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10
CONNECTION TABLE
Terminal No.
Relay Connection
124
Common terminal for studio "A"
"On Air" and "On Audition" relays
125
Studio "A" "On Air" relay
123
Studio "A" "On Audition" relay
127
Common terminal for studio "B"
"On Air" and "On Audition" relays
126
Studio "B" "On Air" relay
128
Studio "B" "On Audition" relay
Connect the a -c supply to the signal lights through the
open contacts of the MI -11702 Relays so that the lights will
be on when the relays are energized.
Control Room On Air Relay
If the control room "On Air" light is to be used,
the following equipment will be required in addi-
tion to that listed above:
a. One MI -11702 Relay and Capacitor.
b. One mounting box (see figure 6).
c. One resistor, 180 ohms, 20 watts; RCA
Stock number 17666.
d. One "On Air" light.
(See Signal Lights and
Relays under Associated Equipment).
The relay should be mounted in a metal box as
specified in figure 6 and installed near the control
room. Conduits for the control room signal lights
are shown in figure 11. Relay energizing voltage is
supplied by the voltage drop across the 180 -ohm,
20 -watt resistor which is connected in series with
the high side of the relay supply circuit of the
MI -11301-B Power Supply (see figure 14).
Con-
nections should be made as follows:
a. Connect the high side of the relay supply
circuit from the MI -11301-B Power Supply to
terminal number 122
instead of
118 on the
Consolette.
b. Connect terminal 118 to terminal 121.
c. Connect the 180 -ohm, 20 -watt resistor and
0.5 mf capacitor across the control room "On
Air" relay.
d. Connect the control room "On Air" relay
to terminals 121 and 122 on the Consolette.
e. Connect the a -c supply of the Control Room
"On Air" light through the open terminals of the
MI -11702 relay (marked "A" in fig. 6) so that
the light will be on when the relay is on.
Announce Booth Speaker and Signal Light Relays
The Consolette has control terminals for the
Announce Booth speaker and "On Air" Signal light
relays but does not have terminals to supply d -c
energizing voltage for them. These relays may be
installed and energizing power obtained as de-
scribed below. The following equipment will be
required:
a. One MI -11702 Relay and Capacitor.
b. One MI -11703 Relay and Capacitor.
c. One Mounting Box (see figure 6).
d. Two 180 -ohm, 20 -watt resistors.
(RCA stock No. 17666).
e. Suitable light equipment.
To obtain energizing voltage, the relays are
connected in series with the high side of the relay
supply circuit from the MI -11301-B Power Supply.
The circuit may be connected as shown in figure 13
if the Announce Booth relays only are to be used.
If this
circuit
is used in conjunction with the
Control Room light relay as shown in figure 14,
connect terminal 76 to terminal 122 in addition to
the connections described under Control Room "On
Air" Relay and connect the Announce Booth relays
in series between terminal 18 of the MI -11301-B
Power Supply and terminal 122 of the Consolette
as shown in figure 14.
The 0.5 mf capacitors and the 15 -ohm, 5 -watt
resistors are included with the relay kits. Note that
connected for three -studio
operation before these relays are installed.
See
figure 13 for connections.
Console Signal Lights
Two plug buttons (one at either side of the meter )
are inserted in the front panel of the Consolette and
wiring is provided to permit the addition of two
signal lamp jacks. When these are used, signal
lights such as "Pre -Set" and "On Air" can be
operated from the master control room when the
Consolette is used in large studio installations.
Terminals 67, 68, 69, and 70 may be used for
external connections to the signal lamp jacks.
The following equipment is recommended:
a.
2 lamp jacks, RCA stock no. 26562.
b. 2 lamps, RCA stock no. 21332.
c.
1 lamp cap, green, RCA stock no. 17931.
d.
1 lamp cap, red, RCA stock no. 17930.
INSTANTANEOUS RECORDER
The RCA Type 72-C or 72-D Instantaneous Re-
corder, or the 73-B Deluxe Recorder may be used
with the Type 76-B2 or 76-B4 Consolette for
recording auditions, broadcasts, or other material.
Terminals 41 and 42, which must be bridged, are
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