QA_v3.pdf

N0017323QKN21

14 September 2023

N0017323QKN21 RFQ Q&A_v1

QUESTION:

In the Statement of Work dated 7/21/2023 under Attachment 2, line 2.1 it states:

QUOTE:

Attachment 2: Security and Work Restrictions

2.1 Security Clearance Requirements

All personnel working onsite on this project must have at a minimum a final SECRET clearance.

UNQUOTE

Neither the installation Technicians with (redacted), nor the anechoic VSWR testing Technicians of the 3rd party (redacted), will have SECRET clearance.

Is it possible to waive this requirement? If not, we will have to decline to submit a firm fixed proposal.

ANSWER:

The requirement can be waived for personnel that will be on-site for less than 1-week (VSWR

Testing Technician) [This short duration exception is called out in the SOW].

If the company can complete the demo of the chamber and re-installation of absorber and fix the doors in less than 1-week, NRL can waive the requirement completely (Install + VSWR test can take 2 weeks).

NRL has a secure building and must provide escorts for the duration of the project. NRL cannot provide multiple escorts for a multi-week project.

If the vendor comes back with a schedule that completes in under 2-weeks, and can’t meet the schedule, the penalty shall be the cost of escorts. NRL’s escort cost is $4K/day (2 people/day).

(End of RFQ Q&A_v1)

N0017323QKN21 RFQ Q&A_v2

QUESTION:

It appears there are no requirements for measurement system equipment in this project. Is there a separate RFP planned for equipment to be used in the refurbished chamber, or is the plan to reuse existing equipment?

N0017323QKN21

14 September 2023

ANSWER:

There is no measurement system planned for the chamber. It is being designed as a general purpose chamber in which NRL’s engineers will install temporary equipment/test fixtures as required for each individual project that makes use of the chamber. NRL has a complete suite of

RF test equipment that will be reused for each research project, so no additional assets are required.

(End of RFQ Q&A_v2)

N0017323QKN21 RFQ Q&A_v3

RFP Q&A_v3 located in the below subsequent pages.

N0017323QKN21 – Q&A – 13 September 2023

Question #1 – What size is the existing absorber on the floor, walls, and ceiling?

It is a combination of 12, 18, and 36” absorber – specifics below.

All Material is from Emerson and Cumming. Chamber was built in 1981

Mark Material QTY

A VHP-36-NRL 215

B WG-18-NRL 285

C VHP-18-NRL 46

D1 VHP-18FL-NRL 2’x3’ 9 D2 VHP-18FL-NRL 2’x4’ 7 D3 VHP-18FL-NRL, 2’-6-1/2”x3’ 1 D4 VHP-18FL-NRL, 2’-6-1/2”x 4’ 1 D5 VHP-18FL-NRL, 2’-4-1/2”x 3’ 1 D6 VHP-18FL-NRL, 2’-4-1/2”x 4’ 1 D7 VHP-18FL-NRL, 2’-0”x 3’-4-1/2” 1

E1 VHP-12-NRL, Built Up to 18” HGT, 2’x4’ (This is walk-on floor) 20

E2-E10 VHP-12-NRL, Built Up to 18” HGT, various, max size 2’x4’(this is walk-on) 14

F1 VHP-8FL-NRL, HGT to be field verified before MFG. 1’-11” x 4’ 4 F2 VHP-8FL-NRL, HGT to be field verified before MFG. 1’-11”x5’ 1 F3 VHP-8FL-NRL, HGT to be field verified before MFG., 1’-11”x3’ 1 F4 VHP-8FL-NRL, HGT to be field verified before MFG, 6-1/2”x4’ 2 F5 VHP-8FL-NRL, HGT to be field verified before MFG. 6-1/2”x5’ 2

G LS-NRL (Corner Block) 4-11/6”x 10-1/2”x48” 28 H LS-NRL, 4-11/6”x 10-1/2”x48” 4 J LS-NRL, 16”x 18”x24” 10 K, L, M LS-NRL – Custom Sizes to fit around structures and in corners max – 6”x16”x

48”

N LS-NRL, 4”x21”x24” 22

Eccobond 87H(NR) 70 Gal

Fig 1 – Floor

Fig 2 – Ceiling

Fig 3- North Wall

Fig 4 – South Wall

Fig 5 – West Wall Fig 6 – Movable East Wall

Question #2 – Is the existing absorber installed with adhesive or mechanical clip and rail?

Adhesive (Eccobond 87H)

Question #3 – What size is this air vent in the north wall of the anechoic chamber?

Drawing shows ~ 8” x 12”(might be 6”x10”), it’s almost visible in Fig 3 West Light. The air vent is to the left and slightly above the light shown in the photo recessed in the notched out absorber.

Question #4 – Would a new replacement pneumatic door with a clear opening size of 1200mm x 2100mm (~4’ x 7’) be acceptable?

No, as shown in the West wall photo(Fig 1) the door outline can be seen to the right of the person. It is approximately 8’ tall and 3’-2” wide. Access to the chamber from the west control room involves stepping down into the chamber by 17”(and there is a set of retractable stairs). Reducing the height of the door by 12” would mean the door is under 6’ tall in the control room. In addition, the entry is framed in tubular steel and would require welding to modify. Going to 4’ wide would impinge on the chambers quiet zone as well.

The pneumatic system will automatically move the door from open to closed. We move the door now just by pushing/pulling on the door. There are no RF fingers to worry about, just the friction fit of the door absorber to the fixed absorber on the wall as seen in the photo.

The actual door moves using a steel cable and pulleys that has become frayed. It slides in tracks similar to the manual door. Both sets of tracks probably just need to be cleaned and greased. It would be acceptable to replace the pneumatic system with an electric motor.

The floor absorber that fits around the door tracks are pieces F1-F5

Question #5 – is the RF shielded enclosure constructed of RF welded plate steel, or of modular wood core panels?

RF Welded plate steel

Question #6 – What is the design of the RF seal on this sliding door on tracks that has to be repaired?

Can you supply a description and photos?

There is no seal. It is friction fit absorber. The RF seal is on the hallway door used to gain access to the east control room. Absorber F1 fits between the tracks and is held to the steel plate floor with Velcro.

You can see the outline of the door to the left of the bright blue absorber in Fig 2 East Wall.

The floor absorber that fits around the door tracks are pieces F1-F5

The actual RF perimeter seal of the chamber includes both control rooms and the chamber. From an RF seal perspective, room A+B+C is treated as one big room. The RF Doors from the hallway that provide the RF seal as well as entry into Rooms A&C are beyond the scope of this contract.

Question #7 – Does the contractor have to remove and dispose of the existing walk-on absorber of the East Control Room and replace it with new walk-on absorber? If so, what size is this walk-on absorber?

Yes, this is the absorber identified as E1 in the list above. Total area in the East control room approx. 8’ x 17’-1”.