Radio Systems Millenium-A Console Page 21
nel input. The only exception is that a special IAD (factory provided as part # “AT-M”) is utilized to increase the input
sensitivity any time a mic is used.
Five standard IAD’s are provided by the factory. These include the one for use with mics, and four standard values of
input attenuation. Illustration C-3 charts which IAD should be utilized under different source level combination situations,
and shows the parts values any construction of the IAD’s.
3.3 Patch Point Connections
3.3.1 Pre-Fader, Pre-On/Off Patch Point
An unbalanced pre-fader stereo loop-thru is provided at the insert point on header J8. The nominal level at this point is
typically between -6dBv and +ldBv. The Send output impedance is 400 ohms, and the Return input impedance is 20K
ohms.
The patch point maybe used two different ways. The rst application is to insert a piece of processing gear into the
audio chain. In this instance, the patch point bypass jumpers, which are installed on header J7 (positions A and C) must
be removed.
Input and output loop-thru connections are made using a 5 pin quick connector installed at the patch point header J8.
Refer to Illustration C-1 (for 5-pin version consoles) or Illustration C-2 (for RJ-45 version consoles) for pin-outs.
Single conductor shielded cable, or two conductor shielded cable with a foil shield around each conductor should be
used for patch point connections. The shield should be tied to ground at both the console and at the external gear. In
addition the external gear should:
1. operate at unity gain
2. have a bridging input and present a load of 2K ohms or greater to the output of the input amplier
3. have an low output impedance of lK ohms or less
If mono operation is desired, wire the output from the external gear to both the left and right return connector positions.
In this application, the output from external gear will see a 10K load from the console.
The second application of the patch point is for a parallel feed off of the input amplier. An example would be to feed
the microphone channel into the talk back circuitry. In this application, jumpers A and C should be in place on header J7
and all wiring to J8 should be made to pins 2 (left), 4 (right), and 3 (ground).
The optional DA card can be used to balance and isolate the patch point sends and receivers in either the loop-thru or
parallel feed applications. Consult the Interface Options and Accessories Section of the manual for more information.
3.3.2 Post- Fader, Pre-On/Off Patch Point
For consoles produced after September, 2008, there also is an unbalanced post-fader, pre-on/off audio patch point con-
nector available. The mating connector for this patch point is not provided in the console startup kit. Contact the factory
for availability and pricing. A ten foot connectorized pigtail is available from the factory to utilize this patch point; the P/N
is 16867.
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