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Method 2:
Jumper Settings

The

Notch Filters are adjusted by moving the Configuration Jumpers so the Audio from

the microphone temporarily appears at the Speaker in the same room, to induce
feedback.

REMOTE

TO

OPERATOR

OPERATOR

TO

REMOTE

Also Jumper
Remote Speaker
Always On

Also Jumper
Operator Speaker
Always On

Temporary Jumper Setting for Notch Filter Setup

There are two distinct primary resonance modes in most installations. One is room resonance;
usually one mode is most prevalent, such as floor to ceiling resonance. This frequency is
usually on the order of a few hundred cycles. The second mode is the distance of the
microphone from a near object. This frequency is much higher near 1000Hz. The IC-52B
incorporates two filters in tandem, one a low Band Filter 250Hz to 1000Hz, and the other a High
band Filter 750Hz to 3000Hz.Adjust the Notch Filters one at a time. Increase the Speaker Level
Control until feedback occurs.

Make a rough determination of the frequency (or measure the frequency with a counter).
If the feedback is below ~800Hz, adjust the ‘Lo Notch’ until feedback ceases. If the feedback is
above ~800Hz, adjust the ‘Hi Notch’ until feedback ceases. This is a 20-turn pot so it is best to
start from one extreme, and slowly turn the pot in the other direction

Increase the Speaker Level Control until feedback occurs again, if it is at the same frequency;
try finely adjusting the same filter to see if the feedback can be eliminated. If the frequency is
different, and in the other range not already tuned, repeat the steps above

If only one Notch Filter is required, the other filter should be set at the extreme of its range.
Fully CCW (lowest frequency) for the LO filter, and fully CW (highest frequency) for the HI filter.

After the Notch Filters are adjusted, move the Jumpers to their correct position and redo the
initial adjustments.

Note:
Before making any adjustments assure there are audio Inputs and Outputs

All the associated indicators must be lighted green

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Содержание IC-52B

Страница 1: ... United Communication Technology Inc 22347 La Palma Ave Suite 107 Yorba Linda CA 92887 Direct Line 714 694 1040 Fax 714 694 1041 Toll Free 1 800 813 1080 Web site www tech4people com 2 15 IC 52B DUAL CHANNEL AUDIO INTERCOM AMPLIFIER OPERATION AND INSTALLATION MANUAL ...

Страница 2: ... their own engineering then all sections may be useful You may also wish to contact a Tech Works application engineer for assistance Table of Contents Table of Contents List of Illustrations Overview Specifications Functional Diagram and Explanation Mechanical Details Front Panel controls and Indicators Rear Panel Connections Main Board Jumper Options Setup Adjustments Application Templates Mounti...

Страница 3: ...et Drive Through Window VOX application Cath Lab Application with Doctor Music Interview Application with Conversation Logging IC 52B DM Desk Mount IC 52B WM Single Wall Mount IC 52B WM2 Dual Wall Mount IC 52B RM Rack Mount IC 52B RM2 Rack Mount Accessories Page 5 Page 8 Page 9 Page 10 Page 12 Page 13 Page 21 Page 22 Page 23 Page 24 Page 25 Page 25 Page 25 Page 25 Page 25 Page 26 ...

Страница 4: ...imized frequency range to compensate for poor room acoustics The other has a higher frequency range to reduce microphone to wall glass resonance In every way the IC 52B is the Universal Audio Intercom Amplifier Solution The logic interface has a plethora of Inputs and Outputs However standard functions require few wires The Indicators are comprehensive yet a simple The interface is fully configura...

Страница 5: ... can be enabled by moving jumpers to the Remote or Operator Channel Notch filters must be set up in the field The Logic Control section provides the interface of the control contact inputs as well as the audio control for muting audio signals depending on how the unit is configured If it is configured for full duplex then only muting is enabled If the Call In feature is active the logic controls t...

Страница 6: ...0dBm Selectable minimum input Balanced for full rated output Selectable Equalization 3 settings optimized for voice communication Selectable Phantom Power 22 Volts Short Circuit Protected Configured for a Line Level Input 2000 Ohms Balanced 1000 Ohms Unbalanced Balanced input 35dBm to 5dB or 20dBm to 20dB Accommodation range Un Balanced Input 30dBm to 10dB or 10dBm to 20dB Accommodation range Spea...

