CP-300 & TW-12 Belt-Pack & Interface Two-Wire System INSTRUCTION and SERVICE MANUAL CA) ClearCor®e Intercom systems 1111 17th Street * San Francisco, California 94107 * 415-861-6666 CLEAR-COM 810044 TW/10-84 REV B
CLEAR-COM CP-300 BELTPACK STATION & TW-12 TWO-WIRE INTERFACE UNIT OPERATION & SERVICE MANUAL Contents Page # Introduction to the Belt-Pack & Interface...I System Installation .......................... 3 Headsets Interconnect Cable CP-300 in a Single-Channel System CP-300 in a Two-Channel System TW-12 Set-Up Loop-Through Interconnection 6 CP-300 Operating Controls .......... 7 Parts Listings .......... 8 Specifications .......... Illustrations Figure 1: System Interconnection ...........
CLEAR-CON CP-300 BELT-PACK Operation & Service Manual ADDENDA CP-300 "Call" Signalling (replaces "Optional Signalling" section of Introduction to the Belt-Pack; page 1, column 2) The signalling option for the CP-300 provides a visual alert for users who aren't listening to the intercom. Pressing the CP300's CALL button sends a special call-signalling voltage (either a 20 kHz tone or a positive DC voltage) onto the intercom channel currently in use.
CLEAR-COM CP-300 BELT-PACK STATION & TW-12 INTERFACE UNIT OPERATION MANUAL . 1. INTRODUCTION TO THE BELT-PACK & INTERFACE The Clear-Com CP-300 is a portable belt-pack intercom that allows communication on two channels, using standard two-conductor microphone cable. The CP-300 is different from other Clear-Com Stations because it requires connection to an interface unit, Model TW-12, to utilize its full capabilities.
CP-300 and TW-12 Description, continued The belt-pack provides a sidetone adjustment, which allows the user to vary the level of his/her voice (full on to 25 dB null) as heard in the headset. This control need be set just once, if at all, even if other intercom stations join or leave the intercom network. TW-12 The TW-12 Interface connects between the CP-300 Belt-Pack(s) and a standard Clear-Com Power Supply or Its function is to Main Station.
II. SYSTEM INSTALLATION Headsets The CP-300's dynamic headset input is a 4-pin, male XLR. To insure proper level and performance, the dynamic headset (or handset) should have the following characteristics-Mic Impedance: 150-250 ohms Mic Output Level: -55 dB Ear Element Impedance: 50-2000 ohms The dynamic headset connector pin-out is: Pin 1: mic common Pin 2: mic hot Pin 3: headphone common Pin 4: headphone hot NOTE: Do NOT connect headphone ground and mic ground together at any point.
SYSTEM INSTALLATION, continued The CP-300 as a Single-Channel Station First be sure that the recessed two-position switch on the belt-pack's side is set to the "SINGLE CH MODE (select B)" position (see Figure 1 for location of mode-select switch). Second, the CP-300 operator must communicate on Channel B when using the single-channel mode; be sure that the CP-300 Channel-Select switch is set to the "B8"position.
SYSTEM INSTALLATION, continued TW-12 Set-Up The TW-12 provides two male and two female 3-pin, XLR connedtors for input and extension of Clear-Com channels A and B, plus a third set of XLR connectors for use with the twochannel/two-wire end of the system. For all connections, use standard two-conductor shielded mic cable. See Figure 3.
111. CP-300 OPERATING CONTROLS The MIC SWITCH turns the headset mic ON and OFF, and includes a third position marked "on (mom)" (momentary on) for quick messages. The CHANNEL-SELECT SWITCH allows: 1) communication on Channel A or on Channel B, when the CP-300 uses the 2-Channel mode, OR 2) communication on one channel (3) when the CP-300 uses the SingleChannel mode. Note that the Channel-Select Switch must be set to "B" when the CP-300 standard operator is using the Clear-Corn single-channel mode.
IV. PARTS LISTING CP-300 Belt-Pack Without Signal Option part # 150048 210002 210003 210013 210050 240031 250041 250233 250234 640007 710152 description qty.
V. CP-300 SPECIFICATIONS AMPLIFIER DESIGN: Solid-state, low-noise I.C. amps; current-limited and shortcircuit-protected, with reverse polarity protection. MICROPHONE PRE-AMPLIFIER 1k ohm Mic Input Impedance: 50 dB Mic Pre-amp Gain: -32 dB Max Input Before Clipping: 250-12k Hz, *5dB Freq.
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