Clear-Com KB-702 Two Channel Remote Speaker Station

The KB-702 remote speaker station permits the user to select between two channels of party-line communications, with the ability to talk and/or listen on the selected channel. The user can listen via the integral speaker, or may use a headset or telephone-style handset - and can talk via a headset mic, a telephone handset, or a push-to-talk microphone.

Features

Selectable two-channel, full-duplex operation
Microprocessor-controlled logic and switching
Momentary/latching talk button
Visual and audible call signaling, with bright LED indicator
Balanced local program input with separate level control
Internal controls for call signal tracking, mic latch disable, and other functions
Use with headset or handset, with integral speaker for monitoring
Optional TW and 4-wire daughter boards provided additional flexibility
Wall or console mount, or optional V-Box for portable or desktop use
LED buttons for talk, listen, call, announce, link, all talk, or mic on

Headset Microphone Input	nput Type: Dynamic Input Impedance: >= 1Kohm Mic Limiter Threshold: -2dBu ± 3dB Mic Limiter Range: >= 15dB
Program Line Input	Maximum Level before Clipping: >= 20dBu Input Impedance: >= 5K ohms
Headset Output	Load Impedance: >= 8 ohms Output Impedance: <= 25 ohms Output Limiter Threshold: +5dBu ± 3dB Maximum Output Level before Distortion: >= 17dBu
Speaker Output	Load Impedance: >= 4 ohms Max Output Level before 1% Distortion: 20dBu ± 2dBu
Party Line Output	Off Noise: < -74dBu Output Impedance: >10K ohms
Party Line Input	Crosstalk: < -60dB Max level before Clipping : >= 12dBu
Frequency Response	Headset Mic - Party Line: 300 - 15KHz ± 3dB Program Input - Headset Out: 200 - 18KHz ± 3dB Program Input - Speaker Out: 200 - 18KHz ± 3dB Party Line - Headset Out: 200 - 18KHz ± 3dB Party Line - Speaker Out: 200 - 18KHz ± 3dB
Max Distortion	Headset Mic - Party Line: <= 0.5% Program Input - Headset Out: <= 0.2% Program Input - Speaker Out: <= 0.5% Party Line - Headset Out: <= 0.2% Party Line - Speaker Out: <= 0.5%
Noise	Headset Mic - Party Line: < -70dBu Program Input - Headset Out: < -60dBu Program Input - Speaker Out: < -60dBu Party Line - Headset Out: < -50dBu Party Line - Speaker Out: < -50dBu
Max Gain	Headset Mic - Party Line: 41dB ± 2dB Program Input - Headset Out: >= 18dB Program Input - Speaker Out: >= 24dB Party Line - Headset Out: >= 34dB Party Line - Speaker Out: >= 40dB
Power	Input Voltage Range: 20-30 VDC Input Current (Idle): <= 90mA Input Current (Max): <=110mA
Internal Adjustments and Connections	Intercom: Line Five terminal connector Program Input Three terminal connector Option Switches: Three DIP switches Call Signal Jumper3: Three sets of options jumpers Call Alert Tone Level Control: Level adjustment control
Front Panel Connectors	Headset: (1) XLR-4M
Front Panel Controls & Indicators	(1) Program monitor level control (1) Sidetone null control (1) Talk button (1) Call button (1) Speaker ON-OFF switch (1) Channel select switch (1) Speaker volume control
Environmental	32 - 122°F
Dimensions (W x H x D)	8.25" x 4.5" x 1.75"
Weight	0.99 lbs

Microprocessor-controlled logic and switching yields a feature-rich intercom station in a compact format. Electronic switching for the talk button, blue-color LED (on), amber color LED (off), permits momentary or latching operation. For call signaling, a bright LED lights when a call is activated on a connected intercom channel. A defeatable audible call signal, with level control, is also provided. Separate level controls are provided for intercom level and for balanced program input. A local program source may be fed to the station, allowing the user to monitor that source while remaining in contact on the intercom system. The balanced program input can also be used in conjunction with the stage-announce output of a main station to provide a paging interrupt, allowing paging at the KB station even if the intercom volume control is turned down.

A set of option dip switches is located at the top of the circuit board. Swithces are provided for mic-latch disable (momentary-only talk), long-line operation, channel selection, call signal tracking, and audible call signaling.

These versatile stations may be wall or console mounted in a standard U.S. 4-gang electrical box, or may be mounted in the optional V-Box for desktop, surface-mount or portable applications.

Either of the stations may be used with the optional 4-wire or TW (two channels on a single mic cable) daughter boards. On the TW board, the stations become plug in compatible with a Clear Com TW system. The 4-wire board creates separate send and receive circuits, so that the station may be attached to fiber-optic lines or other audio routing systems with 4-wire connections. The stations are powered by the intercom line or by a local power supply when used with the optional 4-wire daughter board

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