Страница 7: ...perator and Remote Greater then 40dB Automatic Level accommodation Fast Attack 10mS Feed Forward Control no Pumping Independently adjustable Microphone Gain Notch Filters Selectable Channel Operator Remote Not used Notch Depth 10dB Two tandem frequency ranges 250 1000Hz 750 3000Hz Voice Activation VOX VOX setup indicator Electronic Switching 3mS Silent Switching no Pops Adjustable Recovery Delay C...

Страница 8: ...l 1U Half Rack 8 X 1 X 6 Mounting Options Table Top Under Counter Rack Approximately 3 lbs Modular aluminum enclosure Euro Style connectorized barrier strips SIDE VIEW FRONT VIEW WALL MOUNT TOP DUAL WALL MOUNT TOP RACK MOUNT TOP DESK MOUNT TOP ...

Страница 9: ... Reach Level Indicator Remote Microphone Level Off Microphone Off Green low input level Green flashing to Red Normal Operation Speaker Level Control trimpot sets the listening level from the Operator Speaker Voice Activation VOX Sensitivity trimpot when fully CCW VOX is disabled VOX Setup Indicator Green when Operator is listening or muted Red when Operator is talking See setup instructions Anti V...

Страница 10: ...EM MIC REM SPKR COMMON REM SPKR PTT SW VOX INHIBIT CALL SW REM ACTIVE COMMON OP ACTIVE CALL PA PA REM REM IC 52B Rear View Audio I O Euro Style Barrier Strip Operator Microphone Line Input Configurable see Specifications and Jumper Options Operator Speaker Output Remote Microphone Line Input Configurable see Specifications and Jumper Options Remote Speaker Output Page Output Line Level Output afte...

Страница 11: ...Tone Jumper Option Activates the Intercom if Inactive VOX Inhibit Active low sustained Defeats VOX while depressed Provides privacy to the Operator microphone when using VOX Call Active low momentary Causes Call Tone to be sent to the Inside speaker Causes Call Light to flash Indicator Outputs Euro Style Barrier Strip Open Collector Transistors Common sensing for Indicators or PLC V 30Volts I 200M...

Страница 12: ...2 15 Page 12 of 26 Simplified Block Diagram ...

Страница 13: ...mper Locations Control Functions Jumpers Change Tone Shutoff The Call Tone is edge triggered by a Switch Closure The Call Tone is Cancelled by the a PTT Switch Closure The Call Tone may run a single cycle and Stop ONE CYCLE Or Run continuously until the PTT switch is pressed CONTINUOUS Change Over Delay These Jumpers control the switching time from the Remote Speaker being active to the Remote Mic...

Страница 14: ...oseneck and Hanging microphones Only MED CUT Jumper Upper Position Medium frequency Roll off Used with most flush mounted microphones Only HI CUT Jumper Upper Position Highest frequency Roll off Used with most Speakers used as a microphone Both Jumpers Lower Position Line Input 170Hz Roll off Sensitivity reduced to 35Bm for full Output Note For a Balanced Line Level Input the LO Gain Position is a...

Страница 15: ...alking The Remote Microphone is OFF The Operator Microphone is ON The Operator Speaker is OFF The Remote Speaker is ON However the control of the Microphones and Speakers are controlled by Jumpers Any of these sections may always be ON These always selections are useful in implementing in implementing Always Listening Push to Talk Full Duplex Operation Always Monitoring to the PA BUSS Output Etc O...

Страница 16: ...re summed Remote Microphone ON OFF Operator Microphone ON OFF Call Tone ON OFF When to send The PA BUSS Output ALERT Signal Keying Signal is selectable logical OR ed Remote Microphone ON OFF Operator Microphone ON OFF Call Tone Running ON OFF The PA BUSS Audio Distribution Buss has four signal pairs Buss Power Option Current Limited 23 Volts Program Audio Option Background Audio or Music Page Comm...

Страница 17: ... Reach Microphone Gain from 0 until the Talk Level indicator just flashes red If this setting is below 2 move the Gain Range Jumper to the LOW Position Advance the Reach Microphone Gain no more than two clicks 6dB into limiting If the Notch Filters are going to be used move the Jumpers to the appropriate channel and do those adjustments next Then you will need to redo the adjustment above of the e...

