Remote Speaker Stations
KB-212
FEATURES
• Single-channel, push-to-
talk speaker station
• Four different modes of
operation, internally
programmable
• Microprocessor-
controlled logic and
switching
• Flush-mounted internal
microphone
• Visual and audible call
signaling, with bright
LED indicator
• Balanced local program
input with separate level
control
• Optional TW and 4-Wire
daughter boards provide
additional flexibility
• Wall or console mount,
or optional V-Box for
portable or desktop use
DESCRIPTION
The KB-212 remote speaker station connects to a single channel of party-line intercom,
and operates in half-duplex mode, similar to a walkie-talkie. It features both an integral
speaker and a flush-mount electret microphone with mic limiter and a push-to-talk button.
The station may be programmed via two internal dip switches to operate in four different
modes, activated by other stations within the intercom system.
The different operating modes are activated using the call signaling function of another
station, which allows for individual control of the speaker and microphone. The default
mode is speaker on/mic off, with push-to-talk active on the front panel. In the remote page
mode, the mic is activated locally and the speaker is off except when turned on by another
station. For remote push-to-talk, the speaker is on and mic is off, unless it is turned on by
another station. And in the talk-back remote page mode, the mic is normally on for hands-
free talking and the speaker is off; another station can turn off the microphone and turn on
the speaker for paging to the KB-212.
Microprocessor-controlled logic and switching yields a feature-rich intercom station in a
compact format. An electronic momentary-only talk button activates the talk function.
A green LED indicator lights whenever the mic is activated, either by the talk button or by
remote control from another station. Mic sensitivity is selectable for either close or distant
voice pickup.
The KB-212 offers both visual and audible call signaling, gaining the attention of the
user when not at the station. A bright yellow LED lights when a call is activated on a con-
nected 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 pag-
ing interrupt. This would allow paging at the station even if the intercom volume control is
turned down. In addition, the intercom volume control of the KB-212 can be internally set
so that an incoming message would still be audible, even if the control was turned all the
way down.
The KB-212 may be wall or console mounted in a standard 4-gang electrical box, or
may be mounted in the optional V-Box for desktop, surface-mount, or portable applica-
tions. It may be used with the optional 4-wire or TW (two channels on a single mic cable)
daughter boards. The station is powered by the intercom line or by a local power supply
when used with the optional 4-wire daughter board.
KB-212
Single-Channel
Speaker
Station
(53 strony)
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