors plug that block onto the KB 1lllA s 5 pin header terminal block and the PC Board are clearly labelled with the pin numbers to ensure proper connections See Figure 5 Por table Unit Connection Because the P Box accepts one channel the KB 111A s Channel Select toggle switch is inef fective No matter which posi tion this switch is in the KB 111A operator communicates the one channel that s fed into the Attach the 111 to the front of the P Box using the supplied screws If desired attach the handle and the protective rubber feet onto the suitable sides The enclosure also has cut outs INTERCOM FRONT PANELS Remove original terminal block PC Attach rubber feet to P Box peel off paper backing and wm gt COP UND Figure 6 Portable Box Connections block onto header TB1 on each side for hanging it from the wall a console where ever Use standard two conductor mic ble i e 8413 with 3 connectors to interconnect the por table station within the intercom system The pin out assignment for each XLR conne2. 111 Speaker Station INSTRUCTION and SERVICE MANUAL Clear Com Intercom Systems 945 Camelia St Berkeley California 94710 510 527 6666 Clear Com 810026 8 15 88 REV C HK KK KKK RE KR KK OK OE KE KKK KKK KK RRR KKK KK KKK EK KEKE DOCUMENTATION ADDENDUM 11 MANUAL kk November 17 1987 kx i k4 HAE KK ko x ok x ck ok oko MIC TO LINE GAIN LEVEL INCREASE In effecting a 44B Mic to Line increase in gain level the following changes have been made 210 27 1 CLEAR COM KB 111A SPEAKER STATION INSTRUCTION amp SERVICE MANUAL TABLE OF CONTENTS Section Page Introduction to the 111 1 II Headsets and Mics Ra TETTETETT 1 III 11 3 IV Operating Controls TETTETETT 7 V Parts Listing eac VI Specificatlons 8 VII Call Signalling Modification 9 Illustrations Figure 1 Headset Y Cable m e 2 s nace 2 Figure 2 Headset Extension Cord 2 Figure 3 KB 111A Mounting Dimensions 4 Figure 4 KB 111A Block Diagram 4 Figure 5 Two Channel Interconnect Wiring 5 Figure 6 Portable Unit 6 Figure
3. page 5 for examples of 111 Two Channel Wiring THE PORTABLE 111 The KB 111A may be mounted inside the Clear Com Model there by becoming a portable Remote Sta tion The P Box is supplied with a handle rubber feet and screws for attaching the handle and the intercom to the enclosure When the KB 111A is mounted in the P Box only one channel can be used for communication The wiring in the P Box contains a jumper to defeat the Station s Channel Select switch The portable Station connects to the intercom system with the 3 pin XLR connectors located the side of the There female connector for input and one male connector for extending the intercom line to other Remote Stations Inside the P Box the connectors are wired to 5 terminal strip which you plug onto the header on the 111 PC Board Refer to Figure 6 Portable Unit Connections page 6 continued MOUNTS IN A 6 8 BACK kes 3 FIGURE 3 KB IIIA MOUNTING DIMENSIONS 111 BLOCK DIAGRAM CALL 2 a fe 1 901 S34IM 123 OL 2018 NOILONnf YO 3131 TVNIWH31 31vuvd3s ISN 719018 HOLO3NNOO NOLLVIS NI 14 LON OG S3MIM di 3LON 5 HOLOnQONOO SI AYNSOTONS di 9 HiNV3 OL 193NNOO T3NNVH2 OML NOILVTIVLSNI aaxid VLLL gM 1
4. the sidetone once if at all even if other stations subse quently join or leave the intercom system Adjusting the sidetone does not affect the level of incom ing or outgoing signals The sidetone control is inside a hole next to the Volume knob Use a small blade screwdriver for ad justment At the factory Clear Com sets the sidetone to be approximately 6 dB lower than incoming signals If you want to change this level take these steps 1 plug in headset 2 turn on mic 3 turn up volume all the way 4 insert screwdriver into hole and engage the slot on the trimpot inside 5 begin talking into mic while slowly turning screwdriver the volume of your voice will rise or drop When using both the headset and the speaker set the Sidetone for maximum null you can t hear yourself Cal 1 The black push button activates the visual signal circuit that s stan dard on Clear Com intercoms It allows the intercom user to attract the attention of operators who have removed their headsets turned off their speakers Call signalling follows the position of the Channel Select switch for instance if you are using Channel A pressing the Call button activates the signal circuitry at all stations that are assigned to Channel As long as you keep the button pressed the Call circuit will stay active The Call button also activates the speaker and or mic at any other Station on the same channel that is set
