10/29/2019
Tech Works CI-Series Systems Planning & Installation Manual Page
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of
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Tech Works Products have “Line Level” Inputs and Outputs, 0dBm (.775 Volts, RMS).
The Maximum Out
put of a "Source" is 0dBm, with the “LEVEL” Control set at maximum
(Fully CW).
For Tech Works Amplifiers, a 0dBM input corresponds to a Maximum rated Output.
Therefore with all the “LEVEL” controls at Maximum the full rated output is achieved.
However this setting is never used; there should always be some attenuation in the system.
Normally if there are two level controls in tandem, only one is used to set the level, the other is
set to maximum (Fully Clockwise).
When an Amplified Speaker is used, the Source PA-BUSS output Level Control is used.
When the PA-BUSS is used with an Amplifier (PA-402), the Amplifier Level Control is used.
In special circumstances with multiple amplifiers, there may
be a desire for a “Master” Level
Control, with the Individual Amplifier Controls used for Balancing the System.
The Alert Pair is a "Party Line" passing through to all the Units forming an Amplifier Chain.
The PA-BUSS Source is the "Initiator" of the Alert,
other units may take appropriate action
.
Responder Units are electrically isolated, with Opto-couplers.
The ALERT signal requests the Amplifier or Logging Device to take action.
For
example,
the
amplifier
switches
from
Background
Music
(Program),
to
Paging/Communication.
Tech Works BUSS products are designed to be configured for the application; functional sections
are connected with jumpers.
The multitude of configuration possibilities allows a few products to be configured for a myriad of
application possibilities!
This design is very flexible; each system is customized for the application!
If amplifiers are in a chain, configuration
switches
allow different amplifiers to respond as required.
Some Units may ignore the request.
Monitoring maybe selective:
The, Source, /PA-BUSS Output, is the Sum of the appropriate Signal Sources.
Jumper Options select the audio signals on each Block to be output.
For example, only the "Slave" input, usually the Operator Microphone, may be sent to the output,
which is normally the ceiling speaker in the procedure room.
