Statement Of Work (SOW) for the Alignment of Parabolic Antenna Assembly of the Unmanned Threat Emitter (UMTE) AN/TPT-T1(V) PN: EMM333 NSN: 5985-01-540-8590 1.0
PURPOSE AND APPLICATION 1.1
2.0
APPLICABLE DOCUMENTS 2.1 2.2
3.0
DRS Requirements Document SP1026-5900 DRS Mechanical Drawing 1026-5900
MATERIALS AND EQUIPMENT 3.1
4.0
The purpose of this SOW is to define the materials, methods, acceptance standards, and delivery of the UMTE Parabolic Antenna and mounting hardware. P/N: EMM333, NSN: 5985-01-540-8590
As defined within this SOW or related specifications referenced within testing parameters.
EVALUATION 4.1
The vendor will remove assembly from packing and perform a visual and mechanical inspection to determine reparability. Inspections shall include as applicable and as a minimal, check for the following discrepancies: A. Loose, damaged, and/or missing hardware B. Bent, sprung, and/or damaged unserviceable mounting brackets C. Damaged mounting holes D. Damaged waveguides, and/or flanges E. Broken and/or cracked welds F. Dents or any other damage to parabolic antenna G. Damage to antenna feeds H. Paint scratches and/or paint flaking NOTE: If item needs to be repainted then verify paint color required with representative from Tobyhanna Army Depot.
4.2
The vendor will perform a repair cost evaluation after the visual inspection and notify Tobyhanna Army Depot with repair estimate that includes the asset being returned to Condition Code “A”. Condition Code “A” is defined as a new or refurbished to a like-new condition item.
NOTE: If it is to be determined that the refurbishment is beyond the scope of economic repair, the vendor will notify Tobyhanna Army Depot. Tobyhanna Army Depot will then advise the vendor of deposition at that time. Beyond scope of economic repair is defined as 70% of a new cost for P/N:EMM333. 5.0
ANTENNA PRE-ALIGNMENT PREPARATION 5.1 The vendor will repair any mechanical damage to the antenna assembly and replace any missing parts. Dents in the parabola shall be filled in with a conductive filler that will not depreciate antenna performance. Use the Parts, Materials, and Processes (Section 3.3.1) of DRS requirements document SP1026-5900 as a guideline for work standards. 5.2 Antenna assembly paint shall be re-touched or re-coated as necessary to give the antenna assembly an “A” condition appearance. Use paint specified by Tobyhanna Army Depot. 5.3 All stenciling and markings shall be legible conform to DRS mechanical drawing 1026-5900. 5.4 Waveguide assemblies shall be inspected for corrosion and pressure testing in accordance with the waveguide pressure leakage specification outlined in Table 1 “Performance Characteristics” of specifications document SP10265900. 5.5 Repair waveguides as needed. 5.6 Inspect antenna waveguide feed for damage or corrosion. Repair or replace as needed. 5.7 Waveguide assembly shall be VSWR tested after any repairs. If tested as an assembly on the antenna with feed connected the VSWR shall meet the Band A and Band B requirements as outlined in Table 1 “Performance Characteristics” of specifications document SP1026-5900.
6.0
Antenna Alignment 6.1
6.2
6.3
6.4
Verify that all antenna assembly mechanical dimensions meet those outlined in mechanical drawing 1026-5900. Note that both antenna beams, Bands A and B, must be orthogonal to the antenna mounting plate plane. Verify antenna performance in both frequency bands using a planar near field antenna range. Antenna assembly shall meet all gain, side lobe level, AL and EL beam widths, polarization, and VSWR requirements outlined in Table 1 “Performance Characteristics”. The Band A and B shall overlap as shown in Figure 1 “Beam Orientation” in specifications document SP1026-5900. Test frequencies documented on test results sent back to TYAD shall, at a minimum, show lowest frequency (FLO), middle frequency (FMID), and highest frequency (FHI) as given in Table 1 “Performance Characteristics”. Ensure that any drain holes or weep holes are pointed towards the bottom of the antenna to prevent water intrusion issues when system is on-site.
6.5
7.0
The mechanical antenna boresight mount shall be aligned orthogonal to the antenna mounting plate and parallel to the line intersecting the antenna beam peak. Alignment shall be accomplished as per the illustration shown in Figure A below.
QUALITY REQUIREMENTS 7.1 7.2
The vendor will supply Tobyhanna Army Depot with test and alignment data verifying that assembly passed all parameters outlined in the statement of work. Antenna electrical data shall, at a minimum, include for Bands A and B at FLO, FMID, and FHI: 1) VSWR looking into waveguide inputs of fully assembly antenna system 2) Antenna pattern gain 3) Antenna pattern maximum sidelobe levels in both AZ and EL planes 4) Antenna pattern beamwidths in both AZ and AL plans 5) Angle difference between Band A and Band B beam peaks
6)
7.3
7.4 7.5
7.6
7.7
Measured antenna pattern plots in AZ and AL plane cuts. The amplitude data shall be expressed in decibels and angle data in degrees. All antenna pattern plots shall be normalized to amplitude of 0dB. 7) Raw data for AZ and EL plane cuts. Antenna mechanical data shall include the following: 1) Degree error of antenna mounting plate plane from plane orthogonal to antenna beam patterns. Error will be defined in both AZ and EL planes. 2) Degree error of antenna optical line of sight (boresight telescope) from antenna electrical line of sight (antenna beam peaks). Upon return to Tobyhanna Army Depot, assembly MUST pass Tobyhanna Army Depot’s operational testing procedures. If any portion of overhaul and alignment of antenna does not meet the specifications outlined in either this Statement of Work or DRS specifications document SP1026-5900 and cannot be readily repaired the vendor shall confer with Tobyhanna Army Depot Engineering to determine path forward. If any portion of overhaul and alignment of antenna does not meet the specifications outlined in either this Statement of Work or DRS specifications document SP1026-5900 the vendor shall provide any historical data available to Tobyhanna Army Depot Engineering to determine if asset ever passed failed specification. Alignment of the Parabolic Antenna P/N:EMM333 is to conform to all requirements stated within the Statement of Work. --END OF DOCUMENT--