Supplemental Info.pdf

Supplemental Info

1. Model numbers for the antennas that are being removed and relocated cannot be provided.

2. The longest cable run would be ~400 feet. The other two ~350 feet.

3. Transmission cable brand and size: LMR-600 or ½ inch Heliax.

4. The Government will not be supplying materials including antenna, connectors, cabling, cable supports, mounts, etc. Contractor is to provide two (2) of the three (3) antennas.

NASA will supply the third antenna.

5. The antenna centerlines are right and left of Gantry Center Bent.

6. Photos of previous installation below.

7. Location of the antennas are on top of the Gantry Center Bent.

8. There is no conduit between the floors.

9. There is no drywall or drop ceiling in the area of operation.

10. Antennas are not tower or satellite communications antennas.

11. The Government has not purchased the replacement antennas.

12. There is an onsite location to dispose of old antennas.

13. Antennas are not motorized.

14. Cables do not need to be run through conduit.

15. Cables required for the installation of the new terminals have not been purchased.

16. Height above ground of the 4th level of the Gantry is ~300 feet.

17. Stairs and Elevator are available at the Gantry for the contractor to access the 4th level.

18. Elevator interior dimensions and door opening dimension: 7 foot tall and will handle up to 6 individuals at one time.

19. All three antennas are located on the center bent south side.

20. At each existing antenna location: a) antennas are not reachable with the contractor standing flat-footed on the 4th level walkway, b) the antenna is to be mounted ~ 10 feet above the walkway, c) contractor could possibly require ladder or other to reach antenna, d) there are OSHA approved tie-o points (for worker fall protection) at each location

21. At each new antenna location: a) new antenna locations will be identified on the 4th level walkway, height above walkway at least 10 ft, b) mounting will be the same for all three antennas, c) secure round pipe (mast) to L-Shaped metal handrails (prefer stainless hardware), see photo of 4th level walkway below, d) there are OSHA approved tie-o points (for worker fall protection) at each new location, e) see B1297 Gantry Center Span Antenna Relocation 2025 attachment to provide at least 2 di erent angles of the three new antenna locations

22. Description of route of each new antenna cable: From the Comm shelter follow the existing route of other comm cables up to ~10 feet to the forth level where existing cables are run along a path to other antenna locations.

23. The new cable will run along existing cable path to each new location.

24. Secure new RF cable along the path as required: Such as 1/2inch cable stackable snap in type.

25. Type of connectors required to install on each cable: “”N male”” type connectors for the specific cable used.

26. Testing of each cable after installation to determine the integrity of the cable is valid (no cable damage) using a Time Domain Reflectometer (TDR) or equivalent.

27. “Test plan” for review and approval by NASA is not required.

28. Contractor’s personnel will need a safety briefing from the 1297 Facility Coordinator prior to entering the Center.

29. There is no electrical work involved, just RF Coax install.

30. Total quantity of antennas that are to be removed and replaced: Removal of three (3), Replacing three (3).

31. Contractor is to provide two (2) of the three (3) antennas. NASA will supply the third antenna.

B1297 Gantry Center Bent Antenna Removal & Relocation

29 November 2024

Key Points

• LaRC Spectrum Office Was Notified 21 August 2024 By The HLS Moon Landing Test (MLT) Project.

• MLT Will Be Installing New Hardware On The Gantry Center Bent.

• Existing Antennas & Weather Station Will Have To Be Removed/Relocated.

Key Points

• Three (3) Antennas Have Been Identified For Removal & Relocation:

– Two (2) Active LaRC Amateur Radio (UHF, VHF)

Repeater Antennas.

– One (1) Active Langley Air Force Civil Air Patrol

(CAP)Repeater Antenna.

Antennas In Question

2 3

1- LaRC Amateur Radio VHF Repeater 2- Langley Air Force Civil Air Patrol (CAP) VHF Repeater 3- LaRC Amateur Radio UHF Repeater

Center Bent

Relocation Areas

1- LaRC Amateur Radio VHF Repeater 2- Langley Air Force Civil Air Patrol (CAP) Repeater 3- LaRC Amateur Radio UHF Repeater

Center Bent

Conclusions

• MLT Project Will Pay For The Removal, New Cable &

Relocation Of Identified Antennas.

• Would Like To Preview The Removal & Installation Plan

Prior To Start Of Work.

• Antennas & Transmission Line To Be Installed By

Trained/Experience Personnel, Familiar With RF Industry Standards For Installation & Grounding.

• We Asked For At Least Two (2) Weeks Advance Notification Before The Removal & Relocation Work Is Performed.

• This Will Allow Us To Have New Antennas On Site.

• Antennas Identified To Be Removed & Relocated

Support Emergency Communication Operations.

• To Minimize Down Time We Recommend The Following:

• All Cables & Connectors Be Installed First Before Any Antenna Removal.

• Testing Of Each Cable Be Conducted To Verify Any Installation Faults.

• New Cable Runs From The Antenna To The Comm Room Located On The Third Level:

• Recommend Hardline Cable Or At A Minimum LMR600 Cable.

• Recommend UV Resistance Cable.

• Cables To Have “”N-Male”” Type Connectors On Each End.

• Cables To Be Labeled Appropriately.

• We Asked To Be Onsite The Day Work Is Started.

• To Allow Us To Power Off Equipment Associated With Each Antenna.

• To Allow Us To Performed Verification Of Antenna Performance With An Antenna Analyzer. If An Antenna Is Found To Be Defective A Replacement Antenna Will Be Available.

• Old Cables To Be Removed & Discarded.

• Before New Cables Are Reconnected To Equipment

Voltage Standing Wave Ratio (VSWR) Measurements Will Be Performed.

• Depending On When This Work Will Be Performed The Civil Air Patrol Has Noted: We our Winter Encampment coming up 27 December – 4 January so it would be best to avoid that timeframe.