User's Manual

VOLUME III, CHAPTER 2, IRU 600 INSTALLATION
ground-bar end. Torque the grounding post screw to 1.2-1.5 Nm (10-13 in-lbs).
l All bare conductors must be coated with an appropriate antioxidant
compound before crimp connectors are fitted.
l All unplated connectors, braided strap, and bus bars must be brought to a
bright finish and then coated with an antioxidant before they are connected.
This does not apply to tinned, solder-plated, or silver-plated connectors and
other plated connection surfaces – but all must be clean and free of
contaminants.
l All raceway fittings must be tightened to provide a permanent low-impedance
path.
Waveguide Connection
Connect ACU antenna port(s) to waveguide(s) using flexible waveguide.
For information on required waveguide flange, and recommended waveguide type,
refer to the following table.
Remove and discard any protective flange/port covers before installation.
Table 2-1. IRU 600 ACU Flange Data
Freq, GHz Flange Type Holes
Screw
Length
Wave-
guide
5.8/6 CPR 137 G 8 x #10-32 tapped holes 1/2" WR 137
The screw length assumes a flex twist mating flange thickness of 1/4”.
Power Supply
CAUTION:The DC power connector (D-Sub M/F 2W2) on high power
V1 and V2 RFUs can be shorted inadvertently if applied at an angle.
Always insert with correct alignment.
The DC power suppl y must be SELV compliant (maximum lim-
ited 60 Vdc).
For IRU 600 power consumption figures refer to Power Consumption and INU Load
Maximums on page 61.
For +24 Vdc operation one PCC supports a maximum three V1 or V2 RFUs, or a max-
imum two V3 RFUs.
IRU 600(v1) and IRU 600v2
For 5.8 GHz operation the high-power RFU is required. High power RFUs are pow-
ered over the IF cable from its INU/INUe, and additionally via a separate DC input
on the RFU front panel.
l The power connector (D-Sub M/F 2W2) and cable is identical to that used for
the INU.
54 AVIAT NETWORKS