RM-120A Speaker Station INSTRUCTION and SERVICE MANUAL I|1 JI IIClearm orm Intercom Systems 945 Camelia St. Berkeley, California 94710 510-527-6666 Clear-Com 810031 8/15/88 REV.
CLEAR-CON RM-120A SPEAKER STATION OPERATION MANUAL TABLE OF CONTENTS Section Page # I II III IV Introduction to the RM-120A .................. Headsets and Mics ........... Installation ........... operating Controls & Connector:3 ........... V VI Specifications ........... Parts Listing ........... Illustrations Headset Extension Cord. RM-120A Rear Panel. Daisy-Chain Interconnection. RM-120A Front Panel. RM-120A Schematics.
DOCUMENTATION ADDENDUM RM-120A 4* * MANUAL REV.A 17, 1987 *4 at sNovember 44 * 4* *it * 4 4* 4* 4tW*44 4 *t *J * 4 41.4$sst 14 *J ****$**i* 4 * . 44X 4 * * $*s** MIC TO LINE GAIN LEVEL INCREASE In effecting a 4dB Mic to Line increase in gain level, the following changes have been made: Change: At: 100K OHM R50, 1.5K OHM R2 3 To: R51 220K OHM 2.
I. INTRODUCTION TO THE RM-120A SPEAKER STATION The RM-120A is a remote speaker station that allows selectable communicating in the Clear-Com System. The operator can talk and listen on Channel A, Channel B, or both at once (without tying them together). The RM-120A mounts in a 19" rack, using just 1.75" vertical space. It features a wide frequency response speaker and operates with a carbon headset or a dynamic headset/telephone-style handset.
II. HEADSETS AND MICS To assure proper level and performance, the dynamic headset should have the following characteristics: 150-250 ohms mic Impedance: -55 dBv Nominal Output Level: dynamic Headphone Type: 300-2000 ohms Impedance: The RM-120A provides: --one 1/4" phone jack for a standard carbon headset, AND --one 4-pin, male, XLR connector for dynamic headset, telephone handset, or push-to-talk mic.
III. RN-120A INSTALLATION 0 The RM-120A connects to the intercom system via two pairs of 3-pin, XLR connectors on the rear panel. 1) Route each channel on a separate, two-conductor, shielded mic cable (e.g. Belden 8413) from the Main Station intercom output connectors to the rack location of the RM-120A. 2) Rack-mount the RM-120A and then apply the intercom inputs to the appropriately labelled (Channel A or Channel B) 3-pin female connectors (on the rear panel).
IV. Rm-120A OPERATING CONTROLS & CONNECTORS The RM-120A controls and connectors are described below in the order in which they appear on the FRONT PANEL from LEFT to RIGHT. Fo r © ¾ ~~~~~~~~~~RM.120A =© 0 000-° 1, ;44' 2i == -f]H O Jp 1900 -48260) Call The Call com user headsets trol the push-button activates visual signalling. It allows the interto attract the attention of operators who've removed their or turned off their speakers.
At the factory, Clear-Com sets the internal sidetone null to the best overall null with 500 feet of cable. If the sidetone is not nulled enough, feedback may occur between the speaker and the mic. To adjust the internal sidetone null: 1) 2) 3) 4) remove top cover of unit plug in headset and turn on mic (or activate gooseneck mic) turn up Headset Volume talk into mic while slowly turning sidetone adjustment clockwise. Find the null point where you can barely hear yourself.
V. RN-120A SPECIFICATIONS AMPLIFIER DESIGN Solid-state, integrated circuit amplifiers which include a mic pre-amp with limiter, headset power amp, speaker power amp, and signalling circuitry. Current-limited with short-circuit and reverse polarity protection. MIC PRE-AMPLIFIER 250-12k Hz, with Freq.
VI. RK-120A PARTS LISTING Part # 210002 210003 210013 210050 210055 240015 240017 250128 250224 250073 250152 250163 390013 500095 510012 640028 710054 710158 810031 8 Description Conn, intercom/prgm, D3F Conn, intercom, D3M Conn., headset, D4M Conn., 1/4" phone jack Conn., 1/4" jack w/switch Knob, black, 1/2" Handle, chrome RM+-120A rear panel RM-120A front panel Chassis mainframe, 1.
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