Clear-Com MS-440 4 Channel Main Station

The MS-440 Intercom station is a 4-channel microprocessor controlled station intended to work with other Clear-Com Party-Line products. This station has a speaker, provisions for installing a panel microphone, and a headset connector. The MS-440 is a 4 channel Main station that contains a 2 amp. no fail system power supply.\n\nFeatures:\nMICROPROCESSOR CONTROL: Most aspects of station operation are under microprocessor control.\nREMOVABLE ACCESS PANEL: A removable access panel allows access to most controls and option dip switches.\nREMOVABLE RACK MOUNTING BRACKETS: Removable rack mounting brackets allows the units to be rack mounted or used 'stand-alone' as a table top unit.\nINDIVIDUAL CHANNEL CONTROLS: Each channel has individual Talk, Listen, and Call push-buttons for each channel.\nMOMENTARY/LATCHING TALK BUTTONS: The TALK buttons have a momentary and latching action depending on how the button is used. The latching function can be defeated with dip switches.\nINDIVIDUAL CHANNEL ADJUSTMENTS: Each channel has individual listen level controls, channel null adjustments, and program feed level controls.\nMULTIPLE PROGRAM INPUTS: Multiple program inputs are provided for local station monitoring and program feed to intercom lines for local talent cueing (IFB).\nINTERNAL IFB (IFB - Interrupt Foldback of program feeds): Program can be fed to each channel and interrupted (IFB) when a Talk function is active or when a Call signal is received on that channel. An internal jumper determines whether the IFB function is Talk or Call signal activated.\nLINK FUNCTION (MS-440): The MS-440 has a LINK function that places all channels into a common party-line at the single push of a button.\nALL-TALK: An ALL-TALK button allows instant access to all channels.\nANNOUNCE FUNCTION: An ANNOUNCE button allows external paging. A set of relay contacts is provided to control an external system.\nPROGRAM FEED OVER STAGE ANNOUNCE: An internal jumper allows the main program feed to be fed to the Stage Announce output. The program is automatically interrupted when the ANNOUNCE button is pressed.\nMIC ON/OFF SWITCH: A separate MIC ON/OFF push-button allows turning the microphone off without upsetting the setting of TALK switches.\nEXTERNAL MIC ON/OFF INPUT: An external logic input allows the MIC ON/OFF function to be switched remotely.\nEXTERNAL IFB and HOT MIC OUTPUT: A rear panel jack provides direct connection to Clear-Com's external IFB system such that the station's microphone can be used in the external IFB system.\nA buffered unswitched output of the selected microphone is also available.\nSPEAKER ON/OFF SWITCH: The speaker may be turned on and off with a front panel switch.\nSPEAKER MUTING: Whenever a TALK is active the Speaker output is muted approximately 6 dB to prevent feedback.\nPANEL MIC GAIN: The preamplifier for the Panel microphone has a gain trim adjustment to allow field trimming. Adjustment of the panel microphone gain also varies the frequency response of the preamplifier to compensate for feedback when the microphone is used up close.\n2 AMP. POWER SUPPLY WITH SHORT CIRCUIT PROTECTION: The SB-440 features redundant powering to remote stations by providing separate short circuit protected power sources to each of the four intercom lines.\nA short on one intercom line will not bring the whole system down. Short circuit indicators are provided on the front panel for each channel.\nSpecifications:\nCONTROL SYSTEM: Microprocessor controlled logic and CMOS electronic switches.\nHEADSET MICROPHONE PRE-AMP:\nDynamic Headset Input Impedance: - 200 Ohms\nInput Level: - 55 dBv* nominal\nFrequency Response: 150 Hz to 15 KHz, contoured for intelligibility.\nGain from Headset to Intercom Line: +41 dB\nPANEL MICROPHONE PRE-AMP:\nInput Level: 45 dBv* nominal\nFrequency Response: 150 Hz to 15 KHz, contoured for intelligibility.\nGain from Panel Mic to Intercom Line: +31 dB (adjustable)\nSPEAKER AMPLIFIER:\nLoad Impedance: 8 - 50 Ohms\nOutput Level: 4 watts into 8 Ohms\nDistortion: <0.5% THD at 1 KHz\nFrequency Response: 200-15KHz + /-2dB\nHEADPHONE AMPLIFIER:\nLoad Impedance: 50 - 2000 Ohms\nOutput Level: at least +20 dBv* across 600 Ohms\nDistortion: <0.2% THD at 1 KHz\nFrequency Response: 150-18KHz +/-2dB\nGain from Intercom Line: +37 dB\nPROGRAM INPUT:\nInput Level Ref.: 0 dBv*\nInput Impedance: >10 KOhms\nFrequency Response: 150 Hz to 15 KHz\nINTERCOM LINE DRIVE/RECEIVE CIRCUITS:\nImpedance, Bridging: >10 KOhms\nLevel, Line (200 ohm load): -14 dBv* (nominal) +5dBv (max before clip)\nSidetone Null Capability: >25 dB (200Hz - 10 KHz)\nCrosstalk, Station Induced Ch. to Ch.: >60 dB\nNoise, S/N Ratio in Listen Channels: >60 dB\nLINE LEVEL OUTPUTS:\nSA (Announce)\nType: Balanced\nImpedance: 600 ohms\nLevel: 0 dBv\nIFB/Hot Mic:\nType: Unbalanced\nImpedance: 600 Ohms\nLevel: 0 dBv\nSTANDARD CLEAR-COM SYSTEM SPECIFICATIONS:\nUsable Line Quality: > 100 Stations\nTotal Line Length on One Channel: > 5000 feet\nCONNECTORS:\nIntercom: (MS-440): 8 XLR-3M\nIntercom: (RM-440): 4 XLR-3M and 4 XLR-3F\nAnnounce Output: XLR-3M\nProgram Input (Main): XLR-3F\nAccessory: DB-15F\nAuxiliary Program Inputs (4)\nFoot Switch Logic Input\nLine Level Output (Sig n al being sent to speaker amp.)\nAnnounce Relay Output\nIFB/HotMic: 1/4inch Phone Jack\nPOWER REQUIREMENTS and OUTPUT:\nMS-440 Source: AC Power Line\nVoltage: 90 - 240 V AC 50-60 Hz\nPower In: 80 VA Max.\n30 VDC Intercom Power Out: 2.0 Amp Continuous short circuit protected, 1 3/4 Amp. each channel\nRM-440 Source: Intercom Line\nVoltage: 20 - 30 VDC\nCurrent: 90 mA idle, 150 mA average\nPHYSICAL SPECIFICATIONS:\nDimensions: 19"W x 3.5"H x 10.S"D (483mm x 88mm x 267mm)\nWeight (MS-440): 7.4 lbs. (3.4 Kg)\nWeight (RM-440): 5.9 lbs. (2.7 Kg)\nOperating Temperature Range: 32-122° F (0-50° C)