2.11.7 Initial Alignment (V4)
4. Insert gasket (167668-1) between transition and
Perform the initial inspections, checks and
rotary joint flanges and align flanges and gasket; secure
flanges using ten 1/4-inch stainless steel cap screws
(207-1161P10) and lock nuts (2031155P56).
2.12 RECEIVER TRANSMITTER RT-1241 (V4)
5. Tighten top nuts on each transition support cap
2.12.1 Mounting Hardware (V4)
screw to secure screws to pedestal housing.
When installing the receiver transmitter, the
6. Using not more than one-half turn increments,
following general rules must be observed as applicable:
alternately adjust two lower nuts on each cap screw to
1. Corrosion-resistant (i.e.
level the transition and rotary joint waveguide section
mounting hardware should be used.
and secure the transition.
2. Mating surfaces of dissimilar metals should be
coated with a silicone compound such as Dow Corning
transmission line, the waveguide may be connected
DC4 (Part Number 230-1014P3) to prevent corrosive
directly to the receiver transmitter flange, but not to the
pedestal flange. It is recommended that waveguide-to-
2.12.2 Mounting Instructions (V4)
cable-to-waveguide transitions be made at both the
The receiver transmitter assembly is fitted with
pedestal and receiver transmitter ends of the waveguide
two horizontal channel members to facilitate bulkhead
run to minimize the effect of vibration differentials along
mounting. Installation dimensions and clearances for
the run. The S-band waveguide flanges at both the
receiver transmitter and the antenna pedestal rotary
clearance is required on the right side to allow for
joint are CPR-284 rectangular type flanges.
the unit for cable entry. Allow 36 inches in front of the
interface (required at the pedestal, recommended at the
receiver transmitter for servicing and ventilation.
receiver transmitter), the waveguide run should be
brought to within approximately three feet of the
STARTING CAPACITOR C2 MUST BE
pedestal or receiver transmitter flange; two waveguide-
to-cable transitions (167175-1) and a short sections of
RECEIVER TRANSMITTER IF A
7/8-inch EIA foam dielectric RF coaxial cable (168856-1
or -2, with corresponding connectors 168857-1 or -2) are
SINGLE-PHASE DRIVE MOTOR IS
used to complete the interface. The RF cable center
USED IN THE S-BAND PEDESTAL.
probe dimensions specified above (for RF cable
2.12.3 Cable Connections (V4)
installations) must be observed at each waveguide-to-
Cable and waveguide connection data is
Access to terminal boards within the receiver
be used to secure the waveguide run to the mast and to
transmitter is provided by removing the wrap-around
the wheelhouse structure.
cover which is secured to the receiver transmitter
chassis assembly by four clamping catches. All receiver
WHEN A SINGLE-PHASE ANTENNA
transmitter interconnecting cables enter the receiver
transmitter through the bottom of the cabinet (see
DRIVE MOTOR IS USED IN THE S-
connectors which interface these cables, remove the
CAPACITOR MUST BE INSTALLED
IN THE RECEIVER TRANSMITTER
clamping catches. For access to the antenna drive
motor power cable connections at contactor K1, remove
the contactor cover plate on the exterior right-hand side
STARTING CAPACITOR INSTALLA-
of the receiver transmitter.
Ship's mains shall be connected to the receiver
2.11.6 Lubrication (V4)
transmitter through a 15-ampere fuse or circuit breaker
Check and, if necessary, lubricate the pedestal
box (with power disconnect switch).
(supplied in installation kit) at filler port.