User's Manual

5-4 Aviat Networks
Chapter 5. Installing the IRU 600
• 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.
• All raceway fittings must be tightened to provide a permanent low-impedance path.
Connect Waveguide(s) to Antenna Ports(s)
Connect the ACU antenna port(s) to the main waveguide(s) using appropriate lengths
of flexible waveguide.
For information on required waveguide flange, and recommended waveguide type, see
below.
Remove and discard any protective flange/port covers before installation.
Figure 5-3. ACU and Waveguide Connection
Table 5-1. Waveguide Flange Type
Power Supply
The high power RFUs used at 5.8 GHz are powered over the IF cable from its INU/
INUe and additionally from a DC input on the RFU front panel.
• The high power RFU provides a wide-mouth connection for +/- 21 to 60 Vdc. Both
+ve and -ve pins are isolated from chassis ground.
• The power connector (D-Sub M/F 2W2) and cable is identical to that used for the
INU. See Power Cables.
• Run the supplied power cable through to the power pick up point, which should
be protected by a circuit breaker or fuse in the rack. The circuit breaker or fuse
should have maximum capacity of 8 A.
Freq, GHz Flange Type Holes Waveguide
5.8 / 6 CPR 137 G All open for # 6-32 screws WR 137