Technical information

OM93_Rev H Page 12 of 28
2.0 Mount & Antenna Assembly Procedures
These sections provide the basic sequence and tips for the assembly of various elements of the 9.3m ESA.
Appropriate drawings and schematics references for assembly of the antenna are also provided, when
applicable. Refer to the drawings, instructions, and schematics for the specific system being installed, per the
information provided in Table 1.2.
2.1 Assembly Sequence & Helpful Tips
ASC Signal recommends following these helpful tips regarding the sequence of assembly:
Always use the correct provided hardware and use the appropriate sequence for tightening/torque, as per
the instructions provided with the part or kit being assembled and/or installed (as listed in Table 1.2).
As a rule, never fully tighten A-325 type hardware (see Section 1.2) unless instructed to do so by
instructions. Once tightened, A-325 cannot be loosened. If loosened, it must be replaced with new A-325
hardware.
The Mount should be assembled at ground level before beginning any hoisting with crane.
The Reflector & Back Structure should be assembled at ground level before beginning any hoisting with
crane.
Theodolite Alignment should be performed at ground level before beginning any hoisting with crane.
During assembly of the Azimuth Jackscrew, ensure that the Azimuth Jackscrew assembly is in the fully
retracted position.
During hoisting (with crane) of the Motor/Jack Assembly, do NOT attach any ropes to the Small Motor.
Always attach hoisting ropes in such a way that moving parts will not drop/rotate when lifted.
Realignment of the Panning Frame/Pivot Assembly may be necessary to ensure proper alignment of the
Azimuth Jackscrew pin. Make snug the Panning Frame/Pivot Assembly hardware and fully extend the
Azimuth Jackscrew so that binding does not occur along the full range of the Azimuth Pivot.
The following steps represent the recommended (but not required) basic sequence of assembly for this
antenna:
NOTE: More steps may be required, in addition to those listed below, depending on the antenna type and/or the presence
of particular options. Refer to Table 1.2 to locate document numbers for the system being installed. Such documents will
be provided in the shipment of each part, kit, and/or option.
1. Mount Assembly: Refer to instructions per document 37745D
2. Reflector & Back Structure Assembly: Refer to instructions per document 237242
3. Theodolite & Alignment: Refer to instructions per document 237242
4. Feed Rotation Drive Installation: Refer to instructions per document 239954
5. Subreflector Assembly & Installation: Refer to instructions per document 237242
2.2 General Subreflector Alignment Guidelines
The primary goal of Subreflector alignment is for the Subreflector to be properly centered and for the height to
be adjusted to the correct focal length for the antenna.
Keep the following guidelines in mind during Subreflector alignment:
A tape measure is generally used in order to center the Subreflector
Measure from a repeatable location, running the tape measure from the 4 locations where the strut ends
meet the main reflector to the inside edge of the Subreflector
For centering measurements, a zero delta between all is ideal
Focal length is measured from the antenna vertex to the edge of the Subreflector at the three Adjustment
Rod locations on the Subreflector
Target focal length distance is determined by antenna type
Normally, the process of centering the Subreflector then the Subreflector height is repeated until both
centering and height are “nuts on” precise