5. 7 Alternative Signalling sU eig accu fa 9 Figure 8 KB 111A Schematic 10 NOTICE While Clear Com makes every attempt to maintain the accuracy of the information contained in its change without notice product manuals the information is subject to INTRODUCTION TO THE 111 REMOTE STATION The Clear Com 111 is a Remote Speaker Station that provides talk listen communications on one of two channels within our closed circuit intercom system It features a wide frequency response high out put speaker and the ability to operate with a carbon headset OR a dynamic headset handset or push to talk mic The KB 111A features the Clear Com contoured frequency response for consistently excellent speech telligibility in all surroundings The speaker delivers crisp sound pressure levels clearly audible in high or low noise environments The Remote Station features Automa tic Headset Detection its built in mic preamp automatically shuts off when the headset is disconnected eliminating noise pick up on the intercom line The intercom cir cuitry incorporates a mic limiter which assures constant talk levels and prevents overload The KB 111A s speaker can remain on at all times or you can turn it off that private conversations may be carried out with a headset or telephone handset three position mic switch allows you to 1 keep the mic on at all time
6. ONS PIN 3 HEADPHONE GROUND Pin 4 HEADPHONE HOT FIGURE 2 HEADSET EXTENSION CORD SHIELDED PAIR greater isolation from ambient noise Clear Com also offers Model HS 6 a telephone style handset with a dynamic mic and push to talk switch is interchangeable with the above headsets All units have field replaceable cords The KB 111A drives two dynamic headsets with only a slight 3 dB reduction level Clear Com supply you with Model YC 100 Y Cable which allows you to plug two headsets into the one D4M connector on the Station s front panel Alternately you may construct your own Y cable we recommend you use Belden 8416 or the equivalent 2 conductor 25 gauge or Belden 8734 or the eqivalent 3 conductor 22 gauge See Figure 1 You can also build an extension cord for a dynamic headset using the cable specified above Limit its length to 15 feet or less greater lengths lead to possible capacity coupling between the mic signal and the headset signal which causes oscillation or a loss in frequency response See Fig 2 CAUTION DO NOT CONNECT MIC GROUND amp HEADPHONE GROUND TOGETHER ANY POINT CAUTION NOT CONNECT MIC GROUND amp HEADPHONE GROUND TOGETHER II KB 111A INSTALLATION The KB 111A connects to the inter com system with a five screw termi nal strip which is located on the Board Route two pair indi vidually shielded cable B
7. ctor is Pin 1 common Pin 2 30 volts DC Pin 3 intercom audio Route cable from the Main Station Power Supply another Remote Station to the portable 111 and input to the female connector Use the male output connector to daisy chain the intercom line between the 111 and another portable Remote Station A diode in the DC input of the 111A protects the circuitry against wiring in the interconnect cables All Remote Stations bridge the terminated audio line with approxi mately 15k ohms 111 OPERATING CONTROLS Chan Select This toggle switch selects the channel on which the operator will communicate This switch is de feated when the 111 is mounted in a P Box Volume This knob adjusts the listen level for the speaker headset Speaker This toggle switch determines the activity of the speaker Mic On Off 0On This three position toggle switch determines the activity of the microphone in your headset hand set or gooseneck When the switch is set to the top on position the mic remains on When it s in the middle position the mic off The bottom on position is a momentary setting Sidetone Adj The sidetone control enables the 111 operator to adjust the level of his her voice as heard the Station s speaker or headset allowing up to 35 dB reduction of acoustical pick up You need only adjust
8. el den 8723 from a Main Station or Power Supply output connector to the location of your Remote Station or route two separate two conduc tor mic cables per channel Each channel must be fed within its own shield although unshielded cable may be used when run in conduit The KB 111A can be mounted in a cut out in any surface or it can mount inside a 6 by 8 Black electrical Box minimum depth 3 See figure 3 for dimensions After preparing a surface for stallation bring wiring into the header the terminal strip While making connections refer to the lable adjacent to the terminal strip it identifies each pin by assignment Connect the leads according to the label shown above to prevent ground loops and buzzes the common terminal pin 5 should NEVER be directly connected to chassis ground pin 1 Use conduit or a separate wire to interconnect two or more 111 Stations to pin l If you plan to use only one channel on the 111 disable the Channel Select switch by jumping Channels A and B together on the connector block and hook the intercom audio line to either terminal 2 or 3 If you don t disable the Channel Select switch and are only using one channel you must be sure to keep the Channel Select switch set to the active channel If you switch to the unconnected channel the Station will exhibit disturbing oscillation See Figure 5
9. eries between the two channels on the intercon You can alter this configuration by cable Call signalling is now making the modification described possible from Channel to Channel below B Since the Call signal follows the direction of the diodes this In our application Figure 7 a is one way signalling Channel group of two channel stations cannot send a signal to Channel A FIGURE 7 ALTERNATIVE SIGNALLING Remote Remote Station Station TWO CHANNEL MAIN STATION or POWER SUPPLY Remote Remote DIODES 4 Station Station 914 Type 2 Ch 2 Ch 111 SCHEMATIC Figure 8 TaNNWHD 61559 2 59 022 Mes T 2 4 8 5 ASE Alz vu Y2 52290 HAOS 32405224 Pe sf 3Wn1394 AONB LNI 0 2 792 3S1 Sev gt acu 925 e2u vou 2 390 29 12 0 9 2 amp 9N G dW 20 Va 9 SNid 4 SOW ONIN NI S3A11VA YALIN 11V SWHO WOLSISBY TW TOJ IDAdS ASIMYSHLO 4 SION 900LW BVA 024 12 92 988 4 2 62 2 4 2IWNNAO 2r 2 TOZD IT WLP 203 612
10. lk listen capability on one channel Standard two conductor shielded mic cable interconnects stations within the intercom system The KB lll s built in headset speaker amplifier can drive a stan dard headset to levels greater than 110 dB SPL The Station s mic preamp automatically shuts off when the headset is disconnected there by eliminating hum pick up NOTE If you use a carbon headset and a dynamic headset simultaneous ly the listen level the carbon headset drops audibly The carbon headset connections are Ring Headphone Tip Sleeve Ground The D4M connector pins are Pin l Mic Ground Pin 2 Mic Hot Pin 3 Headphone Ground Pin 4 Headphone Hot To assure proper level and perfor mance the dynamic headset should have the following characteristics Microphone type dynamic Impedance 150 250 ohms Output level 55 dB Headphone type dynamic Output impedance 300 2000 ohms Clear Com offers three dynamic headsets all with boom mounted noise cancelling mics Model CC 2408 is a double muff and Model CC 75B is single muff both have boom activated mics with on off swit ches Model PH 7 is a very rugged double muff high fidelity headset with wider frequency response and PIN 1 MIC GROUND PIN 2 MIC HOT 15 PIN 1 MIC GROUND PIN 2 MIC MO PIN 3 HEADPHONE GROUND Pin 4 HEADPHONE HOT FIGURE 1 HEADSET Y CABLE CONNECTI
11. s 2 activate the mic momentarily 3 switch off the mic so the 111A can function as a listen only station II HEADSETS AND MICS To provide you with the ability to talk on the intercom channel the 111 contains one 1 4 phone jack for stan dard carbon headset AND one 4 pin male XLR type connec tor D4M for a dynamic headset telephone style handset or push to talk mic The KB 111A provides an adjustable Sidetone circuit which allows you to vary the level of your voice as you hear it in your headset or speaker The circuit also prevents feedback when using the speaker and a simultaneously You need only adjust the sidetone once even if other Stations subsequently join or leave the intercom system Designed for custom mounting the 111 built on a 1 brown aluminum panel 5 32 thick that can be installed a cut out in any convenient surface or moun ted inside 6 x 8 electri cal enclosure The Station connects to the intercom system via a 5 pin terminal block behind the front panel Clear Com offers the P Box which allows you to convert the 111 to a portable Remote Station The P Box a sturdy sloped front steel enclosure with solid walnut sides When installed in a P Box the 111 connects to the inter com system with 3 pin XLR connec tors When the 111 is installed the P Box provides ta
12. up for remote control The amber Call Lamp illuminates when any Station on the same chan nel activates a Call signal If you need to receive a Call sig nal from the channel you re not using refer to the special modifi cation diagram on page 9 KB 111A FRONT PANEL PARTS LISTING Part Description Qty Schematic Reference 210013 Connector D4M l J2 210050 Connector 1 4 phone jack 1 31 240015 Knob 1 2 with 1 8 shaft 1 240020 Button cover red l 51 510028 switch snap action 250144 Panel front KB 111A 1 280067 Nut dress cone 2 Call Channel Select 280071 Nut 1 4 dress 2 Speaker and Mic On Off 390000 Lamp cover amber 1 11 390001 bulb 387 500089 Speaker 3 round 1 5 1 _ 510006 Switch mini toggle 1 Speaker On Off 510040 Switch mini toggle 1 Channel Select 510044 Switch 3 position 1 Mic On Off On KB 111A SPECIFICATIONS AMPLIFIER DESIGN Solid state integrated circuit amplifiers which include a mic preamp headset speaker power amp and signalling circuitry Current limited with short circuit e and reverse polarity protection MIC PREAMPLIFIER Freq Response 250 12k Hz with mic limiter contoured to enhance intelligibility Mic Input 200 ohms Mic Preamp Gain 33 dB Max Input Before Clipping 20 dB Mic Limiter Threshold 37 dBm HEADSET SPEAKER AMPLIFIER Freq Response 100 18k Hz 2 dB Load Impedance Range 8 2000 ohms d
13. ynamic headset 20 dBm 26v p p 100 ohms Headset Level gt 110 dB SPL with standard ClearCom headset Speaker Level gt 98 dB SPL 3 feet Speaker Type 3 round 16 ohms Power Output 4 watts peak Distortion 0 5 THD 0 2 Output Level Headphone Amp Gain 40 dB GENERAL SPECIFICATIONS Line Level 20 dB avg 0 dB Sidetone Adj 3548 null to full on Signal Voltage 11VDC on audio line Call Light Sensitivity 4 volts Signal to Noise 75 dB Equivalent Input No se 118 dB Station Bridging Impedance 12k ohms 200 10 Hz Voltage Range 12 32 volts 28v nominal Power Required 25 ma quiescent 60 ma talk 60 ma signalling 200 ma short circuit Dimensions front panel 8 6 x 6 5 x 3 25 deep CONNECTORS Dynamic Headset Male D4M Carbon Headset 1 4 phone jack Line 5 screw terminal block portable unit 1 Male D3M 1 Female D3F Special Modification Signalling Configuration in Multi Channel Systems In normal circumstances the i e 111 have selected Chan 111A Call Light illuminates when nel B for communication Yet they Someone signals on the channel that want to be capable of receiving a the operator has selected Call signal from stations that are for communication This is because communicating on Channel A the visual signal travels in the form of DC voltage that chan This is achieved by putting four nel s line diodes 914 type in s
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