Control Inputs - Crown PIP-RPA Reference Manual

P.I.P.-RPA
the signal ground is isolated from the
chassis ground by a 82-ohm resistor
and 0.1-microfarad capacitor as
shown below:
Fig. 3.13 Locating the
Ground Isolation Jumper
3.6 Wiring the Remote

Control Inputs

Each input has an attenuator which is
remote controlled and is located in
the circuit after the input mode, input
level control, and voice-over/duck-
ing circuitry. See Figure 3.19.
Fig. 3.14 Ground Isolation
The attenuator is a voltage-controlled
amplifier (VCA) which is operated by
a DC voltage range of 5 to 10 V. It has
zero attenuation when it receives 10
V. It has a maximum attenuation of
84 dB when it receives 5 V or less
(see Figure 3.15). If the VCA re-
ceives a voltage over 10 V, it will also
Reference Manual
switch to maximum attenuation. A
10-V source is provided on the PIP
module for your convenience, but an
external source can also be used.
A 10-Kohm, C-taper audio pot is sug-
gested for remote lines (see Appen-
dix A-1). Crown's RPA-RMT is ideal.
Linear pots will work, but are less
precise at higher output levels. Con-
nect the pot between the PIP's 10-V
output and the remote input (Figure
3.16).
Fig. 3.15 Remote Control
Resistance/Voltage
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