Страница 18: ...l expected input level at the Remote microphone Turn both the VOX and Anti VOX pots fully counterclockwise Turn the Operator Speaker Level control fully Counter Counterclockwise so that there is no sound coming from the Operator s speaker Speak at a normal level and distance into the Operator microphone while advancing the VOX trimpot clockwise until the VOX indicator flashes red and the direction...

Страница 19: ...rophone from a near object This frequency is much higher near 1000Hz The IC 52B incorporates two filters in tandem one a low Band Filter 250Hz to 1000Hz and the other a High band Filter 750Hz to 3000Hz Adjust the Notch Filters one at a time Increase the Speaker Level Control until feedback occurs Make a rough determination of the frequency or measure the frequency with a counter If the feedback is...

Страница 20: ...ease the Speaker Level Control until feedback occurs Make a rough determination of the frequency or measure the frequency with a counter If the feedback is below 800Hz adjust the Lo Notch until feedback ceases If the feedback is above 800Hz adjust the Hi Notch until feedback ceases This is a 20 turn pot so it is best to start from one extreme and slowly turn the pot in the other direction Increase...

Страница 21: ...LL VOICE SPEAKER 25 VOLT MICROPHONE VOICE SPEAKER 25 VOLT MICROPHONE VOX INHIBIT CALL TALK OPERATOR MIC ACTIVE ACTIVATE REMOTE MIC ACTIVE SHUT OFF REMOTE MIC ON OP MIC ON 2K 2K 2K Default Jumper Settings SWITCHED ALWAYS SWITCHED ALWAYS 10 mS 200 mS CONTINUOUS ONE CYCLE SWITCHED ALWAYS HI CUT MED CUT OP EQ HI CUT MED CUT REM EQ P16 P17 P18 P19 P20 P21 P12 P13 P6 P11 P5 P15 P14 P7 P10 P1 P4 Setup Th...

Страница 22: ...CTIVE SHUT OFF REMOTE MIC ON OP MIC ON 2K 2K 2K The typical Drive Through or Ticket Window Intercom configuration does not use a separate outside or Remote microphone Simply jumper the REM MIC to the REM SPKR and the REM MIC to the REM SPKR and the standard 25 volt speaker becomes a weather and vandal resistant microphone SWITCHED ALWAYS SWITCHED ALWAYS 10 mS 200 mS CONTINUOUS ONE CYCLE SWITCHED A...

Страница 23: ...pical medical Procedure Room Intercom configuration uses the special features specifically designed into the IC 52B such as Operator Listen Always On and Procedure Room Music Mute Tech Works microphones include indicator lamps to tell the Operator when the intercom is in the Listen mode or when the Microphone is active for both Talk and Listen SWITCHED ALWAYS SWITCHED ALWAYS 10 mS 200 mS CONTINUOU...

Страница 24: ...former isolated recording outputs with automatic level control for line level audio to any professional recording equipment The typical Interview Room configuration uses the features such as Selective Recording of what was said or what was heard depending on Jumper settings SWITCHED ALWAYS SWITCHED ALWAYS 10 mS 200 mS CONTINUOUS ONE CYCLE SWITCHED ALWAYS HI CUT MED CUT OP EQ HI CUT MED CUT REM EQ ...

Страница 25: ...AND PAGING AMPLIFIER POWER PA 402 LEVEL ACTIVE LEVEL PROGRAM IC 52 WM2 Shown with an IC 52B and a companion PA 402 IC 52 RM Rack Mount Option IC 52 RM PAGE ACTIVE PROGRAM AND PAGING AMPLIFIER POWER PA 402 LEVEL ACTIVE LEVEL PROGRAM IC 52 RM2 Shown with an IC 52B and a companion PA 402 mounted in a single rack space ...

Страница 26: ...1 PLUS which includes a 15 foot cable with connectors and wall plate Both offer a variety of hands free call in and control options System 21 i is s a a c co om mp pl le et te e c co os st t e ef ff fe ec ct ti iv ve e a as ss se em mb bl ly y t th ha at t i in nc cl lu ud de es s a a h hi ig gh h q qu ua al li it ty y 8 8 l lo ou ud ds sp pe ea ak ke er r 2 25 5V V t tr ra an ns sf fo or rm me er...

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