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PART fl
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OPERATION
8.
GENERAL DESCRIPTION
Refer to Block Diagram, Figure 15.
This is a typical setup for use in a small station, to handle
two studios from a single control room.
The equipment can be used, of course, for single studio oper-
ation in larger stations.
A total of 6 mixer controls are provided in a group near the base of the sloping control panel.
The first two of these are associated with the two microphones in Studio "A", the second two with Studio
"B", and the last two with two sets of push keys for selecting any two of six remote lines or two
transcription inputs.
Ahead of the four microphone mixers are four pre -amplifier stages which amplify the outputs of the
four studio microphones.
A switch on the input of the fourth pre -amplifier allows switching to a fifth
microphone which may be used as an announce microphone, in the control room, or a sixth remote micro-
phone at some other point (such as a transcription booth).
The two sets of push keys ahead of the fifth and sixth mixers are used with two line transformers
and resistor attenuating networks in such a manner that both the remote lines and the transcription
turntables are properly terminated and matched to the mixing pads.
Each set of push keys consist of
nine buttons interlocked so that only one button is used at a time.
Six buttons can be connected to
six incoming remote lines, two to transcription turntables, and the final button is an "OFF" button.
The two sets of push keys are electrically interlocked so that a single incoming remote signal or a
single transcription output cannot be placed on both mixers.
#5 mixer and associated push keys have
priority over #6.
The output of the six mixers feeds (through mixing resistors) into six program -audition switches.
'When these switches are in the normal position, the outputs of the mixers are open while loading re-
sistors are placed across both the program and audition busses.
When a program -audition switch is thrown to the program position, the output of a corresponding
mixer is placed on the program bus.
Likewise, when a switch is thrown to the audition position, the
signal
is placed on the audition bus.
(A)
PROORAN CHANNEL
The program bus is connected to the input of the program amplifier, which consists of a
booster amplifier and a three -stage studio amplifier.
The 'MASTER" volume control is located
between the booster and the studio amplifier.
After leaving the program amplifier, the signal passes to the "LINE-OUT" switch.
The
"LINE-OUT" switch has in addition to its normal
(or off) position a Regular and an Emergency
position.
When in the normal position, a load is placed across the output of ,the program
amplifier.
Across this circuit is the volume indicator.
When the "LINE-OUT" switch is in the "REGULAR" position, the output of the program amp-
lifier is fed into the outgoing line, with load removed and the volume indicator still across
the circuit.
The function of the "LINE-OUT" switch when in the emergency position is de-
scribed later.
A phone jack provides for headphone monitoring of the program channel with the Phone -Mon.
switch to "Prog."
(B)
AUDITION CHANNEL
The audition bus of the Type 76-82 Consolette is connected to one of the buttons of a set
of push keys at the input of the monitor amplifier